A Study on the Corrosion and Tribocorrosion Behavior of Al-30 Vol.% B4C Composite Produced by Mechanical Milling and Hot Pressing

MİNDİVAN H.

Journal of Materials Engineering and Performance, vol.30, no.12, pp.9140-9148, 2021 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 12
  • Publication Date: 2021
  • Doi Number: 10.1007/s11665-021-06127-y
  • Journal Name: Journal of Materials Engineering and Performance
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.9140-9148
  • Keywords: aluminum, boron carbide, corrosion, matrix composite, metal, tribocorrosion
  • Bilecik Şeyh Edebali University Affiliated: Yes

Abstract

© 2021, ASM International.The present work aims to study the corrosion and tribocorrosion behaviors of pure Al and Al-30 vol.% B4C fabricated by a combination of mechanical milling and hot-pressing processes. Structural analysis and phase composition of the pure Al and the Al-30 vol.% B4C composite were evaluated by field emission-scanning electron microscopy and x-ray diffractometry, respectively. The corrosion behavior was investigated using electrochemical impedance spectroscopy and potentiodynamic polarization in a 3.5 wt.% NaCl solution. Tribocorrosion tests were performed under an open-circuit potential in the same solution with a ball-on-flat configuration, and Al2O3 balls were used. Electrochemical studies revealed that the composite with 30 vol.% B4C presented lower resistance to corrosion as compared to the pure Al evidenced by a decrease on the corrosion potential, an increase on the corrosion current density and a smaller diameter of the semicircle presented in the Nyquist diagram. The results from the potentiodynamic polarization measurements showed that pure Al corroded at 58% slower rate when compared to the corrosion rate of Al-30 vol.% B4C composite. However, tribocorrosion tests showed that B4C particle addition to the Al matrix decreased the wear volume of the resulted composite from 1.48 to 0.03 mm3.