[ARC5] Aluminum Chassis cleaning (and 'that' philosophical question

[Richard Knoppow]

    Evapo Rust claims it will not attack paint.  The MSDS gives not a 
clue as to what's in it but no solvents are listed.
    FWIW both Naval Jelly and Aluminum Jelly seem to use phosphoric acid 
as the main ingredient.  Some of the other ingredients are different. I 
don't know what makes one suitable for aluminum and the other not.
    Tarn-X contains thiourea, another reducing agent, I don't know if it 
works on aluminum.
    Zud and Barkeeper's Friend are nearly identical cleaners using 
oxalic acid, another reducing agent.
    Some rust removers that work on ferrous metals, copper, brass and 
silver, will blacken aluminum.

On 12/29/2015 4:18 PM, Robert Eleazer wrote:
> A phosphoric acid etch, or similar product such as "Aluminum Jelly" 
> can be used to clean oxidized AL.  But be aware that it is an acid and 
> may have undesirable effects on other components.  After the acid etch 
> you can use an Alodine chromate conversion coating dip to reduce 
> further corrosion.
>
> Another possibility that is rather more benign is Evapa-Rust, which 
> will clean AL as well as steel.  However it will also remove paint in 
> the process.
> Wayne
> WB5WSV
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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