The effect of temperature on fluoride adsorption behavior of adsorption by thermo treated samples of aluminum alloy AMG-6 electrochemical machining products has been studied. Kinetic curves and adsorption isotherms at solution temperatures 20, 30, and 400С have been reseived and the adsorption velocity constants, diffusion coefficients and the values of activation energy have been determined. The Ea value obtained corresponds to values of activation energy characteristic for ion exchange processes controlled by internal diffusion. Thermodynamic functions of the adsorption process − ΔF0, ΔH0, and ΔS0 have been calculated. Differential free molar energy changes, isosteric heat and entropy of fluorine adsorption have been analyzed versus the filling degree of samples surface with fluorine-ions. The absence of process rate dependence on mixing velocities as well as the character of dependences of F (equilibrium degree reaching, %) on t demonstrate that the process under consideration is controlled by internal diffusion step. The mechanism of fluorine ions fixation on the modified surface of aluminum oxyhydrates has been discussed.