Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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Corrosion and Oxidation Properties of Ni-Base Superalloy KM 1557

Ni기 초내열 단조합금 KM 1557의 부식 및 산화성질

  • Choi, Hyoung Il (Steel Pipe Research Team, Dong Bu Steel Co., Ltd.) ;
  • Kim, Hyon Tae (Special Alloy Research Lab., Korea Institute of Science and Technology) ;
  • Kim, Young Do (Special Alloy Research Lab., Korea Institute of Science and Technology) ;
  • Yoon, Kook Han (Special Alloy Research Lab., Korea Institute of Science and Technology) ;
  • Yoo, Myoung Ki (Special Alloy Research Lab., Korea Institute of Science and Technology) ;
  • Kwun, Sook In (Department of Metallurgical Engineering, Korea University) ;
  • Choi, Ju (Special Alloy Research Lab., Korea Institute of Science and Technology)
  • 최형일 (동부제강(주) 기술연구소 강관연구팀) ;
  • 김현태 (한국과학기술연구원 특수강연구실) ;
  • 김영도 (한국과학기술연구원 특수강연구실) ;
  • 윤국한 (한국과학기술연구원 특수강연구실) ;
  • 유명기 (한국과학기술연구원 특수강연구실) ;
  • 권숙인 (고려대학교 금속공학과) ;
  • 최주 (한국과학기술연구원 특수강연구실)
  • Received : 1992.03.17
  • Published : 1992.03.25
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Abstract

Corrosion resistances in various acids and high temperature oxidation properties have been investigated for the Ni-base superalloy KM 1557. Corrosion tests were performed in $H_2SO_4$, HCl, $HNO_3$, $H_3PO_4$ and $CH_3COOH$. Oxidation tests were carried out in air for 20 and 110hrs at $900^{\circ}C$, $950^{\circ}C$ and $1050^{\circ}C$. Hot corrosion tests were done in salt bath of 75% $Na_2SO_4-25%$ NaCl at $900^{\circ}C$ for 20hrs. After the tests, the samples were observed by optical microscopy and analysed by EPMA and X-ray mapping in order to investigate the distribution of composition. It was shown that corrosion resistances in various acids and hot salt bath were proven to be excellent. It was suggested that the amounts of oxides were determined mainly by the depth of internal and intergranular $Al_2O_3$ oxide layers.

본 연구는 니켈기 초내열 합금 KM 1557의 내식성 및 고온 산화 성질을 조사하기 위하여 황산, 염산, 질산, 인산 및 초산에서의 부식시험과 $900^{\circ}C$, $950^{\circ}C$, $1050^{\circ}C$에서의 고온산화시험, 그리고 $900^{\circ}C$에서 75% $Na_2SO_4-25%$ NaCl 염욕에서 고온황화 침지시험을 실시하였다. 각 시험 후 시편의 단면을 광학현미경으로 관찰하였으며, EPMA 및 X-ray mapping으로 분석하여 시편의 조성분포를 조사하였다. 각종 산에서의 내식성 및 염욕에서의 고온 내식성은 우수하였으며 고온산화시험 결과 산화물의 양은 내부 및 입계간 산화물인 $Al_2O_3$층의 깊이에 주로 영향을 받는 것으로 나타났다.

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