Abstract
The friction and wear behavior of chromium coatings produced by different process conditions have been investigated under dry sliding conditions. Crack-free deposits give markedly higher friction coefficients and wear rates than heat treated conventional coatings with the same hardness. The high friction coefficient of crack-free chromium is mainly due to the large plastic strains generated in its surface layers during sliding. The chromium coating showed pronounced increases in hardness at low loads which is attributed to enhanced strain hardening in the very small stressed volumes. The conventional and heat treated coatings are strengthened by the same microstructural mechanisms and conform to the Archard wear equation. The crack-free deposits possess distinctly different crystallographic and metallurgical structures and do not obey the same Archard relationship.
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