颜填料配比对水性环氧树脂防腐涂料耐蚀性能的影响

Effects of the proportions of pigments and fillers on corrosion resistance of waterborne epoxy resin anticorrosive coating

采用正交试验,根据耐中性盐雾试验结果优化了双组分水性环氧树脂涂料中颜填料的添加量,获得较优配比为:m(铁红)∶m(滑石粉)∶m(硫酸钡)∶m(磷酸锌)∶m(硅灰石)∶m(云母粉)=7∶2∶2∶2.5∶2∶1。通过耐酸碱性、耐中性盐雾试验及动电位极化曲线、电化学阻抗谱测试,对比研究了优化配方与正交试验中耐蚀性最强的几组及清漆组所得涂膜的耐蚀性。结果表明,优化颜填料后的涂层在3.5%NaCl溶液中具有最正的腐蚀电位、最低的腐蚀电流密度及最大的涂层阻抗模值,耐酸、碱和中性盐雾腐蚀的时间分别长达150 h和68 d和3 360 h。

The dosages of pigments and fillers in a two-component anticorrosive waterborne epoxy resin coating was optimized by evaluating the neutral salt spray(NSS)test results based on an orthogonal array design.The optimal mass ratio of red iron oxide,talc powder,barium sulfate,zinc phosphate,wollastonite,and mica powder was determined as 7:2:2:2.5:2:1.The corrosion resistance of the coating obtained with the optimized formulation of pigments and fillers was compared with some reference groups with the best performance in orthogonal test and the epoxy varnish coating through the acid and alkali resistance test,NSS test,potentiodynamic polarization measurement,and electrochemical impedance spectroscopy.The results showed that the optimized coating had the most positive corrosion potential,the lowest corrosion current density,and the largest impedance in a 3.5%NaCl solution,and its failure time was up to 150 hours in acid resistance test,68 days in alkali resistance test,and 3 360 hours in NSS test.