Dissolved Ozone Effect on Corrosion of Metals in Water

Abstract

The dissolved ozone effect on metal corrosion behavior in water was investigated by immersion tests at stagnant state, slow flow state and fast flow state, and by electrochemical measurements at stagnant state. Corrosion rates for low alloy steels, copper and brass increased with increasing ozone concentration at various water flow states. Carbon steel also showed the same behavior at stagnant state. This is because ozone acts as an accepter of electrons produced by the metal dissolution reaction. On the contrary, carbon steel in deionized water at fast flow state was passvvated by ozone. Ozone seems to have passivation ability, as oxygen. Stainless steels also gained stronger passivation state by the contact with ozone.