Microarc-oxidized coating silylation fluid and hole sealing method thereby
A technology of silanization treatment and micro-arc oxidation, which is applied in the direction of anodic oxidation and metal material coating technology, etc., can solve the problems of small coverage, inability to meet the application requirements of actual components, and limited number of micro-arc oxidation coating sealing treatments , to achieve the effect of low price, promotion of engineering application, and rich varieties
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[0031] Example 1:
[0032] Take epoxy silane coupling agent KH-560 (γ-(2,3-glycidoxy)propyltrimethoxysilane) as an example to describe the sealing of aluminum alloy micro-arc oxidation coating through silanization treatment Implementation process.
[0033] ①Prepare the hydrolysis solution: add 60ml of methanol to 180ml of deionized water, place it on a magnetic stirrer and stir evenly, then add 60ml of silane coupling agent KH-560 and stir evenly; add acetic acid dropwise to adjust the pH of the solution to 5. Use ultrasonic vibration for 30 minutes to make the solution uniformly mixed; the above solution is allowed to stand at room temperature for 72 hours to prepare 300 ml of a hydrolysis solution with a silane coupling agent concentration of 20%;
[0034] ②Put the aluminum alloy micro-arc oxidation coating sample with the size of 50×50×5mm into the above silane hydrolysis solution and soak for 20 minutes, and then dry it in the air after taking it out;
[0035] ③After the sample i...
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[0039] Example 2:
[0040] Take aminosilane coupling agent KH-550 (γ-aminopropyltriethoxysilane) as an example to describe the implementation process of sealing the magnesium alloy micro-arc oxidation coating through silanization treatment.
[0041] A hydrolysis solution with a volume ratio of water, ethanol and KH-550 of 6:1:1, that is, a silane coupling agent concentration of 12.5%, was prepared, and a silane film was prepared on the surface of the magnesium alloy micro-arc oxidation coating according to the steps described in Example 1. Experiments show that after the sealing treatment, the magnesium alloy micro-arc oxidation coating resistance to neutral salt spray corrosion time is increased by more than 3 times.
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