Blown soybean oil ceramer coatings for corrosion protection

A series of ceramer coatings were formulated using blown soybean oil as the organic phase, and sol-gel precursors [titanium(iv) isopropoxide, titanium(iv) diisopropoxide bisacetoacetonate, and zirconium propoxide] as the inorganic phase. The corrosion resistance of the ceramer coatings was evaluated using failure-at-scribe and electrochemical impedance spectroscopy (EIS) on aluminium after exposure in a Prohesion Chamber. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA) were also used to evaluate the coatings after exposure. The ceramer coatings demonstrated higher pull-off adhesion, impedance modulus (after exposure), and lower failure-at-scribe than the blown soybean oil film. It was surmised that the addition of sol-gel precursor enhanced the corrosion protective properties of the ceramer coatings via a self-assembling layer of metal-oxo clusters at the film substrate (aluminium) interface.