After pickling passivation, the surface of seamless steel pipe becomes uniform silvery white, which greatly improves the corrosion resistance of stainless steel. Phosphating is the process of immersing seamless steel pipe into phosphating liquid (some acid phosphate main solution), in the surface deposition to form a layer of crystalline phosphate conversion film insoluble in water, phosphating is a chemical and electrochemical reaction to form phosphate chemical transformation film process, the formation of phosphate conversion film called phosphating film,
Thus to a certain extent to prevent metal corrosion, used to paint the bottom before painting, improve the adhesion and anti-corrosion ability of the film layer, in the metal cold processing process to play anti-friction lubrication use. "Phosphating saponification" refers to a process of re-saponification after phosphating. It is generally used in drawing or stretching machine processing processes. After phosphating film is generally 8-12 microns, and then into the saponification solution, and then pull or stretch. The purpose of saponification is to further increase lubrication performance.
Pickling, phosphating, saponification seamless steel pipe Operating Procedures brief process: pickling-high pressure flushing-phosphating-high-pressure water flushing-saponification-drying-transfer stacking.