Adsorption of the inhibitor octadecyldimethylbenzylammonium chloride (ODBAC) to two carbon steel microstructures, one ferritic-pearlitic and one martensitic, in 0.15 M sodium carbonate (Na2CO3) + 0.15 M sodium bicarbonate (NaHCO3) solution of pH 10 was investigated using surface-enhanced Raman spectroscopy (SERS). ODBAC physisorbed strongly to the ferritic-pearlitic steel and weakly to the martensitic steel. A weak metal-ODBAC bond formed between the metal surface and the ODBAC ring substituent, oriented at an inclined angle to the metal surface. Physisorption of ODBAC was found to depend upon potential, and this was correlated to the potential-dependent presence of magnetite (Fe3O4).
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Oblonsky et al. (1995) studied this question.
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