赵方超,刘伟,钱建才,许斌,钟勇,蒲亚博,方敏,郭赞洪.薄型铝涂层的制备及其对TC4/LC52接触腐蚀的防护作用[J].表面技术,2025,54(10):151-163.
ZHAO Fangchao,LIU Wei,QIAN Jiancai,XU Bin,ZHONG Yong,PU Yabo,FANG Min,GUO Zanhong.Preparation of Thin Aluminum Coating and Its Protective Effect on TC4/LC52 Contact Corrosion[J].Surface Technology,2025,54(10):151-163 |
| 薄型铝涂层的制备及其对TC4/LC52接触腐蚀的防护作用 |
| Preparation of Thin Aluminum Coating and Its Protective Effect on TC4/LC52 Contact Corrosion |
| 投稿时间：2024-08-24 修订日期：2025-03-21 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.10.012 |
| 中文关键词: 接触腐蚀 钛合金 铝合金 硬质阳极氧化 铝涂层 |
| 英文关键词:contact corrosion titanium alloy aluminum alloy hard anodizing aluminum coating |
| 基金项目: |
| 作者 | 单位 |
| 赵方超 | 中国兵器装备集团西南技术工程研究所，重庆 400039;装备环境效应与防护重庆市重点实验室，重庆 400039 |
| 刘伟 | 中国兵器装备集团西南技术工程研究所，重庆 400039;装备环境效应与防护重庆市重点实验室，重庆 400039 |
| 钱建才 | 中国兵器装备集团西南技术工程研究所，重庆 400039;装备环境效应与防护重庆市重点实验室，重庆 400039 |
| 许斌 | 中国兵器装备集团西南技术工程研究所，重庆 400039 |
| 钟勇 | 中国兵器装备集团西南技术工程研究所，重庆 400039 |
| 蒲亚博 | 中国兵器装备集团西南技术工程研究所，重庆 400039;装备环境效应与防护重庆市重点实验室，重庆 400039 |
| 方敏 | 中国兵器装备集团西南技术工程研究所，重庆 400039 |
| 郭赞洪 | 中国兵器装备集团西南技术工程研究所，重庆 400039 |
|
| Author | Institution |
| ZHAO Fangchao | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing 400039, China |
| LIU Wei | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing 400039, China |
| QIAN Jiancai | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing 400039, China |
| XU Bin | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China |
| ZHONG Yong | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China |
| PU Yabo | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China;Chongqing Key Laboratory of Environmental Effects and Protection, Chongqing 400039, China |
| FANG Min | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China |
| GUO Zanhong | Southwest Technology and Engineering Research Institute of China South Industries Group Corporation, Chongqing 400039, China |
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| 中文摘要: |
| 目的 评估薄型(厚度小于15 μm)铝涂层对Ti/Al异种金属连接构件的腐蚀防护效能，并研究其协同防护机理，支撑高性能薄型铝涂层设计制备，推动其在电偶腐蚀、缝隙腐蚀等严酷环境下的应用。方法 通过颜填料优化设计及喷涂工艺改进等方法，制备了膜厚均匀、一致性良好的薄型长效耐蚀铝涂层，并分别涂装于钛合金TC4、铝合金LC52试板，组装成TC4/LC52连接试验件;采用中性盐雾试验方法对连接试验件进行加速试验考核，对比不同工艺组合连接件的腐蚀情况;采用SEM法分析试验前后试验件的微观形貌变化情况，采用电化学交流阻抗法对涂层耐蚀性能进行分析。结果 未处理TC4/LC52硬质阳极氧化连接结构中，铝合金接触面腐蚀最严重，出现了大量的白色腐蚀产物及涂层脱落现象;将铝涂层涂覆于TC4钛合金表面，相比于未涂装铝涂层，构件电偶电流下降1个数量级，有效抑制了钛合金电位太正而产生的电偶腐蚀，但依然存在小范围涂层脱落现象;将铝涂层涂覆于LC52硬质阳极氧化表面，能有效抑制接触面硬质阳极氧化涂层脱落，白色腐蚀产物面积由原来的50%下降到5%;将铝涂层同时涂覆于连接结构的2个接触面，即形成TC4+铝涂层/LC52硬质阳极氧化+铝涂层，无腐蚀产物生成，接触面铝涂层仅出现变色。SEM分析表明，所涂覆的铝涂层表面仅发生点状腐蚀，铝微粒与环境介质形成氧化物及铝盐;交流阻抗分析表明，硬质阳极氧化的LC52在涂装铝涂层后低频阻抗模值比涂装前高出3个数量级，展示出良好的介质屏蔽性。结论 通过合理设计铝涂层功能填料含量及涂装工艺制备的高性能铝涂层，基于铝粉的电化学活性、片状结构的迷宫效应、氧化后的增强致密阻隔等三重协同作用，对连接构件具有优异的防护效能，在满足装配精度的同时能显著改善钛/铝接触腐蚀。 |
| 英文摘要: |
| The work aims to assess the corrosion protection effectiveness of thin (less than 15 μm) Al coatings on Ti/Al dissimilar metal connection components and explore their synergistic protection mechanisms, so as to support the design and preparation of high-performance thin Al coatings, and promote their applications in harsh environments such as galvanic corrosion and crevice corrosion. A thin Al coating with uniform film thickness and long-term corrosion resistance was prepared by optimizing the design of pigments and fillers and improving the spraying process. The results showed that after a 928 h of 5% neutral salt spray test, bubbles covered a small area of the surface of the (4-6 μm) Al coating, and no obvious bubbling, rusting, discoloration were found on the surface of the (12-15 μm) Al coating. To study the effects of different protective coatings on the contact corrosion behavior of TC4 Ti alloy and LC52 Al alloy, different TC4/LC52 connection test pieces were assembled by applying the different protective coatings on TC4 and LC52 test plates with M8 bolts. Two kinds of TC4 samples were prepared, one with no surface treatment and the other with Al coating (12-15 μm). Two types of LC52 samples were also prepared, one with hard anodizing (30-35 μm) + boiling water sealing, and the other with hard anodizing (12-15 μm) + Al coating (12-15 μm). The corrosion situations of different combinations of connection samples were assessed and compared by the neutral salt spray test. The microstructure changes of the samples before and after the test were analyzed with SEM, and the corrosion resistance of the coatings was characterized with electrochemical impedance spectroscopy (EIS). The results showed that for the untreated TC4/LC52 hard anodized connection components, the contact surface of Al alloy suffered the most severe corrosion, with a large amount of white corrosion products and coating peeling off. After the TC4 alloy was coated with Al, the galvanic current of the component decreased by an order of magnitude compared to that of the uncoated component, effectively suppressing the galvanic corrosion induced by the positive potential of the TC4 alloy, whereas small-scale coating peeling off could still be observed. By applying the Al coating on the hard anodized surface of LC52, peeling of the anodized coating from the contact surface was effectively suppressed, with the white corrosion products decreased from 50% to 5%. By applying Al coating to both contact surfaces of the connecting components (TC4+Al coating/LC52 hard anodized+Al coating), no corrosion product was observed, and only discoloration occurred on the Al coating. The SEM analysis showed that only pitting corrosion occurred on the surface of the Al coating, and oxides and Al salts were formed. The EIS analysis indicated that the low-frequency impedance modulus of anodized and Al-coated LC52 was 3 orders of magnitude higher than that of the uncoated component, demonstrating its good dielectric shielding performance. Lastly, Ti alloy did not exhibit corrosion in all connection structures, and the hard anodizing treatment of the Al alloy had little effect on the corrosion protection of the Ti plate and the Al alloy, probably because the hard anodizing film of Al alloy was not dense enough to effectively prevent galvanic corrosion of the Ti/Al connection structure. The Al coating can effectively improve Ti/Al contact corrosion resistance while meeting the assembly accuracy, based on the synergistic effects of Al powder electrochemical activity, the maze effect of sheet-like structure, and the enhanced dense barrier after oxidation. |
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