ABSTRACT
Electroless nickel-phosphorous (NiP) was the first electroless deposited coating, in the moment of this plating technique discovery. Electroless nickel coatings have become very popular over the time due to their easy process and relatively cheaper and simple setup. Binary NiP coating is a dense alloy of nickel and phosphorus. Phosphorus is always present in the coatings when reduction is performed by hypophosphite. Electroless coatings formed from hypophosphite baths seemed to have excellent corrosion and abrasion resistance. The coatings can be further strengthened by a suitable heat treatment cycle to make the deposit hard and wear-resistant. Electroless NiP coatings are heavily dependent on the bath constituents. The plating speed and the properties of the deposit are affected significantly by the bath composition and phosphorous content.
