Abstract

The protection properties of (3-aminopropyl)trimethoxysilane (APTMS) incorporated epoxy coating on aluminum alloy were studied by electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) analysis in seawater. The epoxy-APTMS coated Al alloy displayed higher charge transfer resistance (R_ct) as well as film resistance (R_f) at 1 day immersion. However, both R_ct anf R_f values decreased slowly compared to pure epoxy coated alloy which showed significant decrease in R_ct and R_f values with increase in immersion time in chloride media. The released Al³⁺ ions were detected using SECM by applying the tip potential of –0.85 V. It was evident from the SECM measurement that the dissolution of Al³⁺ ions was impeded at the scratch of epoxy-APTMS coated Al alloy due to the presence of electron donating amino group in APTMS which inhibited Al alloy degradation. The enrichment of Mg, Mn, Si and Al at the scratch of epoxy-APTMS coated Al alloy was confirmed by Field emission-scanning electron microscopy/energy dispersive X-Ray spectroscopy (FE-SEM/EDX) analysis. Focused ion beam-transmission electron microscopy (FIB-TEM) analysis proved the presence of thin films of nano level oxide layers containing Mg, Mn, Si and Al in the coatings, which decreased the corrosion rate of Al alloy. The enhanced adherence of epoxy-APTMS coating to Al alloy was due to the strong chemical bonding between epoxy-APTMS and Al alloy. Therefore, the pronounced protection performance against corrosion and good adhesion strength was due to the incorporation of APTMS with epoxy coatings.

中文翻译：

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AA6082铝合金环氧硅烷杂化纳米复合涂层的耐蚀性能评价。

摘要

通过电化学技术，如电化学阻抗谱（EIS）和扫描电化学显微镜（SECM）分析，研究了在铝合金上掺入（3-氨基丙基）三甲氧基硅烷（APTMS）的环氧涂层对铝合金的防护性能。浸有环氧树脂的APTMS涂层铝合金在浸泡1天后显示出更高的电荷转移电阻（R _ct）和膜电阻（R _f）。然而，这两种ř_克拉ANF ř _˚F值慢慢降低相比纯环氧树脂涂覆的合金这表明在降低显著ř _CT和- [R _˚F值随着在氯化物介质中浸入时间的增加而增加。使用SECM通过施加–0.85 V的尖端电位来检测释放的Al ³⁺离子。从SECM测量中可以明显看出，Al ³⁺的溶解由于在APTMS中存在供电子氨基基团，从而抑制了铝合金的降解，因此离子在环氧-APTMS涂层铝合金的划痕处受到阻碍。通过场发射扫描电子显微镜/能量色散X射线光谱（FE-SEM / EDX）分析确认了环氧-APTMS涂层铝合金在划痕处Mg，Mn，Si和Al的富集。聚焦离子束透射电子显微镜（FIB-TEM）分析证明涂层中存在包含Mg，Mn，Si和Al的纳米级氧化物层薄膜，这降低了铝合金的腐蚀速率。环氧-APTMS涂层对铝合金的附着力增强是由于环氧-APTMS与铝合金之间的牢固化学键合。因此，