Premium
Auswirkungen von Chloridionen auf die elektrochemische Reaktion von rostfreien 316 Stählen in Mischungen aus geschmolzenen Nitratsalzen
Author(s) -
Zhu M.,
Zeng S.,
Sharif A.,
Cao B.,
Zhang H.,
Wang M.
Publication year - 2020
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201900016
Subject(s) - corrosion , dielectric spectroscopy , chloride , ternary operation , electrochemistry , materials science , molten salt , scanning electron microscope , decomposition , inorganic chemistry , metallurgy , chemistry , nuclear chemistry , composite material , electrode , organic chemistry , computer science , programming language
Effects of chloride ion on decomposition of ternary nitrate and corrosion behaviors of 316 stainless steel (316 SS) were studied by electrochemical corrosion tests in molten salt. Chemical composition and morphology of the corrosion products were analyzed using x‐ray diffraction and scanning electron microscopy equipped with energy disperse spectroscopy. Composition analysis for molten salt combined with morphology analyses of corrosion layer showed that presence of chlorine ions slowed down decomposition of ternary nitrate and increased corrosion rate of stainless steel markedly. The polarization curve obtained indicated that the corrosion current density increased from 3.02 mA ⋅ cm −2 to 8.76 mA ⋅ cm −2 with the addition of 10 % NaCl. Electrochemical impedance spectroscopy indicated a decrease in charge‐transfer resistance of the double layer between 316 SS and ternary Nitrate containing 10 % NaCl, resulting in a decreased corrosion resistance of 316 SS.