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| Effect of SO2 on corrosion behavior of Cr-containing weathering steel in simulated marine atmosphere |
| FU Gui-qin，LI Dong-liang， ZHU Miao-yong |
| （School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China） |
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Abstract In order to study the effect of industrial air pollution on the corrosion behavior of Cr-containing weathering steel in marine atmosphere，the alternative wet/dry cyclic accelerated corrosion tests，using NaCl and NaHSO3 solutions as corrosive medium，and XRD，SEM were employed in tested steels with and without Cr which were vacuum induction melted and rolled，comparing the corrosion behavior in simulated marine atmosphere which contains and does not contain SO2. The results showed that the corrosion depth was decreased by the addition of Cr while was increased by the presence of SO2. The rust of two samples was both mainly composed of α-FeOOH，β-FeOOH，γ-FeOOH and Fe3O4. The transformation of Fe3O4 to α-FeOOH was promoted by the addition of Cr. The formation of β-FeOOH was hindered by SO2. Meanwhile，the transformation from γ-FeOOH and Fe3O4 to α-FeOOH in Cr-containing tested steel was promoted by the existence of SO2. Cr enriched in the inner rust layer which could help to increase the weather resistant performance. When there is no Cr in the steel sample，S and Cl enriched in the inner rust layer. However，0.43% Cr had shown the trend of cation selectivity since S enriched in the outer layer and Cl distributed evenly in both Cl? and Cl?＋SO2 containing environment.
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Received: 10 July 2018
Published: 24 December 2018
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2018, Vol. 53 
