If there is corrosion on the clamps it is either coming from the pollution in the air as SO2 or there is acid leaking from the battery. Sulphuric acid just does not happen. This is what I was trying to show with my battery clamp and the exposed copper cable that is almost 6 years old and no corrosion.
The fact there is very little corrosion and your batteries are lasting so long should show some correlation. When acid is lost out of a battery and if any water is added the electrolyte is weakened, the specific gravity goes down, the battery life is shorted due to overcharging. The weaker acid changes the resistance, which changes the charging voltage needed. This leads to even more gassing which leads to even more acid loss. The reverse situation where the acid is left to get stronger due to the loss of water will eventually eat up the grid material.
The basis of electrolysis in a battery is the water used to dilute the H2SO4 molecule is split off of the dilute acid solution. The Hydrogen and Oxygen are expelled and the sulfate ion (SO4) stays behind recombining with some of the free H. This causes the specific gravity to rise in the battery. Which is why you add water and not acid. But if the gassing is too vigorous then acid comes out too.
Quote:
What is the electrolysis of dilute sulfuric acid?
In: Acids & Bases [Edit categories]
Answer:
Electrolysis is the breaking up of a compound using electricity. In order for electrolysis to occur the compound must conduct electricity(i.e. have mobile charged particles to carry the charge! here, these are the ions produced when the sulphuric acid dissociates). To electrolyse sulphuric acid, two inert electrodes (e.g. carbon or platinum electrodes) are placed in the solution and connected to a battery cell or main supply of electricity. At the anode oxygen is formed and at the cathode hydrogen. The volume of hydrogen produced, is double the volume of oxygen. It is in fact the electrolysis of water! (ions present: (H)+, (OH)-, from the water, and (H)+, (SO4)2-, from the sulphuric acid. at the cathode, only (H)+ ions go, which turn into hydrogen! at the anode, both anions go, but only (OH)- is discharged, producing oxygen (and water), because the sulphate ion is more stable and so it's more difficult to lose its electrons)
http://wiki.answers.com/Q/What_is_the_electrolysis_of_dilute_sulfuric_acid