The Influence of Sample Preparation on SEM Measurements of Anodic Oxide Layers
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Joanna Korzekwa received her PhD in Materials Engineering in 2007 at the University of Silesia in Katowice, Poland. She is now professor assistant in the Department of Technology of Surface Science at the University of Silesia. Her research interests are related with aluminum oxide layers on aluminum alloys.Aneta Gądek-Moszczak received her PhD in 2005 at the Cracow University of Technology, Poland. She is now professor assistant at the Institute of Applied Informatics at Cracow University of Technology. Her research interests included application of computer image analysis and stereology in material science, biology and medicine.
Abstract
Coatings with high wear, corrosion resistance and sliding properties are desirable in tribological applications, especially for oil-free nodes. In order to obtain such coatings on aluminium alloy the anodizing process is one of the methods which is commonly used. In the present research two kinds of anodic oxide layer were prepared. One series of samples comprised amorphous oxide layer Al2O3 obtained on aluminium alloy EN AW 5251. The second one was the composite oxide layer Al2O3 with inorganic fullerene-like tungsten disulfide (IF-WS2). The addition of IF-WS2 to an acid bath is used to reduce the friction coefficient of the oil free friction pair. The aim of the study is the analysis of the surface and fresh cross section of the samples depending on the kind of conductive metal used for SEM examination. Gold and carbon were used in order to prevent the charging of a specimen with an electron beam in the conventional SEM mode. Significant differences in the interpretation of results were found.
Kurzfassung
Tribologische Anwendungen, insbesondere trockene Reibpaarungen, erfordern Beschichtungen mit hoher Verschleißfestigkeit, hoher Korrosionsbeständigkeit und guten Gleiteigenschaften. Eines der gängigen Beschichtungsverfahren für Aluminiumlegierungen ist das Anodisieren (anodische Oxidation). Für die vorliegende Untersuchung wurden zwei verschiedene Arten anodischer Oxidschichten erzeugt. Für eine Probenserie wurden auf einer Aluminiumlegierung EN AW 5251 amorphe Oxidschichten (Al2O3) erzeugt. Für eine zweite Probenserie wurde ein Verbund aus Al2O3-Oxidschicht und anorganischem fullerenartigem Wolframdisulfid (IF-WS2) aufgebracht. Die Beimengung von IF-WS2 zu einem Säurebad dient der Reduzierung des Reibungskoeffizienten der trockenen Reibpaarung. Ziel dieser Untersuchung ist die Analyse der Oberfläche und des unbehandelten Querschnitts der Proben in Abhängigkeit des für die REM-Untersuchung verwendeten leitfähigen Metalls. Um im konventionellen REM-Modus die Aufladung einer Probe durch einen Elektronenstrahl zu verhindern, wurde mit Gold und Kohlenstoff gearbeitet. Bei der Interpretation der Untersuchungsergebnisse ergaben sich wesentliche Unterschiede.
About the authors
Joanna Korzekwa received her PhD in Materials Engineering in 2007 at the University of Silesia in Katowice, Poland. She is now professor assistant in the Department of Technology of Surface Science at the University of Silesia. Her research interests are related with aluminum oxide layers on aluminum alloys.
Aneta Gądek-Moszczak received her PhD in 2005 at the Cracow University of Technology, Poland. She is now professor assistant at the Institute of Applied Informatics at Cracow University of Technology. Her research interests included application of computer image analysis and stereology in material science, biology and medicine.
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- Contents
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- Experimental Research on Properties of Naval Brass Castings
- Metallurgical Failure Investigation of a Deformed and Cracked Lashing-Load Ring of a Heavy-Duty Gas Turbine Engine
- Friction Stir Welding of 7075-T651 Aluminium Alloy
- The Influence of Sample Preparation on SEM Measurements of Anodic Oxide Layers
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- Picture of the Month
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Experimental Research on Properties of Naval Brass Castings
- Metallurgical Failure Investigation of a Deformed and Cracked Lashing-Load Ring of a Heavy-Duty Gas Turbine Engine
- Friction Stir Welding of 7075-T651 Aluminium Alloy
- The Influence of Sample Preparation on SEM Measurements of Anodic Oxide Layers
- Picture of the Month
- Top-Ten Article Downloads
- Picture of the Month
- News
- PM-news
- Meeting diary
- Meeting diary
