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Sealing agent for micro-arc oxidation film

A micro-arc oxidation and sealant technology, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of no more than 1 μm, pollution, unsatisfactory application effect, etc., and achieve good acid resistance and good permeability. , good antifouling effect

Inactive Publication Date: 2013-12-18
NANJING HAORANG ENVIRONMENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are unsatisfactory for the application of electronic product casings such as notebooks and mobile phone casings. After use, the surface of the product will lose the metallic texture after micro-arc oxidation. If no treatment is done, the micro-arc oxidation film may Loss of usability and / or aesthetics due to pitting and surface contamination
In addition, the thickness of the conventional surface sealing coating is 10-20 μm, which cannot meet the assembly accuracy requirements of occasions with high assembly requirements, such as aerospace components (the surface sealing coating should usually not exceed 1 μm)

Method used

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  • Sealing agent for micro-arc oxidation film
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of sealing agent: Take 5 parts of deionized water, add 90 parts of ethanol and stir for 2-3 minutes, then add 4 parts of γ-mercaptopropyltriethoxysilane and stir for 3-5 minutes, then add 1 part of WA-610, drop Add 40% glacial acetic acid to adjust the pH value to 9.5, stir for 5 minutes, and use it after standing for 24 hours.

[0021] Select a 6063 aluminum alloy specimen with a specification of 100mm×100mm×2mm, treat it with micro-arc oxidation for 20 minutes (the average film thickness is 15 μm), then clean it with deionized water, dry it at 80-100°C for 20 minutes, and then immerse it in the above sealant After 2-3 minutes, take it out, drain the residual liquid and put it in an oven at 150°C for 30 minutes to cure.

[0022] The product performance is tested and the following conclusions are drawn.

[0023] (1) Corrosion resistance: figure 1 It is the surface state of the 6063 aluminum alloy micro-arc oxidation test piece when the hole is not sealed a...

Embodiment 2

[0033] Preparation of sealing agent: Take 6.5 parts of deionized water, add 90 parts of methanol and stir for 2-3 minutes, then add 3 parts of γ-mercaptopropyltrimethoxysilane and stir for 3-5 minutes, then add 0.5 parts of WA-610 and stir for 1- After 2 minutes, add 40% glacial acetic acid dropwise to adjust the pH value to 4.5, and then use it after standing for 24 hours.

[0034] After the 5083 aluminum alloy specimen with a size of 100mm×50mm×2mm was micro-arc oxidized for 15 minutes (the average film thickness was 12 μm), it was cleaned with deionized water, dried at 80-100°C for 20 minutes, and then immersed in the above sealant for 2-3 minutes. , take it out, drain the residue and place it in an oven at 130°C for 40 minutes to cure.

[0035] The relevant test of processed product is carried out according to embodiment 1. There is no sensory change in the appearance of the micro-arc oxidation film before and after sealing; the salt spray test level exceeds 1000h; the an...

Embodiment 3

[0037] Preparation of sealing agent: Take 8 parts of deionized water, add 86 parts of methanol and stir for 2-3 minutes, then add 3 parts of γ-mercaptopropyltrimethoxysilane and 2 parts of γ-glycidyl etheroxypropyltrimethoxysilane and mix Stir for 3-5min, then add 1 portion of WA-610 and stir for 1-2min, add 40% glacial acetic acid dropwise to adjust the pH value to 4.5, leave it for 24h before use.

[0038] After micro-arc oxidation treatment of φ100mm×5mm ZL102 aluminum alloy casting for 25min (film thickness 20μm), clean it with deionized water, dry it at 80-100℃ for 20min, then immerse it in the above sealing agent for 2-3min, take it out and drain it The residual liquid was then placed in an oven at 130°C for 40 minutes to cure.

[0039] The relevant test of processed product is carried out according to embodiment 1. There is no sensory change in the appearance of the micro-arc oxidation film before and after sealing; the salt spray test level exceeds 1000h; the antifoul...

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Abstract

The invention discloses a sealing agent for a micro-arc oxidation film. Alcohols solvents and little additives are added to prepare water-soluble liquid on the basis of a silane coupling agent, and the sealing agent is used for generating a nanometer protective layer on the surface of the oxidation film, so that discharge micropores of the micro-arc oxidation film can be effectively sealed and good corrosion resistance is achieved; the sealed surface of the micro-arc oxidation film has a good hydrophobic effect, is anti-scrubbing and anti-pollution, is matte, transparent and traceless, and has no sensory difference in appearance compared with that before micropore sealing.

Description

technical field [0001] The invention belongs to the field of surface treatment of metal materials, and in particular relates to a sealing agent for micro-arc oxidation film, its preparation method and application. Background technique [0002] Lightweight is an important development direction in the field of materials and machinery. "Substituting aluminum for steel and magnesium for plastic" is an important way to achieve lightweight. At this stage, aluminum, magnesium and their alloys have been widely used in the fields of machinery, electric power, ships, aerospace and other fields, but the corrosion protection of these light metals is insufficient, which hinders their further application. [0003] The development of micro-arc oxidation technology has brought new opportunities for the application of light metals such as aluminum, magnesium and their alloys. Micro-arc oxidation technology can form a dense ceramic oxide film on the surface of light metals, thereby greatly i...

Claims

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Application Information

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IPC IPC(8): C25D11/02C25D11/24
Inventor 房爱存蒋百铃赵健房昊炜
Owner NANJING HAORANG ENVIRONMENT SCI & TECH
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