ELECTROCHEMICAL ALLOYS BASED ON IRON FAMILY METALS: THE EFFECT OF ELECTROLYSIS CONDITIONS
DOI:
https://doi.org/10.15421/jchemtech.v32i4.310727Keywords:
alloys; refractory metals; cobalt; pulse mode; current efficiency; electrolyte solution.Abstract
One of the main tasks of process chemists and material scientists is to create polyfunctional materials with a high level of specified properties. Controlling the structure and composition by varying the electrolysis parameters allows us to produce coatings with unique characteristics. Cobalt coatings have high hardness, corrosion resistance, reflectivity and magnetic properties. The additional inclusion of refractory components in the composition of coatings is one of the most promising ways to control their functional properties, and hence the scope of application, due to the unique physicochemical and physicomechanical properties of such alloys. The process of forming ternary Co-Ni-Zr alloys in the pulse mode from a citrate electrolyte on a copper substrate has been investigated. The effect of stirring, electrolyte pH and current density on the composition, surface morphology and current efficiency of ternary cobalt electrolytic alloys was studied. The resulting coatings are characterised by a uniform surface without cracks. The use of the pulse mode with the ratio of pulse duration 1×10-3–20×10-3 s and pause duration 2×10-3–20×10-3 s and the amplitude of cathodic current density 1–10 A/dm2 makes it possible to obtain cobalt-based alloys with zirconium content up to 2 wt. %. It was found that an increase in the acidity of the electrolyte solution does not favourably affect the current efficiency, and the dependence of the zirconium content is extreme. The modes of electrosynthesis of coatings with cobalt-nickel-zirconium alloys with a given level of surface development are substantiated.
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