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Poly(3‐octylthiophene) thermally treated as coating for corrosion protection of SS304 in sulfuric acid media
Author(s) -
LeónSilva U.,
Nicho M. E.,
GonzálezRodríguez J. G.,
ChacónNava J. G.,
SalinasBravo V. M.
Publication year - 2013
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201206538
Subject(s) - materials science , dielectric spectroscopy , corrosion , sulfuric acid , coating , metallurgy , polarization (electrochemistry) , annealing (glass) , electrochemistry , chemical engineering , composite material , electrode , chemistry , engineering
Poly(3‐octylthiophene) (P3OT) was synthesized by direct oxidation of the 3‐octylthiophene monomer using ferric chloride (FeCl 3 ) as an oxidant. Using the drop‐casting technique, P3OT coatings were deposited onto 304 type stainless steel electrodes. For the purpose of determining the effect of thermal annealing on the corrosion protection of stainless steel with P3OT coatings, the coated electrodes were thermally annealed for 30 h at two different temperatures, 55 and 100 °C. The corrosion behavior of P3OT coated stainless steel was investigated in 0.5 M sulfuric acid (H 2 SO 4 ) at room temperature using potentiodynamic polarization curves (PPC), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS). The results indicated that the thermally treated P3OT coatings improved the corrosion resistance of the stainless steel in 0.5 M H 2 SO 4 . The best corrosion protection was obtained by the P3OT coating annealed at 100 °C. In order to study the temperature effect on the morphology of the coatings before and after the corrosive environment and compare it with corrosion protection, atomic force microscopy (AFM) and scanning electronic microscopy (SEM) were used.