Abstract
The present article explains the potential of controlling the ORP (oxidation reduction potential) in order to selectively leach the binder metal (commonly cobalt) from an hard metal substrate in a 2.0 mol/L HCl. Based on literature, corrosion investigations of cemented carbides reveal the chance of a parameter area, where just the cobalt is extracted without damaging the hard phase. Due to careful supervision of continuous H2O2 supply and by special sample preparation, empirical kinetic models explain the mechanism of the leaching reaction in dependence of oxidant feed. Thus, the chemical kinetic mechanism, diffusion control and passivation can be explained by evaluation of the leaching progress as well as the occurrence of species, which retard the reaction.
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