期刊
CORROSION SCIENCE
卷 86, 期 -, 页码 61-70出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.04.056
关键词
Acid solutions; Stainless steel; EIS; mu-Raman spectroscopy; Mott-Schottky
资金
- Groupe Chimique Tunisien GCT from Sfax - Tunisia
Corrosion resistance of a highly alloyed austenitic stainless steel (Sanicro28) in 50 wt.% H3PO4 industrial medium containing impurities at temperatures from 20 degrees C to 80 degrees C was evaluated after different immersion times. Electrochemical measurements (polarization curves, OCP, EIS and Mott-Schottky) demonstrated that Sanicro28 passivates spontaneously. From impedance results, film thicknesses of about 1.6-4.5 nm were obtained. At low temperature, the resistance to corrosion increases with immersion time due to the formation of iron phosphate and/or chromium phosphate. At higher temperature, phosphate formed a porous polyphosphate film identified by mu-Raman. No pits are initiated on surface whatever the temperature. (C) 2014 Elsevier Ltd. All rights reserved.
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