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Abstract
The polyaniline emeraldine salt of para-toluenesulphonic acid (PAni-PTS) is dispersed in polyvinylbutyral (PVB) coatings adherent to a zinc surface. Such dispersions are shown to effectively inhibit corrosion-driven (cathodic) coating delamination when aqueous chloride electrolyte contacts a penetrative coating defect. A scanning Kelvin probe (SKP) is used to determine the influence of PAni-PTS volume fraction ( φ pa) on both delamination kinetics and the potential of the intact (undelaminated) coated surface ( E intact). At relative humidities (rh) of ca. 95% no delamination is observed over a 48 h period when φ pa⩾0.2. However, ennoblement of E intact does not persist for longer than 6 h at the same rh. Over a similar period (6 h) a zinc oxide layer develops at the coating-metal interface and attains a thickness proportional to φ pa. An inhibition mechanism is proposed in which the PAni-PTS induced zinc oxide layer stifles cathodic O 2 reduction and is itself protected from alkaline dissolution through PAni-PTS mediated pH buffering.
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