Different techniques for determining the coating weight of phosphate layers on galvanized steel by FTIR-spectrometry.
The detn. of the wt. per unit area (\"coating wt.\") of phosphate layers on galvanized steel by means of FT-IR-spectrometry has been performed by three different techniques: (i) principal component regression (PCR) of absorption data, (ii) utilizing the thickness dependent wavenumber shift of a band due to a special optical surface effect obsd. with parallel-polarized radiation and (iii) of an interference band obsd. with perpendicular-polarized radiation.
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