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Electrodeposition of bilayered polypyrrole on 316 L stainless steel for corrosion prevention
Affiliation:1. School of Chemistry, University of Leeds, LS2 9JT Leeds, UK;2. The Valspar Corporation, Witney, Oxon OX8 6XR, UK;3. The Food and Environment Research Agency, Sand Hutton, York YO41 1LZ, UK;1. Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;2. Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;3. Center of Excellence in Sensors and Green Chemistry, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran;1. Grupo de Investigación en Materiales Poliméricos (GIMAPOL), Departamento de Química, Universidad Francisco de Paula Santander, Avenida Gran Colombia No. 12E-96 Barrio Colsag, San José de Cúcuta, Colombia;2. Grupo Ciencia de los Materiales, Universidad de Antioquia, Calle 62 52-59 Medellín, Antioquia, Colombia;1. Department of Printing Technology, Mechanics and Printing Institute, Faculty of Production Engineering, Warsaw University of Technology, Konwiktorska 2, 00-217 Warsaw, Poland;2. Faculty of Chemistry, Department of Polymer Chemistry and Technology, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;1. Corning Incorporated, Corning, NY, United States;2. ProUnlimited, NY, United States;3. North Dakota State University, Fargo, ND, United States;1. Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e Materiais (PPGE3M), Escola de Engenharia (EE), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500 Bairro Agronomia, Porto Alegre, RS, Brazil;2. Departament d’Enginyeria Química, E. T. S. d’Enginyeria Industrial de Barcelona, Universitat Politèecnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain;3. Center for Research in Nano-Engineering, Universitat Politèecnica de Catalunya, Campus Sud, Edifici C’, C/Pasqual i Vila s/n, Barcelona E-08028, Spain
Abstract:The electropolymerization of pyrrole in aqueous solutions of salicylate leads to the formation of hollow rectangular-sectioned microtubes. With the aim to develop a coating with this morphology but with better anticorrosive properties we synthesized a bilayer system by depositing a polypyrrole underlayer electropolymerized in the presence of molybdate and nitrate and a polypyrrole film formed by the microtubes as a top layer. The corrosion performance of the coatings was monitored by following the open circuit potentials, polarization curves and electrochemical impedance spectroscopy in acid and neutral chloride solutions. The bilayers have the capacity to protect the steel against uniform as well as against pitting corrosion during long exposure times. The system with the inner layer formed in alkaline solution was the most protective coating in this study. The results are discussed in terms of the galvanic interaction between the polymer and the substrate and the role played by the dopant anions.
Keywords:Polymers  Coatings  Electrochemical techniques  Corrosion
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