Abstract
The mechanism during electropolishing of NiTi in methanolic 3 M sulfuric acid is elucidated based on the investigations carried out using a rotating disc electrode (RDE). The influence of the rotation rate, temperature and the addition of Ni and Ti ions in solution on the dissolution kinetics are investigated and analysed. The dissolution of NiTi during electropolishing exhibits Levich behaviour confirming mass transport as the rate-limiting step. The temperature dependence shows a typical Arrhenius behaviour and the activation energy for dissolution is Ea = 19.2 (±1.33) kJ mol-1. The addition of metal ions to the electropolishing solution results in a lower limiting current density for both, Ni2+ and Ti4+ addition. This confirms the mass transport of dissolved species from the anode surface to the bulk of the solution as the rate-determining step.
| Original language | English |
|---|---|
| Pages (from-to) | 915-919 |
| Number of pages | 5 |
| Journal | Electrochimica Acta |
| Volume | 53 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 01 Dec 2007 |
Fields of science
- 104005 Electrochemistry
- 104006 Solid state chemistry
- 104014 Surface chemistry
- 104017 Physical chemistry
- 105113 Crystallography
- 105116 Mineralogy
- 503013 Subject didactics of natural sciences
- 204 Chemical Process Engineering
- 204001 Inorganic chemical technology
- 205016 Materials testing
- 210006 Nanotechnology
- 211104 Metallurgy
JKU Focus areas
- Engineering and Natural Sciences (in general)
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