Abstract
Corrosion behavior of 300M in neutral corrosion environments containing NaCl simulated by total immersion (TI), salt spraying (SS) and periodic immersion (PI), was investigated by surface analysis techniques, corrosion weight-loss method, and electrochemical measurements. In total immersion environment, rust on the steel consisted of a porous outer rust layer with main constituent of γ-FeOOH, and an inner rust layer of dense Fe3O4 film with network broad cracks. In salt spraying environment, outer rust with main composition of γ-FeOOH/α-FeOOH/Fe3O4 was compact, and inner rust showed dense Fe3O4 film. Rust formed by periodic immersion exhibited a compact outer rust layer with constituent of α-FeOOH/γ-FeOOH/Fe3O4 and an inner rust layer with composition of α-FeOOH/α-Fe2O3; inner rust showed a ultra-dense film adherent to the steel. The corrosion rate showed a rule of v ss(salt spraying)>v ti(total immersion)>>v pi(periodic immersion) in 0–240 h, and v ss≈v ti»v pi in 240–720 h. The rust formed by periodic immersion was dense and compact, with stable electrochemical properties, and had excellent protection on the steel. Humidity and oxygen concentration in all the environments played major roles in rust formation.
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Funded by the National Natural Science Foundation of China(No.51171011)
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Guo, Q., Liu, J., Yu, M. et al. Corrosion behavior of ultra-high strength steel 300M in different simulated marine environments. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 372–378 (2016). https://doi.org/10.1007/s11595-016-1378-8
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DOI: https://doi.org/10.1007/s11595-016-1378-8