This study addresses the influence of Cr concentration on the corrosion resistance of Co73.5Si13.5B9Nb3Cu1 amorphous material in simulated industrial environments slightly contaminated with SO2 (0.1 M sodium sulfate [Na2SO4]). Anodic polarization measurements were carried out to study susceptibility to passivation. The corrosion kinetics was analyzed using direct current (DC) electrochemical techniques. Every test was carried out with the same material in different states: amorphous, nanocrystalline, and crystalline. The study also focused on changes in the magnetic properties of the material as a result of Cr addition and exposure to an aggressive medium. Corrosion resistance depends mainly on the Cr concentration and the material state (amorphous, crystalline, or nanocrystalline). Both an increase of Cr concentration and nanocrystalline state improved the corrosion resistance.

Subject
X-ray diffraction, Materials, Corrosion rate, Glass, Sodium sulfate, Passive films, Anodic polarization curves, Corrosion products, Film formation, Passivation, Immersion, Corrosion resistance, Samples
Keywords:
amorphous structures, anodic polarization, cyclic polarization, metallic glass, nanocrystalline materials, passivity, polarization resistance, sulfur
NACE International
2002
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