Synthesis and characterisation of pack cemented aluminide coatings on metals

The exposition of metallic materials to high temperature environments leads to their corrosion because of oxidation or sulphidation. One way to protect such materials is to produce an Al2O3 layer which needs to be continuous enough to limit diffusion of oxygen or metallic elements, and withstand thi...

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Bibliographic Details
Published inApplied surface science Vol. 236; no. 1-4; pp. 256 - 269
Main Authors HOUNGNINOU, C, CHEVALIER, S, LARPIN, J. P
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Science 15.09.2004
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Physics
Scanning electron microscopy
Surface modification
Oxygen
Inorganic compounds
Surface treatments
Iron
X-ray spectra
Aluminium
XRD
Dispersive spectrometry
Molybdenum
Thickness
Metal coating
Corrosion
Transition elements
Pack cementation process
Nickel
Oxidation
Coating
Diffusion
Cross sections
Aluminide compounds
Aluminium oxides
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Summary:The exposition of metallic materials to high temperature environments leads to their corrosion because of oxidation or sulphidation. One way to protect such materials is to produce an Al2O3 layer which needs to be continuous enough to limit diffusion of oxygen or metallic elements, and withstand this corrosion. Since a few years, it has been proved that aluminide compounds are one of the most effective materials to achieve this goal. Indeed, they possess sufficient Al and many beneficial mechanical properties when exposed to high temperature conditions to make possible the formation of a protective Al2O3 scale. This study is aimed at the elaboration of iron, nickel and molybdenum aluminides by modification of the surface of the base materials by a pack cementation process. The as-cemented alloys were analysed by means of SEM coupled with EDX and by XRD. Cross-section examinations showed, in each case, a progressive diffusion of aluminium through the substrates. The diffusion thickness layer was more or less important depending on the base material and on the coating conditions. (Substrates: Fe-30Cr, Fe, Ni, Mo.)
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2004.04.026