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Surface treating method for magnesium alloy

A surface treatment, magnesium alloy technology, applied in chemical instruments and methods, cleaning methods and utensils, cleaning methods using liquids, etc., can solve the problems of difficult process control, easy falling of paint film, difficult operation, etc. The effect of outstanding ability, compact and meticulous film layer, and simple formula

Inactive Publication Date: 2008-02-27
MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The surface of magnesium alloy is very active and easily corroded and oxidized. If it is directly painted without chemical conversion coating, the paint film is easy to fall off, and the adhesion is not ideal, causing difficulties in application.
Conventional magnesium alloy chemical treatment method has complex process, difficult process control and difficult operation, and the passivation treatment often contains hexavalent chromium and hydrofluoric acid which are harmful to human body and environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First prepare the following chemical conversion solution according to the recipe:

[0027] Ammonium dihydrogen phosphate 20 g / L;

[0028] Potassium permanganate 30 g / L;

[0029] Sodium fluoride 1 g / L;

[0030] Sodium acetate 10 g / L;

[0031] Above-mentioned chemical transformation solution also can add following additive:

[0032] Sodium molybdate 3 g / L;

[0033] Sodium nitrate 5 g / L;

[0034] Sodium nitrite 1 g / L;

[0035] Adding any of the above additives to the above chemical conversion solution can make the oxidation-reduction reaction more sufficient and promote the formation of the chemical conversion film, and adjust the pH value of the above-mentioned solution to 5 with phosphoric acid, and then take AZ31 magnesium alloy samples in turn Go through the following steps:

[0036] a. Alkali washing, the AZ31 magnesium alloy sample is immersed in an alkaline solution for a period of time, so that the surface of the AZ31 magnesium alloy sample is degreased and ...

Embodiment 2

[0045] First prepare the following solution according to the recipe:

[0046] Ammonium dihydrogen phosphate 50 g / L;

[0047] Potassium permanganate 10 g / L;

[0048] Sodium fluoride 1 g / L;

[0049] Sodium acetate 10 g / l.

[0050] Above-mentioned chemical transformation solution also can add following additive:

[0051] Sodium molybdate 3 g / L;

[0052] Sodium nitrate 5 g / L;

[0053] Sodium nitrite 1 g / l.

[0054] Adding any of the above additives to the above chemical conversion solution can make the oxidation-reduction reaction more complete and promote the formation of the chemical conversion film, and adjust the pH value of the above-mentioned solution to 5 with phosphoric acid, and then take AZ31 magnesium alloy samples in turn Go through the following steps:

[0055] a. Alkali washing, the AZ31 magnesium alloy sample is immersed in an alkaline solution for a period of time, so that the surface of the AZ31 magnesium alloy sample is degreased and degreased;

[0056] b...

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PUM

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Abstract

The present invention provides a chemical conversion solution for treating magnesium alloy surface and its treatment method. Said solution uses water as solvent, every litre of said solution contains 10-50g of ammonium dihydrogen phosphate, 10-50g of potassium permanganate, 1g of sodium fluoride and 1-10g of sodium acetate. Said treatment method includes the following steps: caustic washing, ultrasonic water washing, acid cleaning, ultrasonic water washing, chemical film-forming treatment, ultrasonic water washing and drying.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to a magnesium alloy surface treatment method. Background technique [0002] Because magnesium alloy is lighter than engineering plastics, and as consumer electronics products gradually tend to be lighter and thinner, it has gradually become the main component of consumer electronics products such as notebook computers (information products that first use light metals), mobile phones, PDAs and projectors. At present, it has become a rising star of electronic information product materials. The scope of application of magnesium alloys is rapidly expanding, and the surface treatment of magnesium alloys is becoming more and more important. The surface treatment is mainly to improve the appearance of products and improve the performance of wear resistance and corrosion resistance. [0003] The surface of magnesium alloy is very active and easily corroded and oxidized. If it is directly pain...

Claims

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Application Information

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IPC IPC(8): C23C22/08C23G1/00B08B3/00
Inventor 陈龙
Owner MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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