Anti-Corrosion Characteristics of Steel Structures with Polyaniline Anti-Corrosive Coatings

강 구조물에 대한 폴리아닐린 함유도료의 방청특성

  • Received : 2010.05.03
  • Accepted : 2010.06.22
  • Published : 2010.06.30


In preparative anti-corrosive coating experiments, polyaniline was obtained by reacting an oxidizing agent with the monomer aniline. Further, the primer coating was prepared using a variety of widely-used materials such as urethane resin. For the top coating, epoxy resin and acrylic urethane resin were used. Characteristics of the coatings were assessed according to KS and ASTM specifications, and the structure of the polyaniline was characterized using FT-IR and TGA. For analysis of anti-corrosive properties in salt-spray experiments, measurements of the oxidation state of iron and surface atomic analysis were conducted using XPS and SEM-EDX. Unlike general anti-corrosive coatings which exhibit anti-corrosive effects only as a primer coating, the anti-corrosive coatings using polyaniline as the anti-corrosive pigment showed a marked synergistic effect with the top coatings. In other words, the top coatings not only produce a fine view effect, but also increase, through interaction with the primer coatings, the resistance to diffusion of corrosive factors from the external environment. It was also found that, unlike the heavy metal oxide-forming layer of the passive barrier alone, the polyaniline anti-corrosive pigment oxidized iron at the interface with the iron substrate to form a passive barrier in the oxidic layer, and itself formed a potential barrier layer with anti-corrosive factors from the external environment. Although the passive layer was damaged, the damaged area did not become completely oxidized iron; on the contrary, it showed a tendency to reduction. This can be interpreted such that a passive layer is formed again on the damaged area, and that at the same time there is a tendency to self-healing.


polyaniline;resin;corrosion;anti-corrosive coatings


  1. Lacroix, J. C., Camalet, J. L., Aeiyach, S., Chane- Ching, K. I., Petitjean, J., Chauveau, E. and Lacaze, P. C. : Aniline electropolymerization of Mild Steel and zinc in a two-step process. Journal of Electroanalytical Chemistry, 481, 7681-7683, 2000.
  2. Chen, X. H. and Wei, K. : Effect of aluminum and silicon on atmospheric corrosion of low-alloying steel under containing $NaH_{s}O_{3}$ wet/dry environment. Corrosion Science and Technology, 7(6), 315-319, 2008.
  3. Lee, S. H. : A study on the application to anti-corrosive film of acryl emulsion for the reducing of environmental pollutants. The Corrosion Science Society of Korea, 8(5), 197-202, 2009.
  4. Kazuhiko Noda and Hiroyuki Masuda : Atmospheric corrosion behavior on low alloy steels under seashore environment. Corrosion Science and Technology, 31(3), 219-223, 2002.
  5. Spengler, E., Fragata, F. L., Margarit, I. C. P. and Mattos, O. R. : Corrosion protection of low toxicity paints. Progress in Organic Coatings, 30(12), 51-57, 1997.
  6. Ferrari, G. M. and Gyver, D. J. : Synthesis of ceramic protective coatings for chemical plant parts operated in Hi-temperature and corrosive/erosive environment. Corrosion Science, 44(2), 301-309, 2004.
  7. Zhong, C. : A new technology of anti-corrosive of metals in atmospheric environment. Corrosion Science and Technology, 2(4), 193-198, 2003.
  8. Talo, A., Passiniemi, P., Forsen, O. and Ylasaari, S. : Polyaniline/epoxy coating with good anti-corrosion properties. Synthetic Metals, 85, 1333-1334, 1997.
  9. Manivel, P. and Venkatachari, C. : The inhibitive effect of poly(p-Anisidine) on corrosion of iron in 1 M HCl solutions. Synthetic Metals, 129, 212-219, 2007.
  10. Mirmohseni, A. and Oladegaragoze, A. : Anti-corrosive properties of polyaniline coating on iron. Synthetic Metals, 114, 105-108, 2000.
  11. Wei, X. L., Wang, Y. Z. and Bobechzko, C. : Synthesis and physical properties of highly sulfonated polyaniline. Journal of American Chemical Society, 118, 2545-2555, 1996.
  12. E.U. Pat., No. 0 995 769 A1 :Method for Production of Water-Soluble Conducting Polyaniline, 2000.
  13. Ito, S., Murata, K. and Hoffman, B. M. : Simple synthesis of water-soluble conducting polyaniline. Synthetic Metals, 96, 161-163, 1998.
  14. Niziol, J. and Laska, J. : Conductivity of blends of polyaniline with PMMA cellulose acetate. Synthetic Metals, 101, 720-721, 1999.
  15. Yang, S. M. and Lee, H. L. : The conductivity and morphology of the blend of polyaniline and water based polyurethane. Synthetic Metals, 102, 1226-1227, 1999.
  16. Kong, S. D. and Park, J. U. : Characteristic of polyaniline anti-corrosive coating with primer and top coating resins. Journal of Korean Oil Chemists Society, 24(4), 399-409, 2007.
  17. Kong, S. D. and Park, J. U. : Preparation and characteric of anti-corrosive coating for steel structure using polyaniline. Journal of Korean Oil Chemists Society, 23(3), 230-238, 2006.
  18. Cho S. Y. : XPS and electrochemical studies of amorphous Ni-Nb-Ta-P alloys in 12 M HCl. The Corrosion Science Society of Korea, 31(6), 438-443, 2002.
  19. Park, S. Y. and Lee, J. W. : Corrosion of stainless steel in electrolyzed water. Journal of Corrosion Science Society Korea, 6(1), 1-8, 2007.
  20. Cho, S. Y. : Self-healing coatings for an anti-corrosion barrier in damaged parts. Corrosion of Corrosion Science Society Korea, 8(6), 223-226, 2009.