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

被引：2
作者：
Dudziak, T. [1 ]
Du, H. L. [2 ]
Datta, P. K. [2 ]
Ehiasarian, A. P. [3 ]
Reinhard, C. [3 ]
Hovsepian, P. Eh [3 ]
机构：
[1] Foundry Res Inst, PL-30418 Krakow, Poland
[2] Northumbria Univ, Sch Comp Engn & Informat Sci, Adv Mat Res Inst, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
[3] Sheffield Hallam Univ, Nanotechnol Ctr PVD Res, Mat & Engn Res Inst, Sheffield S1 1WB, S Yorkshire, England
来源：
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY | 2014年 / 49卷 / 07期
关键词：
Multilayered coating; Sulphidation; Oxidation; gamma-TiAl; High temperature corrosion; OXIDATION BEHAVIOR;
D O I：
10.1179/1743278213Y.0000000142
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The high temperature sulphidation/oxidation behaviour of three multilayered coatings CrAlYN/CrN etched by Y+, CrAlYN/CrN etched by Cr+ and CrAlYN/CrN etched CrAl+ and the uncoated gamma-TiAl (Ti-45Al-8Nb (at-%) used as reference sample was studied at 850 degrees C for 675 h. Sulphidation/oxidation test was performed in the environment of H2/H2S/H2O, yielding pS(2)=10(-1) Pa and pO(2)=10(-18) Pa. Kinetic data obtained by discontinuous gravimetric method showed that the multilayered coatings effectively enhanced the sulphidation/oxidation resistance of gamma-TiAl alloy. The corrosion resistance decreasing in order: CrAlYN/CrN etched by Y+>CrAlYN/CrN etched by CrAl+>CrAlYN/CrN etched by Cr+>gamma-TiAl. Scale development studies using SEM, EDX and Xray diffraction confirmed two regions of the coated materials: 'affected,' where coating cracked and developed non-protective TiO2 scale, and 'unaffected,' where protective (Al, Cr)(2)O-3 scale formed. The uncoated gamma-TiAl material, after exposure, showed a typical multilayered structure consisting of layers of TiO2 and Al2O3.
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收藏
页码：590 / 602
页数：13
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