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Surface treatment method for improving corrosion stability of magnesium alloy

A surface treatment, magnesium alloy technology, applied in electrolytic coatings, electrophoretic plating, coatings, etc., can solve the problems of high toxicity of hexavalent chromium, high cost, technical limitations, etc., to achieve low cost, convenient application, process simple effect

Inactive Publication Date: 2006-02-22
重庆工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these two methods are easy to operate, low cost, and better treatment effect, but hexavalent chromium is highly toxic, it is a carcinogen, no matter at home or abroad, the chromate conversion method is gradually being restricted ;The surface of the micro-arc oxidation method is porous and must be sealed, and it is only used as the bottom layer, and the surface needs to be painted and baked.
Although the effect of other treatment methods is relatively good, but the cost is high or the technology has limitations, and there is a certain distance for industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Magnesium alloy workpiece:

[0029] The material is AZ31B magnesium alloy sheet provided by Steel Forge Company of the United States, a total of 7 pieces, and the sample size is 150mm×70mm×1mm. The main components of AZ31B magnesium alloy are shown in Table 3:

[0030] Element

Al

mn

Zn

Cu

Si

content

2.5～3.5

0.20～1.0

0.6～1.4

≤0.04

≤0.10

Element

Ni

Fe

other elements

total

Mg

content

≤0.005

≤0.005

≤0.30

margin

[0031] 2. Surface pretreatment of magnesium alloy workpieces:

[0032] Before plasma treatment, thoroughly clean the surface of the magnesium alloy workpiece to eliminate oil, oil film or other organic pollutants. The procedure is as follows:

[0033] Alkaline cleaning (name of solution, concentration) for 40 minutes, 64°C - rinse with deionized water - pickle (mixed solution of acetic acid...

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PUM

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Abstract

The invention provides a method of handling electron surface to increase its corrosion resistance, which is characterized in that electron surface is processed with catelectrode cataphoretic coating treatment or plasma surface treatment before cataphoretic coating treatment. In the invention, catelectrode cataphoretic coating treatment provides an antiabrasion layer for electron surface to increase its corrosion resistance, while plasma surface treatment before cataphoretic coating treatment can increase adhesive force of cataphoretic coating on surface. The invention has the advantages of simple process, convenient application, and low cost and notable effect.

Description

technical field [0001] The invention relates to anticorrosion treatment of magnesium alloys, in particular to a surface treatment method for improving the corrosion resistance of magnesium alloys. Background technique [0002] In recent years, magnesium alloys have been favored by many scientific researchers at home and abroad for their various excellent properties, and they are extremely widely used in industrial applications. However, the extremely poor corrosion resistance of magnesium alloys has become a major obstacle in practical applications, especially limiting its application in many industrial fields such as automobiles and aviation. [0003] At present, the improvement of the corrosion resistance of magnesium alloys by all scholars is nothing more than purification and surface treatment of the substrate. The existing magnesium alloy surface treatment technologies are mainly anodic oxidation, micro-arc oxidation, chemical plating, chemical conversion coating, phys...

Claims

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Application Information

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IPC IPC(8): C25D13/06C25D13/20
Inventor 张津孙智富
Owner 重庆工学院
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