Method for performing anticorrosive treatment on surface of magnesium alloy with recovered carbon dioxide

Abstract

The invention belongs to the technical field of magnesium alloy surface treatment, and particularly discloses a method for performing anticorrosive treatment on the surface of a magnesium alloy with recovered carbon dioxide. By taking recovered carbon dioxide as a raw material, the method is characterized by comprising the following steps: introducing carbon dioxide into water to prepare a carbonic acid water solution, soaking a magnesium alloy material in the obtained carbonic acid water solution, and ensuring that a basic aluminum magnesium carbonate film is generated on the surface of the magnesium alloy. According to the invention, the steps are simple, the raw material is accessible, the corrosion resistance of the magnesium alloy material can be effectively increased, and the recovered carbon dioxide is reasonably utilized, thus achieving the purpose of recycling carbon dioxide. Besides, the method disclosed by the invention decreases the carbon footprint of a magnesium alloy product and is suitable for wide popularization and application.

Description

(1) Technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a method for performing anti-corrosion treatment on the surface of magnesium alloy by recovering carbon dioxide. (2) Background technology [0002] Magnesium is abundant in nature, and the specific gravity of magnesium alloy is the lightest among practical structural alloys. In consideration of light weight, energy saving and exhaust pollution, magnesium alloy is a better choice. In addition, due to the recyclability of magnesium alloys, the environmental protection characteristics of magnesium alloys have become a great advantage in its development as the world's environmental protection recycling requirements. [0003] Due to the high activity of magnesium alloys, electrochemical corrosion is prone to occur, so magnesium alloy products must be treated with surface anti-corrosion treatment. Magnesium alloy surface treatment technolo...

AI Technical Summary

Problems solved by technology

However, because the waste liquid produced by chromate treatment has environmental problems, the hexavalent chromium contained in it will cause environmental pollution. Therefore, the European Community and the two advanced industrial countries of the United States and Japan have banned the use of chromate treatment.

However, at present, non-chromate (such as phosphate, manganate, vanadate, cobaltate, cerate and silicate) treatment methods are used, and its corrosion resistance and reliability are still difficult to compare with chromate. processing compared to

[0004] Although switching to non-chromate can avoid the restriction and prohibition of environmental regulations, there is still the problem of chemical waste treatment, which is not environmentally friendly in the long run

In addition, in the process of magnesium alloy recycling, the composition of these films will adversely affect the quality of recycled magnesium alloys, and waste liquid will be produced during the process of peeling the film, causing secondary pollution to the environment

In summary, there is no surface treatment technology for magnesium alloys that can take into account both good corrosion resistance and environmental protection.