Abstract
The corrosion behaviour of Fe-25Cr-20Ni, 310SS, Ni-25Cr, and Ni-25Cr-2Mn-1Si (all in wt%) with and without NaCl-KCl deposits in Ar-60%CO2-20%H2O gas at 650 °C was investigated. Without salt deposits, both Fe-25Cr-20Ni and Ni-25Cr formed thick internal oxidation zones (IOZs) and external oxide scales. The addition of Si+Mn significantly improved the corrosion resistance in this case. The presence of NaCl-KCl deposits accelerated the corrosion, forming porous external oxide scales and IOZs, with no protective effect provided by Si+Mn alloying. The effect of chlorides was discussed in terms of oxide volatilization and the accelerated reaction of chlorine with oxides in the IOZs.
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