Synthesis and characterization of modified iron oxide hydrophobic corrosion-resistant pigment for aluminum alloy coating

IF 2 3区材料科学 Q2 ENGINEERING, MECHANICAL

Surface Topography: Metrology and Properties Pub Date : 2024-04-25 DOI:10.1088/2051-672x/ad3fd0

Bingkui Wang, Renhuan Luo, Zhanhua Yang, Xiaoyu Zhou, Wang Li, Jiacheng Li, Qiankun Wei, Jun Chen, Guowang Wei, Jiubing Zhang, Zhongmin Wang and Weijiang Gan

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引用次数: 0

Abstract

A hydrophobic coating containing modified iron oxides was prepared for corrosion protection of aluminum alloy. The modified iron oxide particles were synthesized using the annealing method and the evaluation of the corrosion-resistant benefits of modified iron oxides as additive in the epoxy resin coating was conducted. The raw FeOOH phase can be transformed into the α-Fe2O3 phase by increasing the annealing temperature. The morphology, colors, and pore size of the modified iron oxide are controllably evolved via finely adjusting the annealing temperature, which is beneficial for the compatibility, dispersion, and stability with epoxy resin. Besides, modified α-Fe2O3 annealed at 700 °C exhibited elliptical morphology and good solubility in epoxy resin solvents to form a hydrophobic corrosion inhibition layer (TP700), which further improves the corrosion resistance. Findings of corrosion electrochemical measurements and salt spray test confirmed the existence of TP700 composite coating resulted in the best corrosion protective properties on aluminum alloy during the corrosion process with the minimum corrosion current of 7.75 × 10−10 A cm−2 and the maximum |Z|0.01Hz value of 1.80 × 108 Ω cm2, which both are about two orders of magnitude higher than the commercial Fe2O3. Our results suggest a new venue for preparing modified iron oxide pigment on the surface of aluminum alloy materials for enhanced anti-corrosion applications.

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用于铝合金涂层的改性氧化铁疏水性耐腐蚀颜料的合成与表征

制备了一种含有改性氧化铁的疏水涂层，用于铝合金的防腐蚀保护。采用退火法合成了改性氧化铁颗粒，并对改性氧化铁作为环氧树脂涂层添加剂的耐腐蚀性能进行了评估。通过提高退火温度，原始的 FeOOH 相可以转变为 α-Fe2O3 相。通过微调退火温度，可控制改性氧化铁的形貌、颜色和孔径，这有利于改性氧化铁与环氧树脂的相容性、分散性和稳定性。此外，在 700 °C 下退火的改性α-Fe2O3 呈现出椭圆形态，在环氧树脂溶剂中具有良好的溶解性，形成疏水性缓蚀层（TP700），进一步提高了耐腐蚀性能。腐蚀电化学测量和盐雾试验结果证实，TP700 复合涂层在腐蚀过程中对铝合金的腐蚀保护性能最佳，最小腐蚀电流为 7.75 × 10-10 A cm-2，最大 |Z|0.01Hz 值为 1.80 × 108 Ω cm2，均比商用 Fe2O3 高出约两个数量级。我们的研究结果为在铝合金材料表面制备改性氧化铁颜料以增强防腐应用提供了新的途径。

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来源期刊

Surface Topography: Metrology and Properties Materials Science-Materials Chemistry

CiteScore

4.10

自引率

22.20%

发文量

183

期刊介绍： An international forum for academics, industrialists and engineers to publish the latest research in surface topography measurement and characterisation, instrumentation development and the properties of surfaces.