Formation of alumina-aluminide coatings on ferritic-martensitic T91 steel
In this work, alumina-aluminide coatings were formed on ferritic-martensitic T91 steel substrate. First, coatings of aluminum were deposited electrochemically on T91 steel in a room temperature AlCl3-1-ethyl-3-methyl imidazolium chloride ionic liquid, then the obtained coating was subjected...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2014-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2014/1450-53391400022C.pdf |
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| Summary: | In this work, alumina-aluminide coatings were formed on ferritic-martensitic
T91 steel substrate. First, coatings of aluminum were deposited
electrochemically on T91 steel in a room temperature AlCl3-1-ethyl-3-methyl
imidazolium chloride ionic liquid, then the obtained coating was subjected to
a two stage heat treatment procedure consisting of prolonged heat treatment
of the sample in vacuum at 300 ○C followed by oxidative heat treatment in air
at 650 ○C for 16 hours. X-ray diffraction measurement of the oxidatively heat
treated samples indicated formation of Fe-Al and Cr-Al intermetallics and
presence of amorphous alumina. Energy dispersive X-ray spectroscopy
measurement confirmed 50 wt- % O in the oxidized coating. Microscratch
adhesion test conducted on alumina-aluminide coating formed on T91 steel
substrate showed no major adhesive detachment up to 20 N loads. However,
adhesive failure was observed at a few discrete points on the coating along
the scratch track. |
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| ISSN: | 1450-5339 |