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Effect of thermal annealing of poly(3-octylthiophene) films covered stainless steel on corrosion properties

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Abstract

The effect of thermal annealing of poly(3-octylthiophene) (P3OT) coatings on the corrosion inhibition of stainless steel in an NaCl solution was investigated. P3OT was synthesized by direct oxidation of the 3-octylthiophene monomer with ferric chloride (FeCl3) as oxidant. P3OT films were deposited by drop-casting technique onto 304 stainless steel electrode (304SS). 304SS coated with P3OT films were thermally annealed during 30 h at different temperatures (55°C, 80°C, and 100°C). The corrosion resistance of stainless steel coated with P3OT in 0.5 M NaCl aqueous solution at room temperature was investigated by using potentiodynamic polarization curves, linear polarization resistance, and electrochemical impedance spectroscopy. The results indicated that the thermal treatment at 80°C and 100°C of P3OT films improved the corrosion resistance of the stainless steel in NaCl solution; the speed of corrosion diminished in an order of magnitude with regard to the 304SS. In order to study the temperature effect in the morphology of the coatings before and after the corrosive environment and correlate it with corrosion protection, atomic force microscopy and scanning electron microscopy were used. Morphological study showed that when the films are heated, the grain size increased and a denser surface was obtained, which benefited the barrier properties of the film.

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Acknowledgements

The authors thank the financial support from Consejo Nacional de Ciencia y Tecnología (CONACYT, Mexico, 52598-R) and Daniel Bahena Uribe for AFM images.

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Authors and Affiliations

  1. Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEMor., Av. Universidad 1001, Col. Chamilpa, Cuernavaca, 62209, Morelos, Mexico

    M. E. Nicho & J. G. González-Rodríguez

  2. Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Mexico

    U. León-Silva & J. G. Chacón-Nava

  3. Instituto de Investigaciones Eléctricas, Av. Reforma # 113, Temixco, C.P. 62490, Morelos, Mexico

    V. M. Salinas-Bravo

Authors
  1. U. León-Silva
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  2. M. E. Nicho
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  3. J. G. González-Rodríguez
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  4. J. G. Chacón-Nava
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  5. V. M. Salinas-Bravo
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Correspondence to M. E. Nicho.

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León-Silva, U., Nicho, M.E., González-Rodríguez, J.G. et al. Effect of thermal annealing of poly(3-octylthiophene) films covered stainless steel on corrosion properties. J Solid State Electrochem 14, 1089–1100 (2010). https://doi.org/10.1007/s10008-009-0918-y

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  • DOI: https://doi.org/10.1007/s10008-009-0918-y

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