JP5834345B2 - Aluminum alloy article, aluminum alloy member and manufacturing method thereof - Google Patents

Description

  The present invention relates to an aluminum and aluminum alloy article in which a resin is bonded to at least a part of a surface, an aluminum alloy member subjected to a surface treatment for coating a resin on at least a part of the surface, and a method for manufacturing the same. In particular, the present invention relates to an aluminum alloy article and an aluminum alloy member excellent in bonding strength between a resin and an aluminum alloy substrate, and a method for producing them.

  Aluminum and aluminum alloys are widely used as industrial materials because they are lightweight, have high specific strength, and are excellent in workability. An aluminum alloy article in which a resin is bonded to at least a part of the surface of the aluminum alloy substrate ensures excellent strength and rigidity that cannot be obtained by the resin molded product alone by the aluminum alloy substrate. It is possible to obtain complex shapes and aesthetics that cannot be formed, and it is used in many fields including the above-mentioned applications.

  Conventionally, a method of fixing a resin to an aluminum alloy substrate by providing a notch or a perforation in an aluminum alloy substrate in advance, and performing resin in-mold molding on the aluminum alloy substrate by, for example, injection molding. Is used.

  However, in this method, it is necessary to secure a place where a notch or a perforation is to be provided, and there is a problem that design restrictions are large, and a bonding force does not act between the resin and the substrate except for the notch or the perforated part. Therefore, there is a problem that a gap may be generated between the base and the resin. Therefore, in this method, since the aluminum alloy substrate and the resin are not completely integrated, the deformable resin portion may be easily deformed when a deformation stress is applied.

Therefore, as a method that does not require notches or perforations and can apply a bonding force over the entire bonding surface between the resin and the aluminum alloy substrate, for example, in Patent Document 1, the aluminum alloy substrate is immersed in a hydrazine aqueous solution or the like. An aluminum alloy article (a composite of an aluminum alloy and a resin) is disclosed in which a recess having a diameter of 30 to 300 nm is formed on the surface and then a thermoplastic resin containing polyphenylene sulfide is injection-molded on the surface of the aluminum alloy substrate.

  Further, for example, in Patent Document 2, the surface of an aluminum alloy substrate is washed with an organic solvent and an acid to remove stains and oxide films, and then subjected to a surface treatment with a triazine thiol solution using an organic solvent such as methanol or ethanol as a solvent. In addition, it is disclosed that a resin obtained by adding a rubber component or a triazine thiol as an additive to a metal substrate subjected to this surface treatment is integrally molded by injection molding.

JP 2009-6721 A JP-A-8-25409

  However, the method described in Patent Document 1 has a problem in that usable resins are limited because the resin to be used needs to contain polyphenylene sulfide.

  On the other hand, in the method of Patent Document 2, the surfaces of aluminum and aluminum alloy are oxidized very easily, and a dense oxide film is formed on the surface in a very short time. However, there is a problem that sufficient bonding strength cannot be obtained even if the surface treatment is performed with a triazine thiol solution.

  Accordingly, an object of the present invention is to provide an aluminum alloy article having an excellent bonding force between a resin and an aluminum alloy using an alkoxysilane-containing triazine thiol and a method for producing the same. Another object of the present invention is to provide an aluminum alloy member for bonding a resin to the surface and to provide a manufacturing method thereof.

  The present invention is an aluminum alloy article comprising a base made of aluminum or an aluminum alloy, and a resin bonded to at least a part of the surface of the base via a dehydrated silanol-containing triazine thiol derivative coating, the base and the dehydration Between the silanol-containing triazine thiol derivative coating, at least one selected from the group consisting of hydroxide, hydrated oxide, ammonium salt, carboxylate, phosphate, carbonate, silicate and fluoride An aluminum alloy article comprising a metal compound film.

  The present invention also relates to a method for producing an aluminum alloy article, wherein a resin is bonded to at least a part of a substrate made of aluminum or an aluminum alloy using an alkoxysilane-containing triazine thiol derivative, wherein water vapor, hydroxylation of a group I element is performed. Products, Group I element salts, Group II element hydroxides, Group II element salts, ammonia, ammonium salts, hydrazine, hydrazine derivatives, amines, phosphoric acid, phosphates, carbonates, carboxylic acids, carboxylic acids Using at least one aqueous solution selected from a salt, silicic acid, silicate, and fluoride, at least a part of the surface of the substrate is provided with hydroxide, hydrated oxide, ammonium salt, carboxylate, phosphoric acid Forming a metal compound film comprising at least one selected from the group consisting of a salt, carbonate, silicate and fluoride; The serial metal compound film, a manufacturing method which comprises a step of contacting the alkoxysilane-containing triazine thiol derivative, and a step of bonding the resin to the alkoxy silane moiety contacting the containing triazine thiol derivative.

  The present invention further includes a base made of aluminum or an aluminum alloy, and an aluminum alloy member in which at least a part of the surface of the base is coated with a dehydrated silanol-containing triazine thiol derivative or a silanol-containing triazine thiol derivative. Between the dehydrated silanol-containing triazine thiol derivative coating or the silanol-containing triazine thiol derivative coating, from hydroxide, hydrated oxide, ammonium salt, carboxylate, phosphate, carbonate, silicate and fluoride An aluminum alloy member comprising a metal compound film containing at least one selected from the group consisting of:

  The present invention is also a method for producing an aluminum alloy member in which an alkoxysilane-containing triazine thiol derivative is brought into contact with at least a part of a substrate made of aluminum or an aluminum alloy, which comprises water vapor or a hydroxide of a group I element, I Group element salt, Group II element hydroxide, Group II element salt, ammonia, ammonium salt, hydrazine, hydrazine derivatives, amines, phosphoric acid, phosphate, carbonate, carboxylic acid, carboxylate, silica Using at least one aqueous solution selected from acids, silicates and fluorides, at least a part of the surface of the substrate is coated with hydroxide, hydrated oxide, ammonium salt, carboxylate, phosphate, carbonate, Forming a metal compound film containing at least one selected from the group consisting of a salt, a silicate, and a fluoride, and the metal And a step of bringing the alkoxysilane-containing triazine thiol derivative into contact with the compound film.

  According to the present invention, a predetermined metal compound film is introduced on the surface of an aluminum alloy substrate, and a reactive functional group is formed on the surface of the metal compound film using an alkoxysilane-containing triazine thiol derivative (for example, an alkoxysilane-containing triazine thiol metal salt). To provide an aluminum alloy member capable of bonding a resin to the surface thereof with a high bonding force, an aluminum alloy article having a high bonding strength between the aluminum alloy substrate and the resin, and a method for producing the same Is possible.

It is sectional drawing of the aluminum alloy article which concerns on this invention. It is sectional drawing of the conventional aluminum alloy article.

  1 Aluminum alloy substrate, 2 metal compound film, 3 dehydrated silanol-containing triazine thiol derivative film, 4 resin

  When joining using an alkoxysilane-containing triazine thiol derivative that joins an aluminum alloy substrate and a resin, compared to the case of using a substrate made of another metal such as a copper alloy, the reason why a sufficiently high bonding force cannot be obtained, The inventors of the present invention have studied. As a result, it was found that there is a high possibility that it is caused by the oxide film on the surface of the aluminum alloy substrate.

  When a metal and a resin are bonded using an alkoxysilane-containing triazine thiol derivative, the alkoxysilane part chemically bonds to the metal, and a reactive functional group composed of the triazine thiol derivative part is introduced onto the metal surface. This functional group (triazine thiol derivative part) is chemically bonded to the resin, so that the dehydrating silanol-containing triazine thiol derivative (the result of the above-mentioned alkoxysilane part being chemically bonded to the metal is the result of the alkoxysilane-containing triazine thiol). The product can be chemically bonded via a product generated from the derivative, thereby making it possible to obtain a strong bonding force.

  Usually, the bond between the alkoxysilane group of the alkoxysilane-containing triazine thiol derivative and the metal is prepared by preparing a solution of the alkoxysilane-containing triazine thiol derivative, and immersing the metal in this solution to form a hydroxyl group (OH group) on the metal surface. This is performed by reacting an alkoxysilane group. For this reason, a method of removing an oxide film on the metal surface by plasma treatment or the like and introducing a hydroxyl group (OH group) into the metal surface is generally used.

  However, aluminum has a strong binding force with oxygen, and the oxide film formed on the surface of the aluminum alloy is dense and strong, so that OH groups are not sufficiently introduced, and the aluminum alloy and the alkoxysilane group It can be presumed that a sufficient number of bonds (density) cannot be obtained. Further, simply removing the oxide film makes it impossible to obtain a high bonding force because aluminum is immediately combined with oxygen in water or air to form a new oxide film.

Therefore, the present inventors surface-treated the aluminum alloy substrate, thereby reacting and binding to the alkoxysilane group on the surface of the aluminum alloy, hydroxide, hydrated oxide, ammonium salt, carboxylate, phosphoric acid. After forming a metal compound film containing at least one selected from the group consisting of a salt, carbonate, silicate, and fluoride, an aluminum silane-containing triazine thiol is used to dispose the aluminum alloy substrate and the surface thereof. The inventors have arrived at the invention described in the present application, which strongly bonds the resin.
Details of the present invention will be described below.

FIG. 1 is a cross-sectional view schematically showing a part of an aluminum alloy article according to the present invention, the whole of which is represented by 100. An aluminum alloy substrate 1 made of aluminum or an aluminum alloy and a resin layer 4 are bonded via a metal compound film 2 and a dehydrated silanol-containing triazine thiol derivative coating 3 which will be described in detail later.
FIG. 2 shows a cross section of a conventional aluminum alloy article 200 in which the aluminum alloy substrate 1 and the resin layer 4 are joined using the dehydrated silanol-containing triazine thiol derivative coating 3. The conventional aluminum alloy article 200 does not have the metal compound film 2.

The metal compound film 2 that is a feature of the aluminum alloy article 100 according to the present invention is selected from the group consisting of hydroxide, hydrated oxide, carboxylate, phosphate, carbonate, silicate, and fluoride. At least one.
A method for producing the aluminum alloy article 100 of the present invention in which the aluminum alloy substrate 1 and the resin 4 are strongly bonded by using the metal compound film 2 will be described in detail below.

1. Cleaning treatment The surface of the aluminum alloy substrate 1 becomes non-uniform due to segregation and oxide film generated in the manufacturing process, or the rolling oil, cutting oil, press oil, etc. used during the processing and molding are attached, or rusting occurs during transportation. , May get dirty due to fingerprints. For this reason, depending on the state of the surface of the aluminum alloy substrate 1, it is preferable to perform a cleaning process using an appropriate cleaning method.

  Cleaning methods include physical methods such as grinding, buffing, and shot blasting, for example, electrochemical methods in which electrolytic treatment is performed in an alkaline degreasing liquid and cleaning is performed using generated hydrogen and oxygen, alkaline and acidic methods. Further, a chemical method using a neutral solvent (cleaning agent) can be used.

  It is preferable to use a chemical cleaning method from the viewpoint of simplicity of operation and cost advantage. Cleaning agents used for chemical cleaning include acidic cleaning agents such as sulfuric acid-fluorine, sulfuric acid-phosphoric acid, sulfuric acid, sulfuric acid-oxalic acid, and nitric acid, sodium hydroxide, sodium carbonate, and sodium bicarbonate. Any industrially usable cleaning agent may be used, including alkaline cleaners, such as alkaline, boric acid-phosphoric acid, sodium phosphate, condensed phosphoric acid, fluoride, silicate. . Since it is inexpensive, has good operability, and does not roughen the surface of the aluminum alloy substrate 1, a weak alkaline aqueous solution (weak alkaline detergent) such as a condensed phosphoric acid type, a sodium phosphate type, or a sodium bicarbonate type is used. Is preferred.

  In the present invention, it is indispensable to form a desired metal compound film 2 on the surface of the aluminum alloy substrate 1 by a metal compound treatment after performing a surface roughening treatment as necessary following the cleaning treatment. It is. Therefore, in the cleaning process that is the previous process, the deposits on the surface of the aluminum alloy substrate 1 are removed, and the oxide film of aluminum and other metals on the substrate surface is removed to such an extent that the process in the next process is not hindered. In addition, it is preferable that the aluminum alloy substrate 1 is not excessively damaged due to dissolution or the like during cleaning, while being made uniform. For this reason, it is preferable to use a weak etching type such as sodium orthosilicate, sodium metasilicate, or sodium phosphate in which the aluminum alloy substrate 1 is slightly dissolved, and more preferably a non-etching type that does not dissolve the surface.

  As the non-etching type cleaning agent, it is preferable to use a cleaning agent mainly composed of condensed phosphate. As the condensed phosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate, and the like can be used. For example, the alkali component is 30 g / L (of which the condensed phosphate accounts for 50-60%). An aqueous solution having a pH of about 9.5 can be used. A good cleaning can be performed at a treatment temperature of 40 to 90 ° C. and a treatment time of about 5 to 20 minutes. After washing, wash with water. The preferred concentration of the alkali component is 20 to 100 g / L, more preferably 20 to 60 g / L, most preferably 20 to 40 g / L, the preferred pH is 9 to 12, and the preferred temperature is 40 ° C. to 60 ° C. By immersing the aluminum alloy substrate 1 in a weak alkaline aqueous solution that satisfies such conditions, the surface can be cleaned and made uniform.

In addition to the above, various phosphoric acids such as sodium orthosilicate, sodium silicate, sodium carbonate, sodium bicarbonate, sodium salt such as borax or primary sodium phosphate, secondary sodium phosphate, tertiary sodium phosphate Phosphate salts such as sodium and sodium hexametaphosphate may be used.

2. Roughening treatment As a pretreatment for the metal compound treatment described in detail later, it is preferable to roughen (roughen) the surface of the aluminum alloy substrate 1. When the surface of the aluminum alloy substrate 1 is roughened, the surfaces of the metal compound film 2 and the dehydrated silanol-containing triazine thiol derivative film 3 formed on the surface are also roughened to generate minute irregularities. And since the resin 4 to be joined enters the recesses on the surface of the dehydrated silanol-containing triazine thiol derivative coating 3, a so-called anchor effect is produced, and the joining strength can be further improved.

  One preferred method of roughening utilizes the properties of aluminum, an amphoteric metal, to treat the aluminum alloy substrate in an acidic or alkaline pH region where the aluminum alloy dissolves to roughen the surface. That is, it is brought into contact with an acidic solution having a pH of 2 or less, preferably pH 0 to 2, or an alkaline solution having a pH of 12 or more, preferably pH 12 to 14.

  It is preferable to use phosphoric acid, hydrochloric acid, sulfuric acid, nitric acid, sulfuric acid-hydrofluoric acid, sulfuric acid-phosphoric acid, sulfuric acid-oxalic acid, etc. for roughening in the acidic region at pH 2 or lower. For example, 10 to 20 g of hydrochloric acid is dissolved in 1 liter of water to adjust the pH to 1 or less, the aqueous hydrochloric acid solution is heated to a temperature of 40 ° C., the aluminum alloy substrate 1 is immersed for 0.5 to 2 minutes, and then washed with water. Sodium hydroxide, potassium hydroxide, ammonia, sodium carbonate, or the like is preferably used for roughening in the alkaline region at pH 12 or higher. For example, 10-20 g of sodium hydroxide is dissolved in 1 liter of water to a pH of 13 or higher, the aluminum alloy substrate 1 is immersed for 0.5-2 minutes at 40 ° C., and then washed with water. By these treatments, the arithmetic average roughness (surface roughness) Ra specified by Japanese Industrial Standard (JIS B0601: 2001) is preferably 0.1 to 0.6 μm. A more preferable surface roughness Ra is 0.1 to 0.4 μm.

  The aluminum alloy substrate 1 is made of aluminum or an aluminum alloy, and any aluminum alloy used in the industry can be used as the aluminum alloy. Examples of preferable aluminum alloys include: (1) As the alloy for extension, the 1000 series (pure aluminum series) and 2000 series (Al-Cu and Al-Cu-Mg) defined by the Japanese Industrial Standards (JIS) Series), 3000 series (Al-Mn series), 4000 series (Al-Si series), 5000 series (Al-Mg series), 6000 series (Al-Mg-Si series), 7000 series (Al -Zn-Mg series) and 8000 series (Al-Fe-Mn series). (2) As casting alloys, AC1A and AC1B (Al-Cu series), AC2A and AC2B (Al -Cu-Si system), AC3A (Al-Si system), AC4A and AC4C (Al-Si-Mg system), AC4D (Al-Si-Cu-Mg system), AC5A (Al-Cu-Ni-Mg system) , AC7A ( l-Mg system), AC8A and AC8B (Al-Si-Cu-Ni-Mg system), and AC9A and AC9B (Al-Si-Cu-Ni-Mg system) (3 die casting alloys are specified by JIS) ADC1 (Al-Si system), ADC3 (Al-Si-Mg system), ADC5 and ADC6 (Al-Mg system), and ADC10, ADC12 and ADC14 (Al-Si-Cu system).

  And the shape may be any shape including a plate shape such as a rolled plate, a tubular shape such as a pipe, and a cylindrical shape such as a wire.

3. Metal Compound Treatment After performing the above-described cleaning treatment and / or roughening treatment as necessary, the surface of the aluminum alloy substrate 1 is subjected to metal compound treatment (also referred to as “compound treatment”) to obtain a hydroxide. , A metal compound film 2 (also referred to as “compound film”) including at least one of hydrated oxide, ammonium salt, carboxylate, phosphate, silicate, and fluoride.
The metal compound treatment is performed by immersing in, for example, an aqueous solution of at least one of the following compounds and acids.

  The “metal” in the “metal compound coating” shown in this specification refers to the metal contained in the aluminum alloy substrate 1 and the metal contained in the solution (metal compound treatment liquid) used for the metal compound treatment shown in detail below. Means at least one of them.

  The metal compound treatment can be roughly divided into an alkali treatment using an alkaline solution and an acid treatment using an acidic solution. Details of each are shown below.

  The alkali treatment is performed by using a solution showing neutrality or alkalinity described in detail below, for example, by immersing in these solutions. In the alkali treatment, it is preferable to use an aqueous solution of a compound exhibiting neutral to weak alkalinity at pH 7-12.

  With the acid treatment, a metal compound treatment is performed by immersing in a solution having the acidity described below in detail, for example. In the acid treatment, it is preferable to use an aqueous solution of a compound exhibiting weak acidity of pH 2 to 5.

That is, in the case of an aqueous solution at 25 ° C., since aluminum forms a stable oxide passive film at pH 4 to 8, formation of a metal compound film may be difficult, and pH 2 to 4 and pH 8 to 12 may occur. In the range, the metal compound is dissolved on the aluminum alloy substrate by the dissolution of aluminum gradually and insolubilization by exchange reaction between the generated aluminum ions and the compound in the solution or by insolubilization of the compound due to pH change in the vicinity of the aluminum alloy substrate by dissolution of aluminum. The metal compound film can be easily formed. Considering that the treatment liquid temperature may be 40 ° C. or higher for reasons such as shortening the treatment time, the practical and preferable pH ranges are the above pH 2-5 (acid treatment) and pH 7-12 (alkali treatment). ). The range of the roughening treatment at pH 2 or lower and the pH 12 or higher applied to the roughening treatment is a preferable range for the metal compound treatment because the dissolution rate of the aluminum alloy substrate is high and the formation of the metal compound film may be difficult. is not.
The alkali treatment and the acid treatment will be described with reference to the solutions specifically used below.

3-1. Alkali treatment The metal compound treatment can be performed by immersing the aluminum alloy substrate 1 in a metal compound treatment solution (an aqueous solution of an alkali compound) used for the alkali treatment.

(1) Group I element hydroxide, Group I element salt, Group II element hydroxide, Group II element salt Group I elements such as lithium, sodium, potassium, rubidium or cesium (in the periodic table) Group I element hydroxides; Group I element salts; Group II elements (group II elements in the periodic table) such as beryllium, magnesium, calcium, strontium, barium or radium hydroxide and group II An aqueous solution of an elemental salt can be used. By using any of these, the metal compound film 2 mainly composed of hydroxide is formed on the surface of the aluminum alloy substrate 1. Examples of the hydroxide that is the main component of the metal compound film 2 include aluminum hydroxide and metal hydroxide (wherein the metal is a metal contained in the aluminum alloy substrate 1).

The group I element hydroxide, group I element salt, group II element hydroxide and group II element salt used in the metal compound treatment are shown in more detail.
Examples of group I element hydroxides include sodium hydroxide and potassium hydroxide. For example, when the metal compound treatment is performed using an aqueous solution of sodium hydroxide, the treatment is preferably performed at a sodium hydroxide concentration of 0.04 to 0.4 g / L and a temperature of 30 to 80 ° C.

  The salt of a group I element is a salt produced by a group I element and an acid, and an aqueous solution of the salt is a metal salt exhibiting alkalinity. It is a salt produced mainly by combining a weak acid and a group I element. Examples of such a group I element salt include sodium orthosilicate, sodium metasilicate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, Examples include sodium acetate, potassium acetate, sodium laurate, potassium laurate, sodium palmitate, potassium palmitate, sodium stearate, and potassium stearate. For example, when the metal compound treatment is performed using an aqueous solution of potassium carbonate, the treatment is preferably performed at a potassium carbonate concentration of 0.05 to 15 g / L and a temperature of 30 to 80 ° C.

Examples of Group II element hydroxides include calcium hydroxide and barium hydroxide. For example, when the metal compound treatment is performed using an aqueous solution of barium hydroxide octahydrate, the treatment is preferably performed at a concentration of barium hydroxide octahydrate of 0.05 to 5 g / L and a temperature of 30 to 80 ° C. .
Further, the salt of a group II element is a salt generated by a group II element and a weak acid, and a metal salt whose aqueous solution shows alkalinity. The salt is mainly formed by combining a weak acid and a Group II element. Examples of the Group II element salt include calcium acetate, strontium acetate, and barium acetate. For example, when the metal compound treatment is performed using an aqueous solution of barium acetate, the treatment is preferably performed at a barium acetate concentration of 0.05 to 100 g / L and a temperature of 30 to 80 ° C.

  For example, when a metal compound treatment is performed using an aqueous solution of a silicate of a group I element such as sodium orthosilicate, sodium metasilicate, potassium silicate, etc. as a salt of a group I element and a salt of a group II element The formed metal compound film 2 often contains silicate as a main component in addition to hydroxide. Examples of such silicates include aluminum silicate and metal silicate (metal is a metal contained in the aluminum alloy substrate 1). For example, when the metal compound treatment is performed using an aqueous solution of sodium orthosilicate, the concentration of sodium orthosilicate is preferably 0.05 to 1 g / L and the temperature is preferably 30 to 80 ° C.

(2) Ammonia, hydrazine, hydrazine derivatives or water-soluble amine compounds Aqueous solutions of ammonia, hydrazine, hydrazine derivatives or water-soluble amine compounds are also alkaline. Even if the aluminum alloy substrate 1 is immersed in these aqueous solutions, a metal compound film can be formed. On the surface of the aluminum alloy substrate 1, a metal compound film 2 mainly composed of hydroxide such as aluminum hydroxide or metal hydroxide (metal is a metal contained in the aluminum alloy substrate 1) is generated. Ammonia, hydrazine, hydrazine derivatives, and water-soluble amines are amine compounds in a broad sense. Other than ammonia and hydrazine, hydrazine, hydrazine carbonate and the like as hydrazine derivatives, methylamine, dimethylamine, trimethylamine as water-soluble amines, Ethylamine, diethylamine, triethylamine, ethanolamine, diethanolamine, triethanolamine, ethylenediamine, allylamine and the like can be used. For example, when the metal compound treatment is performed using an aqueous solution of hydrazine, it is preferable that the concentration of hydrazine is 0.5 to 100 g / L and the temperature is 30 to 80 ° C.

“(1) Group I element hydroxides, Group I element salts, Group II element hydroxides, Group II element salts” and “(2) Ammonia, hydrazine, hydrazine derivatives or water-solubility described above. Specific examples of “amine compounds” include carbonates such as sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate. By performing a metal compound treatment using an aqueous solution of these carbonates, a metal compound film 2 mainly composed of these carbonates, bicarbonates and / or hydroxides is formed on the surface of the aluminum alloy substrate 1. The These carbonates, bicarbonates and / or hydroxides may contain aluminum carbonate and / or metal carbonate (metal is a metal contained in the aluminum alloy substrate 1). Moreover, you may form several carbonate other than the carbonate of a metal contained in aluminum carbonate and the aluminum alloy base | substrate 1 by performing a metal compound process in the solution which mixed the carbonate of the metal from which a kind differs.
For example, when the metal compound treatment is performed using an aqueous solution of sodium carbonate, the aqueous solution preferably has a sodium carbonate concentration of 0.05 to 10 g / L and a temperature of 30 to 90 ° C.

(3) Boehmite treatment Metal compound treatment can be performed by boehmite treatment using a boehmite treatment solution.
Boehmite treatment refers to (1) weakly alkaline (pH 7 to 12 (preferably less than 12)) aqueous solution (boehmite) such as water (pure water) or 0.3% triethanolamine aqueous solution or 0.3% ammonia aqueous solution. (Treatment liquid) is heated to 50 ° C. or higher (preferably 80 ° C. or higher), and the aluminum alloy substrate 1 is immersed in the heated water or weakly aliquotous aqueous solution, or (2) exposed to the aluminum alloy substrate 1 in pressurized steam. It is processing to do.
When pure water or water vapor is used as the metal compound treatment liquid, the metal compound treatment liquid is neutral and is not strictly an alkali treatment. However, in this specification, it is described in the item of “alkali treatment” for convenience.
In addition, it is preferable that the metal compound processing liquid used for a boehmite process is weak antariness, in order that reaction may be a hydration reaction and a hydroxyl group may be formed efficiently.

By performing the boehmite treatment, a compound film 2 mainly composed of aluminum and a metal hydrated oxide (hydrate) contained in the aluminum alloy substrate 1 is formed on the surface of the aluminum alloy substrate 1. In many cases, the boehmite film formed by this boehmite treatment is a non-porous film mainly composed of γ-AlO · OH or γ-AlO · OH and α-Al ₂ O ₃ . By boehmite treatment, a relatively uniform metal compound film 2 having a film thickness of 0.02 to 10 μm, more preferably 0.05 to 2 μm can be formed.

  Thus, the boehmite treatment can form a metal compound film containing γ-AlO.OH as a main component, that is, the surface of the aluminum base can be formed densely and uniformly, and many fine irregularities are formed on the surface. This increases the contact surface area, which is effective for improving the bonding strength and is preferable as the metal compound treatment according to the present invention.

Preferred conditions for boehmite treatment are as follows.
A boehmite treatment solution is used in which at least one of ammonia, an amine, an alcohol amine, and an amide-based substance is added to pure water as an additive, and the pH is adjusted to about 10 to 12. An example of a preferred boehmite treatment solution is a 3 g / L aqueous triethylamine solution, and its pH is about 10. Processing temperature becomes like this. Preferably it is the range of 50-100 degreeC, More preferably, it is 80-100 degreeC, More preferably, it is 90-100 degreeC. Within this range, a dense metal compound film can be obtained in a relatively short time. The treatment time is preferably 1 to 120 minutes. The thickness of the film to be formed is about 0.02 to 10 μm.

3-2. Acid treatment

Specific examples of the metal compound treatment liquid used for the acid treatment are shown below.
(1) Phosphoric acid, phosphate Phosphoric acid, metal hydrogen phosphate such as zinc hydrogen phosphate, manganese hydrogen phosphate, calcium hydrogen phosphate, metal dihydrogen phosphate such as calcium dihydrogen phosphate salts and, for example zinc phosphate, manganese phosphate, calcium phosphate, sodium calcium phosphate, _-H 2 _PO 4, such as phosphoric acid metal salts such as zirconium phosphate, phosphoric acid and phosphate containing -HPO ₄ or -PO ₄ The metal compound treatment is performed using a salt solution. In this specification, phosphoric acid is a broadly defined acidic phosphoric acid including orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid, etc., and a phosphate is a broadly acidic acid such as orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid, etc. It is a concept including a compound of phosphoric acid.

  By using phosphoric acid, the metal compound film 2 mainly composed of aluminum phosphate and / or metal phosphate and / or hydroxide is formed on the surface of the aluminum alloy substrate 1.

  Meanwhile, zinc phosphate, zinc hydrogen phosphate, manganese phosphate, manganese hydrogen phosphate, metal hydrogen phosphate, metal dihydrogen phosphate, metal phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, calcium phosphate By performing a metal compound treatment using an aqueous solution of a phosphate (metal salt of phosphoric acid) such as sodium calcium phosphate, zirconium phosphate, vanadium phosphate, and zirconium vanadium phosphate, A metal compound film 2 mainly composed of these phosphates and / or hydroxides can be formed. These phosphate and / or hydroxide metal compound film 2 may contain aluminum phosphate and / or metal phosphate metal other than aluminum contained in aluminum alloy substrate 1. Moreover, you may form a some phosphate by performing a metal compound process in the solution which mixed the phosphate of the metal from which a kind differs.

  For example, when the metal compound treatment is performed using an aqueous solution of zirconium phosphate, the aqueous solution preferably has a concentration of 1 to 100 g / L and a temperature of 20 to 90 ° C. Other than this, phosphoric acid, zinc phosphate, zinc hydrogen phosphate, manganese phosphate, manganese hydrogen phosphate, hydrogen phosphate metal salt, dihydrogen phosphate metal salt, metal phosphate phosphate, calcium hydrogen phosphate, phosphorus When using an aqueous solution of phosphoric acid and phosphate such as calcium dihydrogen phosphate and calcium phosphate, the aqueous solution preferably has a concentration of 5 to 30 g / L and a temperature of 20 to 90 ° C. It is more preferable that the temperature is from 75C to 75C. On the other hand, when an aqueous solution of zirconium phosphate, vanadium phosphate, or zirconium vanadium phosphate is used, the aqueous solution preferably has a concentration of 0.2 to 2 g / L and a temperature of 30 to 70 ° C. It is more preferable that it is 50 degreeC-70 degreeC.

(2) Carboxylic acid, carboxylate salt The aluminum alloy substrate 1 is treated with a metal compound using an aqueous carboxylic acid solution such as tannic acid. Thereby, a metal compound film mainly composed of an aluminum salt and / or metal salt of carboxylic acid and / or a hydroxide is formed on the surface of the aluminum alloy substrate 1.

  The metal compound treatment may be performed using an aqueous solution of a metal salt of formic acid, acetic acid, oxalic acid, or succinic acid. In this case, on the surface of the aluminum alloy substrate 1, a basic metal compound film 2 mainly having an aluminum salt and / or a metal salt and a hydroxyl group in a part thereof is formed. For example, when the metal compound treatment is performed using an aqueous metal oxalate salt solution, the aqueous solution preferably has a concentration of 0.5 to 100 g / L and a temperature of 30 to 70 ° C.

(3) Fluoride aqueous solution of fluoride such as hydrofluoric acid, sodium fluoride, potassium fluoride, ammonium fluoride, ammonium hydrogen fluoride, silicofluoric acid, ammonium silicofluoride, borohydrofluoric acid, ammonium borofluoride Even if the aluminum alloy substrate 1 is immersed in the metal compound film, the metal compound film can be formed. As a result, the surface of the aluminum alloy substrate 1 is hydroxylated such as aluminum fluoride and / or metal fluoride containing metal other than aluminum and / or hydroxide of metal contained in the aluminum hydroxide and aluminum alloy substrate 1. A metal compound film 2 containing an object as a main component is formed. For example, when the metal compound treatment is performed using an aqueous ammonium hydrogen fluoride solution, the aqueous solution preferably has a concentration of 1 to 60 g / L and a temperature of 30 to 70 ° C.

Among the metal compound treatments shown above, alkali treatment, “(1) Group I element hydroxide, Group I element salt, Group II element hydroxide, Group II element salt” and “(3 It is preferable to use the method described in “(1) Phosphoric acid, phosphate” in “Boehmite treatment” and acid treatment.
Group I element hydroxide, Group I element salt, Group II element hydroxide, Group II element salt treatment and boehmite treatment are preferred because the hydroxide and hydrated oxide are aluminum alloys. This is because it is easily formed densely on the surface of the substrate, and its OH group and acid group are easily bonded to silanol produced by hydrolysis of the alkoxysilane of the triazine thiol derivative, and its bonding strength is high. The reason why the treatment with phosphoric acid and phosphate is preferable is that the phosphate compound formed as a metal compound film has a large polarity, and the alkoxysilane of the triazine thiol derivative is easily bonded to silanol produced by hydrolysis. it is conceivable that.
Of these, boehmite treatment is more preferable.

  The alkoxysilane-containing triazine thiol derivative penetrates into the metal compound film 2, and there are more sites that react with the metal compound film 2, and the silanol produced by hydrolysis of the alkoxysilane of the triazine thiol derivative and the hydroxyl group of the metal compound film 2, A phosphoric acid group, a carbonic acid group, a carboxylic acid group, or a fluoride undergoes a dehydration reaction or a dehalogenation reaction by heat treatment, and is chemically bonded. In this way, a stronger bond can be obtained between the resulting dehydrated silanol-containing triazine thiol derivative coating 3 and the metal compound film 2.

  Further, when the resin 4 is cooled and contracts after bonding, the relatively thick metal compound film 2 disperses and absorbs the stress generated between the resin 4 and the metal compound film 2, and the resin 4 is peeled off and the metal compound film 2. Has the effect of preventing the occurrence of cracks.

  The metal compound treatment using the above solution not only immerses the whole or part of the aluminum alloy substrate 1 in the solution (metal compound treatment solution) but also all or part of the surface of the aluminum alloy substrate 2. Coating with a solution by spraying, coating or the like, or contacting with a solution.

  Therefore, as is apparent from the above, the metal compound film 2 is not necessarily formed on the entire surface of the aluminum alloy substrate 2, and may be formed only on necessary portions as appropriate.

It goes without saying that the metal compound treatment may be performed by combining two or more methods of forming the metal compound film described above.
That is, the metal compound film may be formed by using a solution obtained by mixing a plurality of solutions used for the metal compound treatment (metal compound treatment liquid). Moreover, after performing a metal compound process using one kind of the solution (metal compound process liquid) used for the metal compound process mentioned above, a metal compound process is further performed using another kind of metal compound process liquid. Also good.

The metal compound film 2 obtained by the above-described metal compound treatment is usually roughened. That is, the surface roughness of the metal compound coating 2 is rougher than the surface roughness of the aluminum alloy substrate 1 before the metal compound treatment.
For example, the surface of the aluminum alloy substrate 1 having a surface roughness Ra of 0.10 μm or less is subjected to the above-described roughening treatment to Ra of 0.12 to 0.60 μm, and then the above-described metal compound treatment. By applying the above, it is possible to form the metal compound film 2 having an Ra of 0.15 μm or more. Further, when the roughening treatment is not performed, that is, for example, when the metal compound treatment is performed without performing the roughening treatment on the surface of the aluminum alloy substrate 1 having Ra of 0.10 μm or less, the formed metal compound film The surface roughness Ra of 2 is less than 0.15 μm.
The surface roughening of the metal compound coating 2 can increase the contact area between the dehydrated silanol-containing triazine thiol derivative coating 3 formed on the metal compound coating 2 and the metal compound coating 2, and thus contributes to an improvement in bonding strength. .

3. Coating of Alkoxysilane-Containing Triazine Thiol Derivative After forming the metal compound film 2 on the surface of the aluminum alloy substrate 1 by the method described above, the metal compound film 2 is coated with the alkoxysilane-containing triazine thiol derivative.
The alkoxysilane-containing triazine thiol derivative used may be a known one such as an alkoxysilane-containing triazine thiol metal salt.
That is, it is represented by the general formula shown in the following (Formula 1) or (Formula 2).

R ¹ , R ² and R ³ in the formula are hydrocarbons. R ¹ is, for example, any one of H—, CH ₃ —, C ₂ H ₅ —, CH ₂ ═CHCH ₂ —, C ₄ H ₉ —, C ₆ H ₅ —, and C ₆ H ₁₃ —. R ² is, for example, —CH ₂ CH ₂ —, —CH ₂ CH ₂ CH ₂ —, —CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ —, —CH ₂ CH ₂ SCH ₂ CH ₂ —, —CH. ₂ CH ₂ NHCH ₂ CH ₂ CH ₂ —. R ³ is, for example, — (CH ₂ CH ₂ ) ₂ CHOCONHCH ₂ CH ₂ CH ₂ — or — (CH ₂ CH ₂ ) ₂ N—CH ₂ CH ₂ CH ₂ —, in which case N and R ³ is a ring structure.

X in the formula _{is, CH 3 -, C 2 H} 5 -, n-C 3 H 7 -, i-C 3 H 7 -, n-C 4 H 9 -, i-C 4 H 9 -, t- One of C ₄ H ₉ —. Y _{is, CH 3 O-, C 2 H} 5 O-, n-C 3 H 7 O-, i-C 3 H 7 O-, n-C 4 H 9 O-, i-C 4 H 9 O- a _{t-C 4 H} 9 O- and alkoxy groups. N in a formula is either 1, 2, or 3 numbers. M is an alkali metal, preferably Li, Na, K or Ce.

  After coating the metal compound film 2, a solution of the alkoxysilane-containing triazine thiol derivative is prepared in order to form a coating of the alkoxysilane-containing triazine thiol derivative on the surface of the metal compound film 2. The solvent to be used is not particularly limited as long as the alkoxysilane-containing triazine dithiol derivative can be dissolved, and water and alcohol solvents correspond to this. For example, water, methanol, ethanol, propanol, carbitol, ethylene glycol, polyethylene glycol, and a mixed solvent thereof can be used. A preferable concentration of the alkoxysilane-containing triazine dithiol derivative is 0.001 g to 20 g / L, and a more preferable concentration is 0.01 g to 10 g / L.

  The aluminum alloy substrate 1 provided with the metal compound film 2 is immersed in the resulting alkoxysilane-containing triazine dithiol derivative solution. The preferable temperature range of a solution and the more preferable temperature range are 0 degreeC-100 degreeC, and 20 degreeC-80 degreeC, respectively. On the other hand, the immersion time is preferably 1 minute to 200 minutes, more preferably 3 minutes to 120 minutes.

  By this immersion, the alkoxysilane portion of the alkoxysilane-containing triazine thiol derivative is hydrolyzed to become silanol. Therefore, the alkoxysilane-containing triazine thiol derivative after the immersion becomes a silanol-containing triazine thiol derivative, and between the metal compound film 2 It is possible to obtain a chemical bond strength by forming a hydrogen bond and a loose bond.

  Therefore, this makes it possible to obtain an aluminum alloy member used for bonding a resin to the surface, which is composed of the aluminum alloy substrate 1, the metal compound film 2, and the silanol-containing triazine thiol derivative coating.

  Then, this aluminum alloy member is heated to 100 ° C. to 450 ° C. for the purpose of drying and dehydration reaction promoting heat treatment. By this heating, the silanol portion of the silanol-containing triazine thiol derivative is dehydrated or dehalogenated with at least one of the hydroxide, carboxylate, phosphate, silicic acid and fluoride contained in the metal compound film 2 described above. Therefore, the silanol-containing triazine thiol derivative is changed to a dehydrated silanol-containing triazine thiol derivative and chemically bonded to the metal compound film 2.

  Therefore, as a result of this heat treatment, an aluminum alloy member used for joining the resin to the surface, which is composed of the aluminum alloy substrate 1, the metal compound film 2, and the dehydrated silanol-containing triazine thiol derivative coating 3, can be obtained.

  Next, in order to strengthen the bonding force between the dehydrated silanol-containing triazine thiol derivative and the resin, the dehydrated silanol-containing triazine thiol derivative formed on the metal compound film 2 is appropriately used as a bonding aid as necessary. For example, compounds having binding properties by radical reaction such as N, N′-m-phenylene dimaleimide, which is a dimaleimide, and N, N′-hexameethylene dimaleimide, and diclemyl peroxide, benzoyl peroxide, etc. Immerse in a solution containing peroxide or other radical initiator. After the immersion, the aluminum alloy member is dried and heat-treated at 30 ° C. to 270 ° C. for 1 minute to 600 minutes.

As a result, the dehydrated silanol-containing triazine thiol derivative removes the metal ion of the triazine thiol metal salt (triazine thiol derivative) portion, and the sulfur becomes a mercapto group, and this mercapto group becomes N, N′-m-phenylenedimaleimide. It reacts with one of the two double bonds of maleic acid to form a dehydrated silanol-containing triazine thiol derivative bonded with N, N′-m-phenylene dimaleimide.
The radical initiator has a function of generating a radical by decomposition by heat such as heating performed when molding a resin, opening the other bond of the two double bonds by the maleic acid, and reacting and bonding with the resin.

  Furthermore, if necessary, a solution prepared by dissolving a radical initiator such as a peroxide or a redox catalyst in an organic solvent such as benzene or ethanol is attached to the surface of the aluminum alloy member by spraying by dipping or spraying. Air dry.

  The radical initiator generates radicals by thermal decomposition such as heating performed when molding the resin, opens the other bond of the two double bonds by the maleic acid, or forms a metal salt part of the triazine thiol derivative. It works to react and bond with the resin.

  The components of the metal compound film 2 and the dehydrated silanol-containing triazine thiol derivative layer 3 of the aluminum article 100 according to the present invention can be identified by, for example, XPS analysis (X-ray photoelectron spectroscopy).

4). Bonding with Resin An aluminum alloy member 100 having a metal compound film 2 and a dehydrated silanol-containing triazine thiol derivative layer 3 on the surface of the aluminum metal substrate 1 and the resin 4 are bonded (composite integrated) to obtain an aluminum article 100. The resin 4 is disposed so as to be in contact with the dehydrated silanol-containing triazine thiol derivative layer 3 in a heated state. As a result, the resin 4 and the triazine thiol derivative part of the dehydrated silanol-containing triazine thiol derivative 3 (triazine thiol metal salt part or triazine thiol derivative combined with bismaleimides) react with the radical of the radical initiator as a chemical, Create a bond.
The resin may be disposed only on a part of the dehydrated silanol-containing triazine thiol derivative coating 3.

  In the present invention, the resin 4 is a concept including an adhesive. That is, when a resin that functions as an adhesive is selected as the resin 4, the obtained aluminum alloy article 100 can be bonded to another article with the resin 4. Examples of such another article include a metal article made of aluminum, stainless steel, iron, magnesium, titanium, zinc, copper or a metal thereof or an alloy thereof, and an article made of a resin or the like. When the other article is a metal article, the bonding strength with the adhesive resin 4 can be further increased by forming the metal compound film 2 and the dehydrated silanol-containing triazine thiol derivative layer 3 on the surface thereof.

  As a method for disposing the heated resin 4 on the dehydrated silanol-containing triazine thiol derivative coating 3, the following four methods can be exemplified.

  In the first method, an aluminum alloy member (including a metal substrate 1, a metal compound film 2, and a dehydrated silanol-containing triazine thiol derivative coating 3) is placed in a mold, and a molten resin is injected into the mold to insert-mold the article. Alternatively, when an outsert molded article is obtained, the radical initiator is decomposed by the heat of the mold and the resin, and the triazine thiol derivative coating and the resin are chemically bonded by a radical reaction to join the aluminum alloy member and the resin 4 together. It is an injection molding method.

  In the second method, after obtaining an injection molded product in which an aluminum alloy member and a resin are integrated by injection molding, the injection molded product is heated in an oven or a hot plate in a state where a load is applied to start radicals. This is a first welding method in which the agent is decomposed and chemically bonded by radical reaction to join the aluminum alloy member and the resin.

  In the third method, an aluminum alloy member (including a metal substrate 1, a metal compound film 2, and a dehydrated silanol-containing triazine thiol derivative coating 3) is placed on a hot plate and heated, and a resin molded article (resin 4) is formed thereon. This is a second welding method in which a metal substrate and a resin are brought into close contact with each other by reacting and bonding by applying a load and holding it.

In the fourth method, an adhesive (resin 4) made of a resin is applied to an aluminum alloy member (including a metal substrate 1, a metal compound film 2, and a dehydrated silanol-containing triazine thiol derivative coating 3), and an adhesive is adhered onto the adhesive. After placing another article to be applied, a predetermined load is applied, and the aluminum alloy article and the resin 4 are bonded at the same time by being left at room temperature or being cured by heating in an oven. It is a method of bonding between the two.
The adhesive (resin 4) may include a reinforcing material such as glass fiber, ceramic powder, and carbon fiber. In addition, a filler, glass fiber, etc. are mixed into a sheet molding compound (SMC) or prepreg or thermosetting resin of uncured material that is made into a sheet by blending a filler with a thermosetting resin and impregnating the reinforcing fiber. Bulk molding compound (BMC) that is mixed in a bulk form. In the case of bonding at room temperature, the adhesive needs to be reactively cured at room temperature.

  In the case of using the first method, it is preferable that the mold temperature is 20 to 220 ° C. and the aluminum alloy member and the resin are held in the mold for 45 seconds to 10 minutes. When the second to fourth methods are used, it is preferable that the temperature of the oven or the hot plate be 30 to 430 ° C. and the load is applied for 1 minute to 10 hours. The temperature needs to be equal to or higher than the decomposition temperature of the radical initiator, and the holding time needs a sufficient time for the radical to form a chemical bond between the triazine thiol derivative and the resin.

  The joining of the aluminum alloy member and the resin is not limited to the above-described injection molding and the welding method for heating the injection-molded product, and any joining technique for industrially used aluminum alloy and resin is used. be able to. A preferred example of such a joining method is hot plate welding. Hot plate welding is a method in which a resin is brought into contact with a heat source such as a high-temperature plate and melted, and the aluminum alloy member is pressed and joined before the molten resin cools and hardens.

  As the resin 4 to be joined, any industrially usable resin can be used, but a resin having an element that reacts with a radical or a functional group is preferable. Examples of such preferred resins are phenol resin, hydroquinone resin, cresol resin, polyvinyl phenol resin, resorcin resin, melamine resin, glyphtal resin, epoxy resin, modified epoxy resin, polyvinyl formal resin, polyhydroxymethyl methacrylate and its co-polymer. Polymer, polyhydroxyethyl acrylate and copolymer, acrylic resin, polyvinyl alcohol and copolymer, polyvinyl acetate, polyethylene terephthalate resin, polyimide resin, polyetherimide resin, polyketoneimide resin, polybutylene terephthalate resin, unsaturated Polyester resin, polyphenylene sulfide resin, polyphenylene oxide resin, polystyrene resin, ABS resin, polycarbonate resin (PC resin), 6-nylon resin , 66-nylon resin, 610-nylon resin, aromatic polyamide resin, urea resin, styrene elastomer resin, olefin elastomer resin, vinyl chloride elastomer resin, urethane elastomer resin, ester elastomer resin, amide elastomer resin, and A composite resin in which two or more selected from these resins are combined, and a reinforced resin in which these resins are reinforced with glass fibers, carbon fibers, ceramics, or the like.

  Further, when an adhesive is used as the resin 4, the type of the adhesive is not particularly limited, but an epoxy adhesive, an acrylic adhesive, a polyurethane adhesive, a silicone adhesive, a rubber adhesive, Industrially available adhesives such as polyester adhesives, phenol adhesives, polyimide adhesives, cyanoacrylate adhesives, elastomer adhesives, hot melt adhesives, and the like can be used. As a sheet molding compound (SMC), an unsaturated polyester resin is blended with calcium carbonate and impregnated into glass fiber to form a sheet. As a bulk molding compound (BMC), an unsaturated polyester resin is used. A mixture of calcium carbonate and short glass fiber can be used.

  As described above, an aluminum alloy article 100 in which the aluminum alloy substrate 1 and the resin 4 are bonded via the metal compound film 2 and the dehydrated silanol-containing triazine thiol derivative coating 3 can be manufactured.

  The aluminum alloy article obtained by this method does not require any special machining on the surface of the aluminum article in addition to the advantage that the bonding strength between the aluminum alloy substrate and the resin is high. Since the resin can be joined without using a relaxing elastic resin or the like, there is an advantage that the number of processing steps is small, the joint is finished cleanly, and the finish can be finished with high dimensional accuracy.

  Furthermore, by covering the portion of the aluminum substrate 1 with poor molding accuracy with the resin 4, the article is finished with the resin molding accuracy, and the yield of the product can be increased.

(1) Cleaning treatment Aluminum alloy rolled plates (Examples 1-22, Comparative Examples 1-30) of A5052 (Japanese Industrial Standard, JIS A5052P) having a length of 80 mm, a width of 20 mm, and a thickness of 1.5 mm, and a length of 80 mm An aluminum alloy die cast plate (Examples 23 to 44) of ADC12 (Japanese Industrial Standard, JIS ADC12) having a width of 20 mm and a thickness of 2.0 mm was processed by the method described in detail below.
Prior to the cleaning treatment, a surface roughness Ra (arithmetic average roughness Ra defined in JIS B0601: 2001) was measured using a laser microscope VK-8710 manufactured by Keyence Corporation. Ra of the rolled plate of A5052 was 0.08 μm, and Ra of the ADC12 die cast plate was 0.10 μm.

The cleaning treatment was performed by immersing the aluminum alloy substrate 1 for 5 minutes in an aqueous solution having a pH of about 9.5 and an alkali component at a temperature of 40 ° C. of 30 g / L (of which the proportion of condensed phosphate is 50 to 60%). . After the washing treatment, it was washed with pure water for 1 minute.
The surface roughness Ra measured after the cleaning treatment was 0.08 μm for the A5052 rolled material and 0.11 μm for the ADC12 die-cast plate, which was almost the same as the sample before the cleaning treatment.

After the cleaning treatment, the surface roughening treatment and the metal compound treatment were performed.
These conditions are shown in Tables 1 and 2.

(2) Roughening treatment The type, concentration and pH of the treatment liquid (aqueous solution) used in Table 1 and the time of immersion in each treatment liquid are shown.
The roughening treatment was not performed on the samples of Examples 1 to 6 and Examples 23 to 28.

  The surface roughness Ra of the sample subjected to the roughening treatment was 0.12 to 0.22 μm for the A5052 rolled material and 0.16 to 0.19 μm for the ADC12 die cast plate.

(3) Metal Compound Treatment Next, metal compound treatment was performed under the conditions shown in Tables 1 and 2.
In addition, the metal compound process was not performed about the sample of Comparative Examples 1-22.

  In the samples of Examples 1, 7, 23, and 29 and the sample of Comparative Example 23 in which the metal compound treatment was performed using the zinc phosphate aqueous solution, the metal compound film mainly composed of zinc phosphate was formed on the surface of the aluminum alloy substrate 1. Formed.

  In the samples of Examples 2, 8, 24, and 30 and the sample of Comparative Example 24 in which the metal compound treatment was performed using the zirconium phosphate aqueous solution, the metal compound film mainly containing zirconium phosphate was formed on the surface of the aluminum alloy substrate 1. Formed.

  In the samples of Examples 3, 9, 25, and 31 and the sample of Comparative Example 25 in which the metal compound treatment was performed using the zirconium vanadium phosphate aqueous solution, zirconium phosphate and vanadium phosphate were the main components on the surface of the aluminum alloy substrate 1. A metal compound film was formed.

  In the samples of Examples 4, 10, 26, and 32 and the sample of Comparative Example 26 in which the metal compound treatment was performed using the sodium hydroxide aqueous solution, the metal compound film mainly composed of hydroxide was formed on the surface of the aluminum alloy substrate 1. Formed.

  In the samples of Examples 5, 11, 27, and 33 and the sample of Comparative Example 27 in which the metal compound treatment was performed using an aqueous ammonia solution, a metal compound film mainly composed of hydroxide was formed on the surface of the aluminum alloy substrate 1. It was done.

The samples of Examples 6, 12-22, 28, 34-44 and Comparative Examples 28-30 were subjected to boehmite treatment.
A triethanolamine aqueous solution having a concentration of 3 g / L and pH 8.0 was used as the boehmite treatment solution. The temperature of the aqueous solution was set to 95 ° C., and the sample was immersed in the aqueous solution for 15 minutes. And to obtain a metal compound coating that boehmite is a hydrated oxide of aluminum (γ-AlO · OH and _α-Al 2 _{O 3)} as a main component.

  The surface roughness Ra of the sample subjected to the metal compound treatment as described above is 0.16 to 0.25 μm for the A5052 rolled material and 0.18 to 0 for the ADC12 die-cast plate when the surface roughening treatment is performed. When the surface roughening treatment was not performed, the thickness was 0.11 to 0.13 μm for the A5052 rolled material and 0.13 to 0.15 μm for the ADC12 die-cast plate.

  Tables 3 to 4 show the measurement results of the surface roughness Ra of the examples and comparative examples after the metal compound treatment. About the sample which did not perform a metal compound process, the measurement result of surface roughness Ra after a roughening process is shown.

(3) Coating of alkoxysilane-containing triazine thiol derivative Next, all of the examples (Examples 1 to 44) and the samples of Comparative Examples 12 to 22 were immersed in an alkoxysilane-containing triazine thiol solution.
The alkoxysilane-containing triazine thiol derivative used was triethoxysilylpropylaminotriazine thiol monosodium, dissolved in a solvent of ethanol 95: water 5 (volume ratio) so that the concentration was 0.7 g / L, and the solution was dissolved. Obtained. This triethoxysilylpropylaminotriazine thiol monosodium solution was immersed for 30 minutes at room temperature.

  Thereafter, these samples were heat-treated in an oven at 160 ° C. for 10 minutes to complete the reaction and dry. Then, an acetone solution containing N, N′-m-phenylene dimaleimide (N, N′-1,3-phenylene dimaleimide) having a concentration of 1.0 g / L and dicumyl peroxide having a concentration of 2 g / L was added to room temperature. And then heat-treated in an oven at 150 ° C. for 10 minutes. Thereafter, an ethanol solution of dicumyl peroxide having a concentration of 2 g / L was sprayed on the entire surface of the sample at room temperature and air-dried.

(4) Bonding with resin The samples shown in Tables 1 and 2 were bonded to the respective samples to obtain samples of aluminum alloy articles.
The samples of Examples 16, 18, 20, 22, 38, 40, 42 and 44 were joined by injection molding.
That is, the resin is molded into a plate having a length of 80 mm, a width of 20 mm, and a thickness of 3 mm in the mold, and the end portion of one surface having a length of 12 mm and a width of 20 mm is subjected to the above processing. The aluminum alloy plate sample was placed on the end portion of the sample and contacted with a portion having a length of 12 mm and a width of 20 mm, and this portion was joined.

In the samples of Examples 1 to 15, 17, 19, 21, 23 to 37, 39, 41, and 43 and Comparative Examples 1 to 28, bonding was performed by a welding method (the above-described second welding method).
That is, each sample is fixed with a heat-resistant tape so as to come into contact with the types of resin plates shown in Tables 1 and 2, and the heating point is set to the resin melting point (or meltable temperature) of each resin. An aluminum alloy article sample having the same shape as the aluminum alloy article sample obtained by the injection molding described above is obtained by placing a sample fixed with heat-resistant tape, pressurizing the sample with a load of 9 kgf from above, and thermally fusing it. It was.

Details of the resin used are shown below.
In the samples of Examples 16 and 38, PPS resin (Fortron PPS 1140A64) manufactured by Polyplastics Co., Ltd. was injection molded at 320 ° C. to obtain aluminum article samples.

  In the samples of Examples 18 and 40, PC / ABS resin (Iupilon MB2215R) manufactured by Mitsubishi Engineering Plastics Co., Ltd. was injection molded at 270 ° C. to obtain aluminum article samples.

  In the samples of Examples 20 and 42, 66 nylon (Amilan CM3001-N) manufactured by Toray Industries, Inc. was injection molded at 295 ° C. to obtain aluminum article samples.

  In the samples of Examples 22 and 44, a TPEE elastomer resin (Primalloy B1600N) manufactured by Mitsubishi Chemical Corporation was injection molded at 230 ° C. to obtain aluminum article samples.

  In the samples of Examples 1 to 14, 23 to 36, and Comparative Examples 1 to 30, the above-described shape is obtained using a resin plate of ABS resin (Stylac (R) -ABS General Purpose 026) manufactured by Asahi Kasei Chemicals Corporation. The sample obtained was fixed and placed on a heating body set at 230 ° C. and welded to obtain an aluminum alloy article sample.

  In the samples of Examples 15 and 37, a PPS resin (Fortron PPS 1140A64) manufactured by Polyplastics Co., Ltd. was used to fix the sample to the shape described above, and the obtained sample was heated to 320 ° C. An aluminum alloy article sample was obtained by placing on the body and heat-sealing.

  In the samples of Examples 17 and 39, the resin plate of PC / ABS resin (Iupilon MB2215R) manufactured by Mitsubishi Engineering Plastics Co., Ltd. was used to fix the sample to the shape described above, and the obtained sample was set at 260 ° C. An aluminum alloy article sample was obtained by placing and welding on the heating element.

  In the samples of Examples 19 and 41, the resin plate of 66 nylon (Amilan CM3001-N) manufactured by Toray Industries, Inc. was used to fix the sample to the shape described above, and the resulting sample was heated to 290 ° C. An aluminum alloy article sample was obtained by placing on and heat-sealing.

  In the samples of Examples 21 and 43, a TPEE elastomer resin (Primalloy B1600N) manufactured by Mitsubishi Chemical Corporation was used to fix the sample to the shape described above, and the obtained sample was set to 230 ° C. An aluminum alloy article sample was obtained by placing on and heat-sealing.

(5) Strength evaluation About the samples of Examples 1-20, 23-42, and Comparative Examples 1-30, the tension test which shows a detail below was done.
On the other hand, the samples of Examples 21, 22, 43 and 44 were subjected to a 90-degree peel test which will be described in detail below.

  The autograph AG-10TD tester manufactured by Shimadzu Corporation was used for the tensile test, and the aluminum plate part (aluminum alloy substrate) of the aluminum alloy article sample and the terminal part of the resin plate part (resin) (the terminal part on the opposite side to the joint part) ) Were each gripped with a flat chuck and pulled at a pulling speed of 5 mm / min until breaking. The stress obtained by dividing the maximum ultimate load up to the break by the joining area (length 12 mm × width 20 mm) was defined as joining strength (tensile shear strength). The test was performed three times for each sample.

  In the 90-degree peel test, the alloy substrate is fixed by a tensile tester using a fixing jig so that the aluminum plate portion (aluminum alloy base material) of the aluminum alloy article sample and the joint surface of the resin are horizontal. It is fixed to the base, the part away from the joint of the resin is gripped with a flat chuck, and the flat chuck is moved in a direction that forms an angle of 90 degrees with the joint surface, thereby peeling at a speed of 100 mm / min. The stress obtained by dividing the ultimate load by the joining length (length 20 mm) was determined. The test was performed three times for each sample.

Tables 3 and 4 show the tensile test results (tensile shear strength) and 90-degree peel test results (90-degree peel strength).
The results in Table 3 and Table 4 show the average value of the test results performed three times for each sample.

  All of the example samples showed an excellent tensile shear strength of 3.0 MPa or more. On the other hand, as for the comparative sample, even the highest sample was 1.6 MPa, which was significantly inferior to the example sample. In the example sample, the fracture was confirmed at the joint surface or the resin part. Furthermore, regarding the fracture surface (aluminum alloy plate side) at the joint surface, adhesion of resin or adhesive was observed, and it was confirmed that part of the fracture occurred in the resin.

  The example samples subjected to the 90-degree peel test showed a sufficiently high value of the 90-degree peel strength of 1.3 N / mm.

Claims (12)

An aluminum alloy article comprising a substrate made of aluminum or an aluminum alloy, and a resin bonded to at least a part of the surface of the substrate via a dehydrated silanol-containing triazine thiol derivative coating,
Between the dewatering silanol-containing triazinethiol derivative coating and the substrate, the aluminum alloy article, which comprises a metal compound film mainly composed of Li down salt.   2. The aluminum according to claim 1, wherein the metal compound film includes at least one phosphate selected from the group consisting of a metal hydrogen phosphate, a metal dihydrogen phosphate, and a metal phosphate. Alloy article.   The metal compound film is composed of zinc phosphate, zinc hydrogen phosphate, manganese phosphate, manganese hydrogen phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, calcium phosphate, calcium calcium phosphate, aluminum phosphate, zirconium phosphate, phosphoric acid. The aluminum alloy article according to claim 2, comprising at least one selected from the group consisting of vanadium and zirconium vanadium phosphate. A method for producing an aluminum alloy article, wherein a resin is bonded to at least a part of a substrate made of aluminum or an aluminum alloy using an alkoxysilane-containing triazine thiol derivative,
At least a portion of the substrate surface using at least one aqueous solution selected-phosphate and-phosphate salt or al, forming a metal compound film mainly composed of Li down salt,
Contacting the metal compound film with an alkoxysilane-containing triazine thiol derivative;
Bonding a resin to a portion in contact with the alkoxysilane-containing triazine thiol derivative;
The manufacturing method characterized by including.   The dissolved water solution is composed of zinc phosphate, zinc hydrogen phosphate, manganese phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, calcium sodium phosphate, calcium phosphate, zirconium phosphate, vanadium phosphate and zirconium vanadium phosphate. The manufacturing method according to claim 4, comprising at least one selected from the group consisting of:   The manufacturing method according to claim 4, further comprising a roughening treatment step of increasing a surface roughness of the aluminum alloy substrate before the step of forming the metal compound. A base made of aluminum or an aluminum alloy, and an aluminum alloy member in which at least a part of the surface of the base is coated with a dehydrated silanol-containing triazine thiol derivative or a silanol-containing triazine thiol derivative,
Between the dewatering silanol-containing triazinethiol derivative coating or the silanol-containing triazinethiol derivative coating and the substrate, an aluminum alloy member, characterized in that it comprises a metal compound film mainly composed of Li down salt.   The aluminum according to claim 7, wherein the metal compound film includes at least one phosphate selected from the group consisting of a metal hydrogen phosphate, a metal dihydrogen phosphate, and a metal phosphate. Alloy member.   The metal compound film is composed of zinc phosphate, zinc hydrogen phosphate, manganese phosphate, manganese hydrogen phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, calcium phosphate, calcium calcium phosphate, aluminum phosphate, zirconium phosphate, phosphoric acid. The aluminum alloy member according to claim 8, comprising at least one selected from the group consisting of vanadium and zirconium vanadium phosphate. A method for producing an aluminum alloy member, wherein an alkoxysilane-containing triazine thiol derivative is brought into contact with at least a part of a substrate made of aluminum or an aluminum alloy,
At least a portion of the substrate surface using at least one aqueous solution selected-phosphate and one phosphate al, forming a metal compound film mainly composed of Li down salt,
Contacting the metal compound film with an alkoxysilane-containing triazine thiol derivative;
The manufacturing method characterized by including.   The dissolved water solution is composed of zinc phosphate, zinc hydrogen phosphate, manganese phosphate, calcium hydrogen phosphate, calcium dihydrogen phosphate, calcium sodium phosphate, calcium phosphate, zirconium phosphate, vanadium phosphate and zirconium vanadium phosphate. The manufacturing method according to claim 10, comprising at least one selected from:   The method according to claim 10 or 11, further comprising a roughening treatment step of increasing a surface roughness of the aluminum alloy substrate before the step of forming the metal compound.

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