节点文献
稀土改性环氧片锌涂料耐硫酸盐还原菌性能研究
Anti-corrosion Property of Flake Zinc Epoxy Coating Doped with Rare Earth in SRB
【作者】 刘勇；
【导师】 傅宇东；
【作者基本信息】 哈尔滨工程大学 ， 材料学， 2011， 硕士
【摘要】 本课题以片状锌粉为主要填料,以E-44环氧树脂和651聚酰胺固化剂为成膜物质,制备了环氧富锌涂料,并添加氯化稀土对涂料进行改性。利用抗硫酸盐还原菌实验、电化学阻抗谱、扫描电镜、X射线衍射、能谱、划格法等测试了不同稀土元素和不同锌粉涂料的抗菌性能、防腐性能、组织形态和机械性能。结果显示,氯化镧、氯化镱对硫酸盐还原菌具有很好的抗菌作用,抗菌效果随稀土浓度增大而增强,氯化镱抗菌效果最好；氧化镧、氧化镱对硫酸盐还原菌无抗菌作用；片状锌粉含量在25%(涂料固含量为67%,不挥发分金属锌含量为37%)时,涂料机械性能、防腐性能最好；环氧片锌涂料与市购环氧富锌涂料相比性能更好,但二者抗硫酸盐还原菌能力不佳；添加氯化镧、氯化镱改性后的环氧片锌涂料具有更好的防腐性能和抗硫酸盐还原菌能力,添加氯化镱的涂料性能最好。分析表明,稀土离子对硫酸盐还原菌具有抗菌作用；分布于涂层表面的稀土离子能有效抑制硫酸盐还原菌的生长繁殖；稀土离子与硫酸盐还原菌代谢产物反应生成硫化物沉淀,提高了涂层的屏蔽作用,同时降低了锌粉的消耗。改性后的环氧片锌涂料可以作为车间底漆和防锈漆使用,也可作为抗硫酸盐还原菌防腐涂料单独使用。
【Abstract】 The zinc-rich epoxy coating with flake zinc as the main filler, E-44 epoxy and 651 polyamide curing agent as film former was prepared and modified by doping with rare earth chloride. Anti-bacterial properties, anti-corrosion properties, microstructure and mechanical properties of different zinc coatings and rare earth elements were tested by anti-SRB, EIS, SEM, XRD, EDS, scribe test, respectively.The results showed that lanthanum chloride and ytterbium chloride presented good anti-bacterial properties to SRB, and ytterbium chloride was better. Anti-SRB effect increased with concentration of rare earth increasing, but lanthanum oxide and ytterbium oxide showed no effect on SRB. The mechanical properties and anti-corrosion properties were best when the content of flake zinc was 25%(solid content was 67%, non-volatile zinc content was 37%), and flake zinc epoxy coating was better than commercial zinc-rich epoxy coating, but the anti-SRB properties for two kinds of coatings were weak. The anti-corrosion properties and anti-SRB properties of flake zinc epoxy coating doped with lanthanum chloride or ytterbium chloride were better than the coating without rare earth, especially ytterbium chloride coating.The analysis showed that SRB can be killed by the rare earth ions in solution. The growth and reproduction of SRB were effectively inhibited by rare earth ions which distributed on the surface of coating. Sulfide precipitation was obtained by the reaction between rare earth ions and metabolites of SRB, which can enhance the shielding effect of the coating and reduce the consumption rate of zinc. Flake zinc epoxy coating modified by rare earth can be used not only as primer or antirust coating, but also as anti-SRB coating alone.