Marine-grade refers to aluminium alloys with strong corrosion resistance, suited to salt-air and coastal exposure. Aluminium naturally forms a protective oxide layer that resists the kind of corrosion that rusts steel.
It is the reason woodgrain aluminium performs near the coast where timber greys and steel fixings rust, though a periodic fresh-water rinse still helps clear salt build-up.
Planning a woodgrain aluminium project?
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