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　　The products of alloy steel shot manufacturers add chromium oxide layer to protect the metal below, greatly improving the corrosion resistance. The oxide layer and the air form spontaneously, forming a passive layer which is more corrosion-resistant. If the surface of the steel is damaged, the first ferroalloy is released without oxide skin, and then the material becomes more vulnerable, but the oxide layer spontaneously re establishes contact with the air again.

　　Chromium, carbon, nickel, molybdenum, titanium and other materials are added to the alloy steel shot. Alloy steel shot is an alloy. This special alloy has better corrosion resistance, wear resistance and heat resistance. It is very popular. The standard surface treatment thickness of the surface is limited to 6mm. If the quality is more important than the appearance, it is an ideal choice. The post-treatment of alloy steel shot produces a visually uniform appearance. The quality is very high. Corrosion is caused by external pollution. The material is finished It's not damaged, but the steel particles outside stick to it and start to rust.

　　Local corrosion is more dangerous than general corrosion. Once corrosion occurs, it will spread rapidly. Due to the combination of different materials such as aluminum and alloy steel shot, pit corrosion or pitting corrosion, damage and pollution will lead to failure of passivation layer, which cannot be repaired.

　　Corrosion occurs in cracks and is required during design and welding. In the case of high risk, intergranular corrosion and heating conditions lead to the chromium content locally less than 10.5%, which is the lowest level required for the formation of passivation layer. There is no strong passivation layer and the corrosion resistance is insufficient. Stress corrosion materials are corroded, which is not true corrosion. As long as the appropriate material quality is selected, it is the result of external pollution, and thorough cleaning is OK.

　　The alloy steel shot needs maintenance. Sometimes the particles containing iron will rust. The alloy steel shot itself may not start to rust. There is only one remedial measure, that is pickling. If the wrong material is selected, there will be problems. However, in some edge cases, pickling once is enough to passivate the material below and form a self repairing layer.