Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (52권5호 251-257)

Study of High Temperature Corrosion of Fe-Cr-W Steel in Coal-Biomass Co-firing Power Plant Environment

석탄-바이오매스 혼소발전 분위기에서 Fe-Cr-W 강의 고온부식 연구

김민정;샤오샤오;이동복;
Kim, Min Jung;Xiao, Xiao;Lee, Dong Bok;

성균관대학교 신소재공학과;
School of Advanced Materials Science and Engineering, Sungkyunkwan University;

DOI : 10.5695/JKISE.2019.52.5.251

Abstract

Fe-9Cr-2W steels were corroded at $600-800^{circ}C$ for up to 100 hr in ($Na_2SO_4-K_2SO_4-Fe_2O_3$)-($CO_2-0.3%SO_2-6%O_2$) mixed gas. The poor condition samples formed thick oxide scales that consisted primarily of $Fe_2O_3$ as the major oxide and $Fe_3O_4$, FeO as the minor one through preferential oxidation of Fe. Fe-9Cr-2W steels corroded fast, forming thick and non-protective scale. The scale divided into the outer and inner layer, which consisted of the outer Fe-O layer and the inner (Fe,Cr)-O layer containing some (Fe,Cr)-S.

Keywords

High Temperature corrosion;$CO_2$;$SO_2$;Oxidation;Sulfidation;