Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel
Reasonable regulation of nonmetallic inclusions in steel can significantly improve its strength, toughness, and corrosion resistance. In this paper, EH420 marine steel was treated with Mg, Ce, and Mg-Ce to modify the inclusions. The effects of different treatments on the morphology, composition, siz...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/7/1244 |
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| author | Zhihong Guo Erkang Liu Qi Wang Xiangjie Lou Hongbo Liu Yaxu Zheng Bo Wang Liguang Zhu |
| author_facet | Zhihong Guo Erkang Liu Qi Wang Xiangjie Lou Hongbo Liu Yaxu Zheng Bo Wang Liguang Zhu |
| author_sort | Zhihong Guo |
| collection | DOAJ |
| description | Reasonable regulation of nonmetallic inclusions in steel can significantly improve its strength, toughness, and corrosion resistance. In this paper, EH420 marine steel was treated with Mg, Ce, and Mg-Ce to modify the inclusions. The effects of different treatments on the morphology, composition, size distribution, induced intragranular ferrite (IGF) nucleation, and pitting resistance of inclusions were systematically analyzed using various methods. The results show that the Mg-Ce composite treatment can modify irregular MgAl<sub>2</sub>O<sub>4</sub> inclusions into spherical Mg-Ce-O composite inclusions and MgO-dominated inclusions. The density of inclusions is increased from 74.8/mm<sup>2</sup> to 186.0/mm<sup>2</sup>, and the average size of inclusions is decreased from 2.60 μm to 1.07 μm. The Mg-Ce-O composite inclusions are effective inclusions for inducing IGF. Furthermore, the pitting potential is increased from −503 mV to −487 mV, and the corrosion rate is decreased. The order of average electronic work function is ΦMgO < ΦCe<sub>2</sub>O<sub>3</sub> < Φα-Fe < ΦAl<sub>2</sub>O<sub>3</sub>. Ce<sub>2</sub>O<sub>3</sub> is hard to induce pitting corrosion due to its similar electronic work function to the steel matrix. Thus, the Mg-Ce composite treatment is better than that for Mg and Ce treatment alone, and has better application prospects. |
| first_indexed | 2024-03-11T00:49:40Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T00:49:40Z |
| publishDate | 2023-07-01 |
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| series | Metals |
| spelling | doaj.art-3a8dd270fa414e14a556dd984af9c0552023-11-18T20:29:57ZengMDPI AGMetals2075-47012023-07-01137124410.3390/met13071244Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine SteelZhihong Guo0Erkang Liu1Qi Wang2Xiangjie Lou3Hongbo Liu4Yaxu Zheng5Bo Wang6Liguang Zhu7Hebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaTechnology Research Institute, HBIS Group Co., Ltd., Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaHebei Key Laboratory of Materials Near-Net Forming Technology, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, ChinaReasonable regulation of nonmetallic inclusions in steel can significantly improve its strength, toughness, and corrosion resistance. In this paper, EH420 marine steel was treated with Mg, Ce, and Mg-Ce to modify the inclusions. The effects of different treatments on the morphology, composition, size distribution, induced intragranular ferrite (IGF) nucleation, and pitting resistance of inclusions were systematically analyzed using various methods. The results show that the Mg-Ce composite treatment can modify irregular MgAl<sub>2</sub>O<sub>4</sub> inclusions into spherical Mg-Ce-O composite inclusions and MgO-dominated inclusions. The density of inclusions is increased from 74.8/mm<sup>2</sup> to 186.0/mm<sup>2</sup>, and the average size of inclusions is decreased from 2.60 μm to 1.07 μm. The Mg-Ce-O composite inclusions are effective inclusions for inducing IGF. Furthermore, the pitting potential is increased from −503 mV to −487 mV, and the corrosion rate is decreased. The order of average electronic work function is ΦMgO < ΦCe<sub>2</sub>O<sub>3</sub> < Φα-Fe < ΦAl<sub>2</sub>O<sub>3</sub>. Ce<sub>2</sub>O<sub>3</sub> is hard to induce pitting corrosion due to its similar electronic work function to the steel matrix. Thus, the Mg-Ce composite treatment is better than that for Mg and Ce treatment alone, and has better application prospects.https://www.mdpi.com/2075-4701/13/7/1244inclusionMg-Ce composite treatmentpitting corrosionelectrochemistrysteel |
| spellingShingle | Zhihong Guo Erkang Liu Qi Wang Xiangjie Lou Hongbo Liu Yaxu Zheng Bo Wang Liguang Zhu Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel Metals inclusion Mg-Ce composite treatment pitting corrosion electrochemistry steel |
| title | Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel |
| title_full | Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel |
| title_fullStr | Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel |
| title_full_unstemmed | Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel |
| title_short | Effect of Mg-Ce Treatment on Inclusion Characteristics and Pitting Corrosion Behavior in EH420 Marine Steel |
| title_sort | effect of mg ce treatment on inclusion characteristics and pitting corrosion behavior in eh420 marine steel |
| topic | inclusion Mg-Ce composite treatment pitting corrosion electrochemistry steel |
| url | https://www.mdpi.com/2075-4701/13/7/1244 |
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