Abstract
A comparative study on the nitrogen containing reductants viz., 8-hydroxyquinoline (8-HQ) and Diphenyl carbazide (DPC) was carried out to evaluate them for corrosion control in systems of water cooled nuclear reactors especially under shut-down or cold conditions. Corrosion rates were measured both by weight loss and electrochemical techniques. Studies revealed complementary nature of the reductants. 8-HQ showed better dissolved oxygen scavenging capability, thermal and radiation stability while DPC was well retained in the liquid phase besides showed favourable red-ox potential and minimum pickup on ion exchange resins. The corrosion control efficiency of 8-HQ for carbon steel surface was 48% in comparison to open-air condition containing 8 mg/l of dissolved oxygen while it was 66% in the case of DPC. Both the reductants are equally good candidates for corrosion control with complementary properties and the choice will depend on the requirement of the plant at the time of actual field application.
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