Electropolishing of stainless steels in a choline chloride based ionic liquid: an electrochemical study with surface characterisation using SEM and atomic force microscopy
- 3 August 2006
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 8 (36), 4214-4221
- https://doi.org/10.1039/b607763n
Abstract
We have studied the anodic dissolution (electropolishing) of various stainless steel alloys in an ionic liquid comprising a 2 : 1 stoichiometric mix of ethylene glycol (EG) and choline chloride. We have used a combination of electrochemical and spectroscopic methods together with in situ liquid probe microscopy. We discuss the role and influence of the surface oxide passivation layer, characterized here by X-ray photoelectron spectroscopy (XPS) and linear sweep voltammetry, on the polishing process. We address the question of dealloying during the polish in order to contribute to our understanding of the viability of the ionic liquid as a replacement industrial electropolishing medium; the current commercial process uses a corrosive mixture of phosphoric and sulfuric acids. Also, we present data from ex situ and in situ liquid AFM studies giving both a qualitative and quantitative insight into the nature and scale of morphological changes at the steel surface during the polishing process.This publication has 18 references indexed in Scilit:
- Ionic Liquid Analogues Formed from Hydrated Metal SaltsChemistry – A European Journal, 2004
- Ionic Liquids Based upon Metal Halide/Substituted Quaternary Ammonium Salt MixturesInorganic Chemistry, 2004
- Ionic Liquids: Solvents for the Electrodeposition of Metals and SemiconductorsChemphyschem, 2002
- Electropolishing of Stainless Steel—a ReviewTransactions of the IMF, 2001
- Novel Ambient Temperature Ionic Liquids for Zinc and Zinc Alloy ElectrodepositionTransactions of the IMF, 2001
- Ionic Liquids—New “Solutions” for Transition Metal CatalysisAngewandte Chemie, 2000
- The Mechanism of Electropolishing of Titanium in Methanol‐Sulfuric Acid ElectrolytesJournal of the Electrochemical Society, 1998
- Fundamental aspects of electropolishingElectrochimica Acta, 1987
- Mass transfer effects in the electropolishing of metalsTransactions of the IMF, 1985
- The influence of mass transfer on the mechanism of electropolishing of nickel in aqueous sulphuric acidElectrochimica Acta, 1982