Abstract An epoxy coating loaded with inhibitor nanoreservoirs was elaborated for the smart corrosion protection of Zn-Mg coated steel (ZM). To achieve this, Mg-Al layered double hydroxides modified with benzotriazole (LDH-BTA) were synthesized using the coprecipitation method. LDH, without and with BTA, were characterized by using X-ray diffraction, scanning and transmission electron microscopy, Fourier transformed infrared spectroscopy and total organic carbon measurements. The effect of LDH-BTA on the corrosion inhibition of Zn-Mg coated steel in immersion in chloride solutions was studied by means of electrochemical techniques and surface analyses. The stability of a suspension made of epoxy resin loaded with 1.5 wt. % LDH-BTA was controlled by sedimentation measurements using Turbiscan, whereas the corrosion protection abilities of the composite coating were assessed by focusing on both barrier and self-healing properties. It was shown that the BTA molecules present on the LDH surface are released in the presence of chloride ions, thus interacting with the metallic surface and improving the corrosion resistance of ZM. The suspension composed of epoxy resin and LDH-BTA was proved to be stable due to the organic functionalization of LDH by the BTA organic inhibitor. The modification of LDH with BTA allows the reasonable barrier properties of the epoxy-based coating associated with a self-healing ability in immersion conditions to be maintained.

中文翻译：

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将苯并三唑改性的层状双氢氧化物掺入环氧树脂中以保护锌镁涂层钢

摘要 为锌镁涂层钢（ZM）的智能腐蚀保护设计了一种载有抑制剂纳米储层的环氧涂层。为此，使用共沉淀法合成了苯并三唑改性的 Mg-Al 层状双氢氧化物 (LDH-BTA)。通过使用 X 射线衍射、扫描和透射电子显微镜、傅里叶变换红外光谱和总有机碳测量对 LDH 进行了表征。通过电化学技术和表面分析研究了 LDH-BTA 对浸入氯化物溶液中的 Zn-Mg 涂层钢的腐蚀抑制作用。负载 1.5 重量％的环氧树脂制成的悬浮液的稳定性。% LDH-BTA 通过使用 Turbiscan 的沉降测量来控制，而复合涂层的防腐蚀能力则是通过关注阻隔和自修复性能来评估的。结果表明，存在于 LDH 表面的 BTA 分子在氯离子存在下被释放，从而与金属表面相互作用并提高 ZM 的耐腐蚀性。由于 BTA 有机抑制剂对 LDH 进行了有机官能化，证明由环氧树脂和 LDH-BTA 组成的悬浮液是稳定的。用 BTA 对 LDH 进行改性可以保持环氧基涂层的合理阻隔性能，并在浸泡条件下保持自愈能力。从而与金属表面相互作用并提高 ZM 的耐腐蚀性。由于 BTA 有机抑制剂对 LDH 进行了有机官能化，证明由环氧树脂和 LDH-BTA 组成的悬浮液是稳定的。用 BTA 对 LDH 进行改性可以保持环氧基涂层的合理阻隔性能，并在浸泡条件下保持自愈能力。从而与金属表面相互作用并提高 ZM 的耐腐蚀性。由于 BTA 有机抑制剂对 LDH 进行了有机官能化，证明由环氧树脂和 LDH-BTA 组成的悬浮液是稳定的。用 BTA 对 LDH 进行改性可以保持环氧基涂层的合理阻隔性能，并在浸泡条件下保持自愈能力。