目的 改善有机涂层和无机缓蚀剂相容性差的问题,实现缓蚀剂的可控释放,提高有机涂层的防护性能.方法 用共沉淀方法将缓蚀剂钼酸根离子插入镁铝水滑石中,并用硅烷偶联剂KH560对其表面接枝改性来提高填料在富锌涂层中的分散性.结果 XRD、FTIR光谱分析结果表明,水滑石的层间距离增大,钼酸根成功装载进水滑石层中,在水滑石表面成功接枝硅烷偶联剂KH560.结论 通过将该填料添加到环氧富锌漆中,发现涂层的附着力、柔韧性均没有发生明显的下降,表明填料在环氧富锌涂层中分散均匀,对涂层的力学性能影响较小.结合电化学阻抗谱技术对比研究添加填料与未添加填料的涂层浸泡在NaC1溶液中的腐蚀行为,表明了该填料的添加可以提高富锌漆的耐腐蚀性能.
The work aims to improve the poor compatibility between organic coating and inorganic corrosion inhibitor,and realize the controlled release of corrosion inhibitor with the aim of improving protective property of organic coating.Magnesium aluminum hydrotalcite loaded with molybdate was synthesized by co-precipitation method.And the as-prepared hydrotalcite was modified by silane coupling agent KH560 to improve dispersion of pigments.The XRD and FTIR spectral analysis showed that the interlayer distance of hydrotalcite has been magnified,indicating that the molybdate has been inserted into the layers of hydrotalcite successfully,and silane coupling agent KH560 has been grafted to surface of as-prepared hydrotalcite.As KH560 modified filler was incorporated into epoxy zinc-rich paint,the adhesion and flexibility of coating show no obvious degradation,indicating that the filler disperse uniformly in the coating,fillers had smaller effect on mechanical properties of the coating.Furthermore,from the electrochemical impedance spectroscopy (EIS) we can conclude that the corrosion resistance of zinc-rich paint can be enhanced by adding the filler by studying corrosion behaviors of coatings with filler and without filler in NaC1 solution.
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