The durability of ballast water tank anti-corrosion system is studied in this Master's thesis. Since BWM Convention enters into force, the ballast water is to be treated before being stored in the tank and later released in a new location, to prevent the transfer of invasive species through ballast water of ships. Despite of the fact that ballast tank surfaces are covered by anticorrosive coating, tank constructions has been suffering from corrosion. Chemical ballast water treatment affects on epoxy based coating and causes fast corrosive wearing. Since zinc protectors are necessarily used in ballast tanks, chemical treatment of the ballast water reduces durability of them. The experimental part desicated to testing of chemical treatment im...