ZnAl layered double hydroxide (ZnAl-LDH) film loaded with nitrates was prepared on the surface of pure Al plate by hydrothermal reaction. The anion-exchange process of ZnAl-LDH in corrosive NaCl solution was demonstrated by the X-ray Diffraction (XRD). The corrosion protection behavior of this fabricated film was monitored by performing electrochemical impedance spectroscopy (EIS) up to 39 d. It was revealed that the physical barrier effect of nitrate-intercalated ZnAl-LDH film played a significant role in its corrosion protection and the anion-exchange had a limited influence on final corrosion protection.

中文翻译：

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在铝上生长的硝酸盐插层 ZnAl 层状双氢氧化物膜的物理屏障和阴离子交换过程对腐蚀防护的影响

通过水热反应在纯铝板表面制备了负载硝酸盐的ZnAl层状双氢氧化物（ZnAl-LDH）薄膜。X射线衍射（XRD）证明了ZnAl-LDH在腐蚀性NaCl溶液中的阴离子交换过程。通过执行长达 39 天的电化学阻抗谱 (EIS) 来监测这种制造的薄膜的腐蚀保护行为。结果表明，硝酸盐插层ZnAl-LDH薄膜的物理阻隔作用对其腐蚀保护起到了重要作用，而阴离子交换对最终腐蚀保护的影响有限。