Abstract
Electropolishing of bronze was investigated in this work in an electrolyte based on a deep eutectic solvent, Ethaline (a eutectic mixture of choline chloride and ethylene glycol in a 1:2 M ratio, respectively). Two kinds of bronzes were used: AMPCO® 22 alloy (containing Al and Fe as alloying components) and AMPCO® 712 alloy (containing Sn, Ni, Pb and Zn as alloying components). Electrochemical responses of bronze in Ethaline were studied by cyclic voltammetry technique. It was established that the electropolishing of both bronzes can be performed at the temperature of 25 °C and anode electrode potential of 2.5 V (vs. Ag pseudo-reference electrode). The surface leveling and dissolution of microdefects were confirmed by atomic force microscopy and scanning electron microscopy. The electrochemical polishing of the surfaces of AMPCO® 22 and AMPCO® 712 bronzes was shown to result in an improvement in their corrosion resistance. Electrolytes based on deep eutectic solvents seem to be a promising replacement for traditional corrosive and environmentally hazardous acid aqueous solutions for electropolishing of copper alloys.
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