Corrosion protection of steel by sulfo-doped polyaniline-pigmented coating
| Autor: | A. Benaboura, S. Lamouri, François Xavier Perrin, A. Sakhri, Emmanuel Aragon |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Conductive polymer Materials science General Chemical Engineering Organic Chemistry Sulfonic acid engineering.material Conductivity Surfaces Coatings and Films Corrosion chemistry.chemical_compound chemistry Coating Natural rubber visual_art Polyaniline Materials Chemistry engineering visual_art.visual_art_medium Composite material Benzene Nuclear chemistry |
| Zdroj: | Progress in Organic Coatings. 72:473-479 |
| ISSN: | 0300-9440 |
| DOI: | 10.1016/j.porgcoat.2011.06.005 |
| Popis: | This work presents the corrosion protection behaviour of mild steel in neutral saline conditions (salt spray/immersion) by using coatings based on chlorinated rubber and benzene-sulfonate (BS) or lignosulfonate (LS)–doped polyaniline (PANI). Standardized accelerated (salt spray) and immersion tests were performed to assess the protective performance of the coatings. Analysis and interpretation of the experimental data (i.e., EIS, potentiodynamic data and visual observations) showed that both PANI–BS and PANI–LS inhibit corrosion of painted steel exposed to a 3.5% NaCl solution. Among the tested concentrations (0.5, 1.5 and 3 wt.%), the greatest inhibition was observed at low concentration of PANI–BS (0.5%). Samples with higher PANI–BS loadings (1.5 and 3%) appear severely corroded after 560 h of salt spray exposure, which was related to the release of corrosive benzene sulfonic acid. On the contrary, the coatings with lignosulfonate doped PANI performed well both in the salt spray and immersion tests, especially at the highest PANI concentrations (1.5 or 3%). With regard to the healing properties, PANI–LS with the lowest conductivity (1 S cm −1 ) performed the best. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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