Investigation on the Applicability of Polyaniline in Primer Systems for Metal Protective Coatings in Corrosion Conditions

Investigation on the Applicability of Polyaniline in Primer Systems for Metal Protective Coatings in Corrosion Conditions
V. B. Nguyen, M.T. Pham, C. H. Chu and T. T. Dang

The paper presents some results of comparative investigation on the efficiency of polyaniline (PAni) finely dispersed in polyvinyl butyral as primers in different anticorrosive painting systems. The PAni nanofibres were used for the protective coating purpose. The PAni have various dopants such as inorganic acids (HCl in ES-M samples, H3PO4 in ES-P samples) and organic acid (p toluene sulphonic acid in ES-T samples). The nanostructures of the PAni samples were proved by FE-SEM results. We have investigated comparatively 3 paint systems having the cover coat of polyurethane with different primers: L1 (with ES-M as active component); L2 (with ES-P) and L3 (with ES-T) using salt spray test and electrochemical impedance measurements. Results of salt spray test showed that all the systems having PAni as primers resist over 1440 h (60 cycles). Results of EIS showed that samples using L3 primers gave the highest protective efficiency (with |Z| 0,1Hz = 108Ω.cm2 and its open circuit potential value reached –34.8 mV/SCE after 63 days immersed in 3% NaCl medium). All the research results demonstrated clearly that PAni nanofibres could be a very good component for primer coating systems.

Key words: Polyaniline; nanofibre; primer layer; protective coating systems; FE-SEM result; salt spray test; EIS measurements; protective performances

Kittel, J., Celatin, N., Kaddam, M. and Takenouti, H. (2003) Influenceof the coating-substrate interac-tions on the corrosion protection characterization by impedance spectroscopy of the inner and outer parts of of a coating, Progress Organic Coatings, 46(2), 135–147 .

Alam, J., Riaz, U. and Ahmad, S. (2009) High performance corrosion resistant PAni/alkyd ecofriendly coating, Current Applied Physics, 9(1), 80–86.

Tan, C. K. and Blackwood, D. J. (2003) Corrosion protection by multilayered conducting polymer coatings, Corrosion Science, 45,545–557.

Baldissera, A. F. and Ferreira, C. A. (2012) Coatings based on electronic conducting polymers for corrosion protection of metals, Progress in Organic Coatings, 75, 241–247.

Armelin, E., Marti, M., Liesa, F., Iribarren, J. I. and Aleman, C. (2010) Partial replacement of metallic zinc dust in heavy duty protective coatings by conducting polymer, Progress in Organic Coatings, 69, 26–30.

Armelin, E., Meneguzzi, A., Ferreira, C. A. and Aleman, C. (2009) Polyaniline, polypyrrole and poly(3,4-ethylenedioxythiophene) as additives of organic coatings to prevent corrosion, Surface and Coatings Technology, 203, 3763–3769.

Sathiyanarayanan, S. et al. (2008) Corrosion pro-tection of magnesium alloy ZM21 by polyaniline-blend coatings, Journal of Coatings Technology Research, 5(4), 471–477.

Radhakrishnan, S., Siju, C. R., Mahanta, D., Patil, S. and Madras, G. (2009) Conducting polyaniline-nano-TiO2 composites for smart corrosionresistant coatings, Electrochimica Acta, 54, 1249–1254 .

Lambourne, R. and Strivens, T. A. (1999) Paint and Surface Coatings, William Andrew Publishing.

Tracton, A. A. (2006) Coatings Technology Handbook, 3rd edn, Taylor & Francis Group, London.

Bac, N. V. (2010) Investigation on the environmen-tal friendly protective paints, Final Scientific Report of the Vietnam - Italia Cooperation Project.

Bac, N. V. (2010) Research on the influence of different acids on the structures and properties of PAni, Journal of Chemistry, 48(A),197–202.

Yang, X., Li, B., Wang, H. and Hou, B. (2010) Anticorrosion performance of polyaniline nanostructures on mild steel, Progress in Organic Coatings, 69(3), 267–271.

Kalendova, A., Vesely, D. and Stejskal, J. (2008) Organic coatings containing PAni and inorganic pigments as corrosion inhibitors, Progress Organic Coatings, 62,105–116.

Zarnas, P. et al. (2003) Progress in using conduc-ting polymer as corrosion inhibiting coatings, Radiation Physics and Chemistry, 68, 387–394 .

Kinlen, P. J. et al. (1997) Corrosion protection using polyaniline coating formulations, Synthesis Metals, 85, 1327–1332.

Kinlen, P. J. et al. (1999) Corrosion, passivation and anodic films—a mechanistic investigation of polyaniline corrosion protection using scanning reference electrode technique, Journal of the      Electrochemical Society, 146, 3690–3695.

Kinlen, P. J. et al. (2002) Corrosion protection of mild steel using sulphonic and phosphonic acid- doped polyanilines, Corrosion, 58, 490–497.

Sathiyanarayanan, S. (2005) Corrosion protection of steel by polyaniline (PANI) pigmented paint coating, Progress in Organic  Coatings, 53, 297–301.

Sathiyanarayanan, S. (2006) Performance of poly-aniline pigmented vinylacrylic coating on steel in aqueous solutions, Progress in Organic Coatings, 55, 5–10.

Bierwagen, G. P., He, L., Li, J., Ellingson, L. and Tallman, D. E. (2000) Studies of a new accelerated evaluation method for coating corrosion resistance—thermal cycling testing, Progress in Organic Coatings, 39(1), 67–78.

Skotheim, T. A. and Reynolds, J. R. (2007)  Conjugated Polymers: Theory, Synthesis, Properties and Characterization, CRC Press – USA.

Sathiyanarayanan, S., Muthukrishnan, G. and Venkatachari, G. (2006) Corrosion protection of steel by polyaniline blended coating, Electrochimica Acta, 51, 6313–6319.

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