Evaluation of corrosion resistance of polypyrrole/functionalized multi-walled carbon nanotubes composite coatings on 60Cu–40Zn brass alloy |
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| Affiliation: | 1. Materials and Metallurgical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran;2. Hakim Sabzevari University, Materials and Polymer Engineering Department, Sabzevar, P.O. Box 391, Iran;1. Department of Chemistry, Alzahra University, Tehran, Iran;2. Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran;1. School of Metallurgy and Materials Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran;2. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran;3. Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan 81746-73441, Iran;1. Department of Applied Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, 65174, Iran;2. Department of Materials Engineering, Faculty of Engineering, University of Gonabad, Gonabad, Iran |
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| Abstract: | Polypyrrole/multi-walled carbon nanotubes (PPy/MWCNT) and its carboxylic functionalized (PPy/MWCNT-COO−) composite films were successfully electropolymerized by cyclic voltammetry as protective coating against corrosion on 60Cu–40Zn brass alloy surface. It yielded to strongly adherent and smooth nanocomposite films. Kinetics of the corrosion protection was investigated in 3.5 wt% NaCl solutions by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests. The results showed that the presence of MWCNT in PPy coat considerably reduces the corrosion rate of 60Cu–40Zn brass alloy. The enhanced inhibition is most likely due to interaction between MWCNT and PPy. This in turn, improves the alloy passivation improvement and alters the permselectivity of the coating from anionic selectivity to the cationic selectivity. Moreover, PPy/MWCNT-COO− functionalized nanocomposite provided higher corrosion resistance coating than PPy/MWCNT alone. |
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| Keywords: | Functionalized carbon nanotube EIS Polypyrrole coating Smart coating Brass 60Cu–40Zn alloy |
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