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UV-Vis-NIR and IR reflectance of thin films of ZnCrO, and CrPO, on metallic substrates arc 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 PO:and Cr0:may be characterized by the LO components of the v3 vibration at 1080 and 960 an-'.Les spectres de rktlexion de films minces de ZnCrO, et CrPO, suc substrats mktalliques ont ete Ctudies dans le domaine: 0,03 a 6 eV a des fins analytiques en vue d'une mcillcure connaissance d u mkcanisme de formation et de la composition des couches de chromatation. Les spectres vibrationnels obtenus en reflexion speculaire pour de tels systemes sont comparables a ceux obtenus en transmission.

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