Electroless nickel plating is an auto-catalytic reaction used to deposit a coating of nickel on a substrate. Unlike electroplating, it is not necessary to pass an electric current through the solution to form a deposit. This plating technique is to prevent corrosion and wear. Electroless nickel techniques can also be used to manufacture composite coatings by suspending powder in the bath. Electroless nickel plating has several advantages versus electroplating.
Due to the high hardness of the coating, it can be used to salvage worn parts. Coatings of 25 to 100 micrometers can be applied and machined back to final dimensions. Its uniform deposition profile means it can be applied to complex components not readily suited to other hard-wearing coatings like hard chromium. CRC Surface Technologies offers mid (5 to 9%) and high (10 to 13%) phosphorus electroless nickel plating processes. Applicable specifications for electroless nickel are MIL-C-26074, MIL-F-14072 (M265), MIL-STD-171, ASTM B733, AMS 2404 and ASTM B656.