PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003
Within the realm of corrosion protection methods for Al alloys, sol-gel technique has garnered increasing attention. However, conventional sol-gel methodologies cannot provide adequate long-lasting corrosion protection to Al alloys when exposed to chloride-rich solutions. This paper introduces an in...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Corrosion Communications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667266924000562 |
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| author | Zhiyuan Feng Jiao Li Keqi Huang Guoqiang Liu Huanhuan Bai Xin Huang Jun Qi Zhengwei Tang Penghai Xu Xiaofei Yang Zheng Qu Guozhe Meng |
| author_facet | Zhiyuan Feng Jiao Li Keqi Huang Guoqiang Liu Huanhuan Bai Xin Huang Jun Qi Zhengwei Tang Penghai Xu Xiaofei Yang Zheng Qu Guozhe Meng |
| author_sort | Zhiyuan Feng |
| collection | DOAJ |
| description | Within the realm of corrosion protection methods for Al alloys, sol-gel technique has garnered increasing attention. However, conventional sol-gel methodologies cannot provide adequate long-lasting corrosion protection to Al alloys when exposed to chloride-rich solutions. This paper introduces an innovative approach to substantially augment the corrosion resistance of aluminum alloys through utilization of polydopamine (PDA)-modified sol-gel films. Effort was made to fabricate a PDA-modified sol-gel coating and a systematic investigation was conducted thereof. Long-term corrosion performance of this coating in 3.5 wt.% NaCl solution was evaluated through electrochemical impedance spectroscopy (EIS). Results show that the low-frequency impedance of the PDA-modified sol-gel coating remains significantly high at 7.9 × 105 Ω·cm2, even after 36 d of immersion in 3.5 wt.% NaCl medium, indicative of excellent protective properties. It notably surpasses low-frequency impedance of the unmodified coating, which registers at 2.5 × 104 Ω·cm2. The incorporation of PDA into the sol-gel coating, facilitated by adsorption and diffusion mechanisms, serves to fill micrometer- and nanometer-scale defects of the coating, thereby markedly enhancing their compactness. Furthermore, despite its modest thickness of 9 μm, the PDA-modified coating exhibits enduring corrosion protection capabilities. |
| format | Article |
| id | doaj-art-c5cccb1570824b758d960cde636a9c31 |
| institution | Kabale University |
| issn | 2667-2669 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Corrosion Communications |
| spelling | doaj-art-c5cccb1570824b758d960cde636a9c312025-08-20T03:42:44ZengElsevierCorrosion Communications2667-26692025-03-0117576510.1016/j.corcom.2023.11.006PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003Zhiyuan Feng0Jiao Li1Keqi Huang2Guoqiang Liu3Huanhuan Bai4Xin Huang5Jun Qi6Zhengwei Tang7Penghai Xu8Xiaofei Yang9Zheng Qu10Guozhe Meng11School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China; Corresponding Authors.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaKey Laboratory of Harbor & Marine Structure Durability Technology, Ministry of Transport, CCCC Fourth Harbor Engineering Institute Co., Ltd, Guangzhou 510230, ChinaDepartment of Chemical and Materials Engineering, University of Kentucky, Lexington KY 40506, USA; Corresponding Authors.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaPetroChina Tarim Oilfield Company, Korla 841000, ChinaPetroChina Tarim Oilfield Company, Korla 841000, ChinaPetroChina Tarim Oilfield Company, Korla 841000, ChinaCollege of Grain Science and Technology, Shenyang Normal University, Shenyang 110034, ChinaTesla Gigafactory Shanghai, Tesla, Shanghai 200131, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China; Corresponding Authors.Within the realm of corrosion protection methods for Al alloys, sol-gel technique has garnered increasing attention. However, conventional sol-gel methodologies cannot provide adequate long-lasting corrosion protection to Al alloys when exposed to chloride-rich solutions. This paper introduces an innovative approach to substantially augment the corrosion resistance of aluminum alloys through utilization of polydopamine (PDA)-modified sol-gel films. Effort was made to fabricate a PDA-modified sol-gel coating and a systematic investigation was conducted thereof. Long-term corrosion performance of this coating in 3.5 wt.% NaCl solution was evaluated through electrochemical impedance spectroscopy (EIS). Results show that the low-frequency impedance of the PDA-modified sol-gel coating remains significantly high at 7.9 × 105 Ω·cm2, even after 36 d of immersion in 3.5 wt.% NaCl medium, indicative of excellent protective properties. It notably surpasses low-frequency impedance of the unmodified coating, which registers at 2.5 × 104 Ω·cm2. The incorporation of PDA into the sol-gel coating, facilitated by adsorption and diffusion mechanisms, serves to fill micrometer- and nanometer-scale defects of the coating, thereby markedly enhancing their compactness. Furthermore, despite its modest thickness of 9 μm, the PDA-modified coating exhibits enduring corrosion protection capabilities.http://www.sciencedirect.com/science/article/pii/S2667266924000562DopamineSol-gelAl alloysCorrosionEIS |
| spellingShingle | Zhiyuan Feng Jiao Li Keqi Huang Guoqiang Liu Huanhuan Bai Xin Huang Jun Qi Zhengwei Tang Penghai Xu Xiaofei Yang Zheng Qu Guozhe Meng PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 Corrosion Communications Dopamine Sol-gel Al alloys Corrosion EIS |
| title | PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 |
| title_full | PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 |
| title_fullStr | PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 |
| title_full_unstemmed | PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 |
| title_short | PDA-modified sol-gel coating for long-lasting corrosion protection on Al alloy 3003 |
| title_sort | pda modified sol gel coating for long lasting corrosion protection on al alloy 3003 |
| topic | Dopamine Sol-gel Al alloys Corrosion EIS |
| url | http://www.sciencedirect.com/science/article/pii/S2667266924000562 |
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