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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

Inactive Publication Date: 2012-10-03
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the number of public reports on the sealing treatment of micro-arc oxidation coatings is very limited, and the coverage is very small, which cannot meet the application requirements of actual components.

Method used

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  • Microarc-oxidized coating silylation fluid and hole sealing method thereby
  • Microarc-oxidized coating silylation fluid and hole sealing method thereby
  • Microarc-oxidized coating silylation fluid and hole sealing method thereby

Examples

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Effect test

Embodiment 1

[0032] Taking epoxy silane coupling agent KH-560 (γ-(2,3-glycidoxy)propyltrimethoxysilane) as an example to describe the method of sealing pores of aluminum alloy micro-arc oxidation coating by silanization treatment Implementation process.

[0033] ① Preparation of hydrolysis solution: add 60ml of methanol to 180ml of deionized water, place on a magnetic stirrer and stir evenly, then add 60ml of silane coupling agent KH-560, stir evenly; add dropwise acetic acid to adjust the pH value of the solution to 5, Ultrasonic vibration was used for 30 minutes to make the solution uniformly mixed; the above solution was left to stand at room temperature for 72 hours to prepare 300 ml of a hydrolyzed solution with a silane coupling agent concentration of 20%;

[0034] ② Put the aluminum alloy micro-arc oxidation coating sample with a size of 50×50×5mm into the above-mentioned silane hydrolysis solution for 20 minutes, take it out and air dry it in the air;

[0035] ③After the sample is...

Embodiment 2

[0040] Taking aminosilane coupling agent KH-550 (γ-aminopropyltriethoxysilane) as an example to describe the implementation process of sealing holes in magnesium alloy MAO coating by silanization treatment.

[0041] The volume ratio of water, ethanol, and KH-550 is prepared as 6:1:1, that is, a hydrolysis solution with a silane coupling agent concentration of 12.5%, and a silane film is 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 neutral salt spray corrosion resistance time of the magnesium alloy micro-arc oxidation coating is increased by more than 3 times.

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Abstract

The invention provides microarc-oxidized coating silylation fluid and a hole sealing method thereby. The hole sealing method by the microarc-oxidized coating silylation fluid includes: firstly, mixing deionized water, alcohol and silane coupling agent according to a volume ratio of 3-6:1:1, and adjusting pH value to obtain the microarc-oxidized coating silylation fluid; secondly, hydrolyzing the microarc-oxidized coating silylation fluid for more than 12 hours to obtain silane coupling agent hydrolyzed solution; thirdly, soaking microarc-oxidized coating in the silane coupling agent hydrolyzed solution for 19s to 20min, taking out the coating for air drying to obtain coating with absorbed hydrolyzed solution; and fourthly, heating and solidifying the coating with absorbed hydrolyzed solution at 50-300 DEG C for 15-300 minutes. The microarc-oxidized coating is silylated by the soaking-solidifying method, the process is simple, cost is low, and the hole sealing method by the microarc-oxidized coating silylation fluid is applicable to hole sealing of microarc-oxidized coatings of magnesium alloy, aluminum alloy and titanium alloy.

Description

technical field [0001] The invention relates to a surface treatment technology for in-situ generation of a ceramic coating on a valve metal surface. Specifically, it is a silanization treatment solution for sealing pores of micro-arc oxidation coating. The invention also relates to a method for sealing pores by silylation treatment liquid. Background technique [0002] Micro-arc oxidation is a surface treatment technique for in-situ generation of ceramic coatings on valve metal surfaces. This ceramic coating usually consists of the oxide of the base material itself and provides protection for the base material. This technology is suitable for surface protection treatment of aluminum, magnesium, titanium and other metals and their alloys. Micro-arc oxidation has the advantages of low pretreatment requirements, simple process, no pollution to the environment and excellent coating performance. It can significantly improve the corrosion resistance of materials, and can also g...

Claims

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Application Information

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IPC IPC(8): C23C22/48C25D11/02
Inventor 王艳秋房爱存石世瑞邵亚薇张涛孟国哲
Owner HARBIN ENG UNIV
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