纳米ZrO_(2)/Zn-Al-C涂层在模拟地热水中的防腐性能

Corrosion resistance of nano ZrO_(2)/Zn-Al-C coating in simulated geothermal water

为提升环氧涂层的防腐性能,采用γ-氨丙基三乙氧基硅烷(KH-550)改善纳米二氧化锆(ZrO_(2))颗粒的团聚,联合Zn-Al-C合金粉,制备改性纳米ZrO_(2)/Zn-Al-C环氧树脂复合涂层。利用X-射线衍射(XRD)、傅里叶红外光谱(FT-IR)和扫描电镜(SEM)表征纳米ZrO_(2)改性前后的结构变化。结合电化学交流阻抗谱(EIS)和极化曲线(Tafel)分析复合涂层在模拟地热水环境中的腐蚀行为。结果表明:纳米ZrO_(2)表面成功接枝KH-550;复合涂层在模拟地热水中全浸泡720 h,其表面腐蚀结垢产物数量较原片明显减少;自腐蚀电流密度为6.113×10-10(A·cm-2),电化学性能良好。经改性后的环氧复合涂层,有效利用了纳米材料及金属材料的优越性能,其硬度及耐蚀性均得到显著提升,为环氧涂层在地热水环境中长期使用提供借鉴。

In order to improve the anti-corrosion performance of epoxy coatings,modified nano-ZrO_(2)/Zn-Al-C epoxy resin composite coatings were prepared by usingγ-aminopropyltriethoxysilane(KH-550)to improve the agglomeration phenomenon of nano-ZrO_(2)particles in combination with Zn-Al-C alloy powder.X-ray diffraction(XRD),Fourier infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM)were used to characterize the structural changes of nano-ZrO_(2)before and after the modification.With electrochemical AC impedance spectroscopy(EIS)and polarization curves(Tafel),the corrosion behavior of the composite coatings in simulated geothermal water environment was analyzed.The results show that the nano-ZrO_(2)surface is successfully grafted with KH-550;the number of corrosion scaling products on the surface of the composite coating is significantly reduced compared with the original sheet after full immersion in simulated geothermal water for 720 h;the self-corrosion current density is 6.113×10-10(A·cm-2),and the electrochemical performance is good.The modified epoxy composite coating effectively utilizes the superior properties of nanomaterials and metallic materials,and its hardness and corrosion resistance are improved significantly,which provides a reference for the long-term use of epoxy coating in geothermal water environment.