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Hydraulic piston rod hard chrome plating process introduction
May 14, 2018

In order to further improve the performance of the hydraulic piston rod, it is necessary to further treat the surface of the piston rod. Generally, hard chrome plating is performed. The so-called hard chrome plating refers to coating the surface of the product substrate with a thick layer of chrome plating. Its thickness is generally 10-30μm or more. The properties of chromium are used to improve the hardness, wear resistance, temperature resistance and corrosion resistance of the hydraulic piston rod. .


So what kind of process features are there in this process? Under normal circumstances, for the treatment of hydraulic piston rods with hard chrome plating, the cathodic current efficiency is as high as 25% to 35%, and the deposition rate is high. At the same time, the hardness of the coating is high, approximately 900 to 1200 HV, and is uniformly dense. Mesh cracks, good wear resistance. At the same time, micro-cracks can be generated, and the number of micro-cracks can reach 800 to 2000 per cm. Concretely, adjustments can be made as needed to improve the corrosion resistance.


After this process, the performance of the hydraulic piston rod has been significantly improved, and it must be up to 500 hours in the salt spray resistance test. Shock absorber rods resistant to salt fog for more than 500 hours. Generally, during the chrome plating process, the plating liquid has good dispersion ability, uniform coating thickness, and is not prone to produce rough haze phenomenon, and the chromium layer is bright and smooth in appearance. In addition, the adhesion between the coating and the substrate is strong, and the pretreatment is similar to the conventional process, and the operation is easier than the conventional process.


The general process of hydraulic piston rod processing can be summarized as follows: first select the appropriate material, and then go through a cold forming a turning a continuous medium frequency induction quenching a pre-grinding a pre-precision grinding a cylindrical outer circle Superfinishing electroplating chromium-dehydrogenizing tempering superfinishing. In order to improve the relationship between piston rod surface quality and corrosion resistance, ultra-precision machining processes are added before chromium plating.


The electroplating process flow of the hydraulic piston rod is mainly: pre-plating inspection, mounting rack, chemical degreasing, electric dehydration, water washing, activated pickling, water washing, back engraving, chrome plating of the piston rod, recycling washing, washing, unloading . The last is to test the hydraulic piston rod product.http://www.xhychromerod.com/