Análise por espectroscopia no infravermelho das camadas de fosfato de zinco e de zinco modificado com níquel e manganês em a？o eletrogalvanizado

hopeite-type phosphate coatings in which zinc is partially replaced by other metals like manganese and nickel are of great interest for the automotive and home appliance industries. such industries use phosphate conversion coatings on galvanized steels in association with cataphoretic electropainting. zinc phosphates modified with manganese and nickel are isomorphic with the hopeite, and the phase identification using x-ray diffraction is difficult. in this paper, the phosphate coatings are identified using the fourier transform infrared spectroscopy (ftir).