Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy
The Fe30Mn5Al alloy was oxidized at 800℃ in air for 160h, the oxidation-induced layer about 15μm thick near the scale-metal interface was induced to transform to ferrite and become enriched in Fe and depletion in Mn. The effect of the oxidation-induced Mn depletion layer on the electrochemical corro...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2017-08-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/Y2017/V45/I8/83 |
| _version_ | 1797968119040311296 |
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| author | ZHU Xue-mei ZHANG Zhen-wei WANG Xin-jian ZHANG Yan-sheng |
| author_facet | ZHU Xue-mei ZHANG Zhen-wei WANG Xin-jian ZHANG Yan-sheng |
| author_sort | ZHU Xue-mei |
| collection | DOAJ |
| description | The Fe30Mn5Al alloy was oxidized at 800℃ in air for 160h, the oxidation-induced layer about 15μm thick near the scale-metal interface was induced to transform to ferrite and become enriched in Fe and depletion in Mn. The effect of the oxidation-induced Mn depletion layer on the electrochemical corrosion behavior of Fe30Mn5Al alloy was evaluated. The results show that in 1mol·L<sup>-1</sup> Na<sub>2</sub>SO<sub>4</sub> solution, the anodic polarization curve of the Mn depletion layer exhibits self-passivation, compared with Fe30Mn5Al austenitic alloy, and the corrosion potential <i>E</i><sub><i>vs</i> SCE</sub> is increased to -130mV from -750mV and the passive current density i<sub>p</sub> is decreased to 29μA/cm<sup>2</sup> from 310μA/cm<sup>2</sup>. The electrochemical impedance spectroscopy(EIS) of the Mn depletion layer has the larger diameter of capacitive arc, the higher impedance modulus|<i>Z</i>|, and the wider phase degree range, and the fitted polarization resistant <i>R</i><sub>t</sub> is increased to 9.9kΩ·cm<sup>2</sup> from 2.7kΩ·cm<sup>2</sup> by using an equivalent electric circuit of <i>R</i><sub>s</sub>-(<i>R</i><sub>t</sub>//CPE). The high insulation of the Mn depletion layer leads to an improved corrosion resistance of Fe30Mn5Al austenitic alloy. |
| first_indexed | 2024-04-11T02:41:53Z |
| format | Article |
| id | doaj.art-1a0dac5b4b944a30ab6ab9b4360a7e18 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:41:53Z |
| publishDate | 2017-08-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-1a0dac5b4b944a30ab6ab9b4360a7e182023-01-02T18:50:39ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812017-08-01458838710.11868/j.issn.1001-4381.2015.001006201708001006Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al AlloyZHU Xue-mei0ZHANG Zhen-wei1WANG Xin-jian2ZHANG Yan-sheng3School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, ChinaSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, ChinaSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, ChinaSchool of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, ChinaThe Fe30Mn5Al alloy was oxidized at 800℃ in air for 160h, the oxidation-induced layer about 15μm thick near the scale-metal interface was induced to transform to ferrite and become enriched in Fe and depletion in Mn. The effect of the oxidation-induced Mn depletion layer on the electrochemical corrosion behavior of Fe30Mn5Al alloy was evaluated. The results show that in 1mol·L<sup>-1</sup> Na<sub>2</sub>SO<sub>4</sub> solution, the anodic polarization curve of the Mn depletion layer exhibits self-passivation, compared with Fe30Mn5Al austenitic alloy, and the corrosion potential <i>E</i><sub><i>vs</i> SCE</sub> is increased to -130mV from -750mV and the passive current density i<sub>p</sub> is decreased to 29μA/cm<sup>2</sup> from 310μA/cm<sup>2</sup>. The electrochemical impedance spectroscopy(EIS) of the Mn depletion layer has the larger diameter of capacitive arc, the higher impedance modulus|<i>Z</i>|, and the wider phase degree range, and the fitted polarization resistant <i>R</i><sub>t</sub> is increased to 9.9kΩ·cm<sup>2</sup> from 2.7kΩ·cm<sup>2</sup> by using an equivalent electric circuit of <i>R</i><sub>s</sub>-(<i>R</i><sub>t</sub>//CPE). The high insulation of the Mn depletion layer leads to an improved corrosion resistance of Fe30Mn5Al austenitic alloy.http://jme.biam.ac.cn/CN/Y2017/V45/I8/83Fe30Mn5Al alloyoxidation layeranodic polarizationelectrochemical impedance spectroscopy |
| spellingShingle | ZHU Xue-mei ZHANG Zhen-wei WANG Xin-jian ZHANG Yan-sheng Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy Cailiao gongcheng Fe30Mn5Al alloy oxidation layer anodic polarization electrochemical impedance spectroscopy |
| title | Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy |
| title_full | Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy |
| title_fullStr | Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy |
| title_full_unstemmed | Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy |
| title_short | Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy |
| title_sort | electrochemical corrosion behavior of oxidation layer on fe30mn5al alloy |
| topic | Fe30Mn5Al alloy oxidation layer anodic polarization electrochemical impedance spectroscopy |
| url | http://jme.biam.ac.cn/CN/Y2017/V45/I8/83 |
| work_keys_str_mv | AT zhuxuemei electrochemicalcorrosionbehaviorofoxidationlayeronfe30mn5alalloy AT zhangzhenwei electrochemicalcorrosionbehaviorofoxidationlayeronfe30mn5alalloy AT wangxinjian electrochemicalcorrosionbehaviorofoxidationlayeronfe30mn5alalloy AT zhangyansheng electrochemicalcorrosionbehaviorofoxidationlayeronfe30mn5alalloy |