Abstract
Electropolishing of metal surfaces is a benign alternative to mechanical treatment. Ionic liquids are considered as green electrolytes for the electropolishing of metals. They demonstrate a number of advantages in comparison with acid aqueous solutions and other methods of producing smooth or mirror-like surfaces that are required by diverse applications (medical instruments, special equipment, implants and prostheses, etc.). A wide window of electrochemical stability, recyclability, stability and tunability are just a few benefits provided by ionic liquids in the title application. An overview of the literature data on electropolishing of such metals as Ti, Ni, Pt, Cu, Al, U, Sn, Ag, Nb, stainless steel and other alloys in ionic liquids is presented.
Highlights
Anodic treatment is one of the most effective methods used in the finishing of metals and alloys to achieve a mirror-like state of the metal surface
The dissolution of the oxide film of stainless steel in ionic liquids [9] (IL) brings about pitting rather than the polishing observed at a higher current density
The surface of the alloy after electropolishing for 6–8 min in IL found by EDX and atomic force microscopy (AFM) techniques was shown to be insignificantly depleted in Al and V
Summary
Anodic treatment is one of the most effective methods used in the finishing of metals and alloys to achieve a mirror-like state of the metal surface. The result of this process depends on a number of factors, including the properties and composition of metal and electrolyte, temperature, voltage, current density, time, and others [1,2,3,4,5,6,7]. This work is aimed at the overview of recent investigations summarizing challenges and conditions of the employment of the ionic liquids based on organic cations in the electrochemical polishing of metals and alloys
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