Steam assisted oxide growth on aluminium alloys using oxidative chemistries: Part I Microstructural investigation

Rameez Ud Din, Kamila Piotrowska, Visweswara Chakravarthy Gudla, Morten Stendahl Jellesen, Rajan Ambat

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Abstract

The surface treatment of aluminium alloys under steam containing KMnO4 and HNO3resulted in the formation of an oxide layer having a thickness of up to 825 nm. The use of KMnO4 and HNO3 in the steam resulted in incorporation of the respective chemical species into the oxide layer. Steam treatment with solution containing HNO3 caused dissolution of Cu and Si from the intermetallic particles in the aluminium substrate. The growth rate of oxide layer was observed to be a function of MnO4and NO3ions present in the aqueous solution. The NO3ions exhibit higher affinity towards the intermetallic particles resulting in poor coverage by the steam generated oxide layer compared to the coating formed using MnO4ions. Further, increase in the concentration of NO3ions in the solution retards precipitation of the steam generated aluminium hydroxide layer.
Original languageEnglish
JournalApplied Surface Science
Volume355
Pages (from-to)820-831
ISSN0169-4332
DOIs
Publication statusPublished - 2015

Keywords

  • Aluminium alloys
  • Steam
  • Permanganate
  • Nitrate
  • NitrateFIB-SEM
  • XPS

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