In oxidizing environments, electrocatalysis is highly effective in mitigating SCC, provided there is a stoichiometric excess of reductants over oxidants. This paper summarizes the mechanisms and criteria for effective SCC mitigation, with emphasis on the critical location for the catalyst in a crack and recent experimental support for these concepts. Optimization of electrocatalysis using an on-line process is described, and the experimental evidence for mitigation at = 0.1 ppb Pt is presented.