In-coating graphene nano-platelets for environmentally-friendly corrosion protection of iron. (January 2017)

• Record Type: Journal Article
• Authors: Glover, C.F.; Richards, C.; Baker, J.; Williams, G.; McMurray, H.N.
• Is Part Of: Corrosion science. Volume 114(2017)
• Page Start: 169
• Page End: 172
• Publication Date: 2017-01
• Subjects: A. Iron -- A. Polymer -- C. Atmospheric corrosion -- C. Polymer coatings; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.11.009
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: GNP-pigmented films show exceptional resistance to cathodic delamination. Oxygen-diffusion shown to be the rate-limiting step in the presence of GNPs. Delamination rates correlate with through-coating oxygen permeation rates. Abstract: A primer coating system adherent to iron substrates based on graphene nano-platelets (GNPs) dispersed in polyvinylbutyral (PVB) is presented. Using a scanning Kelvin probe (SKP), the composite coatings are shown to exhibit exceptional resistance to an important corrosion-driven failure process, namely cathodic delamination, when aqueous chloride electrolyte is introduced to a penetrating coating defect. Delamination rate kinetics are shown to correlate strongly with reductions in the rate of oxygen permeation through the coating with increasing GNP pigment volume fraction.