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Preparation method of rapid in-situ growth ultra-thin wear-resistant coating on the surface of aluminum alloy special-shaped parts

An in-situ growth and wear-resistant coating technology, which is applied in anodic oxidation and other directions, can solve the problems of easy wear of the film layer, and achieve the effects of environmental protection, improved corrosion resistance, and excellent wear resistance

Active Publication Date: 2016-03-30
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the technical problem that the film layer obtained is easy to wear when the existing micro-arc oxidation technology is used to process LY12 aluminum alloy structural parts, and to provide ultra-thin and durable aluminum alloy special-shaped parts with rapid in-situ growth. Preparation method of abrasive coating

Method used

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  • Preparation method of rapid in-situ growth ultra-thin wear-resistant coating on the surface of aluminum alloy special-shaped parts
  • Preparation method of rapid in-situ growth ultra-thin wear-resistant coating on the surface of aluminum alloy special-shaped parts
  • Preparation method of rapid in-situ growth ultra-thin wear-resistant coating on the surface of aluminum alloy special-shaped parts

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specific Embodiment approach 1

[0024] Specific implementation mode 1: The preparation method of rapid in-situ growth of ultra-thin wear-resistant coating on the surface of aluminum alloy special-shaped parts according to this implementation mode is carried out according to the following steps:

[0025] 1. Surface pretreatment of LY12 aluminum alloy special-shaped parts: immerse LY12 aluminum alloy special-shaped parts in an aqueous solution of sodium hydroxide with a concentration of 35g / L-65g / L, keep it at a temperature of 50°C-60°C for 30s-60s, and take it out Rinse with clean water first, then rinse with distilled water, and dry;

[0026]2. Preparation of electrolyte: according to the main film-forming agent concentration of 10g / L-50g / L, the auxiliary film-forming agent concentration of 1g / L-10g / L, and the pH regulator concentration of 1g / L-5g / L, the reaction can be adjusted stably The agent concentration is 50ml / L~300ml / L, and the surfactant concentration is 0.1g / L~5g / L. Weigh the main film-forming agen...

specific Embodiment approach 2

[0029] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, LY12 aluminum alloy special-shaped parts are immersed in an aqueous sodium hydroxide solution with a concentration of 40g / L-60g / L, at a temperature of 55°C-58°C Hold down for 40s ~ 50s. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment differs from Embodiment 1 in that in Step 1, the special-shaped LY12 aluminum alloy is immersed in an aqueous sodium hydroxide solution with a concentration of 50 g / L, and kept at a temperature of 56° C. for 45 seconds. Others are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method for quick in-situ growth of an ultrathin wear-resisting coating on the surface of an aluminum alloy irregular part, relates to a preparation method of an aluminum alloy surface coating, and aims to solve the technical problem that the film obtained when parts of an LY12 aluminum alloy irregular part are treated by a micro-arc oxidation technology is easy to wear. The method comprises the following steps: I, surface pretreatment of the LY12 aluminum alloy irregular part; II, preparation of an electrolyte, wherein the electrolyte is prepared from a main film-forming agent, an auxiliary film-forming agent, potassium hydroxide, glycerol, polyethylene glycol 1000 and distilled water; III, micro-arc oxidation, wherein the ultrathin wear-resisting coating is quickly obtained on the surface of the LY12 aluminum alloy irregular part. The thickness of the film of the ceramic film is 5-15 mu m, the average friction coefficient of the film is 0.12-0.20, and the bonding strength of the film is 14-30MPa. The preparation method can be applied to structural connectors of spacecrafts.

Description

technical field [0001] The invention relates to a preparation method of an aluminum alloy surface coating. Background technique [0002] With the development of spacecraft in the fields of military, science, and life, its design gradually changes from single-function to multi-function, which makes the payload of spacecraft continue to increase. Therefore, the lightweight of spacecraft structural components is proposed. Higher requirements, seeking light and wear-resistant materials and corresponding technical means to solve the problem of periodic wear and tear of spacecraft structural components, in order to cope with the development concept of lightweight and large-scale spacecraft today. High-strength, low-density materials are the first choice for the design concept of spacecraft structures, as a benchmark for improving the efficiency of spacecraft structures. Among all structural materials, aluminum alloy is a light and low-cost metal with a low density (1.82g / cm 3 ),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D11/06
Inventor 吴晓宏李航李杨秦伟卢松涛
Owner HARBIN INST OF TECH
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