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Corrosion Damage to a Dropped Handlebar Made of AA7075

  • M. Schneider , U. Langklotz and K. Sempf
Published/Copyright: May 23, 2013
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Practical Metallography
From the journal Practical Metallography Volume 49 Issue 8

Abstract

Damage by corrosion was discovered on a dropped handlebar made of AA7075 during an inspection at a workshop. The possible causes are presented and the corrosion types encountered are interpreted. Stress corrosion or corrosion fatigue under the effect of chloride can be concluded from the damage pattern and reconstructed conditions of use. The heterogeneous microstructure containing a large number of intermetallic precipitates accelerates the start of corrosion because microgalvanic elements are formed. Although aluminium alloys, when in an urban environment, do not exhibit a pronounced tendency to corrosion the conditions of corrosion can locally change in use to such an extent that corrosion damage will occur. In the present case, a remedy can primarily consist in inspections at well-adapted intervals and the exchange of the handlebar tape in good time.

Kurzfassung

Ein Korrosionsschadensfall an einem Rennradlenker aus AA7075 wurde bei einer Werkstattinspektion entdeckt. Es werden mögliche Ursachen dargestellt und die aufgetretenen Korrosionsarten interpretiert. Schadensbild und rekonstruierte Einsatzbedingungen lassen auf eine Spannungs- bzw. Ermüdungskorrosion unter Chlorideinfluss schließen. Das heterogene Gefüge mit einer Vielzahl intermetallischer Ausscheidungen beschleunigt einsetzende Korrosion durch die Ausbildung mikrogalvanischer Elemente. Obwohl Aluminiumlegierungen in urbaner Atmosphäre keine ausgeprägte Korrosionsneigung zeigen, können sich im Einsatz die Korrosionsbedingungen lokal soweit verändern, dass es zum Korrosionsschaden kommt. Abhilfe kann im vorliegenden Fall in erster Linie durch angepasste Inspektionsintervalle und den rechtzeitigen Austausch des Lenkerbandes erfolgen.

Translation: J. Fritsche

Michael Schneider studied at Mining Academy Freiberg, Germany. Dipl.-Ing. in materials science in 1989. Graduated as Dr.-Ing. at TU Dresden in 1993. Since 2006 group manager electrochemistry at Fraunhofer IKTS Dresden. Currently, he is dealing with functional oxide films, electrochemistry of materials for energy storage systems, electroplating and electrochemical machining.

Ulrike Langklotz studied at Mining Academy Freiberg, Germany. Diploma in Chemistry in 2008. PhD student at TU Dresden since 2008. Working fields are dielectric oxide films on valve metals and electrochemistry of materials for energy storage systems.

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Received: 2012-2-11
Accepted: 2012-4-8
Published Online: 2013-05-23
Published in Print: 2012-08-01

© 2012, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Analysis of the Crack Initiation at Non-Metallic Inclusions in High-Strength Steels
  7. Evaluation of Diffusion Bonding (Welding) Process Temperatures of AISI 1010 Plain Carbon Steel with AISI 430 Ferritic and AISI 420 Martensitic Stainless Steels
  8. Effect of Austempering Temperature and Time on the Kinetics and Microstructure of Austempered Compacted Graphite Cast Irons
  9. Corrosion Damage to a Dropped Handlebar Made of AA7075
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110179

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Analysis of the Crack Initiation at Non-Metallic Inclusions in High-Strength Steels
  7. Evaluation of Diffusion Bonding (Welding) Process Temperatures of AISI 1010 Plain Carbon Steel with AISI 430 Ferritic and AISI 420 Martensitic Stainless Steels
  8. Effect of Austempering Temperature and Time on the Kinetics and Microstructure of Austempered Compacted Graphite Cast Irons
  9. Corrosion Damage to a Dropped Handlebar Made of AA7075
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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