Effect of laser formed AlN/Al2O3 films on corrosion behaviour of aluminium alloy 6013

W. L. Xu, Tai Man Yue, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Excimer laser surface melting (LSM) was conducted on aluminium alloy 6013 with the aim of ascertaining the significance of the laser formed nitride/oxide film in providing a corrosion barrier to the alloy. Laser surface melting was performed under two different gas environments, nitrogen and air. After the laser treatment, a compact AlN and Al2O3 mixed film was formed at the top surface of the N2treated specimens, while only Al2O3 phase was found in the film of the air treated specimens. The laser formed film of some specimens was removed using ion etching, and their corrosion behaviour was studied. The potentiodynamic polarisation measurements showed that without ion etching, the corrosion current densities of the N2 treated and the air treated specimens were three orders and one order of magnitude respectively, lower than that of the untreated parent alloy. After ion etching, the corrosion current densities of the laser treated specimens were considerably increased. The time dependence of the polarisation resistances of the ion etched and unetched specimens was also determined. Equivalent circuits were presented to describe the corrosion behaviour of the various laser treated and untreated specimens.
Original languageEnglish
Pages (from-to)284-290
Number of pages7
JournalSurface Engineering
Volume23
Issue number4
DOIs
Publication statusPublished - 1 Aug 2007

Keywords

  • Aluminium alloy
  • Corrosion
  • Laser surface melting

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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