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Magnesium and magnesium alloy chemical oxidation process

A chemical oxidation, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of limited application fields, poor decoration, poor corrosion resistance, etc., and achieve strong operability, save procedures, and good corrosion resistance Effect

Inactive Publication Date: 2005-09-28
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium and magnesium alloys also have disadvantages such as poor heat resistance, poor corrosion resistance, poor wear resistance and poor decoration, which limit their application fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 100×100×5mm magnesium alloy castings for use.

[0020] 1. Dehydrogenation. Put the casting into a resistance furnace, control the temperature at 180°C, keep it warm for 2 hours, and carry out dehydrogenation treatment.

[0021] components

[0022] The above-mentioned components other than deionized water are dissolved in deionized water according to the formula ratio, and mixed to obtain an aqueous solution, which is put into a tank for use.

[0023] Soak the magnesium alloy casting to be treated in the above aqueous solution, keep the temperature of the solution at 58° C., and soak for 9 minutes.

[0024] 3. Wash with hot water. The above chemically degreased casting was immersed in hot water (deionized water) at 60° C. for 4 minutes.

[0025] 4. Wash in cold water. The castings washed with hot water were washed with flowing deionized water for 3 minutes at room temperature.

[0026] components

[0027] Dissolve the above-mentioned compone...

Embodiment 2

[0032] Take 100×100×5mm magnesium castings for use.

[0033] Steps 1-6 are the same as in Example 1.

[0034] components

[0035] The above-mentioned components other than deionized water are dissolved in deionized water according to the formula ratio, and mixed to obtain a chemical oxidation solution. The casting is immersed in the oxidation solution, the temperature is controlled at 90°C, and the chemical oxidation treatment is carried out for 30 minutes. Then, it was dried in the air for several seconds, and then washed with hot water (deionized water) at 60° C. for 3 minutes. During the oxidation process, sulfuric acid and ammonia water are used to adjust the pH value of the oxidation solution, and the pH value is controlled to be 5.5-4.7, and the color of the obtained film layer is brown.

Embodiment 3

[0037] Take 100×100×5mm magnesium castings for use.

[0038] Steps 1-6 are the same as in Example 1.

[0039] components

[0040] The above-mentioned components other than deionized water are dissolved in deionized water according to the formula ratio, and mixed to obtain a chemical oxidation solution. The casting is immersed in the oxidation solution, the temperature is controlled at 80°C, and the chemical oxidation treatment is carried out for 20 minutes. Then, it was dried in the air for several seconds, and then washed with hot water (deionized water) at 60° C. for 3 minutes. During the oxidation process, sulfuric acid and ammonia water are used to adjust the pH value of the oxidation solution, and the pH value is controlled to be 3.8-3.5, and the color of the obtained film layer is black.

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PUM

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Abstract

The chemical magnesium and magnesium alloy oxidizing process includes the technological steps of dehydrogenation, chemically deoiling, washing with hot water, washing with cold water, polishing, washing with cold water and chemical oxidization. The chemical oxidizing solution consists of methyl tetrahydroxyl phthalic anhydride, potassium sulfate or aluminum acetate, boric acid, potassium dichromate or sodium dichromate or sodium tripolyhosphate or sodium sulfite, ammonium molybdate or diammonium biphophate, ammonium nickel sulfate, deionized water and optional dithio dipropyl sulfonate in certain proportion. The present invention can obtain chemical oxide film with corrosion rate not more than 3.739 mm / a. In different chemical oxidizing conditions, oxide films of different colors may be prepared. The present invention may be applied in aeronautics, astronautics, electronics, communication, building, automobile and other industry.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for surface chemical oxidation of magnesium and magnesium alloys. Background technique [0002] Magnesium and magnesium alloys, as a lightweight engineering structural material, are being used more and more widely. Magnesium and magnesium alloys have the advantages of good shock absorption, low density, high specific strength and high specific stiffness, and are important aviation and aerospace structural materials. However, magnesium and magnesium alloys also have disadvantages such as poor heat resistance, poor corrosion resistance, poor wear resistance, and poor decoration, which limit their application fields. Chemical oxidation is an important method for surface treatment of magnesium and magnesium alloys to improve their properties. The following are several surface chemical oxidation methods of magnesium and magnesium alloys at home and abroad ba...

Claims

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Application Information

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IPC IPC(8): C23C22/05C23C22/06C23C22/07C23C22/26
Inventor 李德高刘正葛宜银林立
Owner SHENYANG POLYTECHNIC UNIV
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