The effect of residual stress on the electrochemical corrosion behavior of Fe-based amorphous coatings in chloride-containing solutions

The electrochemical corrosion and passive behavior of activated combustion high-velocity air fuel FeCrMoMnWBCSi amorphous metallic coatings (AMCs) under different geometries that produced a variable tensile residual stresses were investigated in chloride-containing solutions by using electrochemical measurements and X-ray photoelectron spectroscopy. The tensile residual stresses of AMCs were determined by the mechanical method of sharp indentation testing. A systematic detrimental effect of tensile residual stress on passive current density and localized corrosion was found. The detrimental effect of residual stress was aggravated at higher temperatures and acidity. The implication of high donor density on the passive film stability, derived from Mott-Schottky analysis, is also discussed. (C) 2016 Elsevier B.V. All rights reserved.