干式电火花加工表面耐腐蚀性探索性研究

he aim of this paper is preliminary studying on the surface erosion resistance of electrical discharge in gas (dry EDM). Hydrochloric acid (HCl), sodium hydroxide (NaOH) with 20% volumetric concentration and analogue saline water were used as erosion dielectric in experiments, and the surface erosion resistance of the samples ED-Machined (EDMed) in kerosene and air were experimentally studied. Experimental results show that, on the finish gauge, in HCl solution, the surface erosion resistance of dry EDM is weaker than the samples processed in kerosene, and in NaOH solution, the surface erosion resistance of dry EDM is better than that the samples processed in oil. In the analogue saline water experiment, kinetic electric potential scanning polarization curve method was used, and the polarization cure testing results indicate that, on the rough gauge, the surface of sample processed in air own better erosion resistance to analogue saline water; while, on the finish gauge, the dry-EDMed surface erosion resistance weaker than that of wet EDM.