Dual-conversion selective dissolution of single crystal superalloy by using a fixed electrolyte

Abstract

Selective dissolution of multiphase alloys can obtain porous structures. Normally, in a given electrolyte, the active phase will be dissolved and thus constructing complex structures requires varying the electrolyte. In this work, we break through this limit and realize a dual-conversion selective dissolution of single crystal superalloy in the transpassive region in a same electrolyte by adjusting applied potential, and two types of nanostructures, grid-like and columnar structures, are constructed. The underlying mechanism for the preferential dissolution of γ/γ′ phases is discussed. Our results provide a convenient means for the flexible and controllable preparation of large-scale nanostructures on multiphases alloys.