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Effect of Pretreatment on Nickel-Boron Coatings Deposited on 8620H Alloy Steel Adhesion and Corrosion Resistance

Author(s): Holge Siger

The 8620H steel substrates were electrodeposited with Ni-B coatings after various pretreatments, including no pretreatment, after sandblasting with glass sand, and after sandblasting with emery powders. 8620H alloy steel is a Ni-Cr-Mo alloy steel with a high wear resistance that is achieved using a surface carburizing hardening process. High tensile strength and high percent elongation are among the mechanical features of 8620H alloy steel. As a result, 8620H steel is appropriate for engineering parts such as gears, bearings, power screws, automobile parts, and so on. Because of its good corrosion resistance, high hardness, and high wear resistance, Ni-B coatings have been developed as a protective layer on metal substrates. Electro-less plating and electroplating are the two most used procedures for preparing Ni-B coatings. Boron is obtained from Di Methyl Amine Borane (DMAB) or Tri Methyl Amine Borane (TMAB) in the plating solution for NiB coatings applied by electroless plating or electroplating.
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