Investigation on Hardness and Corrosion Properties of Graphene Nanoplatelets Reinforced Magnesium Composite

Abang Mohamad Harith, Beniamin (2023) Investigation on Hardness and Corrosion Properties of Graphene Nanoplatelets Reinforced Magnesium Composite. Masters thesis, Universiti Malaysia Sarawak.

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Abstract

Magnesium (Mg) has been used for many decades in various applications. This metal has attractive mechanical properties such as strength and hardness. Although Mg is lightweight and has high strength, one of the major limiting factors in using Mg includes its corrosion resistance. In the natural environment, the poor corrosion resistance of Mg and Mg alloys in saline and physiological environments remains a constant threat for Mg and Mg alloys as potential automotive parts, aerospace materials or biomedical implants. This research is done to study the hardness and corrosion properties of Mg and Mg-based composites. The hardness was determined using the Vickers microhardness test. Based on the results, Mg0.2%Mn%6%Zn-1% GNPs had the highest hardness at 48 HV, followed by Mg0.2%Mn%6%Zn-0.5% GNPs at 45 HV, Mg0.2%Mn%6%Zn at 44 HV, and HP Mg at 34 HV. Increasing GNP content with zinc and manganese reinforcement is important for improving hardness in sintered Mg-based GNPs composites. An immersion test on GNP-reinforced Mg composites showed that Mg0.2%Mn%6%Zn-1% GNPs had the highest corrosion resistance (PW=17.546mm/y), followed by Mg0.2%Mn%6%Zn-0.5% GNPs (PW=19.770mm/y), Mg0.2%Mn%6%Zn (PW=22.958mm/y), and HP Mg (PW=90.3146mm/y). GNPs also lowered the corrosion rate in saline solution. Corrosion morphology and type were determined by 3D optical microscope, SEM, and EDX. Overall, this study has managed to fabricate Mg-based composites using the powder metallurgy method. Adding GNP as reinforcement has increased hardness and corrosion properties significantly, thus proving the strengthening effect of corrosion resistance by GNPs in Mg-based composites.

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