Steam assisted oxide growth on aluminium alloys using oxidative chemistries: Part II corrosion performance

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Surface treatment of aluminium alloys using steam with oxidative chemistries, namely KMnO4 and HNO3 resulted in accelerated growth of oxide on aluminium alloys. Detailed investigation of the corrosion performance of the treated surfaces was carried out using potentiodynamic polarisation and standard industrial test methods such as acetic acid salt spray (AASS) and filiform corrosion on commercial AA6060 alloy. Barrier properties of the film including adhesion were evaluated using tape test under wet and dry conditions. Electrochemical results showed reduced cathodic and anodic activity, while the protection provided by steam treatment with HNO3was a function of the concentration of NO3ions. The coating generated by inclusion of KMnO4showed highest resistance to filiform corrosion. Overall, the performance of the steam treated surfaces under filiform corrosion and AASS test was a result of the local coverage of the alloy microstructure resulting from steam containing with KMnO4and HNO3.
Original languageEnglish
JournalApplied Surface Science
Volume355
Pages (from-to)716-725
ISSN0169-4332
DOIs
Publication statusPublished - 2015

Keywords

  • Aluminium alloys
  • Steam
  • Potentiodynamic polarization
  • Filiform corrosion
  • Acetic acid salt spray

Cite this