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Preparation process of cerium-doped silicon corrosion-resisting membrane on surface of aluminium 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 complex process, high temperature, poor compactness of corrosion-resistant film, etc., and achieve simple process, shortened film-forming time, and reduced corrosion current. Effect

Inactive Publication Date: 2011-04-20
OCEAN UNIV OF CHINA
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Problems solved by technology

But at present, the process still has some shortcomings: the preparation process requires high temperature, the process is relatively complicated, and the corrosion-resistant film is poor in compactness, so that the cerium corrosion-resistant film process needs to be further improved.

Method used

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  • Preparation process of cerium-doped silicon corrosion-resisting membrane on surface of aluminium alloy
  • Preparation process of cerium-doped silicon corrosion-resisting membrane on surface of aluminium alloy
  • Preparation process of cerium-doped silicon corrosion-resisting membrane on surface of aluminium alloy

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Embodiment 1

[0020] Formation of silicon-doped cerium corrosion-resistant film on the surface of 1060 aluminum alloy

[0021] Firstly, 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; wash it in acetone solution at room temperature for 4 minutes, and rinse it with deionized water after taking it out; 40℃ Soak it in an alkaline aqueous solution for 3 minutes, take it out and rinse it with deionized water. The alkaline aqueous solution contains 30 g / L of sodium hydroxide and 25 g / L of anhydrous sodium carbonate.

[0022] Then immerse the pretreated 1060 aluminum alloy in the cerium salt conversion liquid, and react at room temperature for 7 minutes. The configuration process of the cerium salt conversion liquid is as follows: 40g cerous chloride hydrate, 160g sodium perchlorate, 0.5g sodium benzoate and 0.5g benzotriazole are dissolved in 900g deionized water at roo...

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Abstract

The invention relates a preparation process of a cerium-doped silicon corrosion-resisting membrane on a surface of aluminium alloy. The preparation process is characterized in that surface pretreatment is carried out on aluminium alloy, and then the aluminium alloy is immersed in cerium salt conversion liquid dissolved with organosilicon, so as to carry out membrane formation reaction on the surface of the aluminium alloy, thus the corrosion-resisting membrane is formed; and then the aluminium alloy is taken out, is cleaned by deionized water and is dried. The invention has the advantages that the process is simple, the membrane formation speed is rapid, the preparation time of the corrosion-resisting membrane is shortened, the main constituents of the corrosion-resisting membrane layer are cerium dioxide and hydrated cerium oxide, and the uniformity and compactness of the surface of the membrane are good. After the cerium-doped silicon corrosion-resisting membrane is formed on the surface of the aluminium alloy, the corrosion resistance of the aluminium alloy is improved remarkably.

Description

technical field [0001] The invention relates to a preparation process of a corrosion-resistant film on the surface of an aluminum alloy, in particular to a preparation process of a silicon-doped cerium corrosion-resistant film on the surface of an aluminum alloy. Background technique [0002] Aluminum alloy has been widely used in the national economy due to its low density, strong electrical and thermal conductivity, excellent mechanical properties and good processability, as well as its abundant reserves in the earth's crust. As a metal with excellent performance, an oxide film composed of aluminum oxide or its hydrate can be naturally formed on the surface of aluminum alloy to protect the substrate. However, the natural oxide film is very thin, and aluminum alloys are prone to intergranular corrosion in the atmosphere, and local corrosion such as pitting corrosion is also prone to occur in an environment rich in active anions, which has caused huge economic losses to soci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C23C22/78
Inventor 王昕宫承鹏刘浩泉
Owner OCEAN UNIV OF CHINA
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