Tribological Behavior of Electrodeposited Ni-Fe Multilayer Coating

In the present study, the sliding wear behavior of pulse-electrodeposited multilayer Ni-Fe coatings as a function of pulse parameters including frequency and duty cycle has been studied using pin-on-disc tests against an Al2O3 counterbody. Sliding wear was investigated with respect to the coefficient of friction (COF), worn surfaces, wear rate, and wear debris. The results of COF with sliding distance revealed a two-region state. At the start of the test the COF was higher, which was due to high stress at the contact region and the occurrence of delamination wear. Then the COF was collapsed as a result of pin penetration and decreased stress at the contact region. The intensity of delamination is decreased at the later stage. The wear resistance of multilayer coatings is increased with increasing frequency and decreasing duty cycles as a consequence of grain refinement and hardness enhancement.