IDENTIFICATION OF THIN-FILMS ON ZINC SUBSTRATES BY FTIR AND RAMAN SPECTROSCOPIES

Raman and FTIR reflectance spectroscopies have been used for the chara cterization of the following zinc corrosion products formed by atmosph eric corrosion : (epsilon-Zn(OH)(2), hydrozincite Zn-5(CO3)(2)(OH)(6), simonkolleite Zn5Cl2(OH)(8),H2O and zinc sulfates ZnSO4,H2O, Zn4SO4(O H)(6),5H(2)O and Zn4SO4(OH)(6),H2O. The samples to analyze are either developed on metal or obtained by incrustation of submicronic particle s of the compound on the surface on zinc substrates. Both the IR refle ctance and Raman spectroscopies allow an easy identification of basic zinc salts : chloride by the Zn-O-H bending modes, carbonate and sulfa tes by the internal mode of the corresponding anion (nu(3) region), A multianalytical approach combining FTIR reflectance spectroscopy, graz ing incidence X-ray diffraction and SEM/EDS leads to different applica tions.