镀锌板表面纳米复合钝化膜的研究

发布时间：2018-06-02 19:35

本文选题：镀锌板 + 无铬钝化　；参考：《安徽工业大学》2017年硕士论文

【摘要】：本论文以阳离子有机硅改性环氧树脂为成膜物质,通过添加不同种类和不同含量的纳米粒子和缓蚀剂,利用溶液共混的方法制得无铬复合钝化液。以马钢产热镀锌板为成膜基材,制备复合钝化膜,通过塔菲尔极化曲线、电化学交流阻抗谱、中性盐雾加速腐蚀试验等方法研究钝化膜的防腐性能。用阳离子稳定剂水溶液合成阳离子改性聚吡咯水分散液,考察稳定剂用量以及吡咯单体用量对聚吡咯水分散液合成的影响。结果表明:稳定剂与吡咯的质量比为10:1,吡咯含量为0.2%时,能获得稳定的纳米级聚吡咯水分散液。纳米粒度仪测试结果表明其平均粒径为141.8nm。以阳离子有机硅改性环氧树脂和γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)为主要成膜物质,改变加入的单宁酸和聚吡咯水分散液的量,进行正交实验。正交试验结果表明复合钝化液的最优配方为:阳离子有机硅改性环氧树脂含量12.75%、KH560含量3.0%、PPy含量为0.01%、单宁酸为0.4%。对硅酸镁锂进行阳离子化改性,以阳离子有机硅改性环氧树脂为主要成膜物质,制备改性硅酸镁锂/有机硅改性环氧树脂复合钝化膜。通过改变改性硅酸镁锂在溶液中的含量,利用电化学测试复合钝化膜的防腐性能。结果表明:硅酸镁锂/有机硅改性环氧树脂复合钝化液中,硅酸镁锂占成膜物质的1%时,复合涂层的防腐效果最佳,此时自腐蚀电流密度1.785×10-6(A·cm-2)、腐蚀电位值为-1.052V。固定硅酸镁锂占成膜物质的1%,通过加入不同种类的缓蚀剂,测试缓蚀剂对复合钝化液的影响。电化学结果表明:加入不同种类的缓蚀剂对钝化膜的性能有影响,当缓蚀剂含量分别为:钼酸钠含量为0.073%,钒酸钠含量为0.18%,氟钛酸铵含量为0.108%,单宁酸含量为0.6%,复合涂层的防腐蚀性能最佳;植酸的加入降低了复合涂层的耐蚀性能。以阳离子有机硅改性丙烯酸乳液为成膜物质,通过改变石墨烯的含量制备不同含量的石墨烯/阳离子有机硅改性丙烯酸乳液复合涂层。电化学测试结果表明:石墨烯的加入对涂层具有一定的影响。随着石墨烯含量的增加,涂层的防腐性能逐渐增加,当石墨烯含量为0.15%时,涂层的防腐性能最佳。
[Abstract]:In this paper, cationic organosilicon modified epoxy resin was used as film forming material, chromium-free composite passivation solution was prepared by adding different kinds of nano-particles and corrosion inhibitors. The composite passivation film was prepared from hot-dip galvanized plate of Masteel. The anticorrosion performance of the passivation film was studied by means of Taffer polarization curve electrochemical impedance spectroscopy and neutral salt spray accelerated corrosion test. Cationic modified polypyrrole aqueous dispersion was synthesized from aqueous solution of cationic stabilizer. The effects of the amount of stabilizer and the amount of pyrrole monomer on the synthesis of polypyrrole aqueous dispersion were investigated. The results show that when the mass ratio of stabilizer and pyrrole is 10: 1 and the content of pyrrole is 0.2, a stable water dispersion of polypyrrole can be obtained. The average particle size is 141.8 nm. Cationic silicone modified epoxy resin and 纬 -glycidyl ether oxy propyl trimethoxysilane (KH 560) were used as main film-forming materials, and the amount of water dispersions of tannic acid and polypyrrole was changed, and orthogonal experiments were carried out. The results of orthogonal test showed that the optimum formula of the compound passivation solution was as follows: the content of cationic silicone modified epoxy resin was 12.75 and the content of KH560 was 3.0% and the content of PPy was 0.01.The content of tannic acid was 0.4wt%. The modified magnesium lithium silicate / silicone modified epoxy resin composite passivation film was prepared by cationic silicone modified epoxy resin as the main film forming material. By changing the content of modified lithium magnesium silicate in solution, the anticorrosion performance of the composite passivated film was measured by electrochemical method. The results show that when lithium magnesium silicate / silicone modified epoxy resin composite passivating solution, the composite coating has the best anticorrosive effect when lithium magnesium silicate occupies 1% of the film-forming material, and the corrosion potential is -1.052 V with a self-corrosive current density of 1.785 脳 10 ~ (-6) Acm ~ (-2). The effect of the inhibitor on the compound passivation solution was tested by adding different kinds of corrosion inhibitor. The electrochemical results showed that the performance of the passivation film was affected by the addition of different kinds of corrosion inhibitor. The corrosion resistance of the composite coating was decreased by the addition of phytic acid when the corrosion inhibitor content was 0.073 3 sodium molybdate 0.18% sodium vanadate 0.108 ammonium fluorotitanate 0.108 and 0.6% tannic acid respectively. The composite coating of graphene / cationic silicone modified acrylic emulsion was prepared by changing the content of graphene with cationic silicone modified acrylic emulsion as film forming material. The electrochemical test results show that the addition of graphene has a certain effect on the coating. With the increase of graphene content, the anticorrosive property of the coating increases gradually. When the content of graphene is 0.15, the anticorrosive property of the coating is the best.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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