Abstract: The effects of anions(SH^- and SCN^-)on inhibition and adsorption behaviors of butyltrimethylphosphonium bromide(BTMPB)for corrosion inhibition of aluminum have been studied by using the differential polarization resistance and impedance determination techniques in 1 mol/L Al(ClO₄)₃ solution at 25～45℃.The results showed that SH^- or SCN^- can increase prominently the inhibitive efficiency of BTMPB for corrosion inhibition of aluminum,and that the synergistic effect of corrosion inhibition appears between the anions and BTMPB.The adsorption of BTMPB follows Langmuir isotherm on the aluminum surface in 1 mol/L Al(ClO₄)₃ solution,and it belongs to the physical adsorption.When the anions are added to 1 mol/L Al(ClO₄)₃ solution containing BTMPB,the adsorption of BTMPB belongs to the chemical adsorption,and it follows the amended Bockris-Swinkels isotherm.

Key words: anion, phosphonium salt, aluminum, inhibition, adsorption