Because acids dislodge rust, and Coca-Cola contains citric acid, which is a very weak acid. If you’re looking for a comestible to remove rust, vinegar would work better.
citric acid can also chelate iron to some degree so on acid basis citric acid should dissolve rust a bit better than most. but coke is made with phosphoric acid which doesn’t do that
Because acids dislodge rust, and Coca-Cola contains citric acid, which is a very weak acid. If you’re looking for a comestible to remove rust, vinegar would work better.
citric acid can also chelate iron to some degree so on acid basis citric acid should dissolve rust a bit better than most. but coke is made with phosphoric acid which doesn’t do that
I don’t know where you are, but real Coke is made with phosphoric acid, which is also used for rust removal or conversion.