In-situ laser cladding of Al2O3reaction coating on aluminium alloy 7075 for corrosion resistance improvement

Tai Man Yue, K. J. Huang, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

The microstructure und corrosion behaviour of the thermite reaction coatings for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, and AlTiO2-SiO2that 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-Al2O3and γ-Al2O3phases 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-SiO2system, 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-SiO2system is attributed to galvanic corrosion occurred between the reduced metal, the intermetallic compounds and aluminium.
Original languageEnglish
Pages (from-to)948-951
Number of pages4
JournalMaterials Transactions
Volume47
Issue number3
DOIs
Publication statusPublished - 1 Mar 2006

Keywords

  • Aluminium alloy
  • Corrosion
  • Laser cladding
  • Thermite reaction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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