UV–Vis–NIR and IR reflectance of thin films of ZnCrO4 and CrPO4 on metallic substrates are analyzed in order to elucidate the mechanism of formation of the chromate conversion coatings. The infrared reflectance spectra of these systems, unlike those of thin oxide films on metals, are not complicated by distorted band shapes and frequency shifts. The PO3−4 and CrO2−4 may be characterized by the LO components of the v3 vibration at 1080 and 960 cm−1.
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Lenglet et al. (1994) studied this question.
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