Abstrato

Inhibition of corrosion of mild steel by 7-[2-amino-2-(4-hydroxyphenyl)-acetyl]amino-3,3-dimethyl-6-oxo-2-thia-5-azabicyclo[3.2.0]heptane-4-carboxylic acid

N.O.Eddy, S.A.Odoemelam, N.W.Akpanudoh

7-[2-amino-2-(4-hydroxyphenyl)-acetyl]amino-3,3-dimethyl-6-oxo-2-thia-5- azabicyclo[3.2.0]heptane-4-carboxylic acid has been found to inhibit the corrosion of mild steel in 2.5M H2SO4. Inhibition efficiency of different concentrations ofA(0.1-0.5g/dm3) ranged between 34.79-52.30 and 7.49- 24.23 at 303 and 333K respectively.Mechanismof inhibition ofmild steel corrosion by A is through spontaneous physical adsorption process(Gads= -0.8853 and -3.7274KJ/mol at 303 and 333Krespectively). Adsorption ofAonmild steel surface is endothermic(Hads=positive) and is characterized by high and positive values of Sads indicating the formation of a stable complex.