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Influence of annealing on the electrochemical behavior of finemet amorphous and nanocrystalline alloy

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Abstract

The electrochemical corrosion behavior of finemet alloy at various heat treatment temperatures was investigated. Thermal behavior and structural changes were studied using differential scanning calorimetry and X-ray diffractometry, respectively. The electrochemical corrosion of amorphous and annealed samples was investigated in 0.10 M NaOH solution using electrochemical impedance spectroscopy and linear sweep voltammetery. Changes in morphology of the samples before and after corrosion were characterized using optical microscope. The results showed that structural relaxation and nanocrystallization during the heat treatment improved corrosion behavior of the alloy. The heat-treated alloy at 650 °C showed a corrosion rate of 1.37 × 10−8 A cm−2 and a positive shift of +417 mV in the corrosion potential compared to the amorphous alloy. Also, the heat-treated alloy at 650 °C showed a higher charge transfer resistance up to 50 kΩ due to corrosion resistance, compared with amorphous sample that showed a charge transfer resistance of 0.5 kΩ.

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Authors and Affiliations

  1. Institute for Nanoscience and Technology, Sharif University of Technology, Tehran, Iran

    Hossein Asghari Shivaee

  2. Electrochemistry and Fuel Cell Lab, NSTRI, Tehran, Iran

    Ahmad Nozad Golikand & Mehdi Asgari

  3. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

    Hamid Reza Madaah Hosseini

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  1. Hossein Asghari Shivaee
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  2. Ahmad Nozad Golikand
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  3. Hamid Reza Madaah Hosseini
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  4. Mehdi Asgari
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Correspondence to Ahmad Nozad Golikand.

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Shivaee, H.A., Golikand, A.N., Hosseini, H.R.M. et al. Influence of annealing on the electrochemical behavior of finemet amorphous and nanocrystalline alloy. J Mater Sci 45, 546–551 (2010). https://doi.org/10.1007/s10853-009-3972-z

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  • DOI: https://doi.org/10.1007/s10853-009-3972-z

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