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Effect of the cerium (III) chloride heptahydrate on the corrosion inhibition of aluminum alloy
Author(s) -
Kurtela Marin,
Šimunović Vinko,
Stojanović Ivan,
Alar Vesna
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911057
Subject(s) - corrosion , tafel equation , materials science , cerium , chloride , alloy , polarization (electrochemistry) , pitting corrosion , scanning electron microscope , aluminium , nucleation , metallurgy , electrochemistry , nuclear chemistry , inorganic chemistry , chemistry , composite material , organic chemistry , electrode
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 CeCl 3 ·7H 2 O 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 ( v corr ), inhibition efciency (η %), protective ability (γ), degree of coverage (ϑ), 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 Ce 3+ 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.