聚苯胺修饰纳米ZnO薄膜及其光致阴极保护性能

Photogenerated cathodic protection of polyaniline modified nano-ZnO films

从金属材料腐蚀特性及腐蚀保护要求出发,首先利用阳极氧化法制得Zn O薄膜,再通过恒电位法将Zn O薄膜用聚苯胺修饰得到Zn O/PANI复合薄膜。采用扫描电镜分析(SEM)、X射线衍射分析(XRD)、光电流、开路电位(OCP)及电化学阻抗等方法对制得的Zn O薄膜和Zn O/PANI复合薄膜进行物性分析和光电性能评价。研究表明:成功制得Zn O/PANI复合薄膜,且表现出优良的腐蚀保护性能。OCP实验表明,Zn O/PANI复合薄膜腐蚀保护性能与纳米Zn O薄膜相比提升了2~3倍。其中,光照后Zn O薄膜的光电流增加7μA,OCP下降5m V,复合薄膜的光电流增加22μA,OCP下降13m V。最后,失重实验对两种薄膜的光致阴极保护性能的分析数据显示,Zn O薄膜和Zn O/PANI复合薄膜都能对316L不锈钢和Q235碳钢起到光致阴极保护效果,但复合薄膜对316L不锈钢的保护效果尤为明显,其受腐蚀速率与在Zn O薄膜保护状态下相比降低了1倍以上。

According to the corrosion characteristics and the corrosion protection requirements of metal materials, Zn O thin films were prepared by anodic oxidation method and then the Zn O films were modified by polyaniline by constant potential method. The properties of Zn O thin films and Zn O/PANI composite films were characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, photocurrent, open-circuit potential（OCP） and electrochemical impedance spectroscopy（EIS）. The results show that the Zn O/PANI composite films have been successfully prepared with excellent corrosion protection performance. The photocurrent and open-circuit potential（OCP） experiments show that the corrosion protection performance of the Zn O/PANI composite film is 2~3 times higher than that of the nano-Zn O thin films. The photocurrent of the Zn O thin film increases by 7μA, and the OCP decreases by 5 m V, while the photocurrent of the composite film increases by 22μA, and the OCP decreases by 13 m V. Finally, the analysis of the photo-cathodic protection performance of the two films shows that the Zn O thin films and the Zn O/PANI composite films both have photo-cathodic protection effect on 316 L stainless steel and Q235 carbon steel. When we used the composite film to protect 316 L stainless steel, the corrosion rate is less than half of that of the Zn O film.