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http://dx.doi.org/10.14773/cst.2021.20.5.266

Effect of Temperature on Electrochemical Characteristics of Stainless Steel in Green Death Solution Using Cyclic Potentiodynamic Polarization Test  

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.5, 2021 , pp. 266-280 More about this Journal
Abstract
Since 2020, the International Maritime Organization (IMO) has updated regulations on the sulfur content to be less than 0.5% in exhaust gas emitted from ships. Accordingly, the exhaust gas post-treatment device for ships, which is SOx/NOx reduction technology, was introduced. However, the exhaust gas post-treatment device is suffering corrosion because of the harsh corrosive environment formed by sulfate and chlorine oxide through the desulfurization process. In this investigation, cyclic potentiodynamic polarization (CPDP) experiment for UNS S31603 and UNS N08367 was performed in a green death solution that simulates the environment of a desulfurization device. The corrosion rate of UNS S31603 at the highest temperature was about 3 times higher than that of UNS N83067. Also, electron microscope scan revealed corrosion type UNS N83067 presents intergranular corrosion tendency. On the other hand, UNS S31603 was observed as general corrosion. The α values of UNS N08367 at 30 ℃ and 60 ℃ were higher than those of UNS S31603, thus UNS N08367 is considered to have a higher local damage tendency. Whereas, since the α value of UNS S31603 at 90 ℃ is larger than that of UNS N08367, UNS S31603 is considered to have a higher local damage trend.
Keywords
UNS S31603; UNS N08367; Green death solution; Temperature; Cyclic potentiodynamic polarization;
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Times Cited By KSCI : 2  (Citation Analysis)
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