The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the 'law of matching affinities' concept

摘要

The comparative breakdown of passivity of tin by fluorides and chlorides highlight the significant slower kinetics of attack by the kosmotrope fluoride when compared to the chaotrope chloride at pH 5.7 and 10. The origin of this difference is ascribed to the predominant halide-dependent mechanism of attack, pitting with chlorides and film thinning with fluorides, which is conditioned according to the anion-specific hydration properties. (C) 2015 Elsevier Ltd. All rights reserved.