Journal
SURFACE & COATINGS TECHNOLOGY
Volume 202, Issue 12, Pages 2725-2730Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2007.10.008
Keywords
composite plating; Al3+; tribological behaviors; trivalent chromium; Al2O3
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The amorphous chromium-alumina (a-Cr-Al2O3) composite coatings with thickness of 50 gm were electrodeposited from Cr(III) electrolytes containing Al2O3 particles and Al3+. The effects of Al3+ on the dispersibility and Zeta potential of Al2O3 particles in electrotyles were investigated. It was found that the Al3+ promotes the Al2O3 particles to uniformly disperse in the Cr coatings. Tribological behavior of a-Cr-Al2O3 composite coatings was studied as compared with amorphous chromium (a-Cr) coatings electrodeposited from single Cr(III) electrolytes. The results demonstrate that the introduction of Al2O3 particles significantly improves the tribological performance of a-Cr coatings. (C) 2007 Elsevier B.V. All rights reserved.
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