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The essentials of iron and steel room temperature phosphating knowledge
Phosphating the steel surface can prevent corrosion, and the film formed by the surface phosphating can increase the adhesion of the anticorrosive paint-primer.
The mechanical properties and magnetic properties of steel remain basically unchanged after phosphating treatment. In the cold extrusion process, under certain temperature conditions, the phosphating film and the lubricant (soap or emulsifier) u200bu200bchemically react, and part of the fatty acid soap reacts with the zinc phosphate Zn3 (Po4) 2 in the phosphating film to generate lubricity. Very strong fatty acid zinc Zn (RCOO) 2, thereby enhancing the lubricating effect. Phosphating film has no adhesion to molten metal and can be used to prevent parts from adhering to molten metal with low melting point. It can be used for local nitriding parts to prevent tin staining. It can also be used to avoid bonding between die-casting parts and molds, reduce friction, avoid or reduce surface strains or cracks, thereby extending the service life of the mold. The phosphating film layer also has high electrical insulation properties and can be used as an electrical insulation layer for silicon steel sheets.
The application scope of room temperature phosphating technology is as follows:
1. The room temperature phosphating technology can be widely used on the inner surface of pipes, gas cylinders and steel parts with complex shapes, as well as the protective film on the surface of parts that are difficult to obtain a protective layer by electrochemical methods. Such as used in the automotive industry, gears, radiators, brake pads, joints, pipe cavity parts, screws, nuts, etc. Petrochemical industry, pipelines, various valves, pump casings, shaft sleeves, blades, etc.
2, hardware, mold, machinery manufacturing industry, various molds, hardware decoration parts, washing machine shells, plates, measuring tools, electric fan blades, bicycle parts, sewing machine parts, etc.
3. Weapon industry, bearings, guns, pumps on ships, metal parts on ships, etc.
4, Aerospace industry, bearing journals, pistons, landing gear parts, seat frames, pillars, etc.
5. In the coating industry, increase the binding force of organic coatings.