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Elucidating the passivation kinetics and surface film chemistry of 254SMO stainless steel for chimney construction in simulated desulfurized flue gas condensates
Graphical abstract Display Omitted
Highlights The film electric field strength and donor density increase at high temperatures. Anodic potential rather than temperature increases the point defect diffusivity. A higher fraction of oxidized Cr and Fe(II) formed at high temperatures. Lower donor density but higher electric field strength within the anodic film. Higher Fe(II)/Fe(III) and Crox+hy/Feox+hy ratios in anodic film than at OCP.
Abstract Temperature-dependent passivation kinetics and surface film chemistry of 254SMO stainless steel in the simulated desulfurized flue gas condensates in thermal power plant chimney are investigated. Increasing temperature increases the electric field strength and multiplies the donor density, but exhibits little effect on point defect diffusivity within the passive film. The mixed CrIII-FeII/III-MoIV/VI oxide/hydroxide film with a higher amount of oxidized Cr and FeII compounds is formed at high temperatures. Anodic polarization generates a less oxidized film with higher FeII/FeIII and Crox + hy/Feox + hy ratios as compared to that formed at OCP when the film thickness is indistinguishable between the two film formation approaches. This steels provides an acceptable resistance to the attack of the flue gas in the chimney of thermal power plat.
Elucidating the passivation kinetics and surface film chemistry of 254SMO stainless steel for chimney construction in simulated desulfurized flue gas condensates
Graphical abstract Display Omitted
Highlights The film electric field strength and donor density increase at high temperatures. Anodic potential rather than temperature increases the point defect diffusivity. A higher fraction of oxidized Cr and Fe(II) formed at high temperatures. Lower donor density but higher electric field strength within the anodic film. Higher Fe(II)/Fe(III) and Crox+hy/Feox+hy ratios in anodic film than at OCP.
Abstract Temperature-dependent passivation kinetics and surface film chemistry of 254SMO stainless steel in the simulated desulfurized flue gas condensates in thermal power plant chimney are investigated. Increasing temperature increases the electric field strength and multiplies the donor density, but exhibits little effect on point defect diffusivity within the passive film. The mixed CrIII-FeII/III-MoIV/VI oxide/hydroxide film with a higher amount of oxidized Cr and FeII compounds is formed at high temperatures. Anodic polarization generates a less oxidized film with higher FeII/FeIII and Crox + hy/Feox + hy ratios as compared to that formed at OCP when the film thickness is indistinguishable between the two film formation approaches. This steels provides an acceptable resistance to the attack of the flue gas in the chimney of thermal power plat.
Elucidating the passivation kinetics and surface film chemistry of 254SMO stainless steel for chimney construction in simulated desulfurized flue gas condensates
Ge, Feng (author) / Wang, Liwei (author) / Dou, Yunpeng (author) / Wei, Junyang (author) / Cheng, Lianjun (author) / Wang, Xin (author) / Cui, Zhongyu (author)
2021-02-27
Article (Journal)
Electronic Resource
English
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