Fosfatbelegg

Fosfatbelegg, also known as phosphating or phosphate coating, is a surface treatment process used on metal components, primarily steel and aluminum. The primary purpose of phosphating is to enhance corrosion resistance and improve paint adhesion. It is achieved by immersing the metal part in a dilute solution of phosphoric acid and metal phosphates. During this process, a chemical reaction occurs, forming a thin, crystalline layer of insoluble metal phosphates on the surface of the metal. The most common types of phosphating are zinc phosphating, iron phosphating, and manganese phosphating, each offering slightly different properties. Zinc phosphating is widely used for its excellent corrosion resistance and paint adhesion, often serving as a pre-treatment before painting or powder coating. Iron phosphating is a simpler and faster process, typically used for light-duty corrosion protection or as a primer. Manganese phosphating is known for its superior lubricity and wear resistance, making it suitable for components subjected to friction, such as engine parts. The thickness and uniformity of the phosphate layer depend on factors like immersion time, temperature, and solution concentration. After the phosphating process, the parts are usually rinsed and often treated with a passivating agent to further enhance protection before drying. Fosfatbelegg is a cost-effective and versatile method for preparing metal surfaces for subsequent finishing operations or for providing a degree of in-process corrosion protection.