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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). As camadas de fosfato do tipo hopeíta, nas quais o zinco é parcialmente substituído por outros metais, como manganês e níquel, são de grande interesse para a indústria automotiva e de eletrodomésticos. Essas indústrias utilizam aços galvanizados, fosfatizados e pintados com eletropintura cataforética. Os fosfatos de zinco modificados com manganês e níquel são isomorfos com a hopeíta, e de difícil identificação usando-se a técnica de difração de raios X. Nesse trabalho, as camadas de conversão de fosfato foram identificadas usando-se a espectroscopia no infravermelho por transformada de Fourier (FTIR)

Infrared-spectroscopy analysis of zinc phosphate and nickel and manganese modified zinc phosphate coatings on electrogalvanized steel