Many boaters do not have a technical background, and the subjects of electricity and underwater corrosion are mystifying to them. Even so-called "experts" can't seem to agree on some of the issues!
Most boaters have heard of the term "electrolysis", and understand that this is some type of problem that can cause extensive damage to the underwater metallic components of a vessel. There are actually several different mechanisms involved, and they must all be considered. The common thread in all of this is "electricity", so a fundamental understanding of this is required before proceeding further.
In 2015 I presented a special lecture to the Royal Victoria Yacht Club entitled "Electricity, Electrolysis, and Galvanic Corrosion". I published a comprehensive set of seminar notes to go with this lecture, and they can be accessed via the following link: