Authors: GaarN.P., LoktionovA.A., DavydovaS.A., IvanovaYu.S.

Title of the article: Anode behavior of armco-iron and titanium ot-4 alloys under conditions of electrochemical machining

Year: 2018, Issue: 2, Pages: 93-100

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.9.047

DOI: 10.26730/1999-4125-2018-2-93-100

Abstract: Electrochemical dimensional machining of materials is one of the varieties of electrophysical methods used in engineering. It is based on the anodic dissolution of the material under the action of electric current in a conductive environment and is used to form the surfaces of parts made of hard-working materials, including multicomponent ones. The study of the electrochemical dissolution of single-component materials will allow us not only to determine the limitation in the low productivity of the process in a multicomponent alloy but will also facilitate the search for the mechanisms for its activation. The purpose of this work is to establish the specific features of electrochemical dissolution of ARMKO-iron and titanium OT-4 in an aqueous solution of sodium nitrate with different salt concentrations.The studies were carried out by using potentiodynamic and potentiostatic methods, which are traditional in electrochemistry in establishing the character of anodic dissolution.Potentiostat-galvanostat IPC-Pro was used to scan potentials and register a steady-state current value, and a platinum reference electrode was used as a reference electrode. The range of the potentials under study was from 0 to 5 V, at a scan rate of 60 mV / s. As a result of the experimental data analysis, it was established that the titanium alloy OT-4 is not electrochemically soluble in aqueous solutions of sodium nitrate due to the formation of oxide films on the surface. Anodic dissolution of ARMCO-iron in aqueous solutions of sodium nitrate occurs at potentials above 1.7 V and is accompanied by the oxygen recovering on the surface of the material. A change in the salt concentration in electrolytes from 10% to 30% does not lead to a significant change in the anodic behavior of the material.

Key words: electrochemical dissolution titanium alloys ARMCO-iron sodium nitrate oxide films

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