Emergency crews were called to the Port of Melbourne after a cargo ship carrying hydrochloric acid noticed a leaking tank on Saturday morning.
Crew aboard the Captaine Tasman were approaching Melbourne when they saw a leak in a 20,000 litre tank containing 33 per cent acid.
MFB Dangerous Goods were notified and met the ship when it berthed at Yarraville dock about 10am.
An MFB spokesman said the acid leaked onto the ship and did not enter Port Phillip Bay.
Paramedics, police and WorkSafe inspectors attended.
The EPA has been notified.
