Chemistry Characterized by XPS and Sputtered Neutral Mass Spectroscopy

INTERFACIAL CHEMISTRY CHARACTERIZED BY XPS AND SPUTTERED NEUTRAL MASS SPECTROSCOPY 

The superior corrosion performance and strong adhesion of the plasma coating system can be attributed to the coating properties and, more importantly, to the nature of interfacial chemistry. Two techniques were applied to study the surface and interfacial chemistry of the plasma coating system (1) in situ plasma deposition and XPS analysis and (2) in-depth profiling of sputtered neutral mass spectroscopy (SNMS). 

The early stage of TMS plasma deposition on an oxygen plasma-treated steel substrate shows significantly different results. No split in the Si 2p and C Is peaks at the early stage of deposition was observed. This confirmed that the plasma/steel surface interactions were very different in the two cases. Interactions with metallic state (rather than metal oxide) were stronger and resulted in stronger interfacial bonding. 

SNMS In-depth Compositional Profiling of Plasma Coating 

TMS plasma polymer coated steels were analyzed by SNMS. This analytical technique permitted obtainment of high resolution and quantitative information 

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