The Effect of Cr and Si Additions on the High-Temperature Atmospheric Corrosion of Fe-Ni Alloys: A Transmission Mössbauer Spectroscopy Study
R. Idczaka, b, R. Koniecznya
aInstitute of Experimental Physics, University of Wrocław, pl. M. Borna 9, 50-204 Wrocław, Poland
bInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland
Received: January 30, 2018; in final form September 7, 2018
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The high-temperature atmospheric corrosion of Fe-Ni, Fe-Ni-Cr and Fe-Ni-Si alloys was studied using the 57Fe transmission Mössbauer spectroscopy. The transmission Mössbauer spectroscopy measurements were performed for samples after annealing process in vacuum as well as after the exposure to air at 870 K. The analysis of the obtained spectra gives an important information about changes of chemical composition and formation of iron oxides in studied samples during air exposure. The results reveal that the addition of a few atomic percent of Si has a significant effect on corrosion resistance of Fe-Ni alloys. In the case of Fe-Ni-Cr samples the effect is much less noticeable and the observed oxidation behaviour is quite similar to Fe-Ni and Fe-Cr alloys.

DOI:10.12693/APhysPolA.134.1137
topics: iron alloys, Mössbauer spectroscopy, high-temperature corrosion, atmospheric corrosion