Characterization of as-deposited and annealed Cr-C alloy coatings produced from a trivalent chromium bath

被引：69
作者：
Ghaziof, S. [1 ]
Golozar, M. A. [1 ]
Raeissi, K. [1 ]
机构：
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 496卷 / 1-2期
关键词：
Cr-C alloy; Coating; Amorphous; Nanocrystalline; Annealing; Corrosion resistance; ELECTROCHEMICAL-BEHAVIOR; MECHANICAL-PROPERTIES; FORMIC-ACID; ELECTRODEPOSITION; LAYER;
D O I：
10.1016/j.jallcom.2010.02.101
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Amorphous Cr-C alloy coatings were electrodeposited from a trivalent chromium bath containing formic acid. The effects of plating parameters such as pH and current density on composition, structure, morphology and corrosion behaviour of as-deposited coatings were investigated. Results showed that the suitable current density for Cr-C alloy electrodeposition is increased as the pH is decreased. Furthermore, by decreasing the pH, higher amount of carbon was introduced into the coatings. The Cr-C alloy coatings deposited at lower pH showed higher passive current density on Tafel plot. By annealing the amorphous Cr-C alloy coatings at 300 degrees C. a nanocrystalline structure having higher hardness was obtained. However, the corrosion resistance was seen to be impaired. Annealing at 600 degrees C led to the precipitation of Cr23C6 which resulted in a higher hardness. The formation of Cr23C6 enhanced the corrosion resistance of coatings due to an increase in corrosion potential. However, formation of micro-cells between the Cr23C6 precipitates and bulk chromium prevented the passive film formation. (C) 2010 Elsevier B.V. All rights reserved.
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页码：164 / 168
页数：5
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