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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Corrosion of titanium in phosphoric acid at 250 ℃
LU Jian-shu(卢建树)

College of Chemical Engineering and Materials Science, Zhejiang University of Technology,
Hangzhou 310014, China

Abstract:Corrosion studies of a commercially pure titanium in phosphoric acid solutions at 250 ℃ were carried out by immersion test in an autoclave. At lower phosphoric acid concentration (0.1 mol/L), the corrosion was mild. At higher phosphoric concentration (1.0 mol/L) corrosion, a 25 µm-thick white corrosion products layer was formed on the samples after 24 h immersion. XRD analysis shows that the white layer consists mainly of titanium oxide phosphate hydrate (π-Ti2O(PO4)2∙2H2O). The corrosion product shows the morphology of fiber bundles. A thermodynamic analysis of the formation of the corrosion product is presented.

 

Key words: titanium; corrosion; phosphoric acid; high temperature and high pressure; corrosion mechanism

ISSN 1672-7029
CN 43-1423/U

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