SEDL / STP / STP908-EB / STP17459S

Corrosion of Carbon Steel in Concentrated Naoh Solutions: Influence of LIOH Additions

Belletête, M
Research associate, assistant research officer, and senior research officer, Industrial Materials Research Institute, National Research Council of Canada, Boucherville, PQ

Vijayan, CP
Research associate, assistant research officer, and senior research officer, Industrial Materials Research Institute, National Research Council of Canada, Boucherville, PQ

Hechler, J-J
Research associate, assistant research officer, and senior research officer, Industrial Materials Research Institute, National Research Council of Canada, Boucherville, PQ

Pages: 9    Published: Jan 1986

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Abstract

The present study aims at determining quantitatively the influence of lithium hydroxide (LiOH) as an inhibitor on the corrosion behavior of carbon steel in a 33-weight percent sodium hydroxide (NaOH) solution at temperatures <110°C. This work is conducted as a prelude to further high temperature studies dealing with stress corrosion. Potentiodynamic methods are used in determining the influence of LiOH additions. Cyclic voltammograms indicate gradual variation in the intensities corresponding to certain peaks, depending on the presence or absence of LiOH and on the temperature of the solution. An improvement in corrosion behavior is indicated when LiOH is present at a concentration of 20 g/L. Apparent activation energies are calculated and certain ideas are put forward in order to explain the behavior of carbon steel in NaOH containing LiOH.