Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Temperature on Electrochemical Characteristics of Stainless Steel in Green Death Solution Using Cyclic Potentiodynamic Polarization Test

순환동전위 분극실험을 이용한 스테인리스강의 그린데스용액에서 전기화학적 특성에 미치는 온도의 영향

  • Hwang, Hyun-Kyu (Graduate school, Mokpo national maritime university) ;
  • Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
  • 황현규 (목포해양대학교 대학원) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2021.09.30
  • Accepted : 2021.10.06
  • Published : 2021.10.31
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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

Acknowledgement

This research was a part of the project titled 'Demonstration of aftertreatment systems of Ship's air pollutant (NOx/SOx/PM) and establishment of their certification system', funded by the Ministry of Oceans and Fisheries, Korea.

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