슈퍼오스테나이트 스테인리스강의 순환동전위 분극특성에 미치는 해수온도의 영향과 손상 거동에 관한 미시적 분석
Effect of Seawater Temperature on the Cyclic Potentiodynamic Polarization Characteristics and Microscopic Analysis on Damage Behavior of Super Austenitic Stainless Steel
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Because austenitic stainless steel causes localized corrosion such as pitting and crevice corrosion in environmentscontaining chlorine, corrosion resistance is improved by surface treatment or changes of the alloyelement content. Accordingly, research using cyclic potentiodynamic polarization experiment to evaluatethe properties of the passivation film of super austenitic stainless steel that improved corrosion resistance isbeing actively conducted. In this investigation, the electrochemical properties of austenitic stainless steeland super austenitic stainless steel were compared and analyzed through cyclic potentiodynamic polarizationexperiment with varying temperatures. Repassivation properties were not observed in austenitic stainlesssteels at all temperature conditions, but super austenitic stainless steels exhibited repassivationbehaviors at all temperatures. This is expressed as α values using a relational formula comparing the localizedcorrosion rate and general corrosion rate. As the α values of UNS S31603 decreased with temperature,the tendency of general corrosion was expected to be higher, and the α value of UNS N08367increased with increasing temperatures, so it is considered that the tendency of localized corrosion wasdominant.
Abstract
Because austenitic stainless steel causes localized corrosion such as pitting and crevice corrosion in environmentscontaining chlorine, corrosion resistance is improved by surface treatment or changes of the alloyelement content. Accordingly, research using cyclic potentiodynamic polarization experiment to evaluatethe properties of the passivation film of super austenitic stainless steel that improved corrosion resistance isbeing actively conducted. In this investigation, the electrochemical properties of austenitic stainless steeland super austenitic stainless steel were compared and analyzed through cyclic potentiodynamic polarizationexperiment with varying temperatures. Repassivation properties were not observed in austenitic stainlesssteels at all temperature conditions, but super austenitic stainless steels exhibited repassivationbehaviors at all temperatures. This is expressed as α values using a relational formula comparing the localizedcorrosion rate and general corrosion rate. As the α values of UNS S31603 decreased with temperature,the tendency of general corrosion was expected to be higher, and the α value of UNS N08367increased with increasing temperatures, so it is considered that the tendency of localized corrosion wasdominant.
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