PROPERTIES OF ELECTRODEPOSITED Ni-Mo COATINGS
Journal Title: Tribologia - Year 2011, Vol 235, Issue 1
Abstract
Mechanical and tribological properties of electrodeposited Ni-Mo coating were studied. Coatings of 30 μm thickness were deposited under different cathodic current densities 0.5–5 A/dm2 on steel disc substrates. Microhardness and Young’s modulus of electrodeposits were measured by Vickers instrumented microindentation method. Tested coatings have a hardness from 6.4 to 7.8 GPa and Young's modulus of 180–260 GPa. Coatings show significantly different characters of deformation from elastic-plastic to brittle fracture that were found from spherical indentation test results. Wear tests done on ball-on-disc tribometer indicate that coatings produced at a current density higher than 3 A/dm2 have a higher wear resistance of several times, which corresponds to the decrease of the coefficient of friction from 0.8 to 0.25. Large differences in hardness and wear resistance of Ni-Mo coatings were explained by significant differences in Mo content and the surface roughness of coatings obtained at different current densities. Microstructure and stresses of electrodeposits were performed using SEM and X-ray diffraction techniques. Properties of Ni-Mo coatings were compared with the hard chromium coating that is used in industry – WSK-PZL Rzeszów.<br/><br/>
Authors and Affiliations
Marcin Kot, Ewa Bełtowska-Lehman, Agnieszka Bigos, Paulina Indyka, Jerzy Morgiel, Sławomir Zimowski
Keywords
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