>> Forgot to include: Vinegar is to neutralize the acid and should be
>> flushed, dried and scuffed before painting. phosphate coating will
>> retard rusting but is not a long term fix.
---->> Bruce Lowry
>
>
>This is slightly off topic, but I'm curious what the vinegar is for. I
>teach chemistry to UNC students and so it strikes me as odd that you would
>treat phosphoric acid with acetic acid (~5% or so in water makes vinegar) to
>neutralize it. I tell our sophomores and freshman that you neutralize
>(carefully) an acid with a base (caustic, sodium hydroxide, etc), not with
>another acid (they lose points for that <gr>).
Mike,
You got me? This struck me as odd too. I always thought you neutralize an
acid with a base too. This was Bruce Lowry's suggestion. If it's someting
I'm going to paint right away, I ususally just rinse in water and dry
quickly, then scuff with a red Scotchbrite, blow with compressed air and
paint. Small parts that I soak I will also rinse in water and towel dry.
Before they go into use I will wire wheel them and usually paint them.
>
>However since acetic acid is more volatile than phosphoric acid (the smell
>of vinegar), maybe it is there to simply replace the non volatile acid for a
>more volatile one. Thus effectively neutralizing the surface (after
>drying).
>
>Does this make any sense, or am I once again missing something.
>
>Prof. Mike
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