Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Corrosion Characteristics of a 5Cr-1Mo Steel Specimen by Sodium-Water Reaction

나트륨-물 반응에 의한 5Cr-1Mo Steel 시편의 부식특성

  • Jeong, Kyung-Chai (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Jeong, Ji-Yeong (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Park, Jin-Ho (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Hwang, Sung-Tai (Korea Atomic Energy Research Institute, KALIMER Verification Test Lab.) ;
  • Kim, Eui-Sik (Department of Chemical Engineering, Chungbuk National University)
  • 정경채 (한국원자력연구소 KALlMER 검증시험 Lab.) ;
  • 정지영 (한국원자력연구소 KALlMER 검증시험 Lab.) ;
  • 박진호 (한국원자력연구소 KALlMER 검증시험 Lab.) ;
  • 황성태 (한국원자력연구소 KALlMER 검증시험 Lab.) ;
  • 김의식 (충북대학교 화학공학과)
  • Received : 1998.06.16
  • Accepted : 1998.09.09
  • Published : 1998.12.10
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Abstract

Small water leak experiment was carried out for the 5Cr-1Mo steel specimen in sodium atmosphere. Perfect re-open time for the leak path of a specimen, by micro leak, was 129 minutes, and its size observed about 2 mm diameter at sodium side. The halos phenomena appeared around of leak spot before the leak path has re-opened, and the size of halos observed was different from the real re-open size of a specimen. Also, the corrosion of a specimen initiated from sodium side, but it did not occur at steam side. In AES analysis, the segregation phenomena of Cr in the specimen was found much more than those of other elements. And also, the sodium compounds formed by sodium-water reaction and deposited onto the leak site of specimen were observed by EPMA analysis and SEM photograph. It is postulated that the corrosion products could be precipitated to form mixed Na Fe Cr compounds.

5Cr-1Mo steel을 이용하여 나트륨 분위기에서 미량 물 누출 실험을 수행하였다. 시편에서 미량 물 누출로 인한 누출경로의 완전 re-open time은 129분으로 나타났고, 그 크기는 직경 2mm를 나타냈다. 누출경로는 re-open되기 전에 누출부위를 중심으로 halos현상을 형성하였으며, halos의 크기와 실제 re-open크기와는 다르게 나타났다. 나트륨-물 반응으로 인한 재질의 부식은 나트륨부위로부터 시작되었으며, steam 부위에서는 부식이 발생하지 않았다. 시편 누출부위를 AES로 분석한 결과 Cr의 segregation이 가장 많이 나타났으며, SEM과 EPMA 관찰로부터 나트륨화합물들이 누출부위 주변에 대량 침적되어 있는 것이 관찰되어 나트륨 철 크롬혼합물 형태로 부식생성물들이 혼재되어 있는 것으로 예측되었다.

Keywords

Acknowledgement

Grant : 원자력개발 중장기 과제

Supported by : 과기부

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