Effect of Conducting Polyaniline/Graphene Nanosheet Content on the Corrosion Behavior of Zinc-Rich Epoxy Primers in 3.5% NaCl Solution

Yanhua Lei; Zhichao Qiu; Jiurong Liu; Dongdong Li; Ning Tan; Tao Liu; Yuliang Zhang; Xueting Chang; Yanhong Gu; Yansheng Yin

doi:10.3390/polym11050850

Effect of Conducting Polyaniline/Graphene Nanosheet Content on the Corrosion Behavior of Zinc-Rich Epoxy Primers in 3.5% NaCl Solution

Polymers (Basel). 2019 May 10;11(5):850. doi: 10.3390/polym11050850.

Authors

Yanhua Lei^{1

2}, Zhichao Qiu³, Jiurong Liu⁴, Dongdong Li⁵, Ning Tan⁶, Tao Liu⁷, Yuliang Zhang⁸, Xueting Chang⁹, Yanhong Gu¹⁰, Yansheng Yin¹¹

Affiliations

¹ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. yhlei@shmtu.edu.cn.
² Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing Institute of Petrochemical Technology, Beijing 102617, China. yhlei@shmtu.edu.cn.
³ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. qzc4321@163.com.
⁴ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. liujingrong@126.com.
⁵ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. 201730410071@stu.shmtu.edu.cn.
⁶ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. tanning986@163.com.
⁷ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. liutao@shmtu.edu.cn.
⁸ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. ylzhang@shmtu.edu.cn.
⁹ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. xtchang@shmtu.edu.cn.
¹⁰ Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil & Gas Development, Beijing Institute of Petrochemical Technology, Beijing 102617, China. guyanhong@bipt.edu.cn.
¹¹ Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. ysyin@shmtu.edu.cn.

Abstract

The corrosion behavior of zinc-rich epoxy primers or paints (ZRPs) with different conducting polyaniline-grafted graphene (PANI/Gr) contents was investigated. Conductivity of the formed PANI/Gr nanosheets was significantly improved by employing the Gr as the inner template to synthesize the PANI. The protective properties and electrochemical behavior of coatings with artificial defects were investigated by monitoring the free corrosion potential versus time and by using localized electrochemical impedance spectroscopy (LEIS). A synergetic enhancement of the physical barrier role of the coating and the zinc sacrificial cathodic protection was achieved in the case of ZRP including PANI/Gr nanosheets. In addition, the ZRP mixed with the PANI/Gr at a content of 0.6% exhibited the best anticorrosion performance across the range of investigated PANI/Gr contents.

Keywords: LEIS; PANI; conducting polymer; corrosion; graphene.