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Effect of inorganic anions on the corrosion behavior of UNS S32750 duplex stainless steel in chloride solution
Author(s) -
Jin S.,
Liu C.M.,
Lin X.,
Li M.J.,
Cao H.B.,
Wang H.Z.
Publication year - 2015
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201408185
Subject(s) - chloride , dielectric spectroscopy , materials science , pitting corrosion , corrosion , electrochemistry , sulfate , scanning electron microscope , polarization (electrochemistry) , metallurgy , bicarbonate , inorganic chemistry , nuclear chemistry , chemistry , composite material , electrode , organic chemistry
The present study explored the electrochemical behavior of UNS S32750, a super duplex stainless steel which was not commonly researched in previous studies. The effect of bicarbonate (H C O 3 − ) and sulfate (S O 4 2 −) on the electrochemical behavior of UNS S32750 duplex stainless steel in the chloride (Cl − ) solution was investigated using potentiodynamic polarization, scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), and Mott‐Schottky analysis. The electrochemistry behavior shows that with the addition ofH C O 3 −andS O 4 2 −, pitting potential increased and passive current density decreased, indicating that bicarbonate or sulfate can reduce sensitivity to pitting corrosion of UNS S32750 duplex stainless steel in Cl − solution, and film resistance ( R 1 ) and lower charge transfer resistances ( R 2 ) increased, and the carriers density ( N A and N D ) values are about 10 20 cm 3 , and the carriers density decreases. The results may provide theoretical guidance for material‐choosing in the wastewater treatment industries containing high chloride concentration such as non‐ferrous metallurgical wastewater.