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http://dx.doi.org/10.14773/cst.2021.20.6.412

Effect of Seawater Temperature on the Cyclic Potentiodynamic Polarization Characteristics and Microscopic Analysis on Damage Behavior of Super Austenitic Stainless Steel  

Hwang, Hyun-Kyu (Graduate school, Mokpo national maritime university)
Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
Publication Information
Corrosion Science and Technology / v.20, no.6, 2021 , pp. 412-425 More about this Journal
Abstract
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.
Keywords
UNS S31603; UNS N08367; Sea water; Temperature; Cyclic potentiodynamic polarization;
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