High temperature long-lasting corrosion inhibition mechanism of sodium dodecyldiphenyl ether disulfonate on ADC12 aluminum alloy in oxalic acid solution

The high temperature corrosion inhibition mechanism of sodium dodecyl diphenyl ether disulfonate (MADS) on ADC12 aluminum alloy in oxalic acid solution at 80 °C was investigated using electrochemical measurements, surface characterization and theoretical computations. The results manifested that MADS still had excellent performance in high-temperature oxalic acid solution, and was a highly efficient and long-lasting corrosion inhibitor with an optimal corrosion inhibition efficiency (ƞ) of 90.90 %. With increasing soaking time, the ƞ increased to 98.70 %. MADS molecule adsorbed on the aluminum alloy surface in an L-shaped walking scooter configuration through physicochemical adsorption to form a dense, thin and stable hydrophobic film, inhibiting the formation of aluminum oxalate and Al2O3, and protecting it from corrosion. [Display omitted] •High temperature corrosion inhibition mechanism of MADS on ADC12 Al alloy was first studied.•MADS was an efficient and long-lasting corrosion inhibitor for the Al alloy.•MADS formed a dense, thin and stable hydrophobic film on the Al alloy surface.•MADS inhibited the formation of aluminum oxalate and Al2O3.•MADS molecule adsorbed on the Al alloy surface in an L-shaped walking scooter configuration.