Electrolysis or galvanic corrosion, is the reaction caused by two dissimilar metals coming into contact with each other in a corrosive atmosphere or in sea water. Electrolytic corrosion is slightly different and is due to electrical current from other sources leading to problems.
NOTE: These subjects are highly complex and any continual blistering, corrosion or erosion on the underwater areas of steel or aluminium boats should be diagnosed by an expert on the subject. This short article can only give a very brief and incomplete view on the subjects.
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