Coke does not dissolve nails.
I performed an experiment in duplicate with both galvanized and regular nails in coke, lemon juice, orange juice, and vinegar. I accurately weighed the nail before and after. In 4 days, the nails in the coke dissolved the least.
% loss in regular nail
- Coke: 0.10%
- Lemon Juice: 0.37%
- Vinegar: 0.61%
- OJ: 0.10%
% loss in galvanized nail
- Coke: 0.86%
- Lemon Juice: 8.76%
- Vinegar: 7.09%
- OJ: 5.89%