Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32727
Application of Stabilized Polyaniline Microparticles for Better Protective Ability of Zinc Coatings

Authors: N. Boshkova, K. Kamburova, N. Tabakova, N. Boshkov, Ts. Radeva


Coatings based on polyaniline (PANI) can improve the resistance of steel against corrosion. In this work, the preparation of stable suspensions of colloidal PANI-SiO2 particles, suitable for obtaining of composite anticorrosive coating on steel, is described. Electrokinetic data as a function of pH are presented, showing that the zeta potentials of the PANI-SiO2 particles are governed primarily by the charged groups at the silica oxide surface. Electrosteric stabilization of the PANI-SiO2 particles’ suspension against aggregation is realized at pH>5.5 (EB form of PANI) by adsorption of positively charged polyelectrolyte molecules onto negatively charged PANI-SiO2 particles. The PANI-SiO2 particles are incorporated by electrodeposition into the metal matrix of zinc in order to obtain composite (hybrid) coatings. The latter are aimed to ensure sacrificial protection of steel mainly in aggressive media leading to local corrosion damages. The surface morphology of the composite zinc coatings is investigated with SEM. The influence of PANI-SiO2 particles on the cathodic and anodic processes occurring in the starting electrolyte for obtaining of the coatings is followed with cyclic voltammetry. The electrochemical and corrosion behavior is evaluated with potentiodynamic polarization curves and polarization resistance measurements. The beneficial effect of the stabilized PANI-SiO2 particles for the increased protective ability of the composites is commented and discussed.

Keywords: Corrosion, polyaniline particles, zinc, protective ability.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 754


[1] E. Armelin, C. Aleman, J. I. Iribarren, Anticorrosion performances of epoxy coatings modified with polyaniline: A comparison between the emeraldine base and salt forms, Prog. Org. Coat. 65 (2009) 88-93.
[2] Y. Zhang, Y. Shao, X. Liu, C. Shi, Y. Wang, G. Meng, X. Zeng, Y. Yang, A study on corrosion protection of different polyaniline coatings for mild steel, Prog. Org. Coat. 111 (2017) 240-247.
[3] R. J. Holness, G. Williams, D. A. Worsley, H. N. McMurray, Polyaniline inhibition of corrosion-driven organic coating cathodic delamination on iro, J. Electrochem Soc. 152 (2005) B73-B81.
[4] G. M. Spinks, A. Dominis, G. G. Wallace, Comparison of emeraldine salt, emeraldine base, and epoxy coatings for corrosion protection of steel duringimmersion in a saline solution, Corrosion 59 (2003) 22–31.
[5] Y. Luo, A. Vimalanandan, X. Wang, M. Rohwerder, Study of the buried interface between zinc and emeraldine base coating, Electrochimica Acta 161 (2015) 10–16.
[6] J. Stejskal, P. Kratochvil, S. P. Armes, S. F. Lascelles, A. Riede, M. Helmstedt, J. Prokes, I. Krivka, Polyaniline dispersions. 6. Stabilization by colloidal silica particles, Macromolecules 29 (1996) 6814-6819.