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Magnesium alloy chemical milling and processing technique

A chemical polishing and magnesium alloy technology, applied in the field of metal surface treatment technology, can solve the problems of large consumption of liquid medicine, difficult to control processing time, etc., and achieve the effect of good gloss, easy control and smooth surface

Inactive Publication Date: 2008-05-07
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

However, in the surface polishing process of magnesium alloys, most of them are treated with chromic anhydride, phenol, etc., and the processing time is difficult to control, and the consumption of chemical solution is also large. It is necessary to develop a stable magnesium alloy that does not use hexavalent chromium. Alloy Chemical Polishing Process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare a chemical polishing solution with the following components:

[0018] Nitric acid 60g / L;

[0019] Oxalic acid 30g / L;

[0020] Thiourea 5g / L.

[0021] Take an AZ31B magnesium alloy sample and carry out water washing, sandblasting, alkali cleaning, pickling, ultrasonic cleaning, and then immerse the sample in the above chemical polishing solution, and keep it stable at room temperature for 3 minutes. Take out the sample and wash it with water first and then dry it to obtain a polished product. The surface of the product obtained is smooth, with a bright effect and good gloss.

Embodiment 2

[0023] Prepare a chemical polishing solution with the following components:

[0024] Nitric acid 50g / L;

[0025] Oxalic acid 45g / L;

[0026] Thiourea 5g / L.

[0027] Take an AZ31B magnesium alloy sample and carry out water washing, sandblasting, alkali cleaning, pickling, ultrasonic cleaning, and then immerse the sample in the above chemical polishing solution, and keep it stable at room temperature for 5 minutes. Take out the sample and wash it with water first and then dry it to obtain a polished product. The surface of the product obtained is smooth, with a bright effect and good gloss.

Embodiment 3

[0029] Prepare a chemical polishing solution with the following components:

[0030] Nitric acid 70g / L;

[0031] Oxalic acid 30g / L;

[0032] Thiourea 10g / L.

[0033] Take an AZ31B magnesium alloy sample and carry out water washing, sandblasting, alkali cleaning, pickling, ultrasonic cleaning, and then immerse the sample in the above chemical polishing solution, and keep it stable at room temperature for 2 minutes. Take out the sample and wash it with water first and then dry it to obtain a polished product. The surface of the product obtained is smooth, with a bright effect and good gloss.

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PUM

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Abstract

The invention provides a chemical polishing treatment technology for magnesium alloy, which mainly comprises the following steps: a) pretreatment for surface cleaning of the magnesium alloy workpiece such as cleaning and degreasing, which can comprise the steps of mechanical treatment, alkali washing, acid pickling and cleaning; b) chemical polishing, that is, impregnation of the treated magnesium alloy workpiece into the chemical polishing solution; c) post treatment such as cleaning and drying of the workpiece after polishing; wherein, in step b, water is adopted as solvent of the chemical polishing solution which mainly comprises 40 to 100 g / L nitric acid, 0 to 50 g / L oxalic acid and 1 to 10 g / L thiourea. The invention has the advantages that the chemical polishing solution with simple components and convenient management and control is prepared from the mixture of a plurality of common acids and organics; the obtained chemical polishing surface has good glossiness and smooth surface; and the chemical polishing solution can be used in combination with other chemical treatment steps, and can also be used as the fine polishing solution in mirror finishing.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to a magnesium alloy surface treatment process. Background technique [0002] Magnesium alloy has the advantages of light weight, high specific strength, small elastic modulus, anti-electromagnetic interference, good shielding, strong shock absorption, good processing performance, and good thermal conductivity. It has been widely used in national defense, electronic appliances, etc. However, in the surface polishing process of magnesium alloys, most of them are treated with chromic anhydride, phenol, etc., and the processing time is difficult to control, and the consumption of liquid medicine is also large. It is necessary to develop a stable magnesium alloy that does not use hexavalent chromium. Alloy chemical polishing process. Contents of the invention [0003] In view of the above problems, the main purpose of the present invention is to provide a magnesium alloy chemical ...

Claims

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Application Information

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IPC IPC(8): C23F3/03
Inventor 陈龙
Owner MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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