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- W2054569895 abstract "The corrosion resistance of titanium and its alloys is a desirable property for many applications in materials science. In this report, the properties of the passive oxide film (TiO2) were examined by scanning electrochemical microscopy (SECM). A homemade closed-loop scanning electrochemical microscope was used to study these properties at the micrometer scale using ferrocenemethanol (Fc) as the redox mediator. The experimental results showed that the passive properties of a well-polished ASTM Grade-2 titanium (Ti-2) sample differed from region to region as indicated by the different current responses of the ultramicroelectrode (UME) on the SECM images. Selected spots with high feedback tip current were examined more closely by additional scanning. It was concluded that active spots with high positive feedback current were indicative of reactive structures located along crystalline grain boundaries, especially at the triple points. This observation is confirmed by comparing SECM results with optical micrographs reported in the literature. Previous metallographic investigations show these are the sites where the impurity iron content of the alloy congregates. This is confirmed by our experiments on scanning electron microscopy and energy dispersive X-ray analysis. For the first time, grain microstructure maps have been constructed on the SECM images, based on the above active sites. The properties of TiO2 films on Ti-2 were also assessed at various applied potentials. The reactivity of the oxide-covered Ti-2 surface increased and more active spots appeared when the Ti-2 bias potential was made more negative. This was attributed to oxide reduction (Ti(IV) to Ti(III)) and the onset of the absorption of hydrogen. The potential at which this change occurred varied at different sites on the scale of the grain structure (20−100 μm). These results demonstrate that SECM is a noninvasive analytical methodology that can provide insights into the structures and reactivities of Ti-2." @default.
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- W2054569895 date "2007-04-24" @default.
- W2054569895 modified "2023-10-14" @default.
- W2054569895 title "Insights into Grain Structures and Their Reactivity on Grade-2 Ti Alloy Surfaces by Scanning Electrochemical Microscopy" @default.
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- W2054569895 doi "https://doi.org/10.1021/cm070023d" @default.
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