Characterization of Passive Film Formed on 304 SS in Simulated Alkaline Water Chemistries Containing Sulfur at 300

Passivity degradation of 304 stainless steel（SS） in simulated alkaline water chemistries at 300℃ 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 tha...

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Bibliographic Details
Published in:天津大学学报：英文版 2015 (6), p.554-561
Main Author: 夏大海 孙毅飞 范洪强
Format: Article
Language:English
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Summary:Passivity degradation of 304 stainless steel（SS） in simulated alkaline water chemistries at 300℃ 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.
ISSN:1006-4982
1995-8196