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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
TROUBLESHOOTING : What causes tiny bubbles when coating aluminum. In general there are 3 main causes of a bubbling finish. The first and most common cause is from the base substrate material gassing out. Some metals are more prone to gassing than others, with softer metals like aluminum and cast metals usually being the worst offenders. We recommend outgassing all projects prior to coating for this reason.