Manganese phosphating is applied when wear resistance and anti-galling properties are required. Manganese phosphate also possesses the ability to retain oil, which further improves anti-friction properties and imparts corrosion resistance to the coated parts.Magnesium phosphating typically have black color with a slight brown tint, intensity of which depends on the content of manganese oxide in the coating. Manganese phosphate is applied by immersion method. The substrate surface should be acid activated prior to coating. The coating weight is typically in the range 500-4000 mg/ft2 (5-40 g/m2). Because of their good anti-friction properties and corrosion resistance iron phosphate coatings are widely used for combustion engine parts (camshafts, piston rings, cylinder liners, gear parts), weapon mechanisms and other parts working with friction. Oil treatment is commonly employed as post treatment.