Photo Gallery > Corrosion Related Failures
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Transgranular Stress Corrosion Cracking.jpg
This view is a Transgranlular Cracking (Transgranular Attack) which was from Stress Corrosion Cracking or SCC. The view shows the branching pathways which are usually through the region having the most stress. This causes the branching to occur in multiple and unpredictable directions. This crack was classified by using a SEM/EDA as a Chloride Stress Corrosion Cracking. Magnification is approximately 50X.
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Dezincification 50x.jpg
This is the most common type of selective leaching which occurs is brass alloys containing more than 15% zinc. The classification for this type of attack is "Dezincification". Now there are two types of classifications which dezincification falls under, uniform or layer-type and Plug-Type. Uniform dezincification occurs almost unifromily along the surface exposed. Plug-Type results in localized penetrations of the dezincified areas which progress through the thickness of the material. The photos shows a Plug-Type which is localized to an area or areas (non-uniform from surface).
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intergranular attack Aluminum 6061 T6.jpg
Intergranular attack on aluminum 6061 T6. This is a labratory induced corrosion test, where the specimen was submerged in Sodium Chloride (NaCl) at 5% consentration for about a day. 6061 has a very high rating for resistance to genral corrosion and stress corrosion. This testing is preformed to verify heat treatment process to T6 was achomplished, without detramental effects for base material. This is not a view of a failure.
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