Abstract
The synthesis of polyaniline- montmorrilonite (MMT) nanocomposite coatings on 316L stainless steel (316L SS) surface has been investigated by using the galvanostatic method. The synthesized coatings were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), UV-visible absorption spectrometry and Scanning Electron Microscopy (SEM). The anticorrosion performances of polyaniline-MMT nanocomposite coatings were investigated in 0.5 M HCl medium by the potentiodynamic polarization technique and Electrochemical Impedance Spectroscopy (EIS). The corrosion rate of polyaniline-MMT nanocomposite coated 316L SS was found ∼540 times lower than bare 316L SS and potential corrosion increased from −0.386 V versus Ag/AgCl for uncoated 316L SS to −0.040 V versus Ag/AgCl for polyaniline-MMT nanocomposite coated 316L SS electrodes. Electrochemical measurements indicate that polyaniline-MMT nanocomposite coated have good inhibiting properties with mean efficiency of ~99.8 % at 0.75 mA cm−2 current density applied on 316L SS corrosion in acid media. The results of this study clearly ascertain that the polyaniline-MMT nanocomposite has an outstanding potential to protect 316L SS against corrosion in an acidic environment.
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The authors are grateful to University of Kashan for supporting this work by Grant No (159194/7).
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Shabani-Nooshabadi, M., Ghoreishi, S.M., Jafari, Y. et al. Electrodeposition of polyaniline-montmorrilonite nanocomposite coatings on 316L stainless steel for corrosion prevention. J Polym Res 21, 416 (2014). https://doi.org/10.1007/s10965-014-0416-5
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DOI: https://doi.org/10.1007/s10965-014-0416-5