Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 117, Issue -, Pages 171-181Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2020.11.027
Keywords
Conductive polymer coatings; Copolymerization; Ionic liquids; Electrosynthesis; Corrosion protection
Categories
Funding
- National Science & Technology Pillar Program during the Twelfth Five-year Plan Period for Seawater Desalination Technology [2015BAB08B00]
- National Key RD Plan [2017YFC0404100]
- Jiangsu Province Natural Science Foundation for Young Scholars of China [BK20160983]
- National Natural Science Foundation of China [21605084]
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P(ANI-co-PY) and P(ANI-co-PY)-MoO42 copolymer coatings with different molar ratios of aniline (ANI) and pyrrole (PY) monomers are electrosynthesized on the surface of a 304 stainless steel (304SS) in 1-butylsulfonic acid-3-methylimidazolium hydrogensulfate (BAMH) ionic liquid solution using cyclic voltammetry (CV) technique. P(ANI-co-PY) and P(ANI-co-PY)-MoO42 copolymer coatings possess better surface compactness and thermostability than the pure PANI and PPY coatings. H-1 NMR studies and UV-vis tests confirm the successful copolymerization of the P(ANI-co-PY) polymer. The corrosion behaviors of the bare 304SS and PANI, PPY, P(ANI-co-PY), and P(ANI-co-PY)-MoO42 coated 304SS are evaluated in a 0.1 M HCl solution via electrochemical methods. The charge transfer resistance (Rct) is obtained by performing equivalent circuit fitting, and it is shown that the Rct of P(50ANI-co-50PY)-MoO42 copolymer coating is 10 times larger than that of the pure PANI and PPY coatings after being immersed in 0.1 M HCl for 240 h. A maximum corrosion protection efficiency of 99.3% is attained for P(50ANI-co-50PY)-MoO42 copolymer coating, which indicates its superior corrosion protection ability. The excellent anti-corrosion performance can be attributed to (1) the physical barrier of the copolymer coatings, (2) anodic protection of the conductive polymers, and (3) the effective adsorption of BAMH onto the surface of 304SS. (c) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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