添加纳米锌粉环痒涂层腐蚀电化学行为

用电化学阻抗谱(EIS)技术研究了添加不同质量 百分比浓度的纳米锌粉环氧涂层的腐蚀电化学行为，并与环氧清漆(不含颜料)涂层的腐蚀电化学行为进行对比.结果表明，添加不同质量百分比浓度纳米锌粉环氧涂层与环氧清漆涂层具有不同的电化学阻抗谱特征.纳米锌粉的添加量对涂层的防护性能有显著影响，添加不同质量百分比浓度纳米锌粉环氧涂层防腐蚀性能的优劣顺序为：环氧清漆涂层>20mass%>10mass%>2mass%纳米锌环氧涂层.添加纳米锌粉对环氧涂层的防护性能有2方面的影响：一方面使涂层中的微观缺陷大大增多，涂层的防护性能降低；另一方面，由于锌粉的腐蚀产物可将涂层中部分缺陷堵塞，从而对涂层的防护性能有提高作用.由于在所研究的质量百分比浓度范围内(2mass%～20mass%)，前者起了主导作用，所以综合作用的结果是使涂层的防护性能变差.  s.

Electrochemical Behavior of Epoxy Coatings with Nano-sized Pigment

The electrochemical behavior of epoxy coatings with different amount of nano-sized zinc pigment has been studied by EIS. The experimental results showed that, nano - sized zinc pigment had remarkably negative effect on the protective performance of coatings. In comprarison with the epoxy resin coating, the corrosion resistance of epoxy resin coatings incorparated with nano-sized zinc pigment was deteriorated. The more the amount of nano-sized zinc added, the worse the corrosion resistance was within a range of 2-20mass% of nano - sized zinc addition. There were two functions of nano - zinc pigment to the epoxy coating. On the one hand, the pigment increased the amount of micro defects in the coatings, which led to the deterioration of the protective property of the coatings, and on the other hand, the corrosion products of zinc filled in the defects in the coatings, which resulted in the improvement of the corrosion performance of the coatings. Within the range of 2 - 20mass% of nano -zinc addition, the former function played more important role than the latter one, resulting in the worse corrosion resistance of the coatings.