CN108893766A - Improve the one-component medium temperature hole sealing agent and method for sealing of aluminium alloy salt spray resistance - Google Patents
Improve the one-component medium temperature hole sealing agent and method for sealing of aluminium alloy salt spray resistance Download PDFInfo
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- CN108893766A CN108893766A CN201810502701.3A CN201810502701A CN108893766A CN 108893766 A CN108893766 A CN 108893766A CN 201810502701 A CN201810502701 A CN 201810502701A CN 108893766 A CN108893766 A CN 108893766A
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- aluminium alloy
- hole sealing
- sealing
- medium temperature
- spray resistance
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
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Abstract
The present invention relates to sealing of holes after the anodic oxidation of aluminium alloy, more specifically, it relates to improve the one-component medium temperature hole sealing agent and method for sealing of aluminium alloy salt spray resistance.Its key points of the technical solution are that：Including following components and its weight proportion：Nickel salt 75-80%, polyvinyl alcohol 10-15%, sodium metasilicate 2-3%, sodium chloride or sodium acetate or sodium benzoate 5-6%, surfactant 1-2%, silane coupling agent 0.2-0.5%.Medium temperature hole sealing agent is more simple in operation based on one-component, and the composition in tank liquor is not easy unbalance, and 72 hours copper accelerates salt mist experiment to reach 9.5 grades or more.
Description
Technical field
The present invention relates to sealing of holes after the anodic oxidation of aluminium alloy, more specifically, it relates to improve aluminium alloy salt fog resistance
The one-component medium temperature hole sealing agent and method for sealing of energy.
Background technique
Current medium temperature sealing of hole is usually the sealing of hole at 60-65 DEG C, and energy consumption is higher, or using 90 DEG C or more of high temperature envelope
Hole solves the problems, such as salt mist experiment, then energy consumption greatly improves.Standard GB/T 5237.2-2008 is shown, for 15 μm of conventional sun
Pole oxidation film, copper accelerates salt mist experiment that should reach 9 grades or more within 48 hours.Due to the use environment of aluminium alloy, 48 is small
When copper accelerate salt mist experiment to have been unable to meet customer requirement, copper accelerates salt mist experiment that need to reach 9.5 grades or more within 72 hours.Mesh
Preceding common medium temperature hole sealing agent is difficult to meet.
While improving salt mist experiment requirement, otherwise test must also pass through in national standard.
Meanwhile there is solid hole sealing agent and liquid hole sealing agent, the two based on two-component in medium temperature hole sealing agent in the market
Collocation uses, increasingly complex in operation, and the composition in tank liquor is easier to unbalance, leads to sealing of hole problem.
Therefore it needs to propose the new scheme of one kind to solve this problem.
Summary of the invention
In view of the deficienciess of the prior art, the purpose of the present invention one is to provide a kind of raising aluminium alloy salt spray resistance
One-component medium temperature hole sealing agent, aluminium alloy after anodic oxidation can significantly improve anode oxide film after hole sealing agent processing
Salt spray resistance, enable aluminum alloy to can have stronger corrosion resistance under marine climate.
Above-mentioned technical purpose one of the invention technical scheme is that：Improve aluminium alloy salt fog resistance
The one-component medium temperature hole sealing agent of energy, including following components and its weight proportion：
Nickel salt：75-80%
Polyvinyl alcohol：10-15%
Sodium metasilicate：2-3%
Sodium chloride or sodium acetate or sodium benzoate：5-6%
Surfactant：1-2%
Silane coupling agent：0.2-0.5%.
By using above-mentioned technical proposal, sodium metasilicate main function is to improve salt mist experiment in the present invention, while meta-alkalescence
The pH value that tank liquor can be stablized is replaced with other compositions and has an impact to salt mist experiment.Hole sealing agent made from above-mentioned formula after tested
Aluminium alloy after handling anodic oxidation significantly improves the salt spray resistance of anode oxide film, and copper accelerates salt mist experiment equal within 72 hours
Reach 9.5 grades or more.
The present invention is further arranged to：The nickel salt is nickel acetate or nickel acetate and nickel sulfate mixing nickel salt.
By using above-mentioned technical proposal, be conducive to control cost, and sulphur using nickel acetate and nickel sulfate mixing nickel salt
The content of sour nickel is not also high, will not have apparent side effect to tank liquor aging.
The present invention is further arranged to：The polyvinyl alcohol is the polymer of vinylacetate and vinyl alcohol, polyvinyl alcohol
Molecular weight is 2.5-3.5 ten thousand, and alcoholysis degree is 98%.
By using above-mentioned technical proposal, the degree of polymerization increases, and solution viscosity increases, the intensity and solvent resistance after film forming
It improves, different alcoholysis degrees is different in dissolubility, and viscosity is different, too viscous to will affect sealing of hole effect, or even the aluminium after sealing of hole
Material surface has been easy ash.The present invention use the above degree of polymerization and alcoholysis degree polyvinyl alcohol, aluminum alloy surface film forming after intensity and
Solvent resistance is high, nor can significantly affect sealing of hole effect.
The present invention is further arranged to：The surfactant is neopelex, lithium dodecyl sulfate.
By using above-mentioned technical proposal, both surfactants are more economical from cost consideration, and both tables
Face activating agent does not allow to be also easy to produce after heating foam, and frothy words can be adhered to cleaning dirty on profile, influences appearance.
The present invention is further arranged to：The silane coupling agent selects aminomethoxy one type of silane.
By using above-mentioned technical proposal, amino and ethyoxyl are respectively intended to coupling organic polymer and inorganic filler, increase
Its strong caking property improves the performances such as mechanical, electrical, water-fast, anti-aging of product.Excellent adhesive accelerant can improve pigment
Dispersibility and improve to glass, aluminium, ferrous metal adhesiveness.And comprehensively consider water solubility, the stability at specific PH,
With the compatibilities of other raw materials, cost, whether have other side effects and other effects more preferable.
The present invention is further arranged to：The silane coupling agent selection 3- aminopropyl trimethoxysilane or N- (2- ammonia second
Base) -3- aminopropyl triethoxysilane.
By using above-mentioned technical proposal, water solubility, the stability at specific PH, the phase with other raw materials are comprehensively considered
Whether capacitive, cost have other side effects, three ethoxy of 3- aminopropyl trimethoxysilane and N- (2- aminoethyl) -3- aminopropyl
The effect of base silane is more preferable.
The purpose of the present invention two is to provide a kind of method for sealing, and the aluminium alloy after anodic oxidation passes through the sealing pores
Afterwards, the salt spray resistance that can significantly improve anode oxide film enables aluminum alloy to can have stronger corrosion resistance under marine climate.
Above-mentioned technical purpose two of the invention technical scheme is that：A kind of method for sealing, including
Following steps：
S1. the one-component medium temperature hole sealing agent that aluminium alloy salt spray resistance is improved described in above scheme is made into deionized water
Hole sealing solution, the concentration of hole sealing agent are 8-10 grams per liter, and solution temperature is 50-55 DEG C, and hole sealing solution pH value is adjusted to 5.5-
5.9；
S2. the aluminium alloy to sealing of hole is put into the hole sealing solution in S1 and impregnates 16-18 minutes progress sealing of holes.
The present invention is further arranged to：The pH value of hole sealing solution is adjusted by glacial acetic acid or triethanolamine in S1.
By using above-mentioned technical proposal, glacial acetic acid is cheap, while risk is low, in addition contains acetic acid in hole sealing agent
Nickel contains acetate, be free from side effects so glacial acetic acid is added, and the effect for reducing PH is obvious.Triethanolamine is alkali
Property, it can be used for adjusting upward pH value, while triethanolamine is also the complexing agent of nickel salt, nickel ion can be stablized, prevent nickel heavy
It forms sediment, and at low cost, there is no any side effect to sealing of hole.
In conclusion the invention has the advantages that：
First, aluminium alloy is after anodic oxidation and washing, into sealing of hole in 50-55 DEG C of sealing of hole slot.Sealing of hole basis of time sun
The thickness of pole oxidation film determines that general every micron of 1-1.5 minutes film thickness sealing of hole time, the effect of sealing of hole is the salt for generating aluminium and nickel
Substance makes anode oxide film have stronger smoothness, resistance to acid and alkali, anti-dye performance and wearability etc..
Second, tested after measuring is completed 120 hours with hole sealing agent sealing of hole of the present invention using copper accelerated acetic acid salt spray,
Reach 10 grades within 72 hours, greatly improves aluminium alloy salt spray resistance；Required tank liquor temperature is relatively low when sealing of hole, advantageously reduces
Energy consumption.
Third, using nickel salt as main component, then other helper components are added, more simple in operation, the composition in tank liquor
It is not easy unbalance, aluminum alloy surface situation is shown after sealing of hole, the smooth no stain in surface, no sealing of hole pollen, anodic oxidation film outward appearance
Unchanged, crystal violet detects surface without specking, and weightless result also complies with the requirement of national standard.
Specific embodiment
Silane coupling agent hereinafter can select 3- aminopropyl trimethoxysilane, 3- aminopropyl triethoxysilane,
N- (2- aminoethyl) -3- aminopropyl trimethoxysilane, N- (2- aminoethyl) -3- aminopropyl triethoxysilane, preferably 3-
Aminopropyl trimethoxysilane or N- (2- aminoethyl) -3- aminopropyl triethoxysilane, below with N- (2- aminoethyl) -3- ammonia
For propyl-triethoxysilicane.
Below with reference to table and embodiment, the present invention will be described in detail.
The one-component medium temperature hole sealing agent for improving aluminium alloy salt spray resistance, weighs to obtain according to following components and weight proportion
Each embodiment in following table, wherein polyvinyl alcohol molecule amount is 2.5-3.5 ten thousand, and alcoholysis degree is 98%.Specifically it see the table below：
Embodiment 8
Improve the one-component medium temperature hole sealing agent of aluminium alloy salt spray resistance, embodiment 8 and embodiment 2 the difference is that, gather
Vinyl alcohol molecular weight is 180,000.
Embodiment 9
Improve the one-component medium temperature hole sealing agent of aluminium alloy salt spray resistance, embodiment 9 and embodiment 2 the difference is that, gather
Vinyl alcohol alcoholysis degree 88%.
Embodiment 10
Improve the one-component medium temperature hole sealing agent of aluminium alloy salt spray resistance, embodiment 9 and embodiment 2 the difference is that, it is real
The mixture that the nickel acetate in example 2 replaces with nickel acetate and nickel sulfate is applied, wherein the weight ratio of nickel acetate and nickel sulfate is 1:1.
Embodiment 11
A kind of method for sealing, includes the following steps：
S1. the one-component medium temperature hole sealing agent that aluminium alloy salt spray resistance is improved described in embodiment 1-10 is used into deionization respectively
Water is made into hole sealing solution, and the concentration of hole sealing agent is 8 grams per liters, and solution temperature is 50 DEG C, and by hole sealing solution pH value glacial acetic acid tune
Section is 5.5；
S2. the aluminium alloy to sealing of hole is put into the hole sealing solution in S1 and impregnates 18 minutes progress sealing of holes.
Salt mist experiment, surface are carried out to aluminium alloy according to the method for embodiment 11 to the hole sealing agent made from embodiment 1-10
Visual examination, phosphorus chromic acid weightless test crystal violet detection and presoaked after 120 hours through pernitric acid, test result see the table below：
It is tested and is found by above table, 72 hours copper of embodiment 1-3 and embodiment 10 accelerate salt mist experiment to reach 9.5 grades
More than, solve the problems, such as salt mist experiment.Wherein 72 hours copper of embodiment 2, embodiment 3 and embodiment 10 accelerate salt mist experiment to reach
To 10 grades, demand of the aluminium alloy to more use environments is met.And using the aluminium alloy table after embodiment 1-10 sealing of hole
The smooth no stain in face, no sealing of hole pollen, anodic oxidation film outward appearance are unchanged, and crystal violet detects rear surface also without specking.To implementation
The phosphorus chromic acid weightless test that example 1- embodiment 10 presoaks after carrying out 120 hours through pernitric acid, it is weightless to be all far smaller than 30mg/dm2。
Furthermore the present invention is also tested for the sealing of hole speed of embodiment 1-3 and embodiment 10, and sealing of hole speed all 2 μm of >/
Min, sealing of hole speed are conducive to improve sealing of hole efficiency fastly, save the time.
The various aspects test performance of embodiment 2 is the most excellent, therefore the further method for sealing of research embodiment 2.
Embodiment 12
A kind of method for sealing, embodiment 12 and embodiment 11 are the difference is that the concentration of hole sealing agent is 10 grams per liters.
Embodiment 13
A kind of method for sealing, embodiment 13 and embodiment 11 are the difference is that solution temperature is 53 DEG C.
Embodiment 14
A kind of method for sealing, embodiment 14 is with embodiment 13 the difference is that hole sealing solution pH value is adjusted to glacial acetic acid
5.65。
Embodiment 15
A kind of method for sealing, after embodiment 15 and embodiment 14 are the difference is that hole sealing solution pH value adjusted with nickel acetate
It is adjusted again with triethanolamine to 5.75.
Using after embodiment 12-15 sealing of hole aluminium alloy carry out salt mist experiment, appearance inspection, crystal violet detection and
The phosphorus chromic acid weightless test presoaked after 120 hours through pernitric acid, test result see the table below：
Various aspects of performance is all fine when caning be found that hole sealing agent concentration is 8 grams per liter by upper table, and does not allow to easily cause wave
Take；Sealing of hole speed is further speeded up when solution temperature is 53 DEG C, is conducive to improve sealing of hole efficiency；Embodiment 14 and embodiment 15 are made
The hole sealing solution pH value obtained is promoted, and the phosphorus chromic acid through pernitric acid preimpregnation after 120 hours is weightless less, and uses triethanolamine
Adjusting there will not be any influence, not have any side effect to sealing of hole.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. improving the one-component medium temperature hole sealing agent of aluminium alloy salt spray resistance, characterized in that match including following components and its weight
Than：
Nickel salt：75-80%
Polyvinyl alcohol：10-15%
Sodium metasilicate：2-3%
Sodium chloride or sodium acetate or sodium benzoate：5-6%
Surfactant：1-2%
Silane coupling agent：0.2-0.5%.
2. the one-component medium temperature hole sealing agent according to claim 1 for improving aluminium alloy salt spray resistance, characterized in that described
Nickel salt is nickel acetate or nickel acetate and nickel sulfate mixing nickel salt.
3. the one-component medium temperature hole sealing agent according to claim 1 for improving aluminium alloy salt spray resistance, characterized in that described
Polyvinyl alcohol is the polymer of vinylacetate and vinyl alcohol, and polyvinyl alcohol molecule amount is 2.5-3.5 ten thousand, and alcoholysis degree is 98%.
4. the one-component medium temperature hole sealing agent according to claim 1 for improving aluminium alloy salt spray resistance, characterized in that described
Surfactant is neopelex, lithium dodecyl sulfate.
5. the one-component medium temperature hole sealing agent according to claim 1 for improving aluminium alloy salt spray resistance, characterized in that described
Silane coupling agent selects aminomethoxy one type of silane.
6. the one-component medium temperature hole sealing agent according to claim 1 for improving aluminium alloy salt spray resistance, characterized in that described
Silane coupling agent selects 3- aminopropyl trimethoxysilane or N- (2- aminoethyl) -3- aminopropyl triethoxysilane.
7. a kind of method for sealing, characterized in that include the following steps：
S1. the one-component medium temperature hole sealing agent that aluminium alloy salt spray resistance is improved described in any one of claim 1-6 is used
Deionized water is made into hole sealing solution, and the concentration of hole sealing agent is 8-10 grams per liter, and solution temperature is 50-55 DEG C, and by hole sealing solution pH
Value is adjusted to 5.5-5.9；
S2. the aluminium alloy to sealing of hole is put into the hole sealing solution in S1 and impregnates 16-18 minutes progress sealing of holes.
8. a kind of method for sealing according to claim 7, characterized in that the pH value of hole sealing solution is by glacial acetic acid or three in S1
Ethanol amine adjustment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810502701.3A CN108893766B (en) | 2018-05-23 | 2018-05-23 | Improve the one-component medium temperature hole sealing agent and method for sealing of aluminium alloy salt spray resistance |
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| CN201810502701.3A CN108893766B (en) | 2018-05-23 | 2018-05-23 | Improve the one-component medium temperature hole sealing agent and method for sealing of aluminium alloy salt spray resistance |
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| CN108893766A true CN108893766A (en) | 2018-11-27 |
| CN108893766B CN108893766B (en) | 2019-08-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913926A (en) * | 2019-04-17 | 2019-06-21 | 安徽华淮新材料有限公司 | Aluminium alloy anode oxide film hole sealing agent and its method for sealing |
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Cited By (1)
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| CN109913926A (en) * | 2019-04-17 | 2019-06-21 | 安徽华淮新材料有限公司 | Aluminium alloy anode oxide film hole sealing agent and its method for sealing |
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