Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23632
Title: In-situ laser cladding of Al2O3 reaction coating on aluminium alloy 7075 for corrosion resistance improvement
Authors: Yue, TM 
Huang, KJ
Man, HC 
Keywords: Aluminium alloy
Corrosion
Laser cladding
Thermite reaction
Issue Date: 2006
Source: Materials transactions, 2006, v. 47, no. 3, p. 948-951 How to cite?
Journal: Materials Transactions 
Abstract: The microstructure und corrosion behaviour of the thermite reaction coatings for the systems of Al-CuO-SiO2, Al-Cr2O 3-SiO2, and AlTiO2-SiO2 that produced by laser cladding on aluminium alloy 7075 have been studied. The results of the XRD analysis show that in all the three reaction coatings, α-Al2O3 and γ-Al2O3 phases were present together with various intermetallic phases and the corresponding reduced metal. A comparison of the polarisation curves of the untreated and the various coated specimens shows that except for the Al-CuO-SiO2 system, the corrosion current density of the coated specimens was one order of magnitude lower than that of the untreated specimen, also a higher corrosion potential was obtained. The inferior corrosion resistance of the Al-CuO-SiO2 system is attributed to galvanic corrosion occurred between the reduced metal, the intermetallic compounds and aluminium.
URI: http://hdl.handle.net/10397/23632
ISSN: 1345-9678
DOI: 10.2320/matertrans.47.948
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