Mike Raiford wrote:
> Bill Pragnell wrote:
> 
>> The initial oxide layer. It slows further oxygen access to the bulk
>> beneath.
>> Aluminium oxide is particularly effective at this - many high-temperature
>> alloys are designed with this phenomenon in mind.
> 
> The oxide layer also doesn't flake off like, say, iron oxide. So no
> fresh metal is exposed.
> 

Unless you expose it to mercury, then it flakes off as fast as it forms.

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