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| Accelerated Degradation of Three Iron-based Alloys Induced by the Presence of HCl and H2S in Reducing Atmospheres at 700oC |
| pan taijun |
| 中国科学院金属研究所 |
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Cite this article:
pan taijun. Accelerated Degradation of Three Iron-based Alloys Induced by the Presence of HCl and H2S in Reducing Atmospheres at 700oC. Acta Metall Sin, 2007, 43(12): 1261-1267 .
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Abstract The corrosion behavior of three Fe-Cr alloys has been examined at 700oC in reducing atmospheres containing constant HCl and two different levels of H2S. Except for Fe-18Cr in the low-H2S gas mixture, in all cases the scales consisted of an outermost porous layer of iron oxides overlaying an inner layer of a mixture of the Fe and Cr oxides and the Fe-Cr spinel plus a zone of internal attack rich in oxygen with little sulfur. An increase of the H2S level in gas mixtures produced an accelerated corrosion for all Fe-Cr alloys, particular for Fe-18Cr. An increase of the Cr content induced the decrease of the corrosion rate in two gas mixtures. The accelerated corrosion induced by sulfur and chlorine is mainly due to the formation of sulfides and chlorides in the scales. The equilibrium partial pressures of chlorine, oxygen and sulfur of the mixed gases were calculated to estimate the possible reactions between the alloy components with the multi-reactant atmosphere and to interpret their corrosion behaviors.
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Received: 20 March 2007
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