Canadian Finishing & Coatings Manufacturing - May/June '24 - 25

PLATING AND ANODIZING: ELECTROLESS NICKEL
Reduced Ion:
A New Approach to Electroless Nickel
BY AMBROSE SCHAFFER
A
fter being accidentally discovered by Brenner and
Riddell in the 1940s, electroless or autocatalytic
nickel has become one of the most important
commercial coating technologies used today.
This plating process is unique, as it does not require the use
of external electrical current to deposit the metal from the
solution. Instead, deposits are formed through a chemical
reduction-oxidation (or redox) process using specialised
reducing agents under specific conditions to transfer electrons
between the reacting species. This reaction produces a coating
which contains additional element(s) that are deposited into
the coating to produce an alloy. Depending on the type and
concentration of the alloying species, the coating will exhibit
varying properties that differ fundamentally from pure nickel
deposits. The most widely utilised type of electroless nickel
is electroless nickel-phosphorus (ENP), which is produced
using a phosphorus-containing reducing agent, namely
sodium hypophosphite. Generally, ENP coatings deliver
superior corrosion resistance, improved wear resistance,
and higher hardness compared to other plated coatings, along
with exceptional deposit uniformity. Since ENP is a chemical
process, all surfaces in contact with the plating solution are
coated uniformly. This makes ENP particularly valuable on
substrates that have highly complex geometries.
May/June 2024
25
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Canadian Finishing & Coatings Manufacturing - May/June '24

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