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Corrosion of Q235 carbon steel influenced by the introduction of aerogenic and aerobic bacteria
Author(s) -
Tan Faqi,
Wu Jiajia,
Zhang Dun,
Li Ee,
Sun Yan,
Gao Jieyan
Publication year - 2018
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.201810086
Subject(s) - corrosion , carbon steel , biofilm , carbon fibers , oxygen , strain (injury) , bacteria , electrochemistry , chemistry , materials science , metallurgy , biology , composite material , organic chemistry , electrode , anatomy , composite number , genetics
Corrosion of carbon steel is investigated in the presence of Synechococcus sp. ( S . sp., an aerogenic strain) with or without the coexistence of Pseudoalteromonas sp. ( P . sp., an aerobic strain). Results of electrochemical and weight loss measurements suggest that the corrosion of carbon steel is continuous in S . sp. containing media while it is inhibited initially and accelerated finally in the coexistence of S . sp. and P . sp. This variation in corrosion rate is believed to be closely related to the difference in the growth and metabolism of two strains in different media. In media containing S . sp. alone, the slow reproduction of S . sp. leads to the relatively stable dissolved oxygen (DO) concentration and the continuous corrosion. In the case of S . sp. + P . sp., P . sp. consume DO and form protective biofilm at the initial stage, and then the death of P . sp. and the rapid reproduction of S . sp. cause the increase of DO concentration and the formation of porous corrosion products, leading to the change of corrosion rate.