The use of high-resolution XPS and ToF-SIMS to investigate segregation phenomena of minor components of a model coil coating formulation
✍ Scribed by Leadley, S. R.; Watts, J. F.; Blomfield, C. J.; Lowe, C.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 273 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
The segregation of minor componentsÈa melamine-formaldehyde resin and a poly(acrylic) Ñow control agentÈin a model epoxy resin coil coating applied to hot-dipped galvanized steel has been investigated by high-resolution XPS and time-of-Ñight SIMS (ToF-SIMS). It is shown that by using the highest resolution monochromated XPS currently available, the C 1s spectrum can be peak Ðtted to account for all eleven carbon functionalities present in the three components of the organic coating. A ToF-SIMS analysis of the melamine-formaldehyde resin has been undertaken and a comprehensive ion fragmentation scheme for the positive ion spectrum of this molecule in the range 0-500 Da is proposed. It is shown, by both surface analytical techniques, that when the Ñow control agent is excluded from the formulation the surface of the paint Ðlm is enriched in the melamine-formaldehyde component. On addition of the Ñow control agent such segregation is only identiÐed by XPS ; the ToF-SIMS spectrum resembles that of the Ñow control agent. This is taken to be an indication of monolayer segregation of this component at the paint/air interface. Such segregation phenomena are shown to be insensitive to substrate surface pretreatment.