JPH101781A - Metallic surface treating agent, treatment and surface treated metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve slidability, coating adhesion and corrosion resistance after coating the surface of a metal by incorporating specified amounts of organic polymer compound contg. nitrogen atoms, phosphate ions and Al ions into a metallic surface treating agent. SOLUTION: This metallic surface treatment agent has a water dispersible or emmlsifiable form and is prepd. by incorporating an organic high polymer compound contg. at least one or more nitrogen atoms or the salt thereof by 0.01 to 10g/L, 0.01 to 0.8g/L phosphate ions and 0.01 to 0.5g/L aluminum ions. The organic high polymer compound in the treating agent has at least one or more kinds of resin skeletons among epoxy resin, acrylic resin, urethane resin, phenol resin, olefin resin and amide resin and has functional groups shown by formula I or II. The aluminum ions promote the formation of dense and uniform organic coating film. Thus, the desired organic coating film can be formed with the low phosphate ion concn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal surface treating agent, a treating method, and a surface treated metal material, particularly to an improvement in lubricity (lubricity) and corrosion resistance, and furthermore, an environmentally friendly metal with a lower phosphoric acid concentration than before It relates to a surface treatment agent and the like.

[0002]

2. Description of the Related Art As a metal surface treatment, for example, DI processing (Drawing & Iron
ing), then remove the smut by acid cleaner,
Further, there may be mentioned a chemical conversion treatment performed after washing with water. This chemical conversion treatment is performed for the purpose of improving corrosion resistance and coating film adhesion. There are two types of chemical conversion treatment: chromate treatment and non-chromate treatment. In recent years, non-chromate treatment has been mainly performed from the viewpoint of pollution prevention. As the non-chromium chemical conversion treating agent for the non-chromate treatment, for example, a zirconium phosphate-based treating agent is widely used.

For example, in Japanese Patent Publication No. 57-39314, "Aluminum Surface Treatment Method", a method of treating the surface of aluminum with an acidic aqueous solution containing a zirconium salt, hydrogen peroxide and phosphoric acid has been proposed. . Japanese Patent Application Laid-Open No. 7-48677, entitled "Surface Treatment Solution and Treatment Method Combined with Aluminum DI Can and Tin DI Can", contains a phosphate ion and a zirconium compound and has a pH of 2.0 or more.
An oxidizing agent of not more than 500 ppm and at least 2,000 or less of hydrofluoric acid or fluoride as fluorine.
There has been proposed a method of performing a surface treatment of an aluminum DI can with a DI can treatment liquid containing not more than ppm.

Usually, in the manufacturing process of an aluminum can, after a chemical conversion treatment, the aluminum can is sufficiently washed with water, drained and dried in an oven, and then printed and painted. When moving to the printing and painting processes, the width of the belt conveyor that conveys the aluminum cans sharply decreases. At this time, jamming (poor conveyance) may occur due to contact between the cans or contact between the cans and the guide of the belt conveyor.
Due to this jamming, the transport speed of the can is reduced, and the production efficiency of the can is reduced.

In general, when a treatment is carried out using the above-mentioned zirconium phosphate-based treating agent, a film of zirconium oxide or zirconium phosphate is formed on the surface of aluminum. Poor film adhesion was likely to occur. Further, since the inorganic coating does not have a slippery surface, jamming may occur when the can is conveyed by the belt conveyor as described above, and the production efficiency of the can may be reduced.

Therefore, in recent years, treatment agents that form not only inorganic films but also organic films have been proposed.
For example, JP-A-7-331276, “Composition for surface treatment of aluminum-containing metal material and surface treatment method”
Has proposed a surface treatment composition containing a phosphate ion, a water-soluble zirconium compound, a fluoride, and a water-soluble polyamide having at least one selected from tertiary amine groups and polyalkylglycol groups. I have.

However, when the water-soluble zirconium compound in the surface treatment composition described in the above publication forms a zirconium phosphate coating layer on a metal surface with a certain thickness or more, the coating also causes cohesive failure. As a result, there is a problem that the coating film adhesion is reduced.

Accordingly, a treatment agent has been proposed which forms a single organic film on a metal surface without forming an inorganic film. For example, "Surface treatment solution for aluminum and aluminum alloy" disclosed in JP-A-4-66671 includes 1/30 g / l of phosphate ion, 0.1 to 10 g / l of condensed phosphate ion, and Containing 0.1 to 20 g / l as a solid content of the water-soluble resin represented by the general formula,
A surface treatment liquid having a pH of 2.0 to 6.5 has been proposed.

[0009]

Embedded image Japanese Patent Application Laid-Open No. Hei 7-278410 discloses a "polymer composition for treating a metal material surface and a treating method", which proposes a treating agent that forms an inorganic film and also forms an organic film of a phenolic resin. . That is, this treating agent comprises an acidic compound and a polymer of the formula (I) [X = H, C _1-5 alkyl, C _1-5 hydroxyalkyl, a compound of the formula (II) R ¹ , R ² =
H, OH, C _{1- 10} alkyl, C etc. _1-10 hydroxyalkyl group, Y ^1, Y ² = H or Z group following formula 6 are shown formula (III) or formula Represented by Formula 7 (IV), R ³ ~R ⁷ = C _1-10
Average number of substituted Z groups on each benzene ring in the polymer molecule, such as alkyl and C _1-10 hydroxyalkyl groups = 0.2 to 1.
0, n = 2 to 50], and a treatment method in which a treatment agent having a pH of 2.0 to 6.5 is brought into contact with a metal surface.

[0010]

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Embedded image Japanese Patent Application Laid-Open No. 7-278836 entitled "Surface Treatment Composition and Surface Treatment Method for Aluminum-Containing Metal Material" proposes a treatment agent which forms an inorganic film and also forms an organic film of bisphenol A resin. ing. That is, this treating agent can be used to convert a phosphate ion, a condensed phosphate ion and an aqueous polymer into 1 to 30: 0.1 to 10:
A treating agent having a pH of 2.0 to 6.5 and a surface of the above material are contacted at 30 to 65 ° C for 5 to 60 seconds, washed with water, and heated and dried at a mixing ratio of 0.1 to 20 by weight. A surface treatment method is disclosed. Here, the water-soluble polymer has a chemical structure represented by the following formula (V), wherein Y ¹ and Y ² are H atoms or the following formula (VI) or the following formula (V). Z is the Z group of (VII), and has an average Z group substitution number of the benzene ring in the polymer molecule of 0.2 to 1.0.

[0011]

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[0012]

However, any of the surface treating agents disclosed in JP-A-4-66671, JP-A-7-278410 and JP-A-7-278636 are present on the metal surface. Unless an organic coating layer having a certain thickness or more is formed, there is a problem that the unpainted corrosion resistance becomes insufficient. On the other hand, when the thickness of the organic film is large, there is a problem that interference colors derived from the organic polymer compound are generated and the appearance is deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to improve the corrosion resistance (in the case of an aluminum DI can, the resistance to blackening of boiling water in the case of aluminum DI cans) in the low coating amount region, In addition to providing a metal surface treatment agent and a treatment method with improved surface slipperiness (lubricity), coating adhesion, and corrosion resistance after coating, corrosion resistance when not painting, metal surface slippage, coating adhesion, An object of the present invention is to provide a surface-treated metal material having corrosion resistance.

[0014]

In order to achieve the above-mentioned object, a metal surface treating agent of the present invention comprises a water-soluble, water-dispersible or emulsion organic polymer compound, a phosphate ion, an aluminum ion, It contains.

Further, in the metal surface treating agent according to the present invention, the organic polymer compound is at least one of an epoxy resin, an acrylic resin, a urethane resin, a phenol resin, an olefin resin, and an amide resin. Wherein at least one of the organic polymer compounds has a functional group represented by the following chemical formula (10) or (11).

[0016]

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Embedded image When the metal surface treatment agent of the present invention is brought into contact with the metal surface,
At the same time as the metal surface is etched by the phosphate ions, protons near the metal surface (near the interface) are consumed by the cathode reaction. Therefore, the interface pH increases. On the other hand, water-soluble, water-dispersible or emulsion organic polymer compound contained in the metal surface treatment agent of the present invention,
It dissolves on the acidic side, but coagulates and precipitates in the pH range from weakly acidic to neutral. Further, since the organic polymer compound forms an insoluble compound with aluminum ions, the deposition of an organic film derived from the organic polymer compound on the metal surface is promoted by adding aluminum ions to the metal surface treatment agent. Can be. Aluminum ions are
Promotes the formation of a dense and uniform organic film (eg, a resin film).

Accordingly, a dense and uniform organic film having a desired thickness can be formed on the metal surface even at a low phosphoric acid concentration. This makes it possible to simultaneously satisfy the slipperiness, coating film adhesion, and corrosion resistance.

The metal surface treating agent according to the present invention has a phosphate ion concentration of 0.05 to 0.8 g / l.

By controlling the aluminum ion concentration, the formation of an organic film can be promoted.
A desired organic film can be formed at a low phosphate ion concentration.

Further, the treatment method according to the present invention is a treatment method in which the above metal surface treating agent is brought into contact with the metal surface, followed by washing with water and drying.

Further, the surface-treated metal material according to the present invention is a metal material that has been surface-treated using the above-mentioned metal surface treatment agent.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The metal surface treating agent according to the present invention comprises:
It contains a water-soluble, water-dispersible or emulsion organic polymer compound, a phosphate ion and an aluminum ion.

The organic polymer compound is a compound having at least one resin skeleton of an epoxy resin, an acrylic resin, a urethane resin, a phenol resin, an olefin resin, and an amide resin. At least one of the polymer compounds is represented by the above formula (10) or (11).
Having the functional groups shown in

[0024] The content of the organic polymer compound relative to the metal surface treating agent is preferably from 0.01 to 10 g / l, more preferably from 0.1 to 5 g / l. When the content of the organic polymer compound is less than 0.01 g / l, the thickness of the organic resin film becomes insufficient and the barrier effect is reduced, so that the corrosion resistance is reduced. On the other hand, when the content of the organic polymer compound is more than 10 g / l, the organic resin film becomes unnecessarily thick, causing interference color on the object to be treated after the surface treatment, resulting in poor appearance. In addition, an excess amount of the organic polymer compound is present in the treatment bath, so that the stability of the surface treatment bath is reduced, and the cost is increased, resulting in poor economic efficiency.

The source of phosphate ions phosphate ions is phosphoric acid or a salt thereof. As the salt, sodium, potassium, magnesium and the like are preferable. Phosphate ions are used for acidifying an aqueous solution to dissolve the organic polymer compound or for etching a metal surface. The concentration of this phosphate ion is 0.05 to 0.95 g / l with respect to the metal surface treatment agent.
It is preferred that Phosphoric acid content is 0.05g /
If less than 1, the etching becomes insufficient and
The acidity becomes insufficient, and the organic polymer compound becomes difficult to dissolve. For this reason, the organic film hardly precipitates on the metal surface, and the corrosion resistance is reduced. On the other hand, if it exceeds 0.95 g / l, the etching effect is saturated and uneconomical, and
Heavy load during wastewater treatment.

Aluminum ions Aluminum ions have the effect of accelerating the deposition rate of a resin film (that is, a film containing an organic polymer compound) and promoting the densification and uniformity of the film. As a supply source of aluminum ions, aluminum nitrate, aluminum hydroxide, aluminum fluoride, and when the surface-treated metal is an aluminum alloy material, aluminum eluted by etching may be used. The content of aluminum ions with respect to the metal surface treating agent is 0.01 g / l to 0.5 g / l.
1 is preferable, and more preferably 0.05 g / l to 0.2.
g / l. Aluminum ion content of 0.01
When the amount is less than g / l, the organic polymer compound hardly precipitates on the metal surface, and the corrosion resistance becomes insufficient. on the other hand,
When the content of the aluminum ion exceeds 0.5 g / l, the organic polymer compound and the insoluble compound are formed in the treatment liquid, and the treatment liquid becomes turbid or sludge is generated. For this reason, the appearance deteriorates.

The metal surface treating agent according to the present invention may contain the following etching agents, etching aids, polyvalent anions, oxidizing agents, and heavy metals as required.

Etchant Examples of the etchant include hydrofluoric acid and salts thereof. The content of the etching agent with respect to the metal surface treatment agent is preferably 0.005 g / l to 5 g / l. When the content of the fluoride ion is less than 0.005 g / l, the etching of the metal surface becomes insufficient and the increase of the interface pH becomes insufficient, so that the resin film hardly precipitates on the metal surface and the corrosion resistance is poor. . On the other hand, when the content of fluoride ions is 5
If the amount exceeds g / l, the etching becomes excessive, so that the resin film is hardly deposited on the metal surface, the corrosion resistance is reduced, and the slipperiness is also insufficient.

Etching Aid Silica hydrofluoric acid, borofluoric acid and salts thereof can be used as an etching aid . The content of the etching aid with respect to the metal surface treatment agent is 0.003 g / l to 5 g / l.
l is preferred. 0.003g of etching aid content
If it is less than / l, the metal surface will be insufficiently etched, the resin film will not easily deposit on the metal surface, and the corrosion resistance will be poor. On the other hand, when the content of the etching aid exceeds 5 g / l, the etching becomes excessive, so that the resin film also becomes difficult to deposit on the metal surface, the corrosion resistance decreases, and the slipperiness becomes insufficient.

Examples of the polyvalent anion polyvalent anion, condensed phosphoric acid (pyrophosphoric acid, metaphosphoric acid, hexametaphosphate, tripolyphosphate, etc. tetralin acid), molybdic acid, tungstic acid, phosphomolybdic acid, phosphotungstic acid, silicotungstic acid And salts thereof. The content of the polyvalent anion with respect to the metal surface treating agent is preferably from 0.003 g / l to 10 g / l, more preferably from 0.01 g / l to 5 g / l. When the content of the polyvalent anion is less than 0.003 g / l, the metal surface is insufficiently etched, the resin film is less likely to be deposited on the metal surface, the corrosion resistance is poor, and the slipperiness is reduced. On the other hand, when the content of the polyvalent anion exceeds 10 g / l, the stability of the treatment liquid is reduced, and the corrosion resistance and the slipperiness are also reduced. Here, the treatment liquid refers to a metal surface treatment agent according to the present invention or a liquid appropriately diluted with water.

Oxidizing agent The oxidizing agent has the effect of promoting the chemical stabilization of the metal surface or the densification and uniformity of the resin film, and is added to the metal surface treating agent according to the present invention in order to improve the corrosion resistance. May be. Examples of the oxidizing agent include hydrogen peroxide, nitrous acid, nitrite, perboric acid, perborate, chloric acid, chlorate, bromate, bromate, and the like, preferably hydrogen peroxide, nitrite. It is. The content of the oxidizing agent with respect to the metal surface treating agent is preferably 10 g / l or less. When the content of the oxidizing agent exceeds 10 g / l, the effect as the oxidizing agent is reduced, which is uneconomical.

Heavy Metal The metal surface treating agent of the present invention may contain a heavy metal,
As heavy metals, Zr, Nb, Ni, Co, Mn, T
It is at least one of i, Ta, Mo, and W, and is preferably a complex fluoride of the above metal, and further includes nitrate, phosphate and the like. The content of the heavy metal with respect to the metal surface treating agent is preferably less than 10 g / l. When the content of the heavy metal exceeds 10 g / l, the corrosion resistance, coating film adhesion, and slipperiness decrease.

Treatment Conditions and Treatment Method The metal surface treating agent has a pH of about 2.0 to 5.0, preferably 2.5 to 4.0. At this time, the pH is adjusted with NaOH, an aqueous ammonia solution, nitric acid or the like. The contact temperature between the metal surface treating agent of the present invention and the metal material is preferably room temperature (for example, 20 ° C.) to 90 ° C., and more preferably 35 to 65 ° C. Generally, the contact time between the metal material and the metal surface treating agent according to the present invention becomes shorter as the contact temperature becomes higher.

In the case of spray application to a metal material, the time is about 5 to 5 minutes, preferably 10 to 60 seconds. When using the immersion method, a contact time longer than the above contact time is required. In addition, the contact may be performed by a dipping method, a flow coating method, or a roll coating method.

As described above, the metal material which has been subjected to the chemical conversion treatment is washed with water and subjected to a drying step.
When the drying temperature is lower than 150 ° C, the corrosion resistance is poor.

The mechanism of the deposition of the organic polymer compound of the present invention on a metal surface will be described below. In an acidic aqueous solution, when the organic polymer compound contains a nitrogen atom (derived from an amine), it exhibits cationicity. Then, the cationic property is lost due to a rise in the pH of the metal interface when the metal is etched, and the organic polymer compound is coagulated and deposited on the metal surface. Furthermore, this nitrogen atom loan pair (lone electron pair)
Is also shared with the metal (chelation), thereby causing precipitation of the resin on the metal.

The metal material for which the metal surface treatment method of the present invention is used includes, in addition to aluminum and aluminum alloy, iron, zinc, zinc alloy, tin plated plate, stainless steel and the like.

Further, other preferred embodiments of the present invention will be described below.

1. Water-soluble, water-dispersible or emulsifying forms in the metal surface treatment agent, organic polymer compounds containing at least one nitrogen atom, epoxy resin, acrylic resin, urethane resin, phenol resin, It is a compound having at least one resin skeleton of an olefin resin or an amide resin.

2. The content of the organic polymer compound relative to the metal surface treating agent is 0.01 to 10 g / l.

3. The content of the organic polymer compound with respect to the metal surface treatment agent is 0.1 to 5 g / l.

4. The inorganic acid contained in the metal surface treating agent according to the present invention is phosphoric acid.

5. The concentration of phosphoric acid with respect to the metal surface treating agent is 0.05 g / l to 0.95 g / l.

6. Preferably, the concentration of phosphoric acid relative to the metal surface treatment agent is between 0.25 g / l and 5 g / l.

7. The source of aluminum ions contained in the metal surface treatment agent according to the present invention is aluminum nitrate,
When the treated metal is an aluminum alloy material, aluminum hydroxide, aluminum fluoride, or aluminum eluted by etching may be used.

8. The content of the aluminum ion with respect to the metal surface treatment agent is 0.01 g / l to 0.5 g / l.
It is.

9. Preferably, the content of the aluminum ion with respect to the metal surface treatment agent is 0.05 g / l to
0.2 g / l.

10. The metal surface treating agent according to the present invention contains the following etching agent, etching aid, polyvalent anion, oxidizing agent, and heavy metal as necessary.

11. Heavy metals are Zr, Nb, Ni, C
At least one of o, Mn, Ti, Ta, Mo, and W.

12. The heavy metal is the complex fluoride.

13. The content of the heavy metal with respect to the metal surface treating agent is less than 10 g / l.

14. The etching agent is a fluoride ion.

15. The source of the fluoride ions is hydrofluoric acid or a salt thereof.

16. The content of the fluoride ion with respect to the metal surface treating agent is 0.005 g / l to 2 g / l.

17. The etching aid is silicic acid, fluorinated acid or a salt thereof.

18. The content of the etching aid with respect to the metal surface treatment agent is 0.003 g / l to 5 g / l.

19. The polyvalent anion is at least one of condensed phosphoric acid pyrophosphoric acid, metaphosphoric acid, hexametaphosphoric acid, tripolyphosphoric acid, tetraphosphoric acid, or molybdic acid, tungstic acid, phosphomolybdic acid, phosphotungstic acid, silicotungstic acid or a salt thereof. Is a seed.

20. The content of the polyvalent anion with respect to the metal surface treating agent is 0.01 g / l to 5 g / l.

21. The content of the polyvalent anion with respect to the metal surface treating agent is 0.1 g / l to 2 g / l.

22. The oxidizing agent includes hydrogen peroxide, nitrous acid (salt), perboric acid (salt), chloric acid (salt), and bromic acid (salt).
Any one of the following.

23. The content of the oxidizing agent with respect to the metal surface oxidizing agent is 10 g / l or less.

24. PH of the metal surface treatment agent according to the present invention
Is from 2.5 to 4.0.

25. The pH adjustment is performed using any one of NaOH, an aqueous ammonium solution, and nitric acid.

[0064]

Next, the present invention will be described in detail with reference to examples and comparative examples. Note that the present invention is not limited by these examples.

Examples 1 to 7 and Comparative Examples 1 and 2 (1) Object to be treated: Al-Mn system (JIS-A3004)
Molded cans obtained by DI processing of aluminum alloy plate.

(2) Method for evaluating coating undercoating: a) Blackening resistance to boiling water (corrosion resistance): An object to be treated which had been surface-treated with the compositions of the present example and comparative examples was immersed in boiling tap water for 30 minutes. Later appearance evaluation was performed according to the following criteria.

: No change in appearance △: slight blackening ×: blackening b) Slipperiness of the surface of the coating undercoating film: “HEIDON-14” was subjected to the chemical conversion treatment by the method of this example. 5mmφ steel ball, load 50g, stylus speed 300mm with die tester
/ Min. The dynamic friction coefficient was obtained from.

：: less than 0.55 △: 0.55 to 0.8 ×: more than 0.8 c) Coating adhesion: paint (EB-70-001N 150 mmg / m ² , manufactured by BASF) using a bar coater Clear: EB-69-002N 60 mmg / m ² ) is applied to the object. Then, the coated workpiece was subjected to wedge-pending processing, and the peeling evaluation of the coating when the bent portion was peeled off with a Nichiban cellotape was performed according to the following criteria.

：: Tape peel length of less than 15 mm Δ: Tape peel length of 15 to 20 mm ×: Tape peel length of more than 20 mm (3) Metal surface treatment conditions; <Example 1> Al-Mn ( JIS-A3004) A molded can was prepared by using an acidic degreasing agent ("Surf Cleaner NHC250" manufactured by Nippon Paint Co., Ltd.) at a concentration of 30 g / l at 75 ° C and 60 ° C.
After spray degreasing for 2 seconds, wash with water, phosphoric acid 0.5g / l,
0.5 g / l hydrofluoric acid, pyrophosphoric acid, aluminum ion, spray-forming at 50 ° C. for 20 seconds with a metal surface treatment agent containing the above-mentioned (a) amine-modified polyvinylphenol resin as an organic polymer compound and adjusted to pH 3.5. Processing was performed. After the treatment, it was washed with water, dried at 190 ° C. for 3 minutes, and dried. Table 1 shows the evaluation results.

<Examples 2 to 7, Comparative Examples 1 and 2> As shown in Table 1, the type, content, phosphate ion concentration, aluminum ion concentration, and pH of the organic polymer compound were changed.
The contents of the other components were the same metal surface treatment agents as in Example 1, and the surface treatment was performed in accordance with Example 1.
Table 1 shows the evaluation results.

[0071]

[Table 1] Note) (A): phenolic resin: resin represented by the following chemical formula (B): polyvinyl phenol resin: resin represented by the following chemical formula (C): (C): bisphenol A resin: resin represented by the following chemical formula (14) (D): Amine-modified cationic resin: HEA ^{* 1} / p-TBS ^{* 2} / DMAEA ^{* 3} = 40/30 /
30 Molecular weight 3000 * 1: HEA; hydroxyethyl acrylate * 2: p-TBS; para-t-butylstyrene * 3: DMAEA; N-dimethylaminoethyl acrylate

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Embedded image From these results, according to the metal surface treatment agent of the present invention,
It was found that even at a low phosphate ion concentration, the corrosion resistance (blackening resistance to boiling water), the slip property, the adhesion of the top coat, the appearance of the object to be treated, and the appearance of the treatment liquid were good.

[0072]

As described above, according to the metal surface treating agent and the treating method according to the present invention, the organic polymer compound contained in the metal surface treating agent forms an insoluble compound with aluminum ions. When the surface treatment agent contains aluminum ions, the deposition rate of the organic film on the metal surface can be accelerated. Therefore, the organic film can be deposited on the metal surface in the presence of phosphate ions at a lower concentration than before. Furthermore, since a dense and uniform organic film can be formed on the metal surface by the presence of aluminum ions, corrosion resistance, coating film adhesion, and slipperiness can be simultaneously satisfied. Moreover, since the phosphate ion concentration can be reduced, an environmentally friendly metal surface treatment agent can be provided.

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication // C09D 123/00 PEP C09D 123/00 PEP 133/04 PGB 133/04 PGB 161/06 PHF 161 / 06 PHF 163/00 PJE 163/00 PJE 175/04 PHM 175/04 PHM 177/00 PLS 177/00 PLS 201/00 PDC 201/00 PDC (72) Inventor Toshiaki Shimakura 4-chome Minamishinagawa, Shinagawa-ku, Tokyo 1-15 Japan Paint Co., Ltd. Tokyo Office (72) Inventor Kiyotada Yasuhara 4-1-1 Minami Shinagawa, Shinagawa-ku, Tokyo Japan Paint Co., Ltd. Tokyo Office

Claims (4)

[Claims] An organic polymer compound having at least one nitrogen atom or a salt thereof having a water-soluble, water-dispersible or emulsion form; 0.01 to 10 g / l,
A metal surface treatment agent comprising: phosphate ions; 0.01 to 0.8 g / l; aluminum ions; 0.01 to 0.5 g / l. 2. The metal surface treating agent according to claim 1, wherein the organic polymer compound is at least one of an epoxy resin, an acrylic resin, a urethane resin, a phenol resin, an olefin resin, and an amide resin. A metal surface treatment agent, which is a compound having at least one kind of resin skeleton, and wherein at least one of the organic polymer compounds has a functional group represented by the following chemical formula (1) or (2). Embedded image (Wherein, R ₁ and R _{2 are} hydrogen, a hydroxyl group, a linear or branched alkyl group having 1 to 10 carbon atoms, or a linear or branched alkyl group having 1 to 10 carbon atoms which may be substituted). Alkanol group) (Wherein, R ₃ , R ₄ , R ₅ : hydrogen, hydroxyl group, carbon number 1 to 1)
10 substituted or unsubstituted linear or branched alkyl groups or substituted or unsubstituted linear or branched alkanol groups having 1 to 10 carbon atoms) 3. A method for treating a metal surface, comprising bringing the metal surface treating agent according to claim 1 into contact with a metal surface, followed by washing with water and drying. 4. A surface-treated metal material which has been surface-treated using the metal surface treatment agent according to claim 1.