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Controlling corrosion rate of Magnesium alloy using powder mixed electrical discharge machining

Razak, M.A. and Rani, A.M.A. and Saad, N.M. and Littlefair, G. and Aliyu, A.A. (2018) Controlling corrosion rate of Magnesium alloy using powder mixed electrical discharge machining. IOP Conference Series: Materials Science and Engineering, 344 (1).

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Abstract

Biomedical implant can be divided into permanent and temporary employment. The duration of a temporary implant applied to children and adult is different due to different bone healing rate among the children and adult. Magnesium and its alloys are compatible for the biodegradable implanting application. Nevertheless, it is difficult to control the degradation rate of magnesium alloy to suit the application on both the children and adult. Powder mixed electrical discharge machining (PM-EDM) method, a modified EDM process, has high capability to improve the EDM process efficiency and machined surface quality. The objective of this paper is to establish a formula to control the degradation rate of magnesium alloy using the PM-EDM method. The different corrosion rate of machined surface is hypothesized to be obtained by having different combinations of PM-EDM operation inputs. PM-EDM experiments are conducted using an opened-loop PM-EDM system and the in-vitro corrosion tests are carried out on the machined surface of each specimen. There are four operation inputs investigated in this study which are zinc powder concentration, peak current, pulse on-time and pulse off-time. The results indicate that zinc powder concentration is significantly affecting the response with 2 g/l of zinc powder concentration obtaining the lowest corrosion rate. The high localized temperature at the cutting zone in spark erosion process causes some of the zinc particles get deposited on the machined surface, hence improving the surface characteristics. The suspended zinc particles in the dielectric fluid have also improve the sparking efficiency and the uniformity of sparks distribution. From the statistical analysis, a formula was developed to control the corrosion rate of magnesium alloy within the range from 0.000183 mm/year to 0.001528 mm/year. © Published under licence by IOP Publishing Ltd.

Item Type:Article
Impact Factor:cited By 0; Conference of 3rd International Conference on Science, Technology, and Interdisciplinary Research, IC-STAR 2017 ; Conference Date: 18 September 2017 Through 20 September 2017; Conference Code:135947
Uncontrolled Keywords:Corrosion rate; Degradation; Efficiency; Electric discharge machining; Electric discharges; Integrated circuits; Magnesium powder; Spark cutting; Stars, Biomedical implants; In-vitro corrosions; Localized temperature; Machined surface quality; Magnesium and its alloys; Powder mixed electrical discharge machining; Spark erosion process; Surface characteristics, Magnesium alloys
ID Code:21611
Deposited By: Ahmad Suhairi
Deposited On:25 Sep 2018 00:55
Last Modified:25 Sep 2018 00:55

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