On the microstructural and electrochemical nature of hydrothermally treated Al-Zr and Al-Ti surfaces

Juan Tan, Marco Crosio, Nadja Maria Vinkel, Peter Jensen, Shoshan Tamar Abrahami, Visweswara Chakravarthy Gudla*, Rajan Ambat

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Hydrothermal treatment of sputtered Al-Zr and Al-Ti coatings was performed in an autoclave. Electron microscopy of generated conversion layers revealed dual layered boehmite films. Needle morphology at top, and thin compact oxide at interface with metal substrate was observed. X-ray energy dispersive, and photoelectron spectroscopy revealed enrichment of Zr or Ti in compact oxide, and oxidation of Zr, Ti and Al. Potentiodynamic polarization showed decrease in passive current densities due to treatment. Treated Zr containing surfaces showed lower corrosion current density when compared to those containing Ti. The observed electrochemical properties are correlated with microstructure and composition of conversion layers.
Original languageEnglish
Article number108244
JournalCorrosion science
Volume163
Number of pages13
ISSN0010-938X
DOIs
Publication statusPublished - 2020

Keywords

  • A. Aluminium
  • A. Sputtered films
  • B. Polarization
  • B. TEM
  • C. Passive films
  • C. Interfaces

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