Loading...

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

Asghari Shivaee, H ; Sharif University of Technology

1544 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s10853-009-3972-z
  3. Abstract:
  4. 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
  5. Keywords:
  6. Amorphous and nanocrystalline alloys ; Amorphous samples ; Annealed samples ; Before and after ; Charge transfer resistance ; Corrosion behavior ; Corrosion potentials ; Electrochemical behaviors ; Electrochemical corrosion behavior ; Finemet ; Finemet alloys ; Heat treatment temperature ; NaOH solutions ; Optical microscopes ; Positive shift ; Structural change ; Thermal behaviors ; X ray diffractometry ; Amorphous alloys ; Cerium alloys ; Charge transfer ; Corrosion rate ; Corrosion resistance ; Corrosive effects ; Differential scanning calorimetry ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Heat resistance ; Heat treatment ; Ion exchange ; Mass transfer ; X ray diffraction analysis ; Nanocrystalline alloys
  7. Source: Journal of Materials Science ; Volume 45, Issue 2 , 2010 , Pages 546-551 ; 00222461 (ISSN)
  8. URL: http://link.springer.com/article/10.1007%2Fs10853-009-3972-z