Characterization of passive film formed on 304 SS in simulated alkaline water chemistries containing sulfur at 300°C

Abstract

Passivity degradation of 304 stainless steel (SS) in simulated alkaline water chemistries at 300°C was investigated using polarization curve, scanning electron microscope, time-of-flight secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). Experimental results indicated that 304, SS was selfpassive in the test solution and the thickness of passive film was about 500 nm. Hydroxide was enriched in the outer layer whereas oxide was enriched in the inner layer. Sulfur in thiosulfate could be reduced into lower valence of sulfur and enter the passive film so that the composition of passive film was modified by sulfur. Fe and Cr were enriched in the passive film whereas Ni was depleted in the passive film.

Keywords

passive film / 304 stainless steel / thiosulfate / SIMS / polarization curve

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