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纳米二氧化硅/微弧氧化复合涂层6061铝合金的局部电化学腐蚀

Local Electrochemical Corrosion of 6061 Aluminum Alloy with Nano-SiO/MAO Composite Coating.

作者信息

Zhao Jie, Zhang Hongwei, Yang Xiaoyu, Gu Yanhong, Liu Yida

机构信息

School of Safety Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.

School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.

出版信息

Materials (Basel). 2023 Oct 17;16(20):6721. doi: 10.3390/ma16206721.

DOI:10.3390/ma16206721
PMID:37895703
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10608637/
Abstract

To improve the corrosion resistance of 6061 Al in electric vehicle battery packs, a composite coating of nano-SiO/Micro-Arc oxidation (MAO) ceramic structure was prepared on its surface. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves (PDP) were used to evaluate the corrosion resistance of the specimens after 7 days immersion in a 3.5% NaCl solution. The corrosion resistance of the prefabricated coatings was measured via local electrochemical impedance spectroscopy (LEIS). Confocal microscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to characterize the microstructure and phase composition of the specimens. An energy dispersive spectrometer (EDS) was used to detect the elemental composition of the surface of the specimen. The results showed that the specimen with nano-SiO/MAO composite coating had the least amount of micropores and superior corrosion resistance. The global electrochemical impedance of nano-SiO/MAO composite coating was 1.1 times higher than that of the MAO coating and 8.4 times higher than that of the 6061 Al. When the coating was defective, the local electrochemical impedance of the nano-SiO/MAO composite coating was still two times higher than that of the MAO coating. In the presence of scratches, the nano-SiO/MAO composite coating still showed high corrosion resistance. The collapse corrosion mechanism of the nano-SiO/MAO composite coating was proposed.

摘要

为提高6061铝合金在电动汽车电池组中的耐腐蚀性，在其表面制备了纳米SiO/微弧氧化（MAO）陶瓷结构复合涂层。采用电化学阻抗谱（EIS）和动电位极化曲线（PDP）对试样在3.5% NaCl溶液中浸泡7天后的耐腐蚀性进行评估。通过局部电化学阻抗谱（LEIS）测量预制涂层的耐腐蚀性。利用共聚焦显微镜、扫描电子显微镜（SEM）和X射线衍射（XRD）对试样的微观结构和相组成进行表征。使用能谱仪（EDS）检测试样表面的元素组成。结果表明，具有纳米SiO/MAO复合涂层的试样微孔数量最少，耐腐蚀性优异。纳米SiO/MAO复合涂层的整体电化学阻抗比MAO涂层高1.1倍，比6061铝合金高8.4倍。当涂层存在缺陷时，纳米SiO/MAO复合涂层的局部电化学阻抗仍比MAO涂层高两倍。在有划痕的情况下，纳米SiO/MAO复合涂层仍表现出高耐腐蚀性。提出了纳米SiO/MAO复合涂层的崩溃腐蚀机理。

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