The paper investigates the characteristic features of the selective dissolution of the silver-alloyed magnesium alloy NZ30K in Ringer-Locke solution. It was found that it dissolved selectively. It was found that a characteristic feature of this process was the enrichment of the alloy surface with Mg and the depletion of Zn, Zr, Nd, and Ag. Under such conditions, the solid-phase diffusion of Zn, Zr, Nd, and Ag atoms was directed to the alloy surface and Mg atoms to its volume. It was found that Zn dissolved more slowly from the alloy surface than Zr, Nd, and Ag. This contributed to the formation of a passive film on its surface, which mainly consisted of Zn oxides. They have high resistance to the activating effects of chloride ions, which are also present in the Ringer-Locke solution, and protect the alloy from pitting corrosion. Etched inclusions of rectangular and acute-angled intermetallics with a size of about 50 microns were recorded on the surface of the alloy under study. They were the center of origin of metastable pittings, which caused the inclusions to be etched from the alloy solid solution and repassivated. This is confirmed by the nature of selective alloy dissolution in these areas. In particular, a complex microrelief of the surface with pores was recorded here, which is inherent in the selective dissolution of metals in the anode areas. It is shown that it is formed as a result of its enrichment with Ag or Zr and depletion of Mg, Nd, Zr, or Nd, Mg, Zn and Ag. Under such conditions, solid-phase diffusion of Mg, Zn, Nd, Zr, or Nd, Mg, Zn, and Ag atoms to the alloy surface and Ag or Zn- atoms into its volume is possible. It was hypothesized that the solid-phase diffusion of Mg atoms to the alloy surface caused the formation of pores due to the coagulation of nonequilibrium vacancies. However, the slow ionization of Zn atoms on the surface of the alloy under the intermetallic inclusions etched from it contributed to the solid-phase diffusion of Zn atoms to its surface and the formation of Zn-containing oxide films. This selective dissolution of metals in the pittings facilitates their repassivation. And the uniform corrosion dissolution of the Ag-alloyed NZ30K alloy makes it possible to recommend it for the production of biodegradable implants in the treatment of broken bones.