Pitting Corrosion Behavior of Stainless Steels in NaCl Solutions under Heat Transfer Conditions

Abstract

The pitting corrosion potentials of SUS 304, SUS 316, and E-Brite 26-1 stainless steels under both isothermal and heat transfer conditions in NaCl solutions were measured. The NaCl concentration was varied in the range 0.01-26% and the solution temperature was varied from 50°C to the boiling point under normal atmospheric pressure. The pitting potentials thus obtained were correlated well with the surface temperature of the specimen under heat transfer, but independent of the solution temperature. The effect of NaCl concentration in the vicinity of the surface was also investigated mostly in dilute NaCl solutions under the heat transfer conditions at the temperature higher than the boiling point.