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Chemical oxidation liquid for magnesium alloy

A chemical oxidation and magnesium alloy technology, applied in the field of chemical oxidation solution, can solve the problems of high content of hexavalent chromium ions, poor corrosion resistance of oxide film, low production efficiency, etc., to reduce environmental pollution and production costs, strong adhesion, The effect of short passivation time

Active Publication Date: 2015-05-13
SHANXI UNIV OF CHINESE MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a magnesium alloy chemical oxidation solution to solve the problems of high hexavalent chromium ion content, high operating temperature, long oxidation time, low production efficiency and corrosion resistance of the oxide film in the existing chemical oxidation solution. poor problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 3.5g of potassium dichromate, 0.95g of potassium aluminum sulfate, 0.12g of ammonium fluoride, and 0.6g of acetic acid into 100g of water, stir and dissolve evenly to obtain solution A. Take 0.6g of citric acid, 0.12g of boric acid, and 0.12g of mixed rare earths and add them into 100g of water, stir and dissolve to obtain solution B evenly. Mix solution A and solution B, add water to 1kg, stir and mix evenly to obtain a chemical oxidation solution.

[0015] Keep the pH value of the chemical oxidation solution at 2.0 and the temperature at 45°C, immerse the degreased and pickled magnesium alloy test piece in the chemical oxidation solution for passivation for 180s, take it out for washing, and dry at 60°C to obtain iridescent Passivation film layer sample 1. Keeping other process conditions unchanged, the passivation time was shortened to 150s, and a similar iridescent oxide film sample 2 was obtained. The above two samples were subjected to a neutral salt spray t...

Embodiment 2

[0017] Add 5 g of potassium dichromate, 1.3 g of potassium aluminum sulfate, 0.18 g of ammonium fluoride, and 0.85 g of acetic acid into 100 g of water, stir and dissolve evenly to obtain solution A. Take 0.9g of citric acid, 0.18g of boric acid, and 0.18g of mixed rare earths and add them into 100g of water, stir and dissolve to obtain solution B evenly. Mix solution A and solution B, add water to 1kg, stir and mix evenly to obtain a chemical oxidation solution.

[0018] Keep the pH value of the chemical oxidation solution at 2.0 and the temperature at 45°C, immerse the degreased and pickled magnesium alloy test piece in the chemical oxidation solution for passivation for 180s, take it out for washing, and dry at 60°C to obtain iridescent Passivation film layer sample 3. Keeping other process conditions unchanged, the passivation time was shortened to 150s, and a similar iridescent oxide film sample 4 was obtained. The above two samples were subjected to neutral salt spray ...

Embodiment 3

[0020] Add 6.5g of potassium dichromate, 1.65g of potassium aluminum sulfate, 0.24g of ammonium fluoride, and 1g of acetic acid into 100g of water, stir and dissolve evenly to obtain solution A. Take 1.2g of citric acid, 0.24g of boric acid, and 0.24g of mixed rare earths and add them into 100g of water, stir and dissolve to obtain solution B evenly. Mix solution A and solution B, add water to 1kg, stir and mix evenly to obtain a chemical oxidation solution.

[0021] Keep the pH value of the chemical oxidation solution at 2.3 and the temperature at 45°C, immerse the degreased and pickled magnesium alloy test piece in the chemical oxidation solution for passivation for 180s, take it out and wash it, and dry it at 60°C to obtain iridescent Passivation film layer sample 5. Keeping other process conditions unchanged, the passivation time was shortened to 150s, and a similar iridescent oxide film sample 6 was obtained. The above two samples were subjected to neutral salt spray te...

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Abstract

The invention discloses a chemical oxidation liquid for magnesium alloy. In parts by weight, each 100 parts of the chemical oxidation liquid contains 0.012-0.039 part of mixed rare earth, 0.349-0.98 part of potassium dichromate, 0.012-0.039 part of ammonium fluoride, 0.058-0.196 part of citric acid, 0.012-0.039 part of boric acid, 0.093-0.235 part of aluminium potassium sulfate, 0.058-0.157 part of acetic acid and the balance of water, and the pH value is 2.0-2.5. A magnesium alloy test sample passivated by the chemical oxidation liquid can bear a neutral salt spray test for more than 48 hours, has good corrosion resistance, and has good coating adhesion; the chemical oxidation liquid is low in chromate concentration, short in passivating time and high in film forming speed, can be widely applied to surface treatment of a magnesium alloy profile, a magnesium alloy cast and other products.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and relates to a chemical oxidation solution for oxidizing the surface of magnesium alloy. Background technique [0002] Magnesium alloy is the third largest metal engineering material after steel and aluminum alloy. It is known as "green engineering material in the 21st century". Due to its high specific strength, good impact resistance, good vibration absorption and heat transfer performance, it can be processed It is welded and dimensionally stable, and has the characteristics of electromagnetic shielding and recycling. It can meet the requirements of lightweight and environmental protection for aerospace, automotive and electronic products, and has become one of the fastest growing materials in European and American countries. However, due to the high chemical activity of magnesium, its natural oxide film is not protective, especially in humid air, sulfur-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37
Inventor 刘晓芳高志强
Owner SHANXI UNIV OF CHINESE MEDICINE
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