Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Evaluation on Resistance to Pitting Corrosion of Fe-Cr Alloys via Measurement of the Critical Pitting Temperature (CPT) and Potentiodynamic Polarization According to KS D 0238 (wet, dry), ASTM G 61 and ISO 17475 Standards

Fe-Cr합금의 공식저항성 평가를 위하여 다양한 규격(KS D 0238, ASTM G 61, ISO 17475)에 따라 실시한 동전위 분극 시험과 임계공식온도 측정시험

  • Kang, Su-Yeon (School of Advanced Materials Engineering, Kookmin University) ;
  • Lee, Jae-Bong (School of Advanced Materials Engineering, Kookmin University) ;
  • Kim, Yeong-Ho (Stainless steel Research Group, POSCO)
  • 강수연 (국민대학교 공과대학 신소재 공학부) ;
  • 이재봉 (국민대학교 공과대학 신소재 공학부) ;
  • 김영호 (포스코 STS연구그룹)
  • Received : 2008.02.18
  • Published : 2009.10.25
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Abstract

The resistance to pitting corrosion of Fe-Cr alloys was evaluated by performing potentiodynamic polarization and critical pitting temperature (CPT) tests. For the potentiodynamic polarization tests, various standards were applied, i.e., KS D 0238 (wet, dry), ASTM G 61, and ISO 17475, showing different potentiodynamic polarization results including pitting potentials. ASTM G 61 and ISO 17475 standards presented relatively higher pitting potential while KS D 0238 (dry) indicated lower values than the others. Effects of surface roughness, scan rates, and exposure time to air before tests were also investigated. CPT tests were performed under two different applied potentials, 300 m$V_{SCE}$ and 200 m$V_{SCE}$ in deaerated 1 M NaCl aqueous solution. CPT values and the polarization test results showed a linear relationship.

Keywords

Acknowledgement

Supported by : POSCO

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