Scanning tunneling microscopy (STM) combined with conventional electrochemical techniques was used to determine the kinetics and mechanism of beta-brass dealloying in aqueous neutral solutions containing NaCl. In the potential range where selective dissolution of Zn occurs, electrochemical data suggest that the corrosion process is controlled by surface diffusion of Cu atoms. STM imaging of beta-brass after dealloying shows the development of an irregular surface which attains a stationary regime. The irregular surface topography consists of faceted islands with atomically smooth terraces. For a constant dealloying time, the extent of faceting increases as the potential is moved positively, and at a constant applied potential it increases with electrodissolution time. The proportionality xi proportional to L(alpha) was established, where xi is the interface width related to L, the sample size. The exponent alpha is related to the degree of surface disorder. The value of or derived from STM is in the range 0.7 less than or equal to alpha less than or equal to 0.8, i.e. close to the predictions of aggregation models including surface diffusion.