磷酸锌含量对环氧树脂-硅氧烷涂层性能的影响

摘要

Sodium phosphate, zinc sulfate, γ-aminopropyltriethoxysilane (KH-550) and epoxy resin (E51) were used as main raw materials to synthesize zinc phosphate by precipitation method.The epoxy resin-siloxane coatings containing different concentrations of zinc phosphate were prepared.The prepared coatings were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction.The corrosion resistance of the coatings was evaluated by electrochemical impedance spectroscopy (EIS).The results show that epoxy resin was grafted by KH-550 successfully.The zinc phosphate powder was irregular in structure and mainly composed of Zn3 (PO4) 2·4H2O.When the amount of zinc phosphate added into the coating was controlled around 2.5％ (mass fraction), the coating had high impedance and good corrosion resistance.%以磷酸钠、硫酸锌、γ-氨丙基三乙氧基硅烷(KH-550)和环氧树脂(E51)为主要原料,采用沉淀法合成磷酸锌,制备了不同磷酸锌含量的环氧树脂-硅氧烷涂层.采用傅里叶变换红外光谱、扫描电镜和X射线衍射等测试技术对所制备涂层进行了表征;通过电化学阻抗谱评价了涂层的耐蚀性.结果表明:KH-550成功接枝到环氧树脂上,磷酸锌粉末呈片状结构,主要成分为Zn3(PO4)2·4H2O;当加入的磷酸锌控制在2.5％(质量分数)左右时,环氧树脂-硅氧烷涂层的阻抗高,耐蚀性好.