Corrosion of Ti-2 and Ti-7 relevant to nickel acid leach chemistry

Vaughan, J, Reid, P and Alfantazi, A (2010) Corrosion of Ti-2 and Ti-7 relevant to nickel acid leach chemistry. Hydrometallurgy, 101 3-4: 156-165. doi:10.1016/j.hydromet.2009.12.011

Author Vaughan, J
Reid, P
Alfantazi, A
Title Corrosion of Ti-2 and Ti-7 relevant to nickel acid leach chemistry
Journal name Hydrometallurgy   Check publisher's open access policy
ISSN 0304-386X
Publication date 2010-03
Sub-type Article (original research)
DOI 10.1016/j.hydromet.2009.12.011
Volume 101
Issue 3-4
Start page 156
End page 165
Total pages 10
Editor D. Muir
J. Petersen
N.J. Welham
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2011
Language eng
Formatted abstract
The corrosion of commercially pure unalloyed titanium (Ti-2) and titanium with 0.15 wt.% palladium (Ti-7) was studied in acid sulphate solutions with and without chlorides. Both immersion testing and electrochemical techniques were used to characterize the corrosion. Corrosion rates calculated from polarization experiments were related to maximum rates observed during immersion testing; the two values generally agreed within an order of magnitude. The palladium alloyed metal showed corrosion resistance superior to Ti-2. The presence of chlorides enhanced the corrosion, especially of the palladium alloy indicating that palladium was dissolving as a chloro-complex. Corrosion was initiated by pitting near the grain boundary. The final corrosion morphology of the two metals differed significantly. Corroded Ti-2 exhibited a rough morphology with preferential dissolution of the grain material while Ti-7 showed a smooth, bubbly surface when corroded with strong acid and chlorides. The samples were thoroughly characterized.
© 2010 Elsevier B.V. All rights reserved.
Keyword Titanium alloy
Electrochemical polarization
Immersion test
High pressure acid leaching
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 18 Apr 2010, 00:05:09 EST