EFFECT OF ELECTROPLATING PARAMETERS on INTERNAL STRESS in Ni-MoS_2 COMPOSITE PLATING

摘要

The effects of basic electroplating parameters and particle addition on the internal stress of Ni and M-MoS_2 composite coatings have been determined using a statistical experimental design. The incorporation of M0S2 particles decreases the internal stress. Presence of these particles could even change the nature of the stress from tensile to compressive. Both temperature and current density have no significant effects on the internal stress. Whereas low pH and high coating thickness lead to a decrease in the value of internal stress. The effects of surfactants, sodiumlignosulfonate and Depramin C on the internal stress were insignificant. More homogeneous distribution of particles was obtained when sodiumlignosulfonate was added to Watts bath.