Investigations of synergistic effect of surfactants as corrosion inhibitor on steel Available to Purchase

The inhibition performances of the inhibitors C₈TAB-MP (a mixture of octyltrimethylammonium bromide (C₈TAB) and 4-mercaptopyridine (4MP)), C₈TAB and 4MP toward A₃ steel in 0.5 M hydrochloric acid solution were studied at 25°C. The studied inhibitors worked in a hybrid form, mainly controlling the cathodic reaction. Their adsorption follows the Langmuir isotherm, and the compositional combination is superior to the sum of their individual properties. The highest inhibition efficiency of C₈TAB-MP was 99.4% at a concentration of 200 mg/l. The surface morphologies of samples were obtained from atomic force microscopy tests. The synergistic effect between C₈TAB and 4MP was due to the C₈TAB molecules donating electrons and the 4MP molecules accepting electrons.