The surface of the treated steel parts has the following characteristics:
(1) It has good adhesion with the painted lacquer layer, and is 10 times higher than the corrosion resistance of the phosphating film after oiling, and the corrosion resistance of the direct lacquering of steel parts is increased by 12 times or more.
(2) The phosphating treatment process requires simple equipment and convenient operation, can be applied to production and realize automation, and has low cost and high production efficiency.
(3) It has many pores, is susceptible to water vapor erosion and absorbs dirt, and should be painted, oiled or sealed in time.
(4) Poor mechanical strength, brittleness, and poor deformability.
(5) Poor acid and alkali resistance, and the salt spray resistance after oiling is greatly improved.
(6) Suitable for handling small and medium-sized workpieces, which can be applied to the inner surfaces of pipes, cylinders and complex steel parts or other metals.

The phosphating film has excellent performance in various aspects and is widely used in various fields such as automobile manufacturing, shipbuilding, machinery manufacturing, chemical protection, household appliances, weapons, and aerospace and aviation industries. Most of them are used as protective layers for metals, and some are used for lubrication, friction reduction or insulation in electrical equipment in machining.
(1) Anti-corrosion engineering application. The joints of offshore or underground oil and natural gas transmission pipelines are generally stored before being assembled and connected, which are easily corroded and rusted, and even affect the size and precision of the assembly, resulting in failure to assemble. If the phosphating film is used for metal surface protection, the corrosion of the metal can be well avoided. Therefore, these connectors are phosphatized before entering the warehouse to ensure rust and corrosion resistance for a relatively long period of time.
The appearance of the phosphating film largely replaces the rust-preventing grease, and the surface of the phosphating steel piece can play a certain protective role even if it is not coated with anti-rust oil, anti-rust grease or anti-rust wax. Phosphating film layers which satisfy this requirement are generally prepared by zinc or manganese phosphating.
(2) For painting the bottom layer. The steel workpiece is first phosphatized before coating to form a layer of phosphate film on the surface of the workpiece, which can improve the corrosion resistance of the surface after coating, and improve the decorative performance of the surface, while enhancing the coated organic film layer. The bonding force with the metal surface.
The phosphatized metal surface can be sprayed with solvent-based coatings or powder coatings or electrophoretic coatings. Brush paint. Phosphating films which satisfy this requirement are generally prepared by zinc or zinc-calcium phosphating. Such a phosphating film has a film weight of 0.2 to 1.0 g/m 2 (for a large-deformed steel piece paint bottom layer), 1 to 5 g/m 2 (for a general steel piece paint bottom layer), 5 to 10 g/m 2 (for In the absence of deformation of the steel bottom layer).
(3) Reduce friction. The phosphating film has good wear resistance and can reduce the friction during the processing or parts work. The phosphating film which satisfies the requirements for use is a manganese-based phosphating film, and a zinc-based film may also be used.
(4) For electrical insulation. Since the phosphate film is formed by crystal deposition of phosphate on the surface of the metal workpiece, it has high electrical insulation properties and can be used for electrical insulation treatment of silicon steel sheets in motors and transformers. Phosphating films that meet this demand are mainly prepared by zinc phosphating.

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