Abstract
The anodic behavior of WC‐6% Co alloy in nitrogen saturated phosphoric acid solution was studied by means of potentiostatic dissolution, polarization curves, and micrographic studies. At anodic potentials between open circuit and −100 mV (vs. SCE) the binder phase alloy (Co‐W) dissolves actively to yield dissolved Co and W while the WC phase remains unattacked. At approximately −0.1V the WC‐Co alloy passivates resulting in an 80% decrease in current. Further anodic polarization causes the current to increase as active dissolution of the WC phase comes into play. Application of these results to Co/WC separation in alloy scrap recycling is discussed.
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