A method of improving the corrosion resistance of aluminum alloy surface

A technology of aluminum alloy surface and corrosion resistance, which is applied in the field of aluminum alloy, can solve the problems of hexavalent chromium toxicity, environmental pollution, and human injury, and achieve the effects of improving adhesion, prolonging protection time, and increasing service life

Active Publication Date: 2019-11-05
山东弘通建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional chromic acid conversion coatings have excellent corrosion resistance. However, hexavalent chromium is toxic, easily carcinogenic, harmful to the human body, and pollutes the environment. Therefore, more and more attention has been paid to environmentally friendly chromium-free chemical conversion coatings.

Method used

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  • A method of improving the corrosion resistance of aluminum alloy surface
  • A method of improving the corrosion resistance of aluminum alloy surface

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A method for improving the corrosion resistance of aluminum alloy surfaces, comprising the steps of:

[0021] (1) Soak the aluminum alloy specimen in acetone for 10 minutes, then wash it with deionized water, and dry it to constant weight;

[0022] (2) Use 800#, 1200# sandpaper to evenly polish the surface of the above-mentioned aluminum alloy specimen;

[0023] (3) Soak the polished aluminum alloy specimen in potassium hydroxide solution for 20 minutes, then take it out, wash it with clean water, and dry it to constant weight;

[0024] (4) Put the aluminum alloy specimen treated with the above potassium hydroxide solution into the coating solution, soak for 12s at 50°C, add 3.3% aminosiloxane by mass to the coating solution, and at 60°C, Stir for 30s, then add 0.8% triethanolamine to the coating solution, stir for 35s at 60°C, then add polyamine solution with 5% mass, stir for 30s at 65°C, keep warm for 10s, then take out The aluminum alloy specimens were dried in a ...

Embodiment 2

[0033] A method for improving the corrosion resistance of aluminum alloy surfaces, comprising the steps of:

[0034] (1) Soak the aluminum alloy specimen in acetone for 15 minutes, then wash it with deionized water, and dry it to constant weight;

[0035] (2) Use 800#, 1200# sandpaper to evenly polish the surface of the above-mentioned aluminum alloy specimen;

[0036] (3) Soak the polished aluminum alloy specimen in potassium hydroxide solution for 23 minutes, then take it out, wash it with clean water, and dry it to constant weight;

[0037] (4) Put the aluminum alloy specimen treated with the above potassium hydroxide solution into the coating solution, soak for 15s at 55°C, add 3.5% aminosiloxane by mass to the coating solution, and at 62°C, Stir for 32s, then add 0.8% triethanolamine to the coating solution, stir for 40s at 62°C, then add polyamine solution with 5% mass, stir for 32s at 68°C, keep warm for 14s, then take out The aluminum alloy specimens were dried in a ...

Embodiment 3

[0046] A method for improving the corrosion resistance of aluminum alloy surfaces, comprising the steps of:

[0047] (1) Soak the aluminum alloy specimen in acetone for 12 minutes, then wash it with deionized water, and dry it to constant weight;

[0048] (2) Use 800#, 1200# sandpaper to evenly polish the surface of the above-mentioned aluminum alloy specimen;

[0049](3) Soak the polished aluminum alloy specimen in potassium hydroxide solution for 21 minutes, then take it out, wash it with clean water, and dry it to constant weight;

[0050] (4) Put the aluminum alloy specimen treated with the above potassium hydroxide solution into the coating solution, soak for 13s at 52°C, add 3.4% aminosiloxane by mass to the coating solution, and at 61°C, Stir for 30-32s, then add 0.8% triethanolamine by mass to the coating solution, stir for 38s at 61°C, then add 5% polyamine solution by mass, stir for 31s at 66°C, keep warm for 12s, Then take out the aluminum alloy test piece, put it...

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Abstract

The invention discloses a method for improving the corrosion resistance of an aluminum alloy, and relates to the technical field of aluminum alloys. The method comprises the following steps that (1) an aluminum alloy test piece is soaked and washed with acetone, and then washed with deionized water and dried; (2) the surface of the aluminum alloy test piece is evenly polished; (3) the aluminum alloy test piece is soaked with a potassium hydroxide solution, then take out and washed with clean water, and finally dried; (4) the aluminum alloy test piece is placed into a film coating solution andsoaked for 12-15 seconds, amino siloxane is added into the film coating solution, the solution is stirred for 30-32 seconds, triethanolamine is added into the coat filming solution, the solution is stirred for 35-40 seconds, a polyamine solution is added, the solution is stirred for 30-32 seconds, heat preservation is conducted, the aluminum alloy test piece is taken out, dried, and naturally cooled to room temperature, and the aluminum alloy test piece is washed by adopting an ethyl alcohol solution, and dried. A layer of compact coating can be formed on the surface of the aluminum alloy testpiece which is treated by adopting the method, and can effectively achieve the protection effect on the aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a method for improving the corrosion resistance of the aluminum alloy surface. Background technique [0002] Because aluminum alloy has low density, high specific strength and specific stiffness, and good impact resistance, it is widely used in aviation and automobile industries. Under the general trend of automobile lightweight, the application of aluminum alloy in automobiles is becoming more and more extensive. Aluminum alloy has the characteristics of high strength, good processability, weldability, formability and corrosion resistance, and is often used as automobile inner lining board and other complex-shaped parts. Common commercial aluminum alloys are prone to corrosion damage in the form of pitting corrosion, crevice corrosion, exfoliation and stress corrosion during service. Aluminum alloys are usually subjected to different types of surface treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/56
CPCC23C22/56
Inventor 郭艳
Owner 山东弘通建材科技有限公司
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