Electrochemical preparation of poly 3-amino-5-hydroxypyrazole on copper and its corrosion protection efficiency
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Electrochemical preparation of poly 3-amino-5-hydroxypyrazole on copper and its corrosion protection efficiency Nazila Khorrammaslack, Khalil Farhadi, Seyed Masoud Seyedahmadian, Biuck Habibi
Ó American Coatings Association 2020 Abstract Electrochemical synthesis of poly 3-amino5-hydroxypyrazole (PAHP) on copper electrode surface was carried out by cyclic voltammetry technique in 0.03 M 3-amino-5-hydroxypyrazole solution containing 0.3 M oxalic acid. The formation of dark brown PAHP on copper surface was characterized by cyclic voltammetry, FTIR and scanning electron microscopy techniques. The corrosion characteristics of copper/PAHP electrode were evaluated by electrochemical methods and electrochemical impedance spectroscopy in 3.5% NaCl solution. The obtained results indicated that PAHP thin film coating was an excellent inhibitor and controlled copper corrosion against corrosive agents in 3.5% NaCl solution. Keywords Poly 3-amino-5-hydroxypyrazole, Electropolymerization, Copper, Corrosion, Electrochemical impedance spectroscopy
Introduction The ability of polymer coatings to protect metal surfaces has made them popular, and in recent years, much attention has been focused on the synthesis of stable and compact polymers as efficient corrosion Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11998-020-00345-0) contains supplementary material, which is available to authorized users. N. Khorrammaslack, S. M. Seyedahmadian, B. Habibi Department of Chemistry, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran K. Farhadi (&) Department of Analytical Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran e-mail: [email protected]@urmia.ac.ir
inhibitors on various metals, such as iron and aluminum and their alloys.1 However, despite the use of copper in a wide range of technological applications, only a few studies have been conducted on the control of copper corrosion using conductive polymer coatings.2–7 The protection of copper using organic compounds, such as propargyl alcohol, aminotriazole, benzotriazole and several Schiff bases, is well known and has been widely reported.8–13 The main problem of these inhibitors, which are suitable in a variety of environments, is their toxicity; therefore, the development of novel and environmentally friendly corrosion inhibitors is urgent. Consequently, the majority of recent studies have concentrated on formulating new and more environmentally acceptable polymeric coatings. A literature survey showed that various polymers synthesized through chemical or electrochemical procedures have been used as effective coatings toward corrosion control of copper in various media.14–17 Polypyrrole coating on copper decreased the corrosion rate of metal in neutral sodium chloride solution with high protection performance.14 Similar protection behavior has been observed for poly (2-aminophenol) coatings against copper corrosion in solutions containing high concentrations of ions.15 Polyaniline (at va
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