JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 65 No 4 (2020): Journal of the Chilean Chemical Society
Original Research Papers

EFFECT OF THE MONOMERS RATIO IN THE ELECTROSYNTHESIS OF POLY(ANILINE-CO-O-METHOXYANILINE) ON STEEL CORROSION PROTECTION

Andres Mauricio Ramírez
Universidad Mayor
M.A del Valle
Pontificia Universidad Católica de Chile,
Bio
A. Motheo
Universidade de São Paulo
Bio
F. Mieres
Universidad Mayor
Bio
Published November 15, 2020
Keywords
  • AISI-304 steel,
  • conducting polymer,
  • corrosion,
  • poly(aniline),
  • poly(aniline-co-o-methoxyaniline),
  • poly(o-methoxyaniline)
  • ...More
    Less

Abstract

In this work, the synthesis of poly(aniline-co-o-methoxyaniline) was carried out on AISI 304 steel, by voltammetric or potentiostatic method. Electropolymerization was achieved from different ratios of 0.4 mol·L-1 aniline/o-methoxyaniline monomers in 1.0 mol·L-1 H2SO4. Homo- and copolymers were characterized by cyclic voltammetry, infrared spectroscopy, and scanning electron microscopy. Furthermore, the electrodeposits were studied with a view to their use as corrosion protectors, for which their polarization curve was measured in NaCl 3% and, after 168 h, the surface of the steel was also evaluated by optical microscopy. It was observed that the reactivity that the o-methoxy group gives to the aniline ring reduces the protection against corrosion due to the excessive inclusion of N-phenyl-1,4-benzo quinone-di-imine oligomers and/or with an oxazine structure. On the other hand, the optical images confirm the surface damage of the steel, correlating with SEM images that show morphological changes associated with the progress of synthesis and the o-methoxy group. Nevertheless, under optimal conditions, poly(aniline-co-o-methoxyaniline) modifies the corrosion potential of AISI 304 steel, displacing it by 0.283 V. Furthermore, the presence of small pits and the absence of surface oxide was observed, indicating a significant delay in the oxidation of AISI-304 steel.

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