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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 46,
  • Issue 9,
  • pp. 1412-1419
  • (1992)

Characterization of Conversion-Coated Aluminum Using Fourier Transform Infrared and Raman Spectroscopies

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Abstract

Fourier transform infrared and Raman spectroscopies have been employed to define the molecular composition of chromium phosphate conversion coatings on aluminum. Attenuated total reflectance at 55° can be employed to probe the structure of conversion coatings present on aluminum at relatively high coating weights (≥23 mg Cr/m<sup>2</sup>). Both reflection-absorption infrared and surface-enhanced Raman spectroscopic techniques can discern the presence of conversion coatings at coverages as low as 9 mg Cr/m<sup>2</sup>. On the basis of the vibrational spectra from these techniques, we have determined that hydrated chromium phosphate is the major component in these conversion coatings on aluminum. Reflection-absorption infrared and surface-enhanced Raman spectroscopies also provide a means to determine the molecular structure of the nascent oxide layer on aluminum as a function of processing conditions. Specular reflection, attenuated total reflectance at 35°, diffuse reflectance, and Raman spectroscopic methods, in general, lack the surface sensitivity necessary to probe thin (≤ 23 mg/m<sup>2</sup>) inorganic films on aluminum.

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