Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Austenitizing Temperatures on Corrosion Resistance of 420J2 Stainless Steel

420J2 강의 내식성에 미치는 오스테나이트화 온도의 영향

  • Kim, H.J. (Division of Materials Science & Engineering, Pukyong University) ;
  • Jung, B.H. (Division of Materials Science & Engineering, Pukyong University)
  • 김헌주 (부경대학교 신소재공학부) ;
  • 정병호 (부경대학교 신소재공학부)
  • Received : 2006.04.30
  • Accepted : 2008.05.22
  • Published : 2008.05.31
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Abstract

The effects of austenitizing temperature in a range of $1000{\sim}1150^{\circ}C$ on the corrosion resistance in 420J2 stainless steel tempered at $150^{\circ}C$ were investigated by an electrochemical uniform corrosion test in a solution of 0.5M $H_2S0_4$. Pitting test and DL-EPR test for intergranular corrosion were carried out in a solution of 3.5% NaCl and 0.5M $H_2S0_4$ + 0.01 M KSCN respectively. In uniform corrosion test, specimens austenitized below $1100^{\circ}C$ showed similar corrosion current density and passive current density, whereas specimens austenitized at $1150^{\circ}C$ showed a little higher values. Pitting potential slightly increased with an increase of austenitizing temperature. The degree of sensitization, DOS, also slightly increased with an increase of austenitizing temperature, reaching the highest degree at $1150^{\circ}C$. It was expected that the increase of DOS was due to the larger grain size rather than the dissolved precipitates in the matrix.

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References

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