Abstract
An alkoxysilyl-functionalised precursor, 1,3,5,7-tetramethyl-1,3,5,7-tetra-(2-(3-trimethoxysilyl)propylsulfanyl)ethyl-cyclotetrasiloxane was synthesized to produce protective coatings. The addition of bis-end-capped 1,2-bis(trimethoxysilyl)ethane and various alkoxysilanes led to formation of more crosslinked coatings as evidenced by 29Si NMR and IR reflection-absorption spectroscopy. The structural changes during forced anodic polarization were followed using ex situ IR reflection-absorption and in situ Raman spectroelectrochemistry. The former technique shows hydration of coatings and cleavage of some siloxane bonds. In situ Raman bands revealed decrease in intensity, while imaging enabled to follow pit formation. The potentiodynamic polarization, impedance spectroscopy and exposure in salt chamber showed that coating with hexadecyltrimethoxysilane is the most efficient.
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