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Improvements in chrome plating of chrome-plated piston rods
Jul 28, 2018

In order to further improve the overall performance of the chrome-plated piston rod, it is necessary not only to strengthen the quality management level of machining, but also to improve the chrome plating process. For example, we can use a new composite chrome process, which is a double chrome plating of the piston rod. Usually, a low-hardness (about HV750) but plastic non-porous chrome is applied first to the base metal, about 0.02 to 0.03 mm thick.

 

A layer of hard chrome (greater than HV1050) is then applied over the chrome-plated piston rod substrate to a thickness of about 0.10 to 0.15 mm. The outer hard chrome, although still likely to have pores or microscopic cracks, cannot penetrate the underlying chrome and base metal and is hard and wear resistant. The hardness of the composite coating is smooth, and the crystallization is finer than the hard chrome layer plated by the conventional method, so that the piston rod can be both corrosion-resistant and wear-resistant.

 

The chrome-plated piston rod composite chrome plating specification requirements are as follows: first, when plating the underlying chromium, the temperature should be controlled between 65 and 70 ° C, the current density is 25-30 A/dm 2 ; when the outer layer is hard chrome, the temperature should be kept at The current density is 45-55 A/dm2 in the range of 50 to 55 °C. In addition, in order to ensure a uniform thickness of the coating, a contoured electrode should be used.http://www.xhychromerod.com/