Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel
The effects of C-substitution for part of the N content, on the pitting corrosion resistance and repassivation tendencies of duplex stainless steels (DSSs) were investigated. For this investigation, normal UNS S32205 containing N only (DSS-N) and the C-substituted DSS (DSS-NC) were fabricated. Micro...
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MDPI AG
2019-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/9/930 |
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| author | Hanme Yoon Heon-Young Ha Tae-Ho Lee Sung-Dae Kim Jae Hoon Jang Joonoh Moon Namhyun Kang |
| author_facet | Hanme Yoon Heon-Young Ha Tae-Ho Lee Sung-Dae Kim Jae Hoon Jang Joonoh Moon Namhyun Kang |
| author_sort | Hanme Yoon |
| collection | DOAJ |
| description | The effects of C-substitution for part of the N content, on the pitting corrosion resistance and repassivation tendencies of duplex stainless steels (DSSs) were investigated. For this investigation, normal UNS S32205 containing N only (DSS-N) and the C-substituted DSS (DSS-NC) were fabricated. Microstructural analyses confirmed that the two DSSs had dual-phase microstructures without precipitates, and they possessed similar initial microstructure, including their grain sizes and phase fractions. Polarization and immersion tests performed in concentrated chloride solutions revealed that the DSS-NC was more resistant against stable pitting corrosion and possessed a higher repassivation tendency than the DSS-N. Furthermore, the corrosion pits initiated and propagated to a less corrosion resistant α phase. Polarization tests and corrosion depth measurements conducted in an HCl solution indicated that the DSS-NC exhibited lower galvanic corrosion rate between the α and γ phases than the DSS-N. Therefore, the growth rate of pit embryo was lowered in the DSS-NC, which shifted the potentials for the stable pit initiation and the pit extinction to the higher values. |
| first_indexed | 2024-12-13T05:21:18Z |
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| id | doaj.art-d34a2d4543b4452ca0c1c097afbb29a5 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-13T05:21:18Z |
| publishDate | 2019-08-01 |
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| spelling | doaj.art-d34a2d4543b4452ca0c1c097afbb29a52022-12-21T23:58:19ZengMDPI AGMetals2075-47012019-08-019993010.3390/met9090930met9090930Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless SteelHanme Yoon0Heon-Young Ha1Tae-Ho Lee2Sung-Dae Kim3Jae Hoon Jang4Joonoh Moon5Namhyun Kang6Department of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaFerrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, KoreaFerrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, KoreaFerrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, KoreaFerrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, KoreaFerrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaThe effects of C-substitution for part of the N content, on the pitting corrosion resistance and repassivation tendencies of duplex stainless steels (DSSs) were investigated. For this investigation, normal UNS S32205 containing N only (DSS-N) and the C-substituted DSS (DSS-NC) were fabricated. Microstructural analyses confirmed that the two DSSs had dual-phase microstructures without precipitates, and they possessed similar initial microstructure, including their grain sizes and phase fractions. Polarization and immersion tests performed in concentrated chloride solutions revealed that the DSS-NC was more resistant against stable pitting corrosion and possessed a higher repassivation tendency than the DSS-N. Furthermore, the corrosion pits initiated and propagated to a less corrosion resistant α phase. Polarization tests and corrosion depth measurements conducted in an HCl solution indicated that the DSS-NC exhibited lower galvanic corrosion rate between the α and γ phases than the DSS-N. Therefore, the growth rate of pit embryo was lowered in the DSS-NC, which shifted the potentials for the stable pit initiation and the pit extinction to the higher values.https://www.mdpi.com/2075-4701/9/9/930duplex stainless steelpitting corrosionrepassivation behaviorgalvanic corrosion |
| spellingShingle | Hanme Yoon Heon-Young Ha Tae-Ho Lee Sung-Dae Kim Jae Hoon Jang Joonoh Moon Namhyun Kang Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel Metals duplex stainless steel pitting corrosion repassivation behavior galvanic corrosion |
| title | Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel |
| title_full | Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel |
| title_fullStr | Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel |
| title_full_unstemmed | Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel |
| title_short | Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel |
| title_sort | pitting corrosion resistance and repassivation behavior of c bearing duplex stainless steel |
| topic | duplex stainless steel pitting corrosion repassivation behavior galvanic corrosion |
| url | https://www.mdpi.com/2075-4701/9/9/930 |
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