The Inhibition of Sodium Oleate for Pitting Corrosion of Aluminum Alloy 2024 in 0.1 mol L^-1 NaCl Solution

AUTOR(ES)

Zuo, Yu, Wang, Shiwen, Tang, Yuming, Zhou, Yong

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2015-08

RESUMO

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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