Enhanced sulphidation/oxidation resistance of Ti–45Al–8Nb alloy by multilayered coatings at 850°C for up to 675 h

DUDZIAK, T., DU, H. L., DATTA, P. K., EHIASARIAN, Arutiun, REINHARD, C. and HOVSEPIAN, Papken (2014). Enhanced sulphidation/oxidation resistance of Ti–45Al–8Nb alloy by multilayered coatings at 850°C for up to 675 h. Corrosion Engineering, Science and Technology, 49 (7), 590-602.

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Official URL: http://dx.doi.org/10.1179/1743278213Y.0000000142
Link to published version:: 10.1179/1743278213Y.0000000142

Abstract

The high temperature sulphidation/oxidation behaviour of three multilayered coatings CrAlYN/CrN etched by Y+, CrAlYN/CrN etched by Cr+and CrAlYN/CrN etched CrAlzand the uncoated γ-TiAl (Ti-45Al-8Nb (at-%) used as reference sample was studied at 850°C for 675 h. Sulphidation/oxidation test was performed in the environment of H2/H2S/H2O, yielding pS2=10-1Pa and pO2=10-18Pa. Kinetic data obtained by discontinuous gravimetric method showed that the multilayered coatings effectively enhanced the sulphidation/oxidation resistance of γ-TiAl alloy. The corrosion resistance decreasing in order: CrAlYN/CrN etched by γ+>CrAlYN/CrN etched by CrAl+>CrAlYN/CrN etched by Cr+>γ-TiAl. Scale development studies using SEM, EDX and X-ray diffraction confirmed two regions of the coated materials: 'affected,' where coating cracked and developed non-protective TiO2scale, and 'unaffected,' where protective (Al, Cr)2O3scale formed. The uncoated γ-TiAl material, after exposure, showed a typical multilayered structure consisting of layers of TiO2and Al2O3.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Identification Number: 10.1179/1743278213Y.0000000142
Depositing User: Hilary Ridgway
Date Deposited: 25 Sep 2014 09:22
Last Modified: 25 Sep 2014 09:22
URI: http://shura.shu.ac.uk/id/eprint/8481

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