Abstract:

Composite particles of cerium oxdie/nickel tungstate (CeO₂/NiWO₄) with different mass ratios were prepared by hydrothermal method, and the composite particles were modified by silane coupling agent KH560. The structure，morphology and properties of the composite materials were characterized by SEM, FTIR and XRD. The modified composite particles were dispersed in epoxy resin (EP), and the CeO₂/NiWO₄/EP composite coating was prepared on the carbon steel substrate by spraying method. The anti-corrosion and wear resistance studies were tested by electrochemical impendence spectroscopy (EIS), accelerated soaking test and friction-wear test. The results showed that the anti-corrosion effect of CeO₂/NiWO₄ composite coating was improved greatly. The composite coating exhibited the best anti-corrosion and wear-resisting properties when the mass ratio of CeO₂/NiWO₄ was 4∶3．The composite coating maintained a high impedance modulus (7.36 × 10⁸ Ω/cm²) immersed in 3.5% NaCl anqeous solution in the late immersion period (45 days), which was an order of magnitude higher than that of a pure epoxy coating. Meanwhile, After 10000 cycles’ rubbing, the friction mass loss of this composit coating was reduced by 56% compared with the EP and the thickness loss was only 50% of CeO₂/EP, showing the best corrosion resistance and wear resistance.

Key words: hydrothermal, composites, cerium oxide, nickel tungstate, corrosion, wear resistance

摘要：

采用水热法制备出不同质量比的氧化铈/钨酸镍(CeO₂/NiWO₄)的复合粒子，再选用硅烷偶联剂KH560对其进行改性，利用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）表征了复合粒子的结构与形貌。将改性的复合粒子分散于环氧树脂（EP）中，然后喷涂在碳钢基体上制备CeO₂/NiWO₄/EP复合涂层，利用电化学交流阻抗（EIS）、加速浸泡实验和摩擦磨损试验（Taber）测试涂层的防腐与摩擦性能。结果表明：添加CeO₂/NiWO₄复合粒子的环氧树脂涂层的防腐耐磨性能大幅度提高，而且当复合粒子中CeO₂与NiWO₄的质量比为4∶3时，涂层防腐耐磨性能最好，该复合环氧涂层在3.5%NaCl水溶液中浸泡后期(45天)仍保持较高的阻抗模量(7.36×10⁸ Ω/cm²)，比纯环氧树脂涂层高一个数量级。同时，经过10000转摩擦磨损后，此复合涂层的质量损失较纯环氧涂层减少56%，厚度损失量仅为CeO₂/EP的50%，表现出最优异的防腐耐磨性能。

关键词: 水热, 复合材料, 氧化铈, 钨酸镍, 腐蚀, 耐磨