How many ways can you protect the metal surface from corrosion?

1, anodic oxidation: mainly anodic oxidation of aluminum, and an alumina film is formed on the surface of aluminum and aluminum alloy by electrochemical principle. This oxide film has special characteristics such as protection, decoration, insulation and wear resistance.

2. Electrophoresis: used for stainless steel, aluminum alloy, etc. , which can make products appear in various colors, keep metallic luster, enhance surface performance and have good corrosion resistance.

3. Micro-arc oxidation: The process of applying high voltage in electrolyte solution (generally weak alkaline solution) to form ceramic surface film is the result of the synergistic effect of physical discharge and electrochemical oxidation.

4. Physical vapor deposition (PVD): It is a process in industrial manufacturing, which mainly uses physical processes to deposit thin films.

Extended data:

Causes of metal corrosion and rust;

1, metal rust is mainly caused by electrochemical corrosion and air oxidation. Pure metal or active metal is mainly due to the oxidation reaction between the metal surface and oxygen in the air, and metal oxide, namely rust, is generated on the metal surface.

2. If there are many impurities in the metal, these impurities will form chemical cells with the metal, and electrochemical corrosion will occur, thus oxidizing the metal into metal oxides and contacting with water and oxygen.

3. Raw materials have rusted and failed to be removed after processing; Contact with cutting fluid, lubricant and other process materials during processing; Improper neutralization and cleaning after pickling; Heat treatment, oxidative decarbonization or incomplete cleaning of residual salt; Hand sweat left by operators during inspection, handling and assembly; Improper stress or hydrogen annealing; It is not suitable for rust prevention between working procedure and storage.

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