The use of acid in a galvanic cell, such as in a sufuric or hydrochloric acid bath, generates hydrogen as a result of the reduction/oxidation reaction taking place and it also generates a small current. This is, in effect, a battery. If you apply the current, you are forcing the current to flow to run the redox reaction, and this liberates the hydrogen that breaks up the scale. Same action taking place, current flow is reversed.
__________________
Chairman and CFO, Singing Anvil Forge.
All the world is a stage and a lot of us are acting poorly.
|