Characterization and corrosion protection properties of polypyrrole / montmorillonite electropolymerized onto aluminium alloy 1100 |
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Authors: | Kátia R L Castagno Viviane Dalmoro Raquel S Mauler Denise S Azambuja |
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Affiliation: | 1.Department of Chemistry,Federal Institute Sul-rio-grandense—IFSul,Pelotas,Brazil;2.Institute of Chemistry,Federal University of Rio Grande do Sul—UFRGS,Porto Alegre,Brazil |
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Abstract: | Films of Polypyrrole/Montmorillonite (PPy/MT) clays were electropolymerized potentiostatically on aluminium alloy 1100, using
sodium dodecylbenzenesulfonate (SDBS) as a dopant. Two clay species were used: Na+-Montmorillonite (MT-Na) and modified-Montmorillonite (MT-M). The characterization of the PPy/MT films performed by XRD and
TEM shows that the exfoliation method employed, as well the electrochemical polymerization method used in this work, allow
nanocomposite materials to be obtained. The PPy/MT films were found to have less electrical conductivity than pure PPy. The
corrosion protection of aluminium alloy 1100 covering PPy/MT was evaluated by electrochemical techniques in 0.05 mol L−1 NaCl medium. The electrochemical parameters derived from the polarization curves, together with the EIS data, revealed that
the corrosion resistance of PPy/clay coatings depends on the type and concentration of Montmorillonite employed. The best
performance in the corrosion protection of the aluminum was achieved with PPy/MT films containing 1% of clay. |
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