슈퍼오스테나이트 스테인리스강의 순환동전위 분극특성에 미치는 해수온도의 영향과 손상 거동에 관한 미시적 분석

• Published in: Corrosion science and technology Vol. 20; no. 6; pp. 412 - 425
• Main Authors: 황현규, Hyun-kyu Hwang, 김성종, Seong-jong Kim
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 31.12.2021
• Subjects: Cyclic potentiodynamic polarization; Sea water; Temperature; UNS N08367; UNS S31603; 금속공학; UNS N08367; Temperature; UNS S31603; Cyclic potentiodynamic polarization; Sea water
• ISSN: 1598-6462; 2288-6524
• DOI: 10.14773/cst.2021.20.6.412

Because austenitic stainless steel causes localized corrosion such as pitting and crevice corrosion in environments containing chlorine, corrosion resistance is improved by surface treatment or changes of the alloy element content. Accordingly, research using cyclic potentiodynamic polarization experiment to evaluate the properties of the passivation film of super austenitic stainless steel that improved corrosion resistance is being actively conducted. In this investigation, the electrochemical properties of austenitic stainless steel and super austenitic stainless steel were compared and analyzed through cyclic potentiodynamic polarization experiment with varying temperatures. Repassivation properties were not observed in austenitic stainless steels at all temperature conditions, but super austenitic stainless steels exhibited repassivation behaviors at all temperatures. This is expressed as α values using a relational formula comparing the localized corrosion 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 N08367 increased with increasing temperatures, so it is considered that the tendency of localized corrosion was dominant.