Global Shield piston rod coating is said to offer many performance benefits over conventional electrolytic hard chrome plating.Global Shield with its single-layer, fully-dense, submicron structure has greater interfacial adhesion and higher impact resistance than electrolytic hard chrome (EHC). It exhibited almost no micro-cracking, chipping, or spalling and no delamination when compared to EHC plating using the Rockwell C-scale indentation test protocol. It has a minimum hardness of HRC 54, low friction, and high ductility and toughness.
The coating can be applied during original cylinder manufacture or during after-market cylinder maintenance. Coatings can be finished to a wide range of thicknesses, which is useful for resurfacing of damaged rods. The coating can also be stripped with no need for grinding, which facilitates removal and coating during remanufacture.
It can be applied to rod diameters from ½ to 15 in. OD (12 to 380 mm) and lengths to 13 ft. (3.9 6m). The standard thickness is 0.001 in. (25 μm), but it can be applied up to 0.020 in. (500 μm) thick for greater corrosion resistance.
The Global Shield coating is said to maintain a low-carbon footprint—it doesn’t use any hazardous chromium and only nominally uses other hazardous materials. It also requires less energy to produce than other corrosion-resistant coatings. Furthermore, it has 90% plating efficiency versus the 20% of EHC plating.
For more information on the Global Shield coating, call Parker’s Mobile Cylinder Div. at (800) 848-5575 or visit www.parker.com/mcd.
