Technique for preparing cerium corrosion-resistant film on surface of aluminum alloy

A technology of aluminum alloy surface and preparation process, applied in the direction of metal material coating process, etc., can solve the problems of non-dense corrosion-resistant film layer, high temperature required, long processing time, etc., achieve fast film forming speed and reduce corrosion current , the effect of high deposition rate

Inactive Publication Date: 2011-06-29
OCEAN UNIV OF CHINA
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Problems solved by technology

However, judging from the current process, there are still many imperfections, such as long processing time, high temperature required, complicated process, and not dense corrosion-resistant film layer, etc.

Method used

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  • Technique for preparing cerium corrosion-resistant film on surface of aluminum alloy
  • Technique for preparing cerium corrosion-resistant film on surface of aluminum alloy
  • Technique for preparing cerium corrosion-resistant film on surface of aluminum alloy

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Embodiment 1

[0021] Preparation of Cerium Corrosion-resistant Film on Surface of 1060 Aluminum Alloy

[0022] First, the surface of 1060 aluminum alloy is pretreated. The steps are: polish the aluminum alloy with water-resistant sandpaper until it is bright, and rinse it with deionized water; soak it in a weak alkaline aqueous solution for 4 minutes at room temperature and then rinse it with deionized water. The alkaline aqueous solution contains 50 g / L of sodium phosphate, 10 g / L of sodium hydroxide, and 30 g / L of sodium silicate. Rinse with deionized water after soaking in alkaline aqueous solution at 50°C for 3 minutes, the alkaline aqueous solution contains sodium hydroxide 50g / L; Rinse with water.

[0023] Subsequently, the pretreated 1060 aluminum alloy was immersed in the cerium salt conversion liquid, and reacted at room temperature for 5 minutes. The components in the cerium salt conversion solution are: 40 g / L of cerous chloride hydrate, 50 g / L of hydrogen peroxide, 80 g / L of s...

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Abstract

The invention relates to a technique for preparing a cerium corrosion-resistant film on the surface of aluminum alloy, which is characterized by comprising the following steps: carrying out surface pretreatment on aluminum alloy; immerging the aluminum alloy in a cerium salt conversion liquid to form a film; taking out the aluminum alloy, washing with deionized water, and immerging the aluminum alloy in a phosphate water solution to carry out after-treatment; and washing with deionized water, and drying. The invention has the advantages of high film-forming speed and high deposition rate, and effectively shortens the reaction time. The prepared corrosion-resistant film mainly comprises quadrivalent phosphates of cerium, and the film is uniform and compact; and after the cerium corrosion-resistant film is formed on the surface of the aluminum alloy, the corrosion resistance of the aluminum alloy is obviously enhanced.

Description

technical field [0001] The invention relates to a process for preparing a corrosion-resistant film on the surface of an aluminum alloy, in particular to a process for preparing a cerium-resistant film on the surface of an aluminum alloy. Background technique [0002] Aluminum alloy has low density, excellent strength and plasticity, and is widely used in mechanical manufacturing. A layer of oxide film can be naturally formed on the surface of aluminum alloy to play a protective role. However, the naturally formed oxide film is very thin, and aluminum alloys are prone to intergranular corrosion in the atmosphere, and localized corrosion such as pitting corrosion is also prone to occur in environments rich in active anions, which have caused huge economic losses to the society. [0003] The protection methods commonly used at present are anodic oxidation, chromate chemical oxidation and organic coating. However, anodic oxidation will affect the mechanical properties of the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C23C22/83
Inventor 王昕宫承鹏刘浩泉许继辉
Owner OCEAN UNIV OF CHINA
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