Journal
SURFACE & COATINGS TECHNOLOGY
Volume 244, Issue -, Pages 158-165Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.02.002
Keywords
Trivalent chromium coating; Chromium-phosphorus coating; Sodium hypophosphite; Corrosion resistance
Funding
- Iran National Science Foundation (INSF)
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Chromium coatings were electrodeposited from trivalent chromium sulfate based electrolyte, containing sodium hypophosphite as a complexing agent. The effects of this agent on morphology, composition, deposition rate, and corrosion behavior of coatings were investigated. Results indicated that, the addition of (0.0-0.75 M) sodium hypophosphite to the electrolyte: 1) resulted in co-deposition of chromium with (12.0-17.4 wt.%) phosphorus; 2) decreased the deposition rate from 17.0 mu m/h for Cr-C to 7.8 mu m/h for Cr-17.2 wt.% P coatings; 3) deteriorated the corrosion performance of the coatings due to an increase in micro-crack density and porosity. However, the addition of (0.45 M) sodium hypophosphite to the trivalent chromium chloride based electrolyte, decreased corrosion current density of electrodeposited coatings from 2.8 to 1.4 mu A/cm(2). (C) 2014 Elsevier B.V. All rights reserved.
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