[논문]오스테나이트계 중탄소 및 저탄소 스테인리스강의 입계부식 거동 분석

원석연; 김규빈; 유영란; 최승헌; 김영식

doi:10.14773/cst.2022.21.3.230

오스테나이트계 중탄소 및 저탄소 스테인리스강의 입계부식 거동 분석
Intergranular Corrosion Behavior of Medium and Low Carbon Austenitic Stainless Steel 원문보기

Corrosion science and technology, v.21 no.3, 2022년, pp.230 - 241

원석연 (국립안동대학교신소재공학부 청정에너지소재기술연구센터) , 김규빈 (국립안동대학교신소재공학부 청정에너지소재기술연구센터) , 유영란 (국립안동대학교신소재공학부 청정에너지소재기술연구센터) , 최승헌 (국립안동대학교신소재공학부 청정에너지소재기술연구센터) , 김영식 (국립안동대학교신소재공학부 청정에너지소재기술연구센터)

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Austenitic stainless steel has been widely used because of its good corrosion resistance and mechanical properties. However, intergranular corrosion can occur if the alloy is welded or aged. The objective of this study was to determine intergranular corrosion behaviors of austenitic medium carbon (0.05 wt%) and low carbon (0.02 wt%) stainless steel aged at several conditions. Alloys were evaluated according to ASTM A262 Practice A, ISO 12732 DL-EPR (double loop-electrochemical potentiokinetic reactivation) test, and ASTM A262 Practice C. The degree of sensitization and intergranular corrosion rate were obtained. The relationship between the degree of sensitization and the intergranular corrosion rate showed a very large fluctuation. Such behavior might be related to whether two-dimension tests or three-dimension tests were performed. On the other hand, regardless of carbon content of alloys, when the intergranular corrosion rate increased, the degree of sensitization also increased. However, the DL-EPR test showed a higher sensitivity than the Huey test for differentiating the intergranular corrosion property at a low intergranular corrosion rate, while the Huey test had a higher sensitivity than the DL-EPR test for distinguishing the intergranular corrosion property at a high intergranular corrosion rate.

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표/그림 (14)

표 Table 1. Chemical composition of the experimental alloys (wt%)
그림 Fig. 1. Intergranular corrosion rate of 304M stainless steel determined by ASTM A262 Practice C test
그림 Fig. 2. Surface appearance of 304M stainless steel after ASTM A262 Practice C test (SEM, ×500)
그림 Fig. 3. Degree of sensitization of 304M stainless steel determined by ASTM A262 Practice A test
그림 Fig. 4. Degree of sensitization of 304M stainless steel determined by double loop electrochemical potentiokinetic reactivation test of ISO 12732
그림 Fig. 5. Intergranular corrosion rate of 304L stainless steel after ASTM A262 Practice C test
그림 Fig. 6. Surface appearance of 304L stainless steel after ASTM A262 Practice C test (SEM, ×50)
그림 Fig. 7. Degree of sensitization of 304L stainless steel determined by ASTM A262 Practice A test
그림 Fig. 8. Degree of sensitization of 304L stainless steel determined by ISO 12732, Double Loop Electrochemical Potentiokinetic Reactivation test
그림 Fig. 9. Relationship between intergranular corrosion rate and three ranges of DOS by ISO 12732: (a) DOS<0.01, (b) 0.01

그림 Fig. 10. Relationship between intergranular corrosion rate and three kinds of DOS by ASTM A262 Practice A: (a) 304M stainless steel, (b) 304L stainless steel, (c) 304M and 304L stainless steels

그림 Fig. 11. Difference between 3 dimensional test and 2 dimensional test; (a) ASTM A262 Practice C, (b) ISO 12732 and ASTM A262 Practice A

그림 Fig. 12. Relationship between intergranular corrosion rate and three criteria by ASTM A262 Practice C, Practice A, ISO 12372, and ASM

그림 Fig. 13. Effects of carbon segregation and Cr depletion on the sensitivity to detect the degree of sensitization by DL-EPR and Huey tests

표/그림 (14)

표 Table 1. Chemical composition of the experimental alloys (wt%)

그림 Fig. 1. Intergranular corrosion rate of 304M stainless steel determined by ASTM A262 Practice C test

그림 Fig. 2. Surface appearance of 304M stainless steel after ASTM A262 Practice C test (SEM, ×500)

그림 Fig. 3. Degree of sensitization of 304M stainless steel determined by ASTM A262 Practice A test

그림 Fig. 4. Degree of sensitization of 304M stainless steel determined by double loop electrochemical potentiokinetic reactivation test of ISO 12732

그림 Fig. 5. Intergranular corrosion rate of 304L stainless steel after ASTM A262 Practice C test

그림 Fig. 6. Surface appearance of 304L stainless steel after ASTM A262 Practice C test (SEM, ×50)

그림 Fig. 7. Degree of sensitization of 304L stainless steel determined by ASTM A262 Practice A test

그림 Fig. 8. Degree of sensitization of 304L stainless steel determined by ISO 12732, Double Loop Electrochemical Potentiokinetic Reactivation test

그림 Fig. 9. Relationship between intergranular corrosion rate and three ranges of DOS by ISO 12732: (a) DOS<0.01, (b) 0.01

그림 Fig. 10. Relationship between intergranular corrosion rate and three kinds of DOS by ASTM A262 Practice A: (a) 304M stainless steel, (b) 304L stainless steel, (c) 304M and 304L stainless steels

그림 Fig. 11. Difference between 3 dimensional test and 2 dimensional test; (a) ASTM A262 Practice C, (b) ISO 12732 and ASTM A262 Practice A

그림 Fig. 12. Relationship between intergranular corrosion rate and three criteria by ASTM A262 Practice C, Practice A, ISO 12372, and ASM

그림 Fig. 13. Effects of carbon segregation and Cr depletion on the sensitivity to detect the degree of sensitization by DL-EPR and Huey tests

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오스테나이트계 중탄소 및 저탄소 스테인리스강의 입계부식 거동 분석
Intergranular Corrosion Behavior of Medium and Low Carbon Austenitic Stainless Steel 원문보기

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오스테나이트계 중탄소 및 저탄소 스테인리스강의 입계부식 거동 분석 Intergranular Corrosion Behavior of Medium and Low Carbon Austenitic Stainless Steel 원문보기

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오스테나이트계 중탄소 및 저탄소 스테인리스강의 입계부식 거동 분석
Intergranular Corrosion Behavior of Medium and Low Carbon Austenitic Stainless Steel 원문보기

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