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Comparative tribological study of hard and crack-free electrodeposited chromium coatings

2003; Elsevier BV; Volume: 138; Issue: 1-3 Linguagem: Inglês

10.1016/s0924-0136(03)00075-x

1873-4774

M. Heydarzadeh Sohi, Abodlkarim Kashi, S.M.M. Hadavi,

Corrosion Behavior and Inhibition

In this study the tribological properties of single hard, single crack-free and duplex (i.e. a hard layer on top of a crack-free sub-layer) chromium coatings electrodeposited on a forged steel substrate have been investigated, using a reciprocating pin-on-plate wear testing machine. The results show that for a fixed thickness, the single hard chromium coating has the best wear resistance and the lowest coefficient of friction, while the single crack-free coating has the worst wear resistance and the highest coefficient of friction. The wear mechanism of the crack-free coating seems to be mainly adhesive, while the wear mechanism in the hard coating appears to be mainly abrasive. The wear in the duplex coating occurs by a combination of sub-layer deformation and crack formation in the surface region.