表面改性水滑石的制备及其耐腐蚀性能研究

通过水热合成法制备一种硝酸根插层的Zn-Al水滑石，利用静电作用在水滑石表面沉积聚天冬氨酸，以其作为交联剂与缓蚀剂三价铈离子络合，完成对水滑石表面的改性；将改性后的Zn-Al水滑石分散在双组分水性环氧涂层中。扫描电子显微镜 (SEM) 和X射线衍射 (XRD) 的表面形貌和晶体结构分析、ζ电势测试以及EIS阻抗谱测试结果表明，表面改性后的水滑石应用于环氧涂层中能够起到明显的自修复效果，并能提高涂层的耐腐蚀性能。

Preparation and Anti-corrosion Property of Surface Modified Hydrotalcite

A kind of nitrate-intercalated Zn-Al hydrotalcite was prepared by hydrothermal synthesis method. Then which was modified via a two-step process, namely polyaspartic acid as cross-linking agent was firstly deposited by electrostatic interaction, and then corrosion inhibitor trivalent cerium ions were further complexed on the surface of hydrotalcite. The modified Zn-Al hydrotalcite was characterized by means of scanning electron microscope (SEM) and X-ray diffraction (XRD) and zeta potential test. Meanwhile the modified Zn-Al hydrotalcite was dispersed in a two-component waterborne epoxy coating. The anti-corrosion performance of the prepared coating was assessed by EIS impedance spectrum test, and results show that the surface-modified hydrotalcite can play a significant role in rehealing performance of the epoxy coating, therewith the corrosion resistance of the coating can be enhanced.