Discussing methods for improving metal corrosion resistance through protective coatings

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A protective layer is applied to the metal surface to isolate the metal product from the surrounding corrosive agents, thereby preventing corrosion. For example: (1) Coating the surface of steel parts with machine oil, vaseline, paint, or covering them with corrosion-resistant non-metallic materials such as enamel or plastic. (2) Using methods such as electroplating, hot-dip plating, or spray plating, a layer of metal that is resistant to corrosion, such as zinc, tin, chromium, nickel, etc., is applied to the surface of steel. These metals often form a dense oxide film due to oxidation, which prevents substances such as water and air from corroding the steel. (3) Use chemical methods to form a fine and stable oxide film on the surface of steel. Such as the formation of a fine black film of iron tetraoxide on the surface of steel components like machine parts and firearms.