High temperature corrosion of titanium under conditions relevant to pressure leaching: Mass loss and electrochemistry

Jing Liu, Akram Alfantazi, Edouard Asselin

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The corrosion behavior of titanium was studied using mass loss and electrochemical measurements in sulfuric acid with Cl-, Cu2+, and Fe3+ additions up to 175°C. The corrosion rate of titanium in 30 g L-1 H2SO4 + 12 g L-1 Cl- solution at 150°C measured by mass loss was higher than 62 mm y-1. The corrosion rates of titanium under simulated pressure-leaching conditions determined by both mass loss and polarization resistance measurements were consistent, and also suggest that Cu2+ and Fe3+ ions are excellent corrosion inhibitors for titanium. Results from mass loss and electrochemical measurements all confirmed that the corrosion rate of titanium decreased remarkably with the addition of 1 g L-1 Fe3+ to the leaching solution at 150°C, and that the presence of Fe3+ is the most important factor for the growth of titanium oxide films under pressure-leaching conditions. In addition, iso-corrosion diagrams, with 0.1, 0.5, and 1 mm y-1 lines for titanium in H2SO4 solutions from room temperature to 175°C, were constructed from mass loss data.

Original languageBritish English
Pages (from-to)352-366
Number of pages15
JournalCorrosion
Volume71
Issue number3
DOIs
StatePublished - 1 Mar 2015

Keywords

  • Corrosion rate
  • Mass loss
  • Polarization resistance
  • Pressure leaching
  • Sulfuric acid
  • Titanium

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