Optimizing the defensive characteristics of mild steel via the electrodeposition of Znsingle bondSi3N4 reinforcing particles.

AKANDE, I.G and Oluwole, O. O. and Fayomi, O. S. I (2019) Optimizing the defensive characteristics of mild steel via the electrodeposition of Znsingle bondSi3N4 reinforcing particles. Defense Technology, 15. pp. 526-532.

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Abstract

The effect of ZneSi3N4deposition prepared via direct electrolytic co-deposition on mild steel was studiedas a result its inherent vulnerability to corrosion in an aggressive environment and failure on theapplication of load. The experiment was conducted varying the mass concentration of silicon nitride(Si3N4) between 7 and 13 g at cell voltage of 0.3 and 0.5 V, at constant temperature of 45�C. The mor-phologies of the coated surfaces were characterized using high resolution Nikon Optical Microscope andScanning Electron Microscope (SEM) revealing that the particles of the ZneSi3N4were homogeneouslydispersed. The corrosion behaviour was studied using potentiodynamic polarization technique in 3.65%NaCl solution and the microhardness was examined using Brinell hardness testing technique. The resultof the corrosion experiment confirmed an improved corrosion resistance with a reduction in corrosionrate from 9.7425 mm/year to 0.10847 mm/year, maximum coating efficiency of 98.9%, maximum polar-ization resistance of 1555.3Uand a very low current density of 9.33�10�6A/cm2. The negative shift inthe Ecorrrevealed the cathodic protective nature of the coating. The microhardness was also found tohave increased from 137.9 HBN for the unmodified steel to a maximum value of 263.3 HBN for the0.5Zne13Si3N4coated steel representing 90.9% increment in hardness as a result of the matrix grainrefining and dispersion-strengthening ability of the incorporated Si3N4particles

Item Type:	Article
Uncontrolled Keywords:	Polarization Corrosion Microhardness Coating Composite Matrix
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
Depositing User:	Mrs Hannah Akinwumi
Date Deposited:	23 Sep 2020 14:22
Last Modified:	23 Sep 2020 14:22
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/13621

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