On construction of the structures of adsorbed films of mefenamic and phenylundecanoic acids on passive iron

Successive adsorption of the components of a mixed inhibitor at oxidized iron was further studied by ellipsometry and IR spectroscopy. The mixed inhibitor was composed of salts of aromatic amino acids, viz., sodium mefenamate (SMEF) NaOOCC₆H₄NHC₆H₃(CH₃)₂ and sodium phenylundecanoate (SPU) C₆H₅(CH₂)₁₀COONa. Ultrathin adsorbed films obtained on oxidized iron by different methods were tested in a moist atmosphere to compare their protective properties. Adsorbed PU forms an iron complex on oxidized iron. Adsorption of MEF anions over a PU layer changes the IR spectral pattern, thus indicating a change in the adsorption mechanism of MEF anions in the presence of PU anions. Original Russian Text ? Yu.I. Kuznetsov, N.P. Andreeva, N.P. Sokolova, R.A. Bulgakova, A.M. Gorbunov, 2007, published in Zashchita Metallov, 2007, Vol. 43, No. 4, pp. 339–345.