Development of MgAl2O4 grain refiner in Al in-situ composite through H3BO3 addition

P. Chandramohan, P. A. Olubambi, R. Raghu, B. A. Obadele

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


In the present work, a novel approach has been made for synthesis of in-situ Magnesium Aluminate (MgAl2O4) particles in the Al-4Mg alloy by Boric Acid (H3BO3) precursor addition (1 wt %, 1.5 wt % and 2 wt %) during the casting process. The developed composite has been investigated for its microstructural characteristics and corrosion performance. Scanning Electron Microscopy and Energy Dispersive Spectroscopy examination revealed the formation of MgAl2O4 particles in the composite. Potentiodynamic polarization corrosion experiments were performed on the Al-4Mg/H3BO3 composite specimens (1 wt %, 1.5 wt % and 2 wt %) in three different medium (3.5 % Sodium Chloride-NaCl, 1 M Sulphuric Acid-H2SO4 and 1 M Hydrochloric Acid-HCl). Corrosion results showed that Al-4Mg/1.5 wt % H3BO3 composite specimen exhibited better corrosion resistance in 3.5 % NaCl, 1 M H2SO4 and 1 M HCl medium due to the significant grain refinement produced by MgAl2O4 particles. The developed composite with better corrosion properties can be utilized for marine and naval application.

Original languageEnglish
Article number012039
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - 8 Nov 2019
EventConference of the South African Advanced Materials Initiative 2019, CoSAAMI 2019 - Vanderbijlpark, South Africa
Duration: 22 Oct 201925 Oct 2019

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering


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