EPT (Electro-Polishing Treatment) is a surface treatment technology that simultaneously achieves smoothing, brightening, deburring, descaling, and passivation of metal surfaces by electrochemically dissolving them in an electrolyte solution. It can remove fine irregularities and internal stresses that are difficult to address with mechanical polishing, and is widely used in fields requiring high cleanliness and corrosion resistance. Primary applications include medical devices, semiconductor manufacturing equipment components, food and pharmaceutical plant components, and vacuum components. The process involves making the workpiece the anode and passing a direct current through it in an electrolyte solution. The type of electrolyte, current density, and treatment time significantly affect the final finish.