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.
I don’t know where you are, but real Coke is made with phosphoric acid, which is also used for rust removal or conversion.
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