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Re: [EVDL] Brass & corrosion: how much is "normal"

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Re: [EVDL] Brass & corrosion: how much is "normal"

I have a square D switch, which contains the
diaphragm. In no place did I say the _pump_ was
I can also assure you that _one specific bolt_, not
bolts, on the top of the Gen. 5 Honda Civic
transmissionis quite yellow, hence my conclusion that
it was brass.
Your take on the electroplating is interesting.
Still wish US Battery would get back to me.

By the way, FWIW, Interstate has been bought out, and
at least one source says they will not not be carrying

--- [email protected] wrote:

> None of the corrosion you refer to is "normal" and
> it is almost certainly
> not brass. For sure the bolts in the transmission
> are not brass. It is unlikely
> that the vacuum pump housing is made of brass
> either. You don't say what
> type of pump you have. It may be made from
> electroplated ferrous metal, or from
> aluminum that has been chromated to a golden/brassy
> color.
> The bolts would be made from ferrous metal which
> would then electroplated
> with either zinc, cadmium, or an alloy of tin-zinc.
> After electroplating the
> bolts would be given a chromate coating which could
> look either bright and
> silvery, gold in color (often mistaken for brass)
> or black. There are others
> colors too, but those are the ones used most
> commonly in the automotive industry
> for electroplated parts. Olive drab is sometimes
> used, but more seldom.
> The electroplated coatings are used to keep the
> ferrous metal substrate from
> corroding. The secondary chromate coating is used to
> prevent the
> electroplated coating from corroding. It's a two
> step anti-corrosion process that works
> very well under normal conditions.
> If a bolt is going to be used to fasten a piece of
> aluminum, it HAS to be
> coated with either cadmium, or tin-zinc alloy. Very
> often cadmium or tin-zinc
> is color coded with the gold chromate. Zinc is not
> at all compatible with
> aluminum, and for that matter neither is brass.
> The chromate coatings are very thin. Polishing them
> would only remove the
> chromate coating and maybe even the electroplated
> coating. Then the parts would
> look bad again, but even sooner. Your best solution
> would be to replace the
> corroded bolts and try to prevent the sulfuric acid
> "mist" from occurring
> again.
> Those are just the basics, but it should help you
> decide on a course of
> action.
> Lawson Huntley
> ************************************** Get a sneak
> peek of the all-new AOL at
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