Heat-resistant Cr-Ni alloys due to their physical and mechanical characteristics difficult to process by traditional methods. Therefore, for processing of complex profile details using electrochemical machining These alloys are multiphase, i.e. contain other than nickel and chromium, various amounts of the alloying elements (Al, Ti, W, Co, Re, etc.), which complicates their treatment. Application of pulse treatment can improve the quality and the work surface and precision processing [1].   The pulse duration, like the pulse current exert great impact on the processing parameters [2].  The magnitude of the double layer capacitance at DC does not affect the process, but for a pulse current can significantly affect. When current flows in the cell, it first charge double layer, metal ionization is absent.  Thus, part of the energy goes into charging the double layer is not participating in the removal (ionization) of metal.  Processing conditions, when the double layer will be completely self-discharged after each pulse (long pause) can improve the accuracy processing [2]. To increase the processing speed necessary to forced discharge the double layer [2]. Polarize the electrical double layer to make sure that it would never discharge, then the voltage pulses would remove material more efficiently and at the same time, the tool would be protected from corrosion [3]. Fig. 1. Current waveform (1) and the potential (2) by treatment with a pulse current density 4A/sm² and 20 μs pulse duration (X: 5μs/div; Y: 1V/div (2), 150mA/div (1))  We have investigated dissolution heat resistant alloy EI617 in the range of current densities 1-100A/sm² apply rectangular 20 microseconds pulses whith duty cycle of 5-50% in 2M NaCl. Shown that the current efficiency for all range of dissolution conditions is 100 ± 2%, i.e. does not depend on the duty cycle and the magnitude of the current pulse. Were also carried potential measurement during dissolution Fig. 1. Seen that during the pause, potential takes a negative value (vs. silver chloride electrode) which means a full charge of the double layer. That allows making a conclusion that the proportion of energy spent on the charge of the double layer is very small and not noticeable at a given accuracy.