Phosphating is a chemical surface conversion process that enhances paint adhesion on metal surfaces and provides protection against corrosion. It is widely used especially in the automotive, white goods, and metal furniture sectors.
Types of Phosphating
Zinc phosphating is the most commonly used method and shows superior performance in under-paint corrosion protection. Manganese phosphating, on the other hand, is preferred for mechanical parts due to its lubricating property.
Critical Process Parameters
The success of the phosphating bath largely depends on the correct management of free acid, total acid, and acceleration point values. Regular bath analysis and control are the key to obtaining a homogeneous and high-quality phosphate layer.