Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration
This study explores the development of an organic-inorganic hybrid coating to enhance the corrosion resistance and photocatalytic properties of AZ31 Mg alloy modified by plasma electrolytic oxidation (PEO). The PEO process typically generates a porous oxide layer, which can reduce corrosion protecti...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2025-01-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956724003815 |
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| author | Talitha Tara Thanaa Mohammad Aadil Alireza Askari Arash Fattah-alhosseini Mohammad Alkaseem Mosab Kaseem |
| author_facet | Talitha Tara Thanaa Mohammad Aadil Alireza Askari Arash Fattah-alhosseini Mohammad Alkaseem Mosab Kaseem |
| author_sort | Talitha Tara Thanaa |
| collection | DOAJ |
| description | This study explores the development of an organic-inorganic hybrid coating to enhance the corrosion resistance and photocatalytic properties of AZ31 Mg alloy modified by plasma electrolytic oxidation (PEO). The PEO process typically generates a porous oxide layer, which can reduce corrosion protection by allowing corrosive agents to penetrate the substrate. To address this limitation, phenopyridine (PHEN) and 2-methylimidazole (2-IMD) were incorporated into the PEO surface to form a robust organic layer on the Mg alloy. Potassium hydroxide (KOH) was used to adjust the pH, improving the interaction and solubility between the organic molecules and the PEO coating. The hybrid coating exhibited unique twig-like surface structures that contributed to forming a multifunctional coating with high corrosion resistance and superior photocatalytic activity. The PEO-PHEN-2IMD sample on the Mg alloy demonstrated exceptional corrosion resistance, with the lowest corrosion current density (Icorr) of 1.92 × 10-10 A/cm², a high corrosion potential (Ecorr), and the highest top layer resistance (Rtop) of 2.57 × 106 Ω·cm², indicating excellent barrier properties. Additionally, the coating achieved complete (100%) degradation of methylene blue (MB) within 30 min under visible light. Density Functional Theory (DFT) calculations provide deeper insights into the bonding mechanisms and interaction stability between PHEN, 2-IMD, and the PEO layer on the Mg alloy and MB dye. These findings confirmed the enhanced performance of the hybrid coating in both corrosion resistance and photocatalytic applications. |
| format | Article |
| id | doaj-art-f05b1805f91646738c09d4decd466dc5 |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-f05b1805f91646738c09d4decd466dc52025-02-06T05:11:42ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672025-01-01131260282Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integrationTalitha Tara Thanaa0Mohammad Aadil1Alireza Askari2Arash Fattah-alhosseini3Mohammad Alkaseem4Mosab Kaseem5Corrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of KoreaCorrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of KoreaDepartment of Biomaterials, Faculty of Interdisciplinary Sciences and Technologies, Tarbiat Modares University, Tehran, IranDepartment of Materials Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran; Corresponding author at: Corrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea.Owlstone Medical, Cambridge, United Kingdom; Corresponding author at: Corrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea.Corrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea; Corresponding author at: Corrosion and Electrochemistry Laboratory, Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea.This study explores the development of an organic-inorganic hybrid coating to enhance the corrosion resistance and photocatalytic properties of AZ31 Mg alloy modified by plasma electrolytic oxidation (PEO). The PEO process typically generates a porous oxide layer, which can reduce corrosion protection by allowing corrosive agents to penetrate the substrate. To address this limitation, phenopyridine (PHEN) and 2-methylimidazole (2-IMD) were incorporated into the PEO surface to form a robust organic layer on the Mg alloy. Potassium hydroxide (KOH) was used to adjust the pH, improving the interaction and solubility between the organic molecules and the PEO coating. The hybrid coating exhibited unique twig-like surface structures that contributed to forming a multifunctional coating with high corrosion resistance and superior photocatalytic activity. The PEO-PHEN-2IMD sample on the Mg alloy demonstrated exceptional corrosion resistance, with the lowest corrosion current density (Icorr) of 1.92 × 10-10 A/cm², a high corrosion potential (Ecorr), and the highest top layer resistance (Rtop) of 2.57 × 106 Ω·cm², indicating excellent barrier properties. Additionally, the coating achieved complete (100%) degradation of methylene blue (MB) within 30 min under visible light. Density Functional Theory (DFT) calculations provide deeper insights into the bonding mechanisms and interaction stability between PHEN, 2-IMD, and the PEO layer on the Mg alloy and MB dye. These findings confirmed the enhanced performance of the hybrid coating in both corrosion resistance and photocatalytic applications.http://www.sciencedirect.com/science/article/pii/S2213956724003815Mg alloyHybrid coatingPhenopyridine-2methylimidazole complexCorrosionPhotocatalytic activity |
| spellingShingle | Talitha Tara Thanaa Mohammad Aadil Alireza Askari Arash Fattah-alhosseini Mohammad Alkaseem Mosab Kaseem Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration Journal of Magnesium and Alloys Mg alloy Hybrid coating Phenopyridine-2methylimidazole complex Corrosion Photocatalytic activity |
| title | Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration |
| title_full | Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration |
| title_fullStr | Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration |
| title_full_unstemmed | Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration |
| title_short | Highly corrosion-resistant and photocatalytic hybrid coating on AZ31 Mg alloy via plasma electrolytic oxidation with organic-inorganic integration |
| title_sort | highly corrosion resistant and photocatalytic hybrid coating on az31 mg alloy via plasma electrolytic oxidation with organic inorganic integration |
| topic | Mg alloy Hybrid coating Phenopyridine-2methylimidazole complex Corrosion Photocatalytic activity |
| url | http://www.sciencedirect.com/science/article/pii/S2213956724003815 |
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