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Vol.52, No.11, 837 ~ 856, 2014
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| Title |
| Review Paper : Development of Sulfuric and Hydrochloric Acid Dew-Point Corrosion-Resistant Steels: 1，Effect of Alloying Elements on the Corrosion Resistance of Low-Alloy Steels |
| 박선아 Sun Ah Park , 김정구 Jung Gu Kim , 이병호 Byoung Ho Lee , 윤정봉 Jung Bong Yoon |
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| Abstract |
| Carbon steels requires the corrosion resistance against sulfuric and hydrochloric acid dew-point corrosion at the low temperature section of FGD systems. The design of the corrosion-resistant steels was focused on a small number of conventional alloying elements such as Cu, Sb, W, Mo, Cr, Mn, Nb, Al, Co, P. The corrosion rate decreased in the following order: P > Blank > Cr, Co, Al, Nb, Mn, W, Mo ≫ Cu. The Cu-containing steel presents the lowest corrosion rates due to the accumulated Cu compound, Cu and Cu oxides, on the surface. The corrosion rate decreased in the following order: Cu-Cr, Cu-Mo > Cu > Cu-W > Cu-Sb. W, Mo and Cr is not effective with Cu content. Addition of Sb not only created a protective Sb oxides film on the steel surface, but also accelerated the reaction of copper deposition through the adsorbed complex salt, Cu-Sb species. (Received July 3, 2014) |
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| Key Words |
| alloys, rolling, corrosion, scanning electron microscopy，SEM, acid dew-point corrosion |
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