Abstract
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.
Highlights
The application of inhibitors is one of the most practical methods for protection against corrosion of metals.[1]
The corrosion inhibition of C17H33COONa for aluminum alloy in 0.1 mol L-1 NaCl solution includes two sides: on one side, C17H33COO− ions are partially hydrolyzed in solutions to produce OH−, increasing the cathodic reaction rate and enhancing the Al(OH)[3] formation on the alloy surface
C17H33COONa adsorbed on the aluminum alloy surface through electrostatic adsorption or chemisorption form barrier films, preventing the corrosion process and impeding the adsorption and ingress of chloride ions
Summary
The application of inhibitors is one of the most practical methods for protection against corrosion of metals.[1].
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