Study on post‐treatments for electroless Ni–P coating

Abstract

In this paper, post‐treatments, including dehydrogenation process and passivation process for electroless Ni–P coating, are discussed. Porosity test and potentiodynamic polarisation curves were used to evaluate the porosity and corrosion resistance of electroless Ni–P coatings. The results indicated that the ideal dehydrogenation heat treatment temperature is 180–200°C. The passivation process can further increase the corrosion resistance of electroless Ni–P coating. Both dehydrogenation process and passivation process are essential to obtain compact, corrosion resistant electroless Ni–P coating.