Determining the molecular composition of modified aluminum surfaces using vibrational spectroscopies

Angela M. Ahern

doi:10.1117/12.59329

1 May 1992 Determining the molecular compsition of modified aluminim surfaces using vibrational spectroscopies

Angela M. Ahern

Proceedings Volume 1637, Environmental and Process Monitoring Technologies; (1992) https://doi.org/10.1117/12.59329
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

The surface of aluminum alloy sheet often is chemically modified to promote wetting, corrosion resistance, and adhesion of polymeric coatings. A detailed description of the molecular composition of such pretreated surfaces usually is unknown, although this knowledge is vital in designing better surfaces. Both reflection-absorption infrared spectroscopy (RAIRS) and surface-enhanced Raman spectroscopy (SERS) have been employed to charscterize thin (few tens of angstroms) films on aluminum. The results from these studies on chromate-phosphate coatings (chromium phosphate conversion coatings) and phosphonic acid anodized layers on aluminum have provided a me detailed understanding of the structure of these engineered surfaces. The nature of interaction between the pretreatment species and the aluminum substrate has been determined, and a possible orientation of these species with respect to the substrate is suggested. The strengths and limitations of both techniques will be discussed within the confines of investigating rough aluminum surfaces.

Citation Download Citation

Angela M. Ahern "Determining the molecular compsition of modified aluminim surfaces using vibrational spectroscopies", Proc. SPIE 1637, Environmental and Process Monitoring Technologies, (1 May 1992); https://doi.org/10.1117/12.59329

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