【作者】 陈立庄；

【导师】 高延敏；

【作者基本信息】 江苏科技大学 ， 材料学， 2006， 硕士

【摘要】 以往防腐涂料主要依赖无机缓蚀剂提高防腐性能,对其防腐机理也做了比较深入的研究,但对有机缓蚀剂在涂层中的应用涉猎的还不多,为此本论文从有机缓蚀剂入手,探讨了有机缓蚀剂在环氧涂层中的作用机理。 采用电化学方法和差示扫描量热法(DSC)研究了1,4-丁炔二醇缓蚀剂在环氧涂料中缓蚀作用。结果表明:缓蚀剂的加入可以明显改变涂层的阻抗,当缓蚀剂加入量小于0.5%时,涂层的阻抗随着缓蚀剂量的增多而增大:通过Zsimpwin软件对所测得的缓蚀涂层的交流阻抗数据进行拟合,认为在基底和涂层之间生成了一层不完整的聚合物覆盖膜,在此基础上采用极化曲线技术探讨了此覆盖膜在涂层中的缓蚀机理。 利用电化学阻抗谱和表面分析技术,研究了不同缓蚀剂包覆滑石粉对环氧涂层耐蚀性的影响。通过计算求出了硬脂酸不同包覆浓度时,水在涂层中的扩散系数。结果表明,经硬脂酸包覆的滑石粉填料在环氧树脂涂层中,具有降低水扩散系数的作用。在环氧树脂涂层中,硬脂酸包覆的滑石粉填料存在一个最佳包覆浓度,当包覆量小于最佳包覆浓度时,水在涂层中的扩散系数随着包覆量的增大而减小,当大于最佳包覆浓度时,硬脂酸将影响涂层对基材的附着力而失去防腐的作用。用通透杯测定了不同温度下水汽在含硬脂酸包覆滑石粉环氧涂层中的渗水率,通过计算求出了水汽在涂层中传输的表观活化能。结果表明,温度升高,使水汽在涂层中渗水率加快,但对涂层的饱和吸水量影响不大;水汽在硬脂酸包覆填料涂层的中传输的表观活化能明显高于水在空白涂层中传输的表观活化能。更多还原

【Abstract】 Corrosion inhibition of 1, 4- butynediol in epoxy coatings was studied by means of electrochemical method and DSC. Experimental results showed that the inhibitor obviously increase the corrosion-resistance of epoxy coatings. When the amount of 1, 4- butynediol corrosion inhibitor is less than 0.5 % in the coating, the impedance of coating increases with addition of the corrosion inhibitor. Through the impedance data that is fitted by Zsimpwin software, we suggest that the incomplete corrosion inhibitor film with double bonds is formed between coating and substrate. The inhibitor mechanism of the corrosion inhibitor film was also discussed by means of electrochemical method.By means of electrochemical impedance spectroscopy (EIS) and surface analysis technology, the impedance variation of epoxy coatings with talcum powder filler coated by various organic corrosion was studied .The diffusion coefficients of water through epoxy coatings with talcum powder filler coated by different concentration stearic acid was calculated .The experimental results show that the stearic acid -coated talcum powder filler in the epoxy coatings has the function of decreasing water diffusion coefficients , and modifying filler by coating is likely to be a method to make the filler with anti-corrosion function . Furthermore, the filler coated by stearic acid have a optimum coating concentration, when less than the concentration, diffusion coefficients decrease with coating concentration increase, while more than the concentration, the filler influences adhesion between the coating and substrate, as a result, stearic acid can cause the failure of corrosion protection. The permeability of water vapor through epoxy coatings with talcum powder coated by stearic acid was measured by permeation cup, the permeation apparent activation energy was calculated .The experiment results show the water vapor permeability increased with increasing temperature however, water saturated absorption changed very little. The permeation apparent activation energy of water vapor through epoxy coating with stearic acid is obviously higher than that through epoxy coating without stearic acid.更多还原