@ARTICLE{Lee_Sungkyu_Corrosion_2020, author={Lee, Sungkyu and Kim, Min Jung and Choi, Nuri and Hwang, Sang Yeon and Chung, Seok-Woo and Lee, Seung-Jong and Yun, Yongseung}, volume={vol. 65}, number={No 2}, journal={Archives of Metallurgy and Materials}, pages={869-878}, howpublished={online}, year={2020}, publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences}, publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences}, abstract={A mechanistic exposure experiment was performed on the commercially available and welded Ni-Cr-Mo-Fe alloy samples used in the piping materials of the coal gasification pilot plant. Thermodynamic Ellingham-Pourbaix stability diagrams were constructed to provide insight into the mechanism of the observed corrosion behavior. The thermodynamic inference on the corrosion mechanism was supplemented with the morphological, compositional and microstructural analyses of the exposed samples using scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy analyses. X-ray diffraction result revealed stable corrosion products of NiO, MoNi4 and Cr4.6MoNi2.1 after accumulated total exposure duration of 139 h to the corrosive atmosphere. Scanning electron microscopy and energy-dispersive X-ray spectroscopy positively identified formation of rather continuous and adherent pre-oxidation corrosion products although extensively peeled-off oxides were finally observed as corrosion scales on the post-exposure alloy samples, which were attributed to the chlorination/oxidation into thin (spalled) oxides.}, type={Article}, title={Corrosion Behavior of Hastelloy® C-2000® Ni-Cr-Mo-Fe Alloys in the Entrained-Flow Coal Gasification Syngas Plants}, URL={http://journals.pan.pl/Content/116070/PDF/AMM-2020-2-47-Sungkyu%20Lee.pdf}, doi={10.24425/amm.2020.132833}, keywords={Mixed oxidant corrosion, Hastelloy® C-2000® Ni-Cr-Mo-Fe alloy, coal gasification, high temperature halogen corrosion, hydrated chlorides}, }