In previous works, we have proposed an electrochemical machining (ECM) method using a kind of porous solid, which can be called Maifan stone ball (MFS-ball), as the electrolyte absorbing material. The experimental results show that the porous solid can control the distribution of electrolytes effectively during machining, and the electrochemical reactions only occur in the area covered by electrolytes. In addition, through follow-up experiments, we found out the influence of different experimental conditions on the experiment results. However, there are still some unclear points about the mechanism of this ECM method. Therefore, in this study, basing on experimental results and analysis, we tried to elucidate the machining mechanism of the ECM through electrolyte absorbed with the MFS-ball.
