INFLUENCE OF SODIUM SACCHARINATE ON THE INTERNAL STRESSES OF NICKEL OBTAINED BY ELECTROEXTRACTION FROM METHANE SULFONATE LEACH SOLUTION

Abstract

The processing of heat-resistant alloys is an important stage in the production of strategically important materials. Nickel superalloys, which are used in the manufacture of aircraft turbine elements, play a special role in the defense industry. The dissolution of alloy components is usually carried out in an acidic environment, after which individual components are gradually removed from the resulting solution. To obtain metals of high purity, one of the most effective approaches is electroextraction from a leaching solution. Methanesulfonate solutions are considered a promising reagent for leaching, characterized by high solubility of salts of heat-resistant alloy components. When nickel is extracted from leaching solutions by the electroextraction method, metal precipitates with significant internal tensile stresses are formed. To reduce these stresses, sulfur-containing modifiers of nickel properties, in particular sodium saccharinate, are used. The work investigated the effect of sodium saccharinate on the internal stresses of nickel obtained by electroextraction from methanesulfonate leaching solution. It was found that with an increase in the concentration of sodium saccharinate tau from 0.95 to 2.5 mmol/l, the internal stresses of nickel decrease with a transition to internal compressive stresses. An increase in the current density reduces the effect of sodium saccharinate on the properties of nickel and the internal tensile stresses increase. When the electrolysis temperature decreases from 333 °K to 313 °K, a greater dependence of internal stresses on current density is observed. Comparison of data on the effect of sodium saccharinate on the internal stresses of nickel obtained from methanesulfonate and sulfate solutions showed that the methanesulfonate solution has significant advantages. This is due to the possibility of obtaining nickel with minimal internal stresses in a wide range of current densities.