Trends in Applied Sciences Research1819-35792151-7908Science International10.3923/tasr.2011.910.917JamesO.O. AjanakuK.O. OgunniranK.O. AjaniO.O. SiyanbolaT.O. JohnM.O. 8201168The properties of stainless steel makes the alloy suitable for many application; but this tends to change at very aggressive conditions thereby making its properties to fail. The corrosion inhibition efficiency of 2-(4-Methyl-3-oxo-2-phenyl-2, 3-dihydro-1H-pyrazolo [3, 4-b] pyridin-4-yl) acetic acid butylester (PP) on stainless steel in HCl solution was studied by weight loss method. The adsorption mechanism was investigated using adsorption isotherms. The experimental data fit Flory-Huggins and Thermodynamic/El-Awady models. The values for free energy of adsorption, ΔGoads, of PP at different surface coverage, θ, were also calculated by applying the mathematical model of Bockris-Swinkels adsorption isotherm. The variation of free energy of adsorption ΔGoads.with surface coverage, θ, was rationalised in term of interaction between adsorbed PP molecules. A possible adsorption model of PP molecules on to the steel surface was suggested.]]>Abdallah, M.,200382786792El-Maksoud, S.A.A.,20083528555Abd El-Maksoud, S.A. and A.S. Fouda,2005938490Abiola, O.K.,200550685690Abiola, O.K.,20064830783090Abiola, O.K. and N.C. Oforka,200483315322Abiola, O.K. and J.O.E. Otaigbe,20083191198Assaf, F.H., M. Abou-Krish, A.S. El-Shahawy, M.T. Makhlouf and H. Soudy,20072169181Baddoo, N.R.,20086411991206Bockris, J.O.M. and S.U.M. Khan,1993Cardoso, M.V., S.T. Amaral and E.M.A. Martini,20085024292436Chetouani, A., B. Hammouti, T. Benhadda and M. Daoudi,2005249375385Ebenso, E.E.,2003795870Noor, E.A. and A.H. Al-Moubaraki,20083806818Elayyachy, M., M. Elkodadi, A. Aouniti, A. Ramdani, B. Hammouti, F. Malek and A. Elidrissi,200593281285El-Mhammedi, M.A. and A. Chtaini,200763746Garcia-Alonso, M.C., J.A. Gonzalez, J. Miranda, M.L. Escudero, M.J. Correia, M. Salta and A. Bennani,20073715621569Kuprin, V.P., M.V. Ivanova and Y.G. Skrypnik,199935811817Nethercot, D.A. and L. Gardner,20022002pp: 4355Tang, L., X. Li, Y. Si, G. Mu and G. Liu,2006952938Tebbji, K., B. Hammouti, H. Oudda, A. Ramdani and M. Benkadour,200525213781385Veenstra, T.T., G.C.F. Venhorst, J.F. Burger, H.J. Holland, H.J.M. ter Brake, A. Sirbi and H. Rogalla,200747121126Xiang, Z., T. Shujiang, S. Feng and X. Jianing,20062006130135Noor, N.M., N.A.N. Ozman, N. Yahaya and M.M. Din,20112011Oluwadare, G.O. and O. Agbaje,2007724742479