Electroless Nickel Plating - Micro Crystalline to Amorphous Hard Nickel Phosphorus Coating
Electroless Nickel plating (EN), also known as autocatalytic nickel, is a micro crystalline to amorphous, hardenable nickel-phosphorous alloy coating. It offers a good barrier coating corrosion resistance. Electroless nickel is generally applied to a thickness range of 25 to 150 microns (0.0001” to 0.0015”) typically does not require further surface finishing, machining or grinding after plating.
The autocatalytic reaction between nickel and reducing agent in the plating bath deposits nickel onto metal substrates without the use of anodes and electrical current, hence the name “electroless”. Since no high or low current densities exist, a very uniform thickness of deposits over irregular shapes can be achieved.
Phosphorous content in the coating can range from 5% to 12%. U.S. Chrome offers “Mid-Phos” (5% to 8%P) and “High-Phos” (10% to 12%) electroless nickel plating services.
Electroless nickel can be heat treated at relatively low temperatures (400° to 450°C) to achieve higher hardness (up to 1000 HVN); however, corrosion resistance is reduced.
For many applications electroless nickel plating is applied as a barrier coating under Hard Chromium to provide the ultimate in corrosion and wear resistance.
Features & Benefits
Medical device plated with a duplex
Electroless Nickel Plating Properties
Typical Applications for Electroless Nickel Plating
Plastic & glass molds, bearings, gears, medical parts, oil & gas, and aircraft components.
MIL-C-26047, ASTM B733, AMS 2404