Entirely true, and they both cause similar damage. We are very familure with
galvanic corrosion in the brine waters of the St. Johns. You can actually
measure the electrical production with a sensitive multimeter. Electrolysis
is a symptom of galvanic corrosion. It degrades the anode metal.

The anode installation and wire bonding fix will take care of both, keeping
your boat pretty.


An interesting experiment.
in a plastic bucket, make some salty water.

place a piece of aluminum foil on one side of the bucket. (top out of
water.)

Place a piece of stainless steel on the other side.(top out of water.)

Set a multimeter to its most sensitive (millivolts) setting and dip one
probe in the center of the bucket. Touch the other probe to the stainless.
record results.

move Aluminum closer to stainless and repeat measurements. record results.

attach a piece of immersed copper wire to aluminum. Allow to stand for 1
day.

Observe stainless steel.

Next

discard salt soulution and rinse container.
place aluminum foil in bottom of bucket.
Mix HOT water with 2 tablespoons of baking soda.
place badly tarnished sterling silver spoon (or other item) so it does not
contact the foil, and measure millivolts from item to water. record results

next make contact with the foil while observing meter. It should spike
sharply and the tarnish jump from the silver to the foil.




--
Capt. Frank

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www.home.earthlink.net/~aartworks
"Joe Blizzard" wrote in message
...
"Capt Frank Hopkins" wrote
Electrolysis, otherwise known as galvanic corrosion

Begging leave to differ, Capt Frank, but they're two different things.
What
you're describing is galvanic action caused when dissimilar metals
immersed
in an electrolyte decide to act like a battery and generate electric
current
all by themselves. Electrolysis happens when an external source of
electrical current, like your starting battery or shore power supply,
generates electrical current through the water.