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Atmospheric corrosion of carbon steels in tropical and subtropical climates in Southern China
Author(s) -
Huang Juncong,
Meng Xiaobo,
Huang Yinhui,
Jiang Wubin,
Chen Ri,
Zheng Zhijun,
Gao Yan
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.201911487
Subject(s) - subtropics , corrosion , environmental science , relative humidity , chloride , carbon fibers , atmospheric sciences , environmental chemistry , metallurgy , materials science , chemistry , meteorology , geography , ecology , geology , composite number , composite material , biology
Q235 and Q345 carbon steels were exposed for up to 24 months at three test sites of tropical and subtropical climate. The atmospheric corrosion kinetics of Q235 and Q345 was studied by weight‐loss measurement. The results show that the ranking of the atmospheric corrosivity from weak to strong of the three test sites is Xishuangbanna, Guangzhou, and Wanning. The kinetics of the atmospheric corrosion process presents two stages with an accelerated second stage in marine environments of high chloride ion content and high relative humidity, whereas no second stage appears in the kinetics curves in rural and industrial urban environments. The corrosion acceleration stage in the marine environment of the Wanning site is attributed mainly to the high chloride ion concentration and loose rust layer structure.