天津大学学报（英文版）
天津大學學報（英文版）
천진대학학보（영문판）
TRANSACTIONS OF TIANJIN UNIVERSITY
2015年
3期
234-243
,共10页
夏大海%Luo Jingli
夏大海%Luo Jingli
하대해%Luo Jingli
Alloy 800%thiosulfate%passive film%localized corrosion
Passivity degradation of Alloy 800 in simulated crevice chemistries was systematically investigated using cyclic polarization curve, electrochemical impedance spectroscopy(EIS), Mott-Schottky analysis, Auger electron spectroscopy(AES)and atomic absorption spectrometry(AAS). Cyclic polarization showed that the pitting potential in a thiosulfate solution was much lower than in either a chloride solution or a sulfate-chloride solution. Mott-Schottky results revealed that passive films showed n-type semiconductivity, and the presence of thiosulfate in chloride solution led to an increased donor density in the passive film. EIS spectra indicated that thiosulfate enhanced the film dissolu-tion rate in chloride solutions. Moreover, thiosulfate enhanced the pitting propagation rate in chloride solution by sta-bilizing the metastable pits and forming sulfide within the pits.
