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The Appearance of Pitting on Thermally Grown Aluminum Oxide caused by Surface Segregation of Fe Impurities from the Bulk

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Published/Copyright: October 29, 2016
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Practical Metallography
From the journal Practical Metallography Volume 53 Issue 11

Abstract

The oxidation of 99 wt.-% purity (low purity – main impurities were Fe and Si) and 99.999 wt.-% purity (high purity) Al foil was studied using a thermo-gravimetric method. The Al oxide was characterized with several techniques such as scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS). The Al foils were oxidized in a 50 % O2 – 50 % Ar mixture between 773 and 843 K. Microscopic examination (SEM) of the oxide revealed that “pitting” occurred on the low purity Al. High Si and Fe concentration were found on the surface or near-surface of the oxide. The presence of Fe, as precipitates, on the surface of the oxide accounts for the pitting of the oxide. XPS inspection revealed the formation of γ-Al2O3 with the presence of some Al hydroxide.

Kurzfassung

Unter Anwendung eines thermogravimetrischen Verfahrens wurde die Oxidation von Al-Folie einer Reinheit von 99 Gew.-% (geringe Reinheit – Hauptverunreinigungen waren Fe und Si) und einer Reinheit von 99,999 Gew.-% (hohe Reinheit) untersucht. Das Al-Oxid wurde anhand verschiedener Techniken wie beispielsweise Sekundärelektronenmikroskopie (SEM), energiedispersiver Röntgenspektroskopie (EDX) und Röntgen-Photoelektronenspektroskopie (XPS) charakterisiert. Die Al-Folien wurden in einer Mischung aus 50 % O2 und 50 % Ar zwischen 773 und 843 K oxidiert. Die mikroskopische Untersuchung (SEM) des Oxids ergab, dass auf dem Al geringer Reinheit „Lochfraß” auftrat. Auf oder nahe der Oberfläche des Oxids wurden hohe Si- und Fe-Konzentrationen festgestellt. Der Lochfraß des Oxids ist auf das Vorhandensein von Fe in Form von Ausscheidungen auf der Oberfläche des Oxids zurückzuführen. Bei der XPS-Untersuchung zeigte sich die Bildung von γ-Al2O3, sowie geringen Mengen an Al-Hydroxid.

Übersetzung: M. Lackas

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Received: 2016-04-12
Accepted: 2016-04-26
Published Online: 2016-10-29
Published in Print: 2016-11-15

© 2016, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Metallographic Preparation of Hard Coatings for EBSD Analysis
  7. The Appearance of Pitting on Thermally Grown Aluminum Oxide caused by Surface Segregation of Fe Impurities from the Bulk
  8. SEM and EBSD Characterization of Bi-Layered Functionally Graded Hard Metal Composites
  9. Failure Analysis of Slurry Pump Impeller Fractured at Collahuasi Mine
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110427

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Metallographic Preparation of Hard Coatings for EBSD Analysis
  7. The Appearance of Pitting on Thermally Grown Aluminum Oxide caused by Surface Segregation of Fe Impurities from the Bulk
  8. SEM and EBSD Characterization of Bi-Layered Functionally Graded Hard Metal Composites
  9. Failure Analysis of Slurry Pump Impeller Fractured at Collahuasi Mine
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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