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ABSTRACT
Cr 3 C 2 is added as a grain growth inhibitor to produce submicron cemented carbide. In a corrosive environment, the cobalt binder suffers from corrosion while tungsten carbide (WC) itself remains intact. In this study, cemented carbide specimens have been sintered to attain different magnetic saturation and grain growth inhibitor additions. Corrosion behavior of cemented carbides has been investigated by means of electrochemical measurements. A platinum plate and saturated calomel electrode were the counter and reference electrodes. Pseudopassive current density was altered by the grain growth inhibitor and magnetic saturation during sintering. The effects of microstructure and the presence of grain growth inhibitors on corrosion resistance of cemented carbide have been described. Higher amounts of tungsten and/or chromium dissolved in the binder improve corrosion resistance of a cemented carbide.
ACKNOWLEDGMENTS
The authors gratefully acknowledge Plansee Tizit GmbH for the preparation of cemented carbides and Austrian Exchange Service (ÖAD) for financial support of SS.