Take two 5 gallon buckets. put a chain in one then a gallon of phosphoric acid then add water until the chain is covered. leave it in for an hour. then fill the other bucket with water, transfer the chain to it, leave it in for an hour while second chain is in acid bath. remove first chain to dry. It is now coated in black iron phosphate. you can top-coat if you want or leave them, but they are now protected.
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