Protective Performance of Polyaniline-Sulfosalicylic Acid/Epoxy Coating for 5083 Aluminum

Suyun Liu; Li Liu; Fandi Meng; Ying Li; Fuhui Wang

doi:10.3390/ma11020292

Protective Performance of Polyaniline-Sulfosalicylic Acid/Epoxy Coating for 5083 Aluminum

Materials (Basel). 2018 Feb 13;11(2):292. doi: 10.3390/ma11020292.

Authors

Suyun Liu^{1

2}, Li Liu^{3

4}, Fandi Meng^{5

6}, Ying Li⁷, Fuhui Wang^{8

9}

Affiliations

¹ Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. syliu13s@imr.ac.cn.
² School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230000, China. syliu13s@imr.ac.cn.
³ Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. liliu@imr.ac.cn.
⁴ Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China. liliu@imr.ac.cn.
⁵ Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. fdmeng@imr.ac.cn.
⁶ Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China. fdmeng@imr.ac.cn.
⁷ Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. liying@imr.ac.cn.
⁸ Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. fhwang@imr.ac.cn.
⁹ Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang 110819, China. fhwang@imr.ac.cn.

Abstract

Epoxy coatings incorporating different content of sulfosalicylic acid doped polyaniline (PANI-SSA) have been investigated for corrosion protection of 5083 aluminum alloy in 3.5% NaCl solution. The performance of the coatings is studied using a combination of electrochemical impedance spectroscopy (EIS), open circuit potential (OCP), gravimetric tests, adhesion tests, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results demonstrate that the content of PANI-SSA not only affects the coating compactness and the transportation of aggressive medium, but also has a significant influence on the-based aluminum. The coating with 2 wt. % PANI-SSA exhibits the best corrosion inhibition due to its good protective properties and the formation of a complete PANI-SSA induced oxide layer.

Keywords: EIS; aluminum; polyaniline; polymer coatings.