| Résumé : |
Coatings are heterogeneous materials consisting of pigments, resins, additives etc., and are quite complex in nature. Many smooth, highly specular coatings, such as automotive paints and appliance coatings, are subjected to considerable performance demands and manufacturers spend significant sums each year to monitor and repair coatings surface quality. Additionally, changing product specifications and environmental regulations will continue to affect the processing parameters that influence surface appearance and quality. Therefore, it is vital to develop robust methods to monitor surface quality. A full characterization of amorphous or nanostructured coatings at the microstructural level has some intrinsic difficulties associated with the lack of long range order and reference compounds, which often make their study difficult. Only by the combination of different characterization techniques it is possible in many cases to achieve valuable chemical and structural information. In this paper, the relevant measuring techniques are discussed using typical examples reflecting the current status of application in coating industry and different methods used to illustrate how the combination of characterization techniques, as TEM associated to ED or EELS, SEM, XPS, RBS, GC-MS, RBS , GC-MS, FTIR, IR microscope with ATR, XRF, TOFSIMS, ICP and XRD and some other methods which are determinant to correlate microstructure with deposition parameters and properties in such complex systems. Each method has its own advantages and limitations which need to be taken into consideration while selecting a particular method for analysis. |
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Characterization techniques - Applications in paints & coatings in PAINTINDIA, Vol. LX, N° 8 (08/2010)
