Hard chrome plating, Chrome composite coating

Hard chrome plating
The basic coating for piston rods is the hard chrome plating, wich is carried out by electroplating in single or multiple layers. Piston rods in length of up to 20 meters and diameters up to 1,500 mm are hard chrome plated in deep chrome bathes. For application in more aggressive enviroments we can also supply the piston rods in stainless steel quality with chrome layer. Also electroplated nickel base layer with chrome plating is possible.

Technical facts

  • Electro plated piston rod coating
  • Layer thickness of 20 μm up to 100 μm
  • Dual layer chrome plating possible
  • Hardness of the chrome plating from 800 HV to 950 HV
  • Surface finish up to Ra 0,15 μm


  • Standard corrosion protection and functional layer

Fields of application

  • Hydraulic cylinders in general Machine Tools, Mobile cranes, Construction machinery, Printing industry etc.

Chrome composite coating
To improve the corrosion protection properties it is possible to combine the hard chrome layer with a second layer underneath the chrome. In this case a separation of the functions of the layers is made, the hard chrome layer functions as a wear and tear protection, the base layer functions as a corrosion barrier. Usually the base layer is made of a galvanized Nickel. Over and above we can offer to combine the hard chrome layer with a thermic sprayed NiCr base layer or with a P.T.A. welded base layer.

HUNGER Hydraulik Solutions – Successfull Operating Worldwide