Structure and Transport in Coatings from Multiscale Computed Tomography of Coatings—New Perspectives for Eelectrochemical Impedance Spectroscopy Modeling?

摘要: Abstract Computed Tomography (CT) is an approach that has been extensively applied in many areas of science from understanding structures living organisms to materials science. In science, the study within coatings presents challenges on at least two different levels. First, structure needs be understood atomic scale, where dissolution reactions begin, up length scales which cover aggregation inhibitors and other additives, take place ∼10 −5  m, i.e. 4 5 orders magnitude. CT a favourable imaging technique since it allows multiscale information obtained non-destructively down tens nanometres. this X-ray absorption contrast used examine created using strontium chromate (SrCrO ) particles embedded epoxy film. It found SrCrO can form clusters extend few hundred microns plane film, span thickness film have fractal characteristics. There are also volumes low density similar sizes characteristics clusters. The strong influence leaching behaviour release changes with time. Initially, controlled by direct but, as dissolve, dominated dimension cluster. dissolved leave behind voids filled electrolyte provide alternative transport pathways for corrosive ions through polymer. paper, nature these will reviewed implication properties electrochemical assessment explored.