한국표면공학회지 (53권2호 72-79)
Study of High Temperature Corrosion Behavior of Fe-Cr Steel in Sewage Sludge-(SO2-O2-H2O-bal. CO2) mixed Gas Environment
하수슬러지-(SO2-O2-H2O-bal. CO2) 혼합 가스 분위기에서 Fe-Cr 강의 고온부식거동 연구
김민정;박주창;유인선;
Kim, Min Jung;Park, Joo Chang;Ryu, In Sun;
성균관대학교 신소재공학과;아주대학교 에너지시스템학과;한국폴리텍대학 신소재응용과;
School of Advanced Materials Science and Engineering, Sungkyunkwan University;Department of Energy Systems Research, Ajou University;3 Department of Advanced Material, Korea polytechnic;
Two Fe-Cr steels of T22 steel and STS430 steel were corroded at 650 and 750℃ for 100hr in sewage sludge-(0.3% SO2-6% O2-10% H2O-balance CO2) mixed gas environment. T22 steel corroded faster than STS430, indicating that the Cr content significantly influence the corrosion rates. T22 formed thick and non-protective Fe2O3 as the major oxide and Fe3O4 as the minor one. With an increase in corrosion temperature, their corrosion rates increased, being accompanied with formation of pores and cracks in the thickened oxide scales that were non-adherent. STS430 steel formed Fe2O3, Fe3O4 as the outer scale and (Fe, Cr)-O as the inner layer by which its corrosion rate is greatly reduced. Both the T22 and STS430 steel samples formed multi-layered scales by outward diffusion of Fe ions and inward diffusion of oxygen and sulfur ions at high-temperature more than 650℃.
Sewage Sludge;Corrosion;
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