Abstract: Fe-20%Ni-25%Cr alloys were aluminized through the pack-cementation technique by immersing them in the pack that consisted of the source metal, an activator, an inert filler. After aluminized Fe-20%Ni-25%Cr alloys were corroded at 800 oC for 10-100 hr in (0.9448 atm N2 + 0.031 atm H2O + 0.0242 atm H2S)-mixed gas condition. Pack-cementation is a good surface treatment technique for development of corrosion resistance coating to be utilized at high temperature corrosive condition. The corroded test coupons were characterized by a scanning electron microscope (SEM), Energy Dispersive X-Ray Spectrometer (EDS), an electron probe micro-analyzer (EPMA), an X-ray diffractometer (XRD) with Cu-Kα radiation. The aim of this study is to study the microstructural transformation of the pack-cementation aluminized coating before and after corrosion. Pack-cementation aluminized in the formation of Fe3Al intermetallic compound layer on the matrix. The Fe3Al intermetallics have reasonable corrosion and oxidation-resistance, because of the aluminized coating corroded mainly to α-Al2O3 through the selective oxidation of Al in the outer Fe3Al coating.

Key words: Sulfidation, aluminizing, pack-cementation, corrosion.

Cite: Min Jung Kim, Dong Bok Lee, "Corrosion Protection on High-Temperature Sulfidation of Fe-Base Alloys," International Journal of Materials Science and Engineering, Vol. 8, No. 3, pp. 93-98, September 2020. doi: 10.17706/ijmse.2020.8.3.81-86.


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