Improvement of corrosion protection of steel by incorporation of a new phosphonated fatty acid in a phosphorus-containing polymer coating obtained by UV curing |
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Authors: | France Millet Rémi Auvergne Sylvain Caillol Ghislain David Abdelatif Manseri Nadine Pébère |
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Affiliation: | 1. Université de Toulouse, CIRIMAT, UPS/INPT/CNRS, ENSIACET, 4 allée Emile Monso BP 44362, 31030 Toulouse Cedex 4, France;2. Institut Charles Gerhardt UMR CNRS 5253, Laboratoire Ingénierie et Architecture Macromoléculaire, Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 05, France |
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Abstract: | Six formulations containing diacrylate monomers (from 89 to 92.5% (w/w)) as well as a phosphonated methacrylate monomer (from 1 to 10% (w/w)) were prepared. All formulations were UV-cured and the corrosion performance of the resulting coatings applied onto a steel substrate was assessed by electrochemical impedance spectroscopy (EIS). It was first shown that the coatings containing phosphonic acid methacrylate (MAPC1(OH)2) instead of methacrylate phosphonic dimethyl ester (MAPC1) presented higher corrosion protection related to the strong adhesive properties of phosphonic acid on the metal substrate. A minimum MAPC1(OH)2 content of 2.5% was determined to provide the highest impedance values (best efficiency). Then, a new bio-based compound, i.e. phosphonic acid-bearing oleic acid (phosphonated fatty acid), was synthesized and added as an inhibitor to the formulations. In the presence of this compound, the corrosion protection was notably improved. The beneficial effect of phosphonated fatty acid was explained by its inhibitive action at the steel/coating interface and by the improvement of the barrier properties. |
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Keywords: | Phosphonated methacrylate Coating Phosphonated fatty acid Inhibitor Electrochemical impedance spectroscopy |
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