Structure of titanium-doped goethite rust

Takenori Nakayama, Tatsuo Ishikawa, Toyohiko J. Konno

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

To investigate the influence of titanium addition on the formation and structure of goethite (α-FeOOH) rust which is one of main corrosion products of weathering steel, the artificially synthesized α-FeOOH rusts were prepared by hydrolysis of aqueous solutions of Fe(III) containing Ti(IV) at different atomic ratios (Ti/Fe) in the range 0-0.1. The obtained rusts particles were observed by TEM. Characterization by XRD, N2 absorption, Mössbauer spectroscopy was also done. TEM observation revealed that the α-FeOOH rust particle size increased with the increase of Ti/Fe, and that Ti-enriched poorly crystalline particles were formed around the rust particles. XRD confirmed that the crystallite size increased with the increase of Ti/Fe, while the XRD peaks decreased in intensity. Specific surface area obtained by N2 absorption increased with the increase of Ti/Fe. It is deduced from the obtained results that the addition of Ti(IV) increases the crystallite size of α-FeOOH, and produces double domain particles consisting of the particle core and a porous poorly crystalline shell. It is thought that such unique rust structure produced by titanium addition contributes to the protective properties of rust layer of the weathering steel.

Original languageEnglish
Pages (from-to)2521-2530
Number of pages10
JournalCorrosion Science
Volume47
Issue number10
DOIs
Publication statusPublished - 2005 Oct 1
Externally publishedYes

Keywords

  • Artificial synthesized steel rusts
  • Characterization
  • Goethite
  • Mössbauer spectroscopy
  • Rust structure
  • Specific surface area
  • Titanium addition
  • Transmission electron microscopy
  • Weathering steel
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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