Non-monotonic influence of a magnetic field on the electrochemical behavior of Fe sub(78)Si sub(9)B sub(13 ) glassy alloy in NaOH and NaCl solutions

• Published in: International journal of minerals, metallurgy and materials Vol. 21; no. 10; pp. 1009 - 1018
• Main Authors: Zhang, Hong-di, Li, Xiao-yu, Pang, Jing, Yin, Li-juan, Ma, Hai-jian, Li, Ying-jie, Liu, Yan, Wang, Wei-min
• Format: Journal Article
• Language: English
• Published: 01.10.2014
• Subjects: Corrosion; Glassy; Magnetic fields; Microstructure; Pits; Polarization; Polypropylenes; Scanning electron microscopy
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-014-1002-x

The corrosion behavior and microstructure of Fe sub(78)Si sub(9)B sub(13 ) glassy alloy in NaOH and NaCl solutions under a 0.02-T magnetic field were investigated through electrochemical testing and scanning electron microscopy (SEM). The current-density prepeak (PP) in the anodic polarization curves in low-concentration NaOH solutions (classified as type I) tends to disappear when the NaOH concentration is increased to 0.4 mol/L and the magnetic field is applied. Under the magnetic field, the height of the second current-density peak is increased in low-concentration NaOH solutions (type I) but decreased in high-concentration NaOH solutions (type II). The non-monotonic effect of the magnetic field was similarly observed in the case of polarization curves of samples measured in NaCl solutions. Ring-like corroded patterns and round pits are easily formed under the magnetic field in NaOH and NaCl solutions. These experimental results were discussed in terms of the magnetohydrodynamic (MHD) effect.