AbstractAlloys of WC–Co (6-30 wt-%Co) and WC–Ni (6-15 wt-%Ni) were implanted with chromium, molybdenum, and titanium ions at fluences from 1×1021to 4×1021ions m-2. Their corrosion resistance was evaluated before and after implantation using accelerated electrochemical techniques in a 0.005M H2S04and a 0.001M NaCl + 0.05M Na2S04solution. In general, ion implantation tended to decrease the corrosion rate and improve the pitting resistance. The most promising results were obtained with molybdenum implantation, which increased the passive range and substantially raised the pitting potential.