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Electroless nickel plating

May 21, 2019

What is Electroless Nickel Plating?

 Electroless nickel plating (EN) is a layer of nickel-phosphorus alloy on a metal or plastic substrate, and has a better ability of anti-wear, anti-friction and anti-corrosion compared with electroplated nickel. The phosphorus content ranging from 2% to 13% in EN can be categorized into below three types:  

 1.) Low phosphorus EN:  Widely applied for CNC parts which requires uniform thickness nickel plating both inside and  outside.  

 2.) Medium phosphorus EN:  Most seen in industrial, electronic applications or decorative purpose. The thicker electroless nickel plating is, the brighter the surface is, vise versa.  

 3.) High phosphorus EN:  Best corrosion resistance for CNC precision parts which requires ability of against highly corrosive acidic environments. Best surface finish with minimized porosity, nearly pit-free.  

 Below photo shows workpieces with electroless nickel plating(left) and electroplated nickel(right).