Corrosion Inhibitor additives for water based (aqueous) metal working systems. Additives for hydrotesting, pressure testing, boiler and equipment shutdown/layup, metal cleaning solutions, rinse water, ballast tanks, boilers, storage tanks, machiine coolants, industrial process water and other processes where a corrosion inhibitor treatment is required. VCI water treatment protects metals above, below and at the water line from damaging corrosion.