[en] Investigated are the causes of film formation obtained from dissolution products and high surface roughnesss during electrochemical machining of titanium alloys. Titanium acid is stated to be the product of film formation. A method for the films removal is suggested

[en] By the method of electron diffraction analysis studied was the phase composition of films arizing in the process of electrochemical perforation of nickel, molybdenum, aluminium and titanium foils in electrolytes on the basis of NaCl, NaNO₃, Na₂HPO₄, NaNO₂, KBr and KI at the room temperature. It is found out that the surface films in the process of electrochemical treatment under the above conditions do not include components able to increase the self discharge of the chemical current source

[en] Alteration of anode potential under conditions, simulating electrochemical hole drilling in the VT5 and VT6 titanium alloys has been experimentally investigated. It is established, that the length of surface etching zones with low current density (2-4 A/cm²) is 5-6 times higher than the interelectrode clearance, which is one of the reasons for a rather low accuracy and quality of surface in the case of hole drilling in titanium alloys. The conclusion is made, that hole calibration with stationary electrode-tool is advisable. It is shown that shaping of long-dimension details is connected with potential distribution over the treated surface. More homogenious surface is achieved in electrolytes under conditions, providing for alloy solution in a transpassive state