Cavitation is caused by the violent implosion of gas bubbles on or near a metal surface. In the case of wet sleeve engines, the gas bubbles are created by high frequency vibration of the cylinder sleeve that produce pressure changes in the fluid surrounding the "wet" surface of the sleeve. The vibration is caused by extremely high combustion chamber pressures in high compression engines, which is why wet sleeve diesel engines are highly susceptible to cavitation.
Electrolysis is the process by which charged atoms, or ions, are separated from molecules in a fluid or solution that has electric current passing through it. The current moves the newly freed atoms to a metal surface, acting as a cathode or anode depending on the charge of the ion; thereby coating the metal surface with material. Anodizing is exhibit A for electrolysis.
Nothing I have found says that cavitation cannot occur in wet sleeve gas engines, but I suspect that it is much less of a problem, if a problem at all, in gas engines with compression ratios under 10:1.
If you have a wet sleeve diesel engine, you should definitely be running coolant with the appropriate additives for preventing cavitation from occurring.
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