Influence of Temperature on the Inhibiting Action of Benzazoles in Ozonized Sulfuric Acid

We showed that benzazoles are inhibitors of acid corrosion in ozonized solutions of 5% and 20% H2SO^sub 4^. Benzazoles are oxidized under the action of ozone and decrease its concentration and influence on steel: benzotriazole does so more than benzimidazole. An increase in the of temperature of ozonized solutions of 5% and 20% H2SO^sub 4^ to 60°C and 40°C, respectively, significantly lowers the inhibiting action of benzotriazole; the inhibiting action of benzimidazole drops with increase in temperature to 40°C and 20°C, respectively.