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Recent Patents on Materials Science

Editor-in-Chief

ISSN (Print): 1874-4648
ISSN (Online): 1874-4656

A Review of Recent Patents on Trivalent Chromium Plating

Author(s): Zhixiang Zeng, Aiming Liang and Junyan Zhang

Volume 2 , Issue 1 , 2009

Page: [50 - 57] Pages: 8

DOI: 10.2174/1874464810902010050

Price: $65

Abstract

Conventional Cr-matrix coatings electrodeposited from hexavalent Cr baths have been widely used for decoration and anti-wear. Electrodeposition of Cr from hexavalent Cr needs to be replaced by another material system due to the intense toxicity and carcinogenicity of hexavalent Cr. Trivalent Cr plating is considered to be a promising ‘environmental acceptable’ replacement technology for hexavalent Cr plating. This paper gives a review of patents and publications in the field of trivalent Cr plating. We primarily introduce the discharge mechanism of trivalent Cr, development of trivalent Cr electrolytes, anodic materials for the trivalent Cr plating, elimination of hexavalent Cr produced on the anode as a result of trivalent Cr oxidation and the electrodeposition of functional thick Cr coatings and black Cr coatings from trivalent Cr baths.

Keywords: Trivalent Cr plating, Anodic materials, Brightener, Ligand


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