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首页> 外文期刊>International Journal of Electrochemical Science >Anticorrosion Properties of Waterborne Polyurethane Coating Containing Caffeate Anions Intercalated LDH
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Anticorrosion Properties of Waterborne Polyurethane Coating Containing Caffeate Anions Intercalated LDH

机译：水性聚氨酯涂料的防腐性能含有咖啡因阴离子插入LDH

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摘要

LDH with caffeate anions intercalation was successfully prepared by acidification of LDH and followed ionic exchange process. Waterborne polyurethane based coatings withouth and with 0.5 wt% LDH and 0.5 wt% caffeate anions intercalated LDH (LCA) were fabricated with the thickness of 70 ± 4 μm. EIS and LEIS were used to characterize the electrochemical and micro-area corrosive behavior of LDHdoped coatings. It displayed that the addition of LDH loaded with caffeate anions improved the impedance of PU from 1.47×107 to 3.93×107 Ω cm2 after 30 days immerion in 3.5% NaCl solution. In addition, the micro-area corrosive condition of LCA containing PU is better than that in pure PU and LDH containing PU coating, which could ascribe to the emancipation of intercalated caffeate ions in LDH. The addition of LCA nanohybrids into PU could enhance the barrier performances of PU. Moreover, the excellent ions exchanges ability of LDH could be used to adsorb chloride ions, and the release of caffeate anions could delay the process of corrosion reactions. The synergistic effect of caffeate anions and LDH improves the anti-corrosion performance of waterborne PU.
机译：通过LDH的酸化成功制备含有咖啡因阴离子嵌入的LDH并洗脱离子交换过程。使用0.5wt％LDH和0.5wt％LDH和0.5wt％咖啡因阴离症的水性聚氨酯基涂层嵌入式LDH（LCA），厚度为70±4μm。 EIS和艾兹用于表征LDHDOPED涂层的电化学和微区域腐蚀行为。它显示加载咖啡因阴离子的LDH的加入从1.47×107到3.93×107Ωcm2改善了PU的阻抗在3.5％NaCl溶液中浸泡后30.3×107Ωcm2。此外，LCA的微区域腐蚀性条件PU比纯PU和LDH含有PU涂层的微面积腐蚀条件，这可能递成LDH中插入含有咖啡因离子的解放。将LCA纳米油脂添加到PU中可以增强PU的阻挡性能。此外，LDH的优异离子交换能力可用于吸附氯离子，咖啡因阴离子的释放可以延迟腐蚀反应的过程。咖啡因阴离子和LDH的协同作用提高了水性PU的防腐蚀性。

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