Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test

Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test

Intergranular corrosion (IGC) of Nb-Ti stabilized ferritic stainless steel (FSS) 429 was investigated using the double loop electrochemical potentiokinetic reactivation (DL-EPR) test combined with the microstructure observation. The results indicated that the optimized DL-EPR test condition for FSS...

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Main Authors: Xiao-lei Li, Yi-fan Ni, Yi-ming Jiang, Jin Li, Li Li
Format: Article
Language:English
Published: Hindawi Limited 2015-01-01
Series:Advances in Materials Science and Engineering
Online Access:http://dx.doi.org/10.1155/2015/716874
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spelling doaj-3e2c3fa484eb4c65b6da6031dd5dded92020-11-25T00:14:34ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422015-01-01201510.1155/2015/716874716874Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation TestXiao-lei Li0Yi-fan Ni1Yi-ming Jiang2Jin Li3Li Li4The Center of Analysis and Measurement, Fudan University, Shanghai 200433, ChinaDepartment of Materials Science, Fudan University, Shanghai 200433, ChinaDepartment of Materials Science, Fudan University, Shanghai 200433, ChinaDepartment of Materials Science, Fudan University, Shanghai 200433, ChinaThe Center of Analysis and Measurement, Fudan University, Shanghai 200433, ChinaIntergranular corrosion (IGC) of Nb-Ti stabilized ferritic stainless steel (FSS) 429 was investigated using the double loop electrochemical potentiokinetic reactivation (DL-EPR) test combined with the microstructure observation. The results indicated that the optimized DL-EPR test condition for FSS 429 was the solution of 0.5 M H2SO4 + 0.0001 M KSCN with a scanning rate of 100 mV/min at 30°C. Based on this condition, the specimens aging at 400–700°C for different duration were tested and a time-temperature-sensitization (TTS) curve for FSS 429 was obtained, which reveals the sensitization nose was located around 550°C. The critical Ir/Ia value was determined to be about 3% above which IGC occurred. After aging treatment, Cr depletion zone was detected using energy dispersive spectroscopy (EDS), most possibly due to Cr segregation around intergranular TiC and NbC.http://dx.doi.org/10.1155/2015/716874
collection DOAJ
language English
format Article
sources DOAJ
author Xiao-lei Li
Yi-fan Ni
Yi-ming Jiang
Jin Li
Li Li
spellingShingle Xiao-lei Li
Yi-fan Ni
Yi-ming Jiang
Jin Li
Li Li
Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
Advances in Materials Science and Engineering
author_facet Xiao-lei Li
Yi-fan Ni
Yi-ming Jiang
Jin Li
Li Li
author_sort Xiao-lei Li
title Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
title_short Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
title_full Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
title_fullStr Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
title_full_unstemmed Intergranular Corrosion of Low Cr Ferritic Stainless Steel 429 Evaluated by the Optimized Double Loop Electrochemical Potentiokinetic Reactivation Test
title_sort intergranular corrosion of low cr ferritic stainless steel 429 evaluated by the optimized double loop electrochemical potentiokinetic reactivation test
publisher Hindawi Limited
series Advances in Materials Science and Engineering
issn 1687-8434
1687-8442
publishDate 2015-01-01
description Intergranular corrosion (IGC) of Nb-Ti stabilized ferritic stainless steel (FSS) 429 was investigated using the double loop electrochemical potentiokinetic reactivation (DL-EPR) test combined with the microstructure observation. The results indicated that the optimized DL-EPR test condition for FSS 429 was the solution of 0.5 M H2SO4 + 0.0001 M KSCN with a scanning rate of 100 mV/min at 30°C. Based on this condition, the specimens aging at 400–700°C for different duration were tested and a time-temperature-sensitization (TTS) curve for FSS 429 was obtained, which reveals the sensitization nose was located around 550°C. The critical Ir/Ia value was determined to be about 3% above which IGC occurred. After aging treatment, Cr depletion zone was detected using energy dispersive spectroscopy (EDS), most possibly due to Cr segregation around intergranular TiC and NbC.
url http://dx.doi.org/10.1155/2015/716874
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