Electrode wire for electric spark discharge machining and preparation method thereof

The invention discloses an electrode wire for wire cut electrical discharge machining and a preparation method thereof.The electrode wire comprises a brass core material and further comprises a copper-zinc alloy layer and a surface layer which are arranged outside the brass core material, the surface layer is distributed on the surface of the copper-zinc alloy layer in a sheet shape or a particle shape, and the exposed copper-zinc alloy layer is arranged in gaps between the sheet shape or the particle shape of the surface layer. A plurality of micropores are distributed in the surface layer and at the interface of the surface layer and the copper-zinc alloy layer, and the size of the micropores in the surface layer is smaller than that of the micropores at the interface of the surface layer and the copper-zinc alloy layer. In the preparation process, a zinc coating is electroplated on the surface of a brass core material, a saccharide organic matter additive is added into an electroplating solution, and a fin