Hydraulic cylinder is an important actuator in hydraulic system, used to perform reciprocating motion, and is widely used in construction machinery. The precision piston rod of the hydraulic cylinder is an important part of the hydraulic cylinder. It is usually made of 35, 34 or seamless steel pipe to make a solid rod or a hollow rod.
In order to improve the wear resistance and anti-corrosion of the precision piston rod, the traditional process is to plate the surface with hard chrome and polish it, and the surface roughness Ra is 1.6~0.4. However, due to the serious pollution of chrome plating to people and the environment, and the uneven coating, high porosity, easy peeling, and high chrome plating cost, it cannot meet the needs of production, so it has been a long-term plan to replace chrome plating with a suitable and economical coating. Precision piston rod electroless plating is a process of metal deposition by using the redox chemical reaction in the solution. Usually, it refers to the reduction of metal ions in the solution to metal by a reducing agent without the action of an external current and deposited on the surface of the body to form a metal coating. The processing method, electroless Ni-P alloy amorphous coating, has excellent performance, can obviously improve hard plating, wear resistance and corrosion resistance, and can replace hard chromium plating.
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