Synthesis of corrosion inhibitive poly(2,5-dimethylaniline) coatings on low carbon steel
- 173 Downloads
An attempt has been made towards the synthesis of strongly adherent poly(2,5-dimethylaniline) coatings on low carbon steel substrates, with an objective of examining the possibility of using this polymer for corrosion protection of steel in chloride environment. In this work, the poly(2,5-dimethylaniline) coatings were synthesized by electrochemical polymerization of 2,5-dimethylaniline using sodium salicylate as a supporting electrolyte. The characterization of these coatings was carried out by cyclic voltammetry, UV-visible absorption spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. The results of these characterizations indicate that the aqueous salicylate solution is a suitable medium for the electrochemical polymerization of 2,5-dimethylaniline to generate strongly adherent and smooth poly(2,5-dimethylaniline) coatings on low carbon steel substrates. The performance of poly(2,5-dimethylaniline) as protective coating against corrosion of low carbon steel in aqueous 3% NaCl was assessed by the open circuit potential and the potentiodynamic polarization measurements. The potentiodynamic polarization measurement reveals that the poly(2,5-dimethylaniline) coating increases the corrosion potential and reduces the corrosion rate of low carbon steel almost by a factor of 50. This study clearly ascertains that the poly(2,5-dimethylaniline) has outstanding capability to protect low carbon steel against corrosion in chloride environment.
KeywordsFourier Transform Infrared Spectroscopy Corrosion Rate Salicylate Absorption Spectroscopy Corrosion Potential
Unable to display preview. Download preview PDF.
- 1.T. A. SKOTHEIM (Ed.), “Handbook of Conducting Polymers”, Vols. I and II (Marcel Dekker Inc., New York, 1986).Google Scholar
- 2.H. S. NALWA, “Handbook of Organic Conductive Molecules and Polymers”, Vols. 1–4 (John Wiley and Sons Ltd., 1997).Google Scholar
- 3.P. CHANDRASEKHAR, “Conducting Polymers: Fundamentals and Appplications” (Kluwer Academic Publishers, Dordrecht, Holland, 1999).Google Scholar
- 4.D. E. TALLMAN, G. SPINKS, A. DOMINIS and G. WALLACE, J. Solid State Electrochem. 6 (2002) 73.Google Scholar
- 14.D. W. DEBERRY and A. VIEHBACK, in The Electrochemical Society Softbound proceedings Series, edited by E. Mccaffetry, C. R. Clayton and J. Oudar (Pennington, NJ, 1984), 308.Google Scholar
- 20.V. SHINDE and P. P. PATIL, Mater. Sci. Technol. 19 (2004) 1604.Google Scholar
- 23.M. STERN and A. GEARY, ibid. 104 (1957) 56.Google Scholar
- 24.Electrochemistry and Corrosion—Overview and Techniques, Application Note CORR -4, EG and G, Princeton Applied Research, U.S.A.Google Scholar
- 25.D. E. STILLWELL and S. M. PARK, J. Electrochem. Soc. 135 (1988) 2254.Google Scholar
- 30.S. PATIL, Ph.D. Thesis, North Maharashtra University, Jalgaon, India (2000).Google Scholar