Electropolishing Of Titanium Research Articles

Anodic Dissolution and Electropolishing of Titanium in an Amide-Type Ionic Liquid Containing Halide Ions

Anodic dissolution of titanium was investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethyl-sulfonyl)amide (BMPTFSA) in the presence of halide ions, Cl– and Br–. Electropolishing of Ti was possible in the presence of Cl– at 353 K, suggesting that the surface of a Ti electrode with the native oxide layer was activated by Cl–. The dissolved species of Ti after anodic dissolution of Ti at 0 V vs. Ag|Ag(I) was found to be tetravalent [TiCl6]2–, because the applied potential was more positive than the redox potential of [TiCl6]2–/[TiCl6]3–. The morphology of a Ti electrode changed after potentiostatic anodic oxidation at –0.5 V in BMPTFSA containing BMPBr, indicating that anodic dissolution of Ti was possible in the presence of Br–.

Effect of The Number of Hydroxyls and Carbons on the Solubility of Sodium Chloride in Alcohol and The Electropolishing Behavior of Ti-6Al-4V Alloy in Alcohol-Salt System

Ethylene glycol-sodium chloride (NaCl) is an environmentally friendly electrolyte in the electropolishing of titanium. To better understand the effect of the alcohol on the electropolishing of titanium, the solubility of NaCl in different alcohols and the electropolishing of titanium with different mixtures have been systematically investigated. The results reveal that the solubility of NaCl increases with the increase of hydroxyls (-OH), but decreases with the increase of carbons (C) in alkyl (-R). Moreover, the conductivity of the electrolyte increases both as the increasing of NaCl concentration and temperature, and methanol, 1,2-propanediol, and glycerol-NaCl electrolytes could be also selected as candidates for further electropolishing titanium group metals.

The electropolishing of titanium and its alloys

The electropolishing of titanium and its alloys

Electropolishing of Titanium in Perchloric Acid‐Acetic Acid Solution: II . Polarization Behavior and Stoichiometry

Anodic polarization behavior and reaction stoichiometry during electropolishing of titanium in perchloric acid‐acetic acid solution has been investigated using a rotating cylinder electrode. Formation and breakdown of anodic films result in strongly time‐dependent polarization behavior. The onset of electropolishing coincides with a current plateau in the potentiostatic polarization curve but solution side mass transfer effects are masked by the presence of a layer of reaction products. The apparent valence of dissolution in perchlorate‐containing solution is unusually low because perchlorate ion is reduced at the anode.

Electropolishing of Titanium in Perchloric Acid‐Acetic Acid Solution: I . Auger Electron Spectroscopy Study of Anodic Films

Anodic films on titanium formed in a perchloric acid‐acetic acid electropolishing electrolyte were investigated by Auger electron spectroscopy (AES) depth profile analysis. Films formed in at different potentials were used as standards for determining sputter rate and stoichiometry. Obtained results show linear film growth to occur up to the onset of electropolishing when film thickness abruptly decreases and becomes independent of potential. The electropolishing film observed by AES contains chloride ions, the concentration of which exhibits a maximum at the metal‐film interface.

Electropolishing of titanium

Electropolishing of titanium