The Inhibition of Sodium Oleate for Pitting Corrosion of Aluminum Alloy 2024 in 0.1 mol L-1 NaCl Solution
Zuo, Yu, Wang, Shiwen, Tang, Yuming, Zhou, Yong
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
The inhibition mechanism of sodium oleate (C17H33COONa) for pitting corrosion of aluminum alloy (AA) 2024 in 0.1 mol L-1 NaCl solution was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy with energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). C17H33COONa showed good inhibition effect on uniform corrosion of AA2024 in 0.1 mol L-1 NaCl solution by promoting surface passivity of aluminum alloy. But in NaCl solution with high concentration (3.5 wt.% NaCl), C17H33COONa could not promote passivity of aluminum alloy. C17H33COONa also suppressed the tendency of pitting initiation and reduced the pitting corrosion sensitivity of aluminum alloy. The addition of 0.1 g L-1 C17H33COONa showed good inhibition performance but further concentration increase had little effect on the inhibition efficiency. The C17H33COO− groups adsorbed on the surface of aluminum alloy by chemical adsorption effect, which promoted oxidation of the aluminum alloy surface.
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