fosfaatointikylpy

Fosfaatointikylpy, also known as phosphating or phosphate coating, is a surface treatment process used on metal parts, primarily steel, aluminum, and zinc. The primary purpose of phosphating is to improve corrosion resistance and enhance the adhesion of subsequent coatings such as paint, powder coating, or lubricants.

The process involves immersing the metal part in a solution containing phosphoric acid and metal phosphates, typically zinc, iron, or manganese. This causes a chemical reaction on the metal surface, forming a thin, crystalline phosphate layer. The specific type of phosphate used dictates the properties of the coating. Zinc phosphate coatings are common for corrosion protection and paint adhesion, while manganese phosphate coatings are often used for wear resistance and lubrication. Iron phosphate coatings are generally applied for light corrosion resistance and as a base for paint.

The phosphating process typically involves several stages, including cleaning and rinsing the metal to remove any oils or contaminants, followed by the phosphating dip itself. After the phosphating bath, the parts are rinsed again and often treated with a passivation or sealing solution to further enhance performance. The resulting phosphate layer is porous, which helps to anchor subsequent organic coatings, improving their overall durability and preventing delamination. This makes phosphating a crucial step in many manufacturing processes where metal parts require protection and a good surface finish.