I always felt that someone using a wide flat anode should use two
cathodes - one on each side of the flat anode.
Dan
Subject:Re: CS>Square or round wires?
From:Ode Coyote <[email protected]>
Date:Sun, 13 Nov 2005 07:02:59 -0500
To:[email protected]
Where ion discharge is concerned, the area presented does not discharge
ions in direct proportion to the area presented.
On wide flat electrodes, the center does very little while the edges
discharge the greater proportion of the ions. It's visibly obvious that
there's a big difference while observing how electrodes wear away.
The back sides do virtually no ion discharging.
Corners and edges disappear first, corners faster than edges, till
finally you have a "U" that looks much like "V" with a rounded tip
instead of a rectangle.
The newer electroplating electrodes are made in a "D" shape with the
rounded side being the side not facing. This shortens the pathways from
the back, eliminates the secondary backside edge that a block has and
evens out the actual discharge area some.
Round shapes have no backsides, ineffective side facing flat centers,
corners or edges, except for the end.... which will sharpen with the
disproportionate discharge occurring there.
Distance counts.
The front of a round will go away a 'little' faster, [Which is why
modern electrodes aren't 'round cylinders'] but swapping their positions
between batches makes the former back the front and a piece of wire
doesn't have the front/back distance differences that a 20 pound
cylinder of copper has and the size/distance relationships aren't
linear. ie, the smaller the diameter, the less the effect.[but also less
surface area]
Bending the very tips away from each other a bit will prevent tip
erosion to a great degree..or..don't put the ends in the water in the
first place.
A round wire has ..almost.. twice the 'effective' discharge area than a
flat rectangular electrode with the same surface area.
A square wire run with flats parallel will become a rounded wire...more
"D" shaped, actually, with the rounded part facing as the leading edges
do most of the work.
Ode [ex electroplater]
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