Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Optimization of DL-EPR Test Solution for Duplex Stainless Steel S31083 Using Taguchi Design

다구찌 설계를 이용한 듀플렉스 스테인리스강 S31083용 DL-EPR 시험용액의 최적화

  • Jung, Kwang-Hu (Mokpo branch, Korea institute of maritime and fisheries technology) ;
  • Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
  • 정광후 (한국해양수산연수원 목포분원) ;
  • 김성종 (목포해양대학교기관시스템공학부)
  • Received : 2021.04.09
  • Accepted : 2021.04.15
  • Published : 2021.04.30
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Abstract

This study aims to optimize the DL-EPR test solution for duplex stainless steel S31083 using the Taguchi design. The test solution parameters applied to the Taguchi design are H2SO4, NaCl, KSCN concentration, and temperature. In the experimental design, an orthogonal array of 4 levels 4 factor L16(44) was used. Output values for the orthogonal array were used for resolution (degree of sensitization) and selective etch (Ia) values. The optimal test solution conditions were selected by comparing the normalized S/N ratio for the two reaction properties. As a result, the H2SO4 and NaCl were identified as the main factors influencing the sensitivity measurement, but the delta statistics showed that the KSCN concentration and temperature had relatively low influence. The optimal condition was identified as 1.5 M H2SO4+0.03 M KSCN+1.5M NaCl at 30 ℃. The degree of sensitization presented a tendency to depend on the heat treatment temperature and time in the optimal test solution. This investigation confirmed the possibility of optimizing the experiment solution for the DL-EPR test of stainless steel using the Taguchi technique.

Keywords

Acknowledgement

이 논문은 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(선박 배출 대기오염물질 동시저감 후처리시스템 실증 및 인증체계 구축).

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