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Views: 2 Author: Site Editor Publish Time: 2023-02-06 Origin: Site
This article follows the following article to continue to discuss how to reduce the corrosiveness of the surface of magnesium alloy.
Phosphorus is a process of reaction of metal and dilute phosphate or acid phosphate solution to form a phosphate protective film. It is one of the ways to replace the treatment of poisonous chromate. On the surface of the metal, it generates a layer of non -metal, non -conductive, porous phosphate thin film through a chemical reaction. In addition, the phosphorurative film can also transform the metal surface from an excellent conductor to a adverse conductor, which inhibits the formation of micro -batteries on the metal surface, effectively hinders the corrosion of the coating, and can double the corrosion resistance and water resistance of the coating. Sexual, so the phosphorum film is recognized as a good coating base.
Through the study of the chemical transformation processing process of magnesium alloy phosphate-hyperangolate, it is found that the pH value is 4, K2HPO4 content of 150g/L, and kmno4. Essence Phosphate treatment is generally used as the bottom layer of painting treatment. In the system composed of manganese salt and phosphate, a chemical conversion film was obtained on the AZ91D magnesium alloy.
Typical phosphate treatment process: skipping and acidification oxidation → pickling (70 ~ 80 ° ℃, 10min) → phosphorification treatment → pure water washing → dry aging.
Organic protection coating is usually used as the last protective measures with other anti -corrosion methods, which are widely used. The key to this technology is to improve the adhesion of the coating and enhance the corrosion resistance of the coating. The nature of the underlying surface roughness and the nature of the coating material determines adhesion and corrosion resistance. The protection of organic coatings is to act as a blocking layer between the metal body and the environmental medium, which hinders water, ions, 02, and charge to the body, preventing the formation of corrosive circuits. Organic coating protection technology has the advantages of variety and color, wide adaptability, low cost, and simple process.
