Study on post-treatments for electroless Ni-P coating

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 degrees 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.