Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 9    September 2013

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Corrosion behavior of thermal sprayed WC cermet coatings containing metallic binders in saline environment
Li-jun WANG1, Pei-xian QIU1, Yan LIU1, Wu-xi ZHOU2, Guo-qing GOU1, Hui CHEN1

1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Zigong Tungsten Carbide Co., Ltd. Zigong 643000, China

Abstract:A series of electrochemical and long-term corrosion tests were carried out in a neutral saline (5% NaCl) vapor of 35 °C on thermal sprayed WC cermet coatings containing different kinds of metallic binders in order to examine the effect of composition of binder materials on the corrosion behavior. The experimental results revealed that the overall corrosion resistance of WC-Co coating was inferior to that of WC-Co-Cr coating. For the coatings without Cr, WC-Co, general corrosion occurred in binder materials in addition to galvanic corrosion between WC particles and metallic binders in the neutral environment. By contrast, the formation of passive film in the form of surface oxide in the coatings containing Cr, WC-Co-Cr, suppressed the binder and metallic binders to be eroded. It is found that the chemical composition of metallic binder materials is one of the important factors influencing the corrosion resistance of HVOF sprayed WC cermet coatings in the neutral vapor.

 

Key words: WC-Co; WC-Co-Cr; corrosion protection; corrosion resistance; electrochemical characterization

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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