Journal
PROGRESS IN ORGANIC COATINGS
Volume 122, Issue -, Pages 159-169Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2018.05.022
Keywords
Polypyrrole; Electropolymerization; Corrosion protection; Physical properties; Mechanism
Funding
- National Science & Technology Pillar Program during the Twelfth Five-year Plan Period for Seawater Desalination Technology [2015BAB08B00]
- Natural Science Foundation for Young Scholars of Jiangsu Province, China [BK20160983]
- National Key RD Plan [2017YFC0404100]
- National Natural Science Foundation of China [21605084]
- Jiangsu Province Natural Science Foundation for Young Scholars of China [BK20160983, BK20170111]
- Special basic research service for the Central Level Public Welfare Research Institute [GYZX170302]
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Polypyrrole (PPY) and polypyrrole-molybdate (PPY-MoO42-) coatings have been successfully electro-polymerized on carbon steel by cyclic voltammetry method in aqueous oxalic acid solutions. These coatings were characterized by FTIR, XPS, EDX, FESEM and AFM methods. It was found that the incorporation of MoO42- enhanced the corrosion resistance of PPY coating and improved the physical properties, such as thermostability, wettability, adhesion and hardness. The corrosion protection performance of PPY and PPY-MoO42- coated steel in 0.1 M HCl solution was investigated by electrochemical impedance spectroscopy and Tafel polarization. Moreover, molecular dynamic simulations were engaged to assess the interactions between the metal surface and complex coatings. The exceptional anti-corrosion performance of PPY-MoO42- coating was associated with the complex passive film on the metal surface and the barrier effect of the coating.
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