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首页> 外文期刊>International Journal of Electrochemistry >Protection of Steel Rebar in Salt-Contaminated Cement Mortar Using Epoxy Nanocomposite Coatings
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Protection of Steel Rebar in Salt-Contaminated Cement Mortar Using Epoxy Nanocomposite Coatings

机译：环氧纳米复合涂料对盐污染水泥砂浆中钢筋的保护

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摘要

Epoxy reinforced with two kinds of nanoparticles dealing with nano-SiO2 and nano-Fe2O3 was coated on steel rebar embedded in a chloride contaminated cement mortar. NaCl was added to the fresh Portland cement paste (at 0.3% and 0.5% by weight of cement) to simulate the chloride contamination at the critical level. The effect of incorporating nanoparticles on the corrosion resistance of epoxy-coated steel rebar was investigated by linear potentiodynamic polarization and electrochemical impedance spectroscopy. For the 0.3 wt.% chloride mortars, the electrochemical monitoring of the coated steel rebars during immersion for 56 days in 0.1 M NaOH solutions suggested the beneficial role of nano-Fe2O3 particles in significantly improving the corrosion resistance of the epoxy-coated rebar. After 56 days of immersion, the nano-Fe2O3 reduced the corrosion current of epoxy-coated rebar by a factor of 7.9. When the chloride concentration in the cement mortar was 0.5 wt.%, the incorporation of nanoparticles into the epoxy matrix did not enhance the corrosion resistance of epoxy coating for the rebar. At this critical level, chloride ions initiated rebar corrosion through nanoparticles at the epoxy/rebar interface.
机译：用两种处理纳米SiO2和纳米Fe2O3的纳米粒子增强的环氧树脂被涂覆在埋入氯化物污染的水泥砂浆中的钢筋上。将NaCl添加到新鲜的波特兰水泥浆中（分别占水泥的0.3％和0.5％），以模拟临界水平的氯化物污染。通过线性电势极化和电化学阻抗谱研究了纳米粒子掺入对环氧涂层钢筋的耐蚀性的影响。对于0.3％（重量）的氯化物砂浆，在0.1 M NaOH溶液中浸泡56天后，对涂层钢筋的电化学监测表明，纳米Fe2O3颗粒在显着提高环氧涂层钢筋的耐蚀性方面具有有益作用。浸入56天后，纳米Fe2O3将环氧涂层钢筋的腐蚀电流降低了7.9倍。当水泥砂浆中的氯化物浓度为0.5％（重量）时，将纳米颗粒掺入环氧基质中不会增强钢筋环氧涂料的耐腐蚀性。在此临界水平，氯离子通过环氧树脂/钢筋界面处的纳米粒子引发钢筋腐蚀。

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