Effect of the cerium (III) chloride heptahydrate on the corrosion inhibition of aluminum alloy |
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Authors: | Marin Kurtela Vinko ?imunovi? Ivan Stojanovi? Vesna Alar |
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Affiliation: | Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia |
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Abstract: | In the present work, the corrosion protection of aluminum alloy AA2024-T3 has been studied in NaCl solution, with and without the addition of cerium (III) chloride heptahydrate. The corrosion inhibitor efficiency after immersion into 10 mM NaCl, with or without 3 mM of CeCl3·7H2O at 20°C, 40°C, and 60°C was investigated. The performed quantitative tests include electrochemical techniques, such as the method of quasipotentiostatic polarization (Tafel extrapolation), cyclic polarization, and electrochemical impedance s pectroscopy to determine corrosion rate (vcorr), inhibition ef?ciency (η %), protective ability (γ), degree of coverage (?), and pitting nucleation resistance. The samples were analyzed with scanning electron microscopy and energy dispersive X-ray analysis to evaluate and characterize the precipitates formed on the surface of aluminum samples and to determine dominant type of corrosion. The formation of Ce3+ precipitates occurred on cathodic intermetallic sites and the surface, in general, resulting in improved corrosion resistance. Tested cerium (III) chloride heptahydrate proved to be an effective inorganic corrosion inhibitor for AA2024-T3 in chloride solution, which, by the action of cerium ions, reduced corrosion on the surface of the studied aluminum alloy. |
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Keywords: | aluminum alloy cerium (III) chloride heptahydrate chloride solution electrochemical techniques pitting corrosion |
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