Collect. Czech. Chem. Commun. 1983, 48, 3495-3499

Choice of electrolyte for electrochemical machining from the point of view of intergranular corrosion

Petr Nováka, Ivo Roušara and Vladimír Číhalb

a Department of Inorganic Technology, Prague Institute of Chemical Technology, 166 28 Prague 6
b G. V. Akimov State Research Institute of Material Protection, 250 97 Prague 9


In a study of electrochemical drilling, the influence of the electrolyte composition on intergranular corrosion of various nickel alloys and of hardenable stainless steel was investigated. The nickel-base alloys did not undergo intergranular corrosion in a solution of 15% NaNO3 + 20% NaClO3 + 65% H2O, but they did so in solutions of NaNO3 alone and in solutions containing NaCl. Stainless steel did not corrode in any of the electrolyte solutions used.