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Electroless Nickel Plating

Electroless Nickel Plating

Electroless nickel (EN) plating is a chemical reduction process which depends upon the catalytic reduction process of nickel ions in an aqueous solution (containing a chemical reducing agent) and the subsequent deposition of nickel metal without the use of electrical energy. Due to its exceptional corrosion resistance and high hardness, the process finds wide application on items such as valves, pump parts etc., to enhance the life of components exposed to severe conditions of service ,particularly in the oil field and marine sector. With correct pretreatment sequence and accurate process control , good adhesion and excellent service performance can be obtained from EN deposited on a multitude of metallic and non-metallic substra6tes.

The advantages of EN plating are:

  • Uniformity of the deposits, even on complex shapes.
  • Deposits are often less porous and thus provide better barrier corrosion protection to steel substrates, much superior to that of electroplated nickel and hard chrome
  • Deposits have inherent lubricity and non-galling characteristics, unlike electrolytic nickel.
  • Deposits have good wetability for oils
  • In general low phosphorus are considered solderable. Mid and high phosphorus EN’s are far worse for solderability
  • Deposit hardness can be increased by post-bake processing

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