Corrosion behavior of three iron-based model alloys in reducing atmospheres containing HCl and H2S at 600 °C |
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Authors: | T.J. Pan Y. Niu |
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Affiliation: | a State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui Road 62, 110016 Shenyang, China b DICheP, Universita di Genova, Fiera del Mare-Pad D, 16129 Genova, Italy |
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Abstract: | The corrosion of three Fe-xCr alloys (x = 8, 12, 18 wt.%) was examined at 600 °C in reducing atmospheres containing HCl and H2S with two different H2S contents and compared with the behavior of the same materials in H2S-free H2-CO2 and H2-HCl-CO2 mixtures producing similar oxygen and chlorine pressures. Exposure to the low-H2S gas mixture had only a reduced effect on the behavior of Fe-8Cr and Fe-18Cr, but increased significantly the corrosion rate of Fe-12Cr. Increasing the H2S level accelerated the corrosion of all the alloys, but particularly that of Fe-18Cr. In both cases only minor amounts of sulfur and chlorine were present close to the alloy/scale interface. An increase of the Cr content reduced the corrosion rate in both H2S gas mixtures, especially in the range 8-12 wt.% Cr, due to a larger volume fraction of Cr2O3 in the scale. The results have been discussed on the basis of the thermodynamic stability diagrams of the Fe-O-Cl-S and Cr-O-Cl-S systems. |
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Keywords: | A. Fe-Cr alloys C. Reducing atmosphere C. Oxidation C. HCl and H2S effects |
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