Purpose

The purpose of this paper is to enhance the compatibility of titanium dioxide in epoxy resins and thus the corrosion resistance of the coatings.

Design/methodology/approach

In this work, TiO₂ was modified by the mechanochemistry method where mechanical energy was combined with thermal energy to complete the modification. The stability of modified TiO₂ in epoxy was analyzed by sedimentation experiment. The modified TiO₂-epoxy coating was prepared, and the corrosion resistance of the coating was analyzed by open circuit potential, electrochemical impedance spectroscopy and neutral salt spray test.

Findings

High-temperature mechanical modification can improve the compatibility of TiO₂ in epoxy resin. At the same time, the modified TiO₂-epoxy coating showed better corrosion resistance. Compared to the unmodified TiO₂-epoxy coating, the coating improved the dry adhesion force by 61.7% and the adhesion drop by 33.3%. After 2,300 h of immersion in 3.5 Wt.% NaCl solution, the coating resistance of the modified TiO₂ coating was enhanced by nearly two orders of magnitude compared to the unmodified coating.

Originality/value

The authors have grafted epoxy molecules onto TiO₂ surfaces using a high-temperature mechanical force modification method. The compatibility of TiO₂ with epoxy resin is enhanced, resulting in improved adhesion of the coating to the substrate and corrosion resistance of the coating.

中文翻译：

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高温力化学法改性TiO2对TiO2-环氧涂层分散性和耐腐蚀性的影响

目的

本文的目的是提高二氧化钛在环氧树脂中的相容性，从而提高涂层的耐腐蚀性。

设计/方法论/途径

本工作采用机械能与热能相结合的机械化学方法对TiO ₂进行改性。通过沉降实验分析了改性TiO ₂在环氧树脂中的稳定性。制备了改性TiO ₂ -环氧涂层，并通过开路电位、电化学阻抗谱和中性盐雾试验分析了涂层的耐腐蚀性能。

发现

高温机械改性可以提高TiO ₂在环氧树脂中的相容性。同时，改性后的TiO ₂ -环氧树脂涂层表现出更好的耐腐蚀性能。与未改性的TiO ₂环氧涂料相比，该涂料的干附着力提高了61.7%，附着力下降了33.3%。_{在3.5 Wt.% NaCl溶液中浸泡2,300小时后，与未改性涂层相比，改性TiO 2}涂层的涂层电阻提高了近两个数量级。

原创性/价值

作者使用高温机械力改性方法将环氧树脂分子接枝到 TiO _{2表面。TiO 2}与环氧树脂的相容性增强，从而提高了涂层与基材的附着力和涂层的耐腐蚀性。