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<jls1016@bellsouth.net> wrote in message
news:1134594283.801117.232090@g47g2000cwa.googlegroups.com...
> Is your 6061 alclad?
>
> Most of my sheet aluminum use is 2024, which is almost universally
> alclad.
>
> As you probably know, 6061 is more corrosion resistant than 2024.
>
> If the corrosion isn't deep or pitted, alodine it and go on. I. e.,
> use phosphoric acid treatment to remove the stain and then passivate
> the surface with a chromic acid etch.
>
Thanks, there is not any pitting at all just a surface layer of white powder
but it is hard to get off. 6061 rules!
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Re: Cleaning Aluminum
