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>do you suggest that perhaps we should all change our aluminium crank cases, gear box casings, cylinder heads, wheel rime etc etc etc for stainless steel in case they all "rot" away in a couple of years.
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>I suppose that we should also avoid going anywhere near shopfronts, aluminium entrance doors and stay away from thode big glazed roofs in shopping malls etc as they might fall on us.
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>A question if I may, as there are many boats with aluminium hulls floating about on the high seas are the crews and passengers in danger of drowning any time soon?
With respect, it is you that's "over simplifying" - where Geoff has posted "aluminium", it's highly-unlikely to be pure aluminium, it'll be alloyed with something else, that "something else" could well be what's caused the Exmouth RNLI station copper roof to require replacement.
Generally, "aluminium" components on Britbikes do not need changing as British motorcycle makers seem to have managed to choose stable alloys. Otoh, I can say from first-hand experience that isn't always the case on Japanese bikes ...
Otoh, you would be wise to avoid "aluminium" shopfronts, doors and/or shopping-centre roofs unless you could be sure the installer used fasteners that wouldn't corrode the chosen alloy.
However, I can say from first-hand experience that there are very few aluminium alloy hulls "floating about on the high seas" because the material is a monumental pita if immersed in sea water, the material is generally only used for hulls if there is some special requirement that cannot be met by more common materials like more-stable plastics, easier-maintained steel. Aluminium alloys have been used for large ships' superstructures for about sixty years, for the obvious reason; still a pita though, needs a lot more care than a steel superstructure.
Regards,
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