Quote:
Originally Posted by LWJ
I think. Not certain, that this is a surface coating failing.
Aluminum self seals with an oxide layer. Anodizing is this process in the extreme.
An oddity? Aluminum is reactive to both a base and an acid.
I couldn't exactly see what was happening here on an iPad. Perhaps a large screen would give more detail.
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I concur. I don't see it bubbling or pitting. Surface failure. That said al sprockets are wear items.
Upon closer look at photos on my small ass iPhone. It is flaking and pitting. Still surface failure. Corrosion would be my guess. Salted roads? You can refinish them... Lots of cool coatings you can do with al.