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Synergistic corrosion inhibition study of Armco iron in sodium chloride by piperidin-1-yl-phosphonic acid-Zn system |
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| Authors: | H Amar J Benzakour D Villemin T Braisaz |
| Affiliation: | a Corrodys, Centre de Corrosion Marine et Biologique, 55 rue Beuzeville, BP 9, 50120 Equeurdreville - Hainneville, France b Laboratoire d’Electrochimie et de Chimie Analytique, Université Cadi Ayyad, Faculté des Sciences Semlalia, BP 2390 Marrakech, Morocco c École Nationale Supérieure d’Ingénieurs de Caen UMR 6507 CNRS, Bd Maréchal Juin 14050 Caen Cedex, France d Laboratoire d’Environnement, d’Electrochimie et de Réactivité aux interfaces, Faculté des Sciences et Techniques, BP 509 Boutalamine, Errachidia, Morocco |
| Abstract: | Electrochemical techniques, weight loss method and surface analysis were used to study the synergistic inhibition offered by Zn2+ and piperidin-1-yl-phosphonic acid (PPA) to the corrosion of Armco iron in 3% chloride solution. It is observed that the combination between PPA and Zn2+ shows excellent inhibition efficiency. The potentiodynamic polarization curves reveal that 5 × 10−3 mol l−1 of PPA has only 76.7% inhibition efficiency whereas the mixture containing 5 × 10−3 mol l−1 PPA -20%Zn2+ has 90.2% inhibition efficiency. This suggests that a synergistic effect exists between Zn2+ and PPA. The Fourier transform infrared (FTIR) spectrum of the film formed on iron indicates phosphonates zinc salt formation. A suitable mechanism of corrosion inhibition is proposed based on the results obtained. The surface film analysis showed that in the absence of Zn2+, the protective film consists of Fe2+-PPA complex formed on the anodic sites of the metal surface, whereas in the presence of Zn2+, the protective film consists of Fe2+-PPA complex and Zn(OH)2. |
| Keywords: | A Iron A PPA C Corrosion C Inhibition C Synergistic effect |
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