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Corrosion behavior of 2205 stainless steel in simulated flue gas condensate with different chloride concentrations in a waste incineration power plant
Author(s) -
Wang Xiaojie,
Ge Honghua,
Sheng Kun,
Xie Siyu,
Yao Jiahui,
Ge Fang,
Zhao Yuzeng
Publication year - 2020
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.201911389
Subject(s) - flue gas , corrosion , pitting corrosion , materials science , incineration , metallurgy , chloride , electrochemistry , chemistry , waste management , electrode , engineering , organic chemistry
The effect of Cl − on the initial corrosion behavior of 2205 duplex stainless steel (2205 DSS) in simulated flue gas condensate from a waste incineration power plant was investigated using Mott–Schottky plot, micro‐area electrochemical methods, and microscopic surface morphology observation. The results show that at 150°C, the carrier concentration of the 2205 DSS passive film was maintained at a small value and changed little when the Cl − concentration is less than 25 g/L, indicating that it has good pitting resistance. When the Cl − concentration reaches 30 g/L and above, the carrier concentration of the passive film increases remarkably, and pitting corrosion appears on the 2205 DSS surface. At 180°C, there is no obvious pitting on the surface when the Cl − concentration is not more than 15 g/L. When the Cl − concentration is 20 g/L or above, the carrier concentration of the passive film significantly increases, and pitting corrosion appears on the surface. When the Cl − concentration reaches 30 g/L, the carrier concentration of the passive film increases sharply. The passive film on a 2205 DSS surface is seriously damaged and accompanied by the occurrence of uniform corrosion.