Abstract
The corrosion of Fe-Ni alloys containing up to 40 mass%Ni at 873-1073 K under mainly 104 Pa SO2 partial pressure was studied by thermogravimetry, X-ray diffraction, SEM, and EPMA. The effect of pre-oxidation on the corrosion of the alloys was also determined.The addition of Ni caused sigificant deterioration in the corrosion resistance of these alloys. The linear and parabolic rate constants obtained at given SO2 partial pressures increased with the nickel content.The decreased corrosion resistance was related to the formation of nickel sulfide and the increased transport of nickel ions through the scale.The pre-oxidation treatment for the alloys yielded a remarkable decrease in corrosion rates and sulfide content in the scales was low during the subsequent corrosion in SO2.
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