[Boatanchors] white dust on aluminum

[J. Forster]

Is the item a casting? I think some casting alloys contain a lot of
magnesium, which corrodes more than alloys with less Mg?

Best,

-John

================

> Any mildly acetic solution should remove the "dust" which is corrosion
> due to oxygen breaching the protective layer on the aluminum.  Muriatic
> acid or vinegar either should remove the layer.  I would try the vinegar
> first along with a Scotchbrite pad.
>
> Once the corrosion is removed use something to seal it against the air.
> Clear spray made by Kryon will work but do be careful because a scratch
> will expose the surface again.
>
> Jim/W5JO
>
> ----- Original Message -----
>
>
>
>>I have a piece of  equipment in an aluminum case that has been in a
>>very humid
>> environment and was sweating due to condensation  in the shipping
>> crate. The
>> instrument case has suffered from the condensate.
>>
>>
>> The aluminum, after drying, has a coat of aluminum dust or powder that
>> needs to
>> be removed. It is a very valuable instrument and can be very useful in
>> the shop
>> and shack.
>>
>> If anyone can tell me how to remove the white powder that I believe to
>> be
>> oxidation, I will greatly appreciate it. Chemistry was not my strong
>> subject.
>> Come to think of it, I don't think I had a strong subject.
>>
>> Assisting with your chemical expertise will be appreciated. 73, John,
>> K5PGW
>>
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