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

• Published in: Polymers Vol. 11; no. 5; p. 850
• Main Authors: Lei, Yanhua, Qiu, Zhichao, Liu, Jiurong, Li, Dongdong, Tan, Ning, Liu, Tao, Zhang, Yuliang, Chang, Xueting, Gu, Yanhong, Yin, Yansheng
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 10.05.2019; MDPI
• Subjects: Barriers; Cathodic coating (process); Cathodic protection; conducting polymer; corrosion; Corrosion effects; Corrosion potential; Corrosion prevention; Corrosion tests; Dielectric properties; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrodes; Electrolytes; Epoxy resins; Graphene; LEIS; Measuring instruments; Nanosheets; PANI; Polyanilines; Primers (coatings); Protective coatings; Scanning electron microscopy; Spectrum analysis; Zinc; Zinc coatings; United States > US; China; Japan; LEIS; conducting polymer; PANI; corrosion; graphene
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym11050850

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.