산성 염화물 환경에서 F53 슈퍼 듀플렉스 스테인리스강의 2 상간의 공식 거동 연구

김순태; 공경호; 이인성; 박용수; 이종훈; 김두현

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자료유형: 학술저널

저자정보: 김순태 공경호 이인성 박용수 이종훈 김두현

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제13권 제3호

발행연도: 2014.1

수록면: 95 - 101 (7page)

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The pitting corrosion behaviors between the constituent phases in F53 super duplex stainless steel (SDSS)in acidified chloride environments were investigated using a critical pitting corrosion temperature test, apotentiodynamic anodic polarization test, and the microstructure analyses through a SEM-EDS and a SAM. As the solution annealing temperature decreased from 1150℃ to 1050℃, the γ-phase fraction increasedwhereas the α-phase fraction decreased. The pitting potential and the critical pitting temperature increasedwith a decrease of solution annealing temperature, thereby increasing the resistance to pitting corrosion. The pitting corrosion of the SDSS was selectively initiated at the α-phases because the PREN (pitting resistanceequivalent number, PREN = %Cr+3.3%Mo+30%N) value of the γ-phase is much larger than that of theα-phase, irrespective of the solution annealing temperature. The pitting corrosion was finally propagatedfrom the α-phase to the γ-phase. The decrease of solution annealing temperature enhanced the resistanceto pitting corrosion greatly in acidified chloride environments due to a decrease of PREN difference betweenthe γ-phase and the α-phase, that is, a decrease of PRENγ by dilution of N in γ-phase with an increasein the γ-phase volume fraction and an increase of PRENα by enrichment of Cr and Mo in the α-phasewith a decrease in the α-phase volume fraction.

#super duplex stainless steel #potentiodynamic polarization #critical pitting temperature #SEM-EDS #PREN

참고문헌 (27)

참고문헌 신청

/ / ASTM E562?02, Standard test method for determining volume fraction by systematic manual point count / Annual Book of ASTM Standards

/ / ASTM G 48-method E, Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution / Annual Book of A

/ / ASTM G 5?04, Standard reference test method for making potentiostatic and potentiodynamic anodic polarization measurements / Annual Book of ASTM Standards

A. Igual Munoz / 2007 / / Corros. Sci 49 : 3200 ~

A. M. do Nascimento / 2008 / / Mater. Charact 59 : 1736 ~