POLARIZATION BEHAVIOR OF Fe-Ni-Cr ALLOYS IN CONCENTRATED SODIUM HYDROXIDE SOLUTIONS IN THE TEMPERATURE RANGE 25 degree to 150 degree C.

A. K. Agrawal, K. G. Sheth, K. Poteet, R. W. Staehle

Research output: Contribution to journalArticle

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Abstract

Results are reported for the potentiodynamic polarization at 600 mV/hr of Fe, Ni, Cr, and seven Fe-Ni-Cr alloys in concentrated NaOH solutions in the temperature range 25 degree C to the boiling point. Iron and nickel, as well as the Fe-Ni-Cr alloys, showed an active-passive transition which correlates very well with the predictions of the Pourbaix diagram both with respect to M/HMO//2** minus dissolution and oxide formations. The corrosion rates increased with an increase in the temperature and NaOH concentration. In the sodium hydroxide environment nickel is the most corrosion resistant and desirable component in the Fe-Ni-Cr alloys, whereas Cr is generally deleterious.

Original languageEnglish (US)
Pages (from-to)1637-1644
Number of pages8
JournalJournal of the Electrochemical Society
Volume119
Issue number12
DOIs
StatePublished - Jan 1 1972

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