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Indexed by:期刊论文

Date of Publication:2018-08-01

Journal:CORROSION SCIENCE

Included Journals:SCIE

Volume:140

Page Number:182-195

ISSN No.:0010-938X

Key Words:Calcium carbonate scale; Electrochemical corrosion; Interfacial scaling mitigation; Carbon steel; Stainless steel; NaNO2 corrosion inhibitor

Abstract:Corrosion-induced CaCO3 scaling is extremely widespread at metal/water interface. However, the anti-scale and anti-corrosion behaviour of existing inhibitors have mostly. been investigated separately without considering their interaction. Herein, the roles of corrosion inhibition in mitigating interfacial scaling were evaluated on carbon steel and stainless steel by introducing NaNO2 to enhance their corrosion resistance. Results reveal that corrosion-induced pH increase at micro cathodes dominates the interfacial scaling processes by inducing rapid nucleation. A temperature elevation promotes interfacial scaling mainly through aggravating steel corrosion. Once the micro cathodic processes are inhibited, CaCO3 scaling can be evidently retarded even at elevated temperatures.