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HWAHAK KONGHAK,
Vol.41, No.2, 243-248, 2003
Vol.41, No.2, 243-248, 2003
철계와 니켈계 합금강의 고온 황화 부식반응 특성
High Temperature Sulphidation Behavior of Fe-based and Ni-based Alloys
철계, 니켈계 내식 합금강과 H2S 가스와의 황화부식 반응 특성을 기-고 화학반응 속도론적으로 살펴보았다. 사용 합금강은 SUS 310, SUS 316, Inconel 600과 Hastelloy X이다. 전기로 내에 설치된 지름 50 mm의 석영 튜브반응기에서 부식실험이 행하여졌다. 400 ℃에서 700 ℃까지의 등온 조건에서 실험이 이루어졌고, 분위기 가스의 영향을 보기 위하여 H2S 가스를 함유한 N2(dry), N2(wet), CO2(dry), CO2(wet) 가스 분위기에서 실험하였다. 부식 생성물을 파악하기 위하여 X-ray 회절기와 주사전자현미경 분석을 하였다. 1.7% H2S, 600 ℃ 이하 온도 조건에서는 니켈계 내식강 중 Hastelloy X와 철계 내식강 중 SUS 310 등 고크롬 합금강이 높은 내식성을 나타내었다. 황화반응 활성화에너지는 68-157 kJ/mol의 값을 가졌다. 0.3-4.99% H2S농도 범위에서 H2S농도 변화에 따라서 SUS 316의 경우 6-314 mg/dm(2)ㆍday, Hastelloy X의 경우 5-336 mg/dm(2)ㆍday로 부식속도는 크게 증가되었다. H2S가스 농도에 대한 황화반응차수는 1.48-1.91로 나타났다. 부식 표면에는 황화니켈, 황화철피막이 형성되었다.
The sulphidation reactions of Fe-based alloys and Ni-based alloys have been analyzed in the point of the gas-solid reaction kinetics. The alloy specimens were SUS 310, SUS 316, Inconel 600, and Hastelloy X. All the specimens were tested cyclically every 8hr during 48hr in the isothermal temperature from 400 ℃ to 700 ℃ with various gases conditions: H2S in N2(dry), N2(wet), CO2(dry), and CO2(wet) gas condition. Corrosion products on the surface were identified by X-ray diffraction and scanning electron microscopy. Fe-based high chrome alloy, SUS 310 and Ni-based high chrome alloy, Hastelloy X showed good corrosion resistance up to 600 ℃ and 1.7% H2S condition. The activation energys for the sulphidation reactions tested in the N2(dry) condition were 68 to 157 kJ/mol. The corrosion rate was greatly increased with increasing H2S gas concentration in the range of 0.3-4.99% H2S, that is, from 6 mg/dm(2)ㆍday to 314 mg/dm(2)ㆍday for SUS 316, and from 5 mg/dm(2)ㆍday to 336 mg/dm(2)ㆍday for Hastelloy X. The reaction orders for H2S concentration were about 1.48 to 1.91. The main corrosion products on the surface was indicated as(Fe, Ni)sulphides.
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