What Is Phosphating In Powder Coating?
Phosphating is a chemical process for treating the surface of the steel, where barely soluble metal-phosphate layers are formed on the base material. It is mostly used as a pretreatment method in conjunction with another method of corrosion protection and can be applied to both ferrous and nonferrous materials such as aluminum, stainless steel, copper, brass, zinc, nickel and titanium.
The process involves immersing a component in an acidic bath solution which converts it into iron phosphate, creating porous layers that are absorbent and suitable for subsequent powder coating without further treatment.
Iron phosphate provides increased adhesion and resistance against oxidation, making it ideal for use before applying powder coat paint. Additionally, controlling the phosphating process is essential to achieving consistent coatings which ultimately result in a stable powder coating process