Re: 2004 Accord coupe: Proper charging voltage

"jim beam" <spamvortex@xxxxxxxxxxxxxxx> wrote in message news:2oqdnRiFVIZVo5XanZ2dnUVZ_vLinZ2d@xxxxxxxxxxxxxxxx
Jim, in case of the galvanized steel you have direct electrical
path available between two metals (steel and zinc) in every
place where you have a pore in your body paint and a rain drop...
If you have car made of galvanized steel, whole car submersion
in electrolite is not required for the zinc to work.

Read my other post in this thread and you will understand that
naked steel + zinc anode attached and galvanizing are simply two
implementations of THE SAME electro-chemical principle.

no, that's not correct. galvanizing or sherardizing are /not/ the same as sacrificial anodic protection. with the latter, you can have a huge-ass ship-sized chunk of naked steel, contiguous electrolyte, a sacrificial anode, and no corrosion in the steel. the anode corrodes like the blazes. IT DOES NOT WORK if the electrolyte is not contiguous because the electron flow generated by the anode electrolysis is not transmitted to the areas not contacted with contiguous electrolyte.

with galvanizing and sherardizing otoh, you have contiguous plating which protects in /two/ ways. first is [comparatively] passive plating. second is a localized electrolytic cell disruption. this works with or without liquid electrolyte.

Check my quotations from the other post.
They specificaly use the term "sacrificial anode" in galvanized steel.

so, getting back to cars, a lot of modern vehicle body panels are sherardized, and this gives the passivating protection you're seeking to establish. but you CANNOT achieve this same effect by bolting a bit of zinc onto the chassis of a car and have it protect the whole vehicle unless there is contiguous electrolyte. even in seattle in the depths of winter rain, they don't have tha

I have never stated in this discussion that you can achieve the
same by bolting a chunk of zinc to a car... You do not need to
do it. However, if you have zinc plated panels you are protected
by the zinc layer on the same principle.

and getting back to the op's doohickey, it's a total waste of money, and designed by someone
with insufficient understanding of corrosion principles.

Do you know the design details of this doohickey?
.

Relevant Pages

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  • Re: 2004 Accord coupe: Proper charging voltage
    ... Compare wire fence, steel tube, angle iron or I-beams. ... a sacrificial anode will protect naked steel - sherardizing or galvanizing are simply plating processes. ... is used up you can replace anode and continue protection. ... with electrolyte immersion. ...
    (rec.autos.makers.honda)
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