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The present study aims to investigate the electrochemical corrosion behavior of high temperature vacuum brazed WC-Co-NiP coatings deposited onto 16MnCr5 (1.7131) case hardening steel in 3.5% NaCl (pH 7) electrolyte solutions. Corrosion resistance is appraised using the potentiodynamic polarization method at room temperature in a three-electrode cell configuration. The coating characteristics like morphology, microstructure and chemical composition before and after the corrosion tests have been analyzed by means of scanning electron microscopy (SEM) combined with energy-dispersive X-ray (EDX) spectroscopy. This coating technology makes possible the deposition of high quality hardfacings, with minimal influence on the metallic substrate. The electrochemical measurements resulted in a lower corrosion current density, correlated with a significant improvement in the corrosion behavior of the WC-Co-NiP coated samples, compared to the uncoated ones.
Pascal et al. (Fri,) studied this question.