Abstract
Electrochemical scanning tunneling microscopy is proved to be a powerful tool for providing valuable topographic information to study in situ the local corrosion properties of polycrystalline materials. It was applied to analyze the susceptibility to intergranular corrosion of different types of grain boundaries of microcrystalline copper in HCl and combined with electron backscatter diffraction to link the observed corrosion differences to a specific type of grain boundary. The superior resistance to intergranular corrosion of coherent twin boundaries over random grain boundaries is demonstrated.
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