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Chemical conversion treatment method of magnesium alloy surface

A technology of conversion treatment and surface chemistry, applied in the direction of metal material coating process, etc., can solve problems such as corrosion of magnesium alloy substrate, achieve the effect of reducing corrosion, improving chemical conversion treatment process of magnesium alloy, and improving quality

Inactive Publication Date: 2012-08-01
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the conversion film is formed on the surface of the magnesium alloy after chemical conversion treatment, the magnesium alloy substrate is also corroded to a certain extent, which is not allowed for some parts that require relatively high dimensional accuracy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The material processed in this embodiment is the shell of the magnesium alloy electric screwdriver head (hereinafter referred to as the shell).

[0012] Grind and load the shell of the electric screwdriver head;

[0013] Degreasing: Immerse the shell in a sodium hydroxide degreasing tank with a mass percentage of 6% and a temperature of 80°C, and use ultrasonic waves for 25 minutes to make the oil, alkaline solution and surface active substances undergo saponification and emulsification reactions and dissolve in the In water, in order to achieve the purpose of degreasing, it can be clearly seen that the surface of the shell becomes bright. After that, enter the first distilled water washing tank, apply ultrasonic waves at room temperature for 30 seconds, remove the alkaline solution and grease molecules remaining on the surface of the shell, take it out and dry it with hot air;

[0014] Pickling: Then immerse the casing in a pickling tank filled with 40g / L hydrofluoric...

Embodiment 2

[0020] The material processed in this embodiment is the shell of the magnesium alloy electric drill head (hereinafter referred to as the shell).

[0021] Grinding and loading the shell of the magnesium alloy electric drill head;

[0022] Degreasing: immerse the magnesium alloy in a sodium hydroxide degreasing tank with a mass percentage of 10% and a temperature of 90°C. After ultrasonication for 20 minutes, enter the first distilled water washing tank, and use ultrasonication for 50 seconds at room temperature. Take out and dry with hot air;

[0023] Pickling: Then immerse the magnesium alloy in a pickling tank filled with 60g / L hydrofluoric acid and 48g / L ethylene glycol, apply ultrasonic waves at room temperature for 2 minutes, and then enter the second distilled water washing tank after pickling. Use ultrasonic wave at room temperature for 50 seconds, take it out and dry it with hot air;

[0024] Alkali cleaning: immerse the magnesium alloy in an alkaline cleaning tank fi...

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Abstract

The invention discloses a chemical conversion treatment method of magnesium alloy surface, which comprises the procedures of: polishing of the magnesium alloy, loading, degreasing, acid cleaning, alkali cleaning, chemical film forming and sealing; the method is characterized in that: in the procedure of chemical film forming, waste magnesium alloy is added in the chemical film forming solution inadvance and soaked for 3 to 10 minutes, then taken out and put into a chemical film forming treatment trough which contains 10-30 ml / L of phosphoric acid, 30-60 g / L of barium hydroxide and 1-5 g / L ofsodium fluoride, has the temperature of 50 to 100 DEG C and the preadded magnesium alloy is soaked in a chemical film forming treatment trough, and ultrasonication is conducted for 10 to 30 minutes; and then the magnesium alloy is put into a fourth rinsing bowl for ultrasonic oscillation and cleaning, and then taken out and dried with hot air. The phosphating film of the invention is more flat, compact and even, and has remarkably reduced cracks and better corrosion resistance, and can effectively reduce the corrosion of the film forming solution to the magnesium alloy base; the method has strong technical universality, thus being capable of being applicable to any surface treatment technique; and the method has simple and convenient operation, and improves the chemical conversion treatment technique of magnesium alloy.

Description

technical field [0001] The invention relates to metal surface chemical treatment, in particular to an environment-friendly magnesium alloy surface conversion treatment method. Background technique [0002] Magnesium alloys are known as "green engineering materials in the 21st century" because of their low density, high specific strength, high specific stiffness, good thermal conductivity, and magnetic shielding properties. However, due to the extremely poor corrosion resistance of magnesium, the use of magnesium alloys is restricted. According to the film forming conditions, the surface treatment technology of magnesium alloy is mainly divided into two categories: chemical film forming and anodic oxidation film forming. It is considered that it has more industrial application prospects. However, the traditional chemical film formation technology for magnesium alloys is chromate treatment, because the treatment solution contains Cr 6+ Ions, which pollute the environment, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07C23C22/78
Inventor 杨湘杰金华兰
Owner NANCHANG UNIV