纳米植酸锌缓蚀效果及其复合环氧涂层的防护性能

目的 考察NaCl溶液中植酸锌对Q235的缓蚀效果及其复合环氧涂层的防护性能。方法 以植酸钠和乙酸锌为原材料成功制备纳米植酸锌，并通过红外光谱仪（IR）、扫描电子显微镜（SEM）、电子能谱仪（EDS）、透射电子显微镜（TEM）及X射线衍射仪（XRD）对其结构及形貌进行表征。采用开路电位、极化曲线、X射线光电子能谱技术（XPS）及SEM等手段，研究了Q235在含植酸锌浸出物的Na Cl溶液中的腐蚀行为及腐蚀形貌。利用SEM、电化学阻抗谱（EIS）以及盐雾测试等方法，研究了纳米植酸锌在环氧涂层中的分散性及其对环氧涂层防腐蚀性能的影响。结果 SEM和TEM显示合成的植酸锌为球形颗粒，颗粒直径较为均匀，为20～40 nm。开路电位、极化曲线测试显示，纳米植酸锌浸出物可以抑制Q235在1%NaCl溶液中的腐蚀。XPS显示，Q235试样表面明显吸附植酸根成膜。纳米植酸锌在环氧树脂中的分散状态良好，无明显团聚现象。EIS和盐雾测试显示，纳米植酸锌可以增强环氧涂层的防护性能。结论 纳米植酸锌可以用作防锈颜料，且相比于磷酸锌防锈颜料，添加相同量的纳米植酸锌的涂层的防腐效果更佳，其可能和植酸锌的小尺寸、良...

Corrosion Inhibition of Zinc Phytate Nanoparticles and Protective Performance of the Composite Epoxy Coating

The work aims at studying the corrosion inhibition of zinc phytate on Q235 in NaCl solution and the protective performance of the composite epoxy coating. Zinc phytate nanoparticles were prepared from sodium phytate and zinc acetate. Their structure and morphology were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM), electron energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The corrosion behavior of Q235 in the solution containing zinc phytate extract was studied by open circuit potential and polarization curves. The surface corrosion morphology and composition after immersion were characterized by SEM and X-ray photoelectron spectroscopy (XPS). The dispersion state of zinc phytate nanoparticles in the epoxy coating and their effect on corrosion resistance were studied by SEM, electrochemical impedance spectroscopy (EIS), and neutral salt spray test. SEM and TEM showed that the synthesized zinc phytate nanoparticles were spherical particles with a uniform diameter of about 20-40 nm. The open circuit potential and polarization curves showed that the extract of zinc phytate nanoparticles could inhibit the corrosion of Q235 in 1wt.% NaCl solution. XPS showed that the Q235 sample adsorbed phytate and formed a film; SEM could observe that zinc phytate nanoparticles were well dispersed in epoxy resin without obvious agglomeration. EIS and salt spray tests showed that zinc phytate nanoparticles could enhance the protective performance of the epoxy coating. It can be concluded that zinc phytate nanoparticles can be used as an antirust pigment. Compared with zinc phosphate antirust pigment, the coating with the same amount of nano zinc phytate has a better anti-corrosion effect, which may be related to the small size, good dispersion, and excellent corrosion inhibition effect of zinc phytate.