The mechanical surface is inevitable and surrounding media exposure (such as air , moisture, water vapor, corrosive gases and liquids, etc.), so that the metal surface will rust, corrosion and damage after certain time. Especially the high-temperature workshop like metallurgical plants and chemical plants, is even more serious corrosion and wear.

The lubrication grease or oil on metal with no corrosion, but they can used be to isolate from humid air moisture and harmful media. The metal surface needed to coat with preservative and anti-corrosion additives of oil or grease to prevent corrosion and erosion.