Abstract
This paper describes a high resolution optical and electrochemical study into how metallic tin acts to reduce the rate of filiform corrosion (FFC) initiation and propagation on tin and iron-tin intermetallic (Fe-Sn IM) coatings for packaging steels. The time-dependent extent of FFC was determined optically using time lapse photography and by repeated in-situ scanning using a scanning Kelvin probe (SKP) apparatus. FFC was not observed on tin coatings but was found to propagate at a significantly reduced rate on the Fe-Sn IM when compared to pure iron. A rotating disk electrode (RDE) technique was subsequently used. O2 reduction currents were low on both pure tin and tin coatings when compared to pure iron, intermediate values being obtained for the Fe-Sn IM. It is concluded that the rate of FFC is related to the overpotential for the oxygen reduction reaction (ORR).
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