So I understand that this corrodes to keep the hull of the boat from corrodong but why? And what causes the corrosion in the first place?
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It’s like putting a piece of bad food in a trap so bugs don’t go after the food you want to eat.
The metal is designed to attract electrons and get eaten more easily and quickly than the metal you care about (engine/drive parts). Since the metal is cheap and easy to replace, you just put a sacrificial anode on it and let the bugs eat away, replacing it every so often.
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