Metal Finishing – Plating & Coating
Electroless Nickel Plating
Autocatalytic process; uniform coating thickness even on internal surfaces and complex geometries. For parts requiring high hardness and corrosion resistance.
Process
A nickel-phosphorus alloy forms on the metal surface through an autocatalytic reaction. The coating deposits uniformly; post-plating heat treatment increases wear resistance and improves adhesion.
What it provides
- Adds surface hardness
- Weldable even at low coating thickness
- Oxidation resistance against organic and inorganic chemicals
Frequently asked questions
Which specifications cover electroless nickel?
It is applied to MIL-C-26074, AMS-2404 and ASTM-B733. The phosphorus content (low, mid, high) is chosen for the target: high phosphorus for corrosion resistance, low phosphorus for hardness.
Can hardness be raised by heat treatment?
Yes. Ageing at around 400 °C raises hardness from about 500 HV to over 900 HV; on steel it is planned together with hydrogen embrittlement relief.
Have a drawing for this process?
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