[논문]다구찌 설계를 이용한 듀플렉스 스테인리스강 S31083용 DL-EPR 시험용액의 최적화

정광후; 김성종

doi:10.14773/cst.2021.20.2.77

[국내논문] 다구찌 설계를 이용한 듀플렉스 스테인리스강 S31083용 DL-EPR 시험용액의 최적화
Optimization of DL-EPR Test Solution for Duplex Stainless Steel S31083 Using Taguchi Design 원문보기

Corrosion science and technology, v.20 no.2, 2021년, pp.77 - 84

정광후 (한국해양수산연수원 목포분원) , 김성종 (목포해양대학교기관시스템공학부)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (9)

표 Table 1. Designed factors and their levels
그림 Fig. 1. DL-EPR curves for some experimental condition in L₁₆ orthogonal array
표 Table 2. L₁₆ orthogonal array with design factors and their levels
표 Table 3. Experimental results on the L₁₆ orthogonal array
표 Table 4. Response table of mean S/N ratio for DOS and I_a
그림 Fig. 2. Main effect plot for S/N ratio: a) DOS is larger than better, b) I_a is smaller than better, c) normalized S/N ratio for Fig. 2(a,b)
그림 Fig. 4. Surface morphologies after DL-EPR test: a) not-treated specimen under A4B4C4D4, b) 3 hours specimen under A4B4C4D4, c) not-treated specimen under A3B3C3D3, d) 3 hours specimen under A3B3C3D3
그림 Fig. 3. DL-EPR test value(DOS) with various conditions
그림 Fig. 5. DL-EPR test values with various temperature and time under modified optimum condition

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