pete at dunnington.plus.com
Mon Jan 19 07:43:11 CST 2009
On 19/01/2009 04:23, Mike Loewen wrote:
> I'm in the process of rejuvenating an IBM model 29 keypunch, and a
> couple of areas have some sort of oxidation on them. The card drum is
> the worst:
> The steel parts are fine, but the rest has a white material over most
> of it. I'm not sure what sort of metal it is, looks a bit dark for
> aluminum but the white material looks similar to aluminum oxidation.
> What's a good approach to cleaning it up?
It looks to me like Mazak, which is a zinc-aluminium (and sometimes some
magnesium and copper) alloy used for die-casting. You could try steel
wool or a wire brush but I would bet it's badly pitted and probably
Pete Peter Turnbull
University of York
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