Microscopic observations of the surface structure and composition of thin films of silver-gold alloys are used to deduce the processes involved in the dissolution of these alloys in nitric acid solutions. The micromorphology consists of an island-and-channel structure whose formation depends in detail on the initial overall composition of the alloy. The micromorphology can be modified by annealing for short times at elevated temperature, by storage for long periods at room temperature, or by increasing the strength of the acid during corrosion, giving very similar results. These observations can be explained in terms of a model in which corrosion proceeds by selective dissolution of the less noble component, thereby creating a disordered surface layer which subsequently reorders by surface diffusion.
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Forty et al. (1980) studied this question.
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