Corrosion Behaviour of Mg-Zr Alloy in Stimulated Body Fluid

Abstract

The Mg-Zr alloy is prepared through powder metallurgy method. The corrosion behavior of Mg-Zr alloy, with various sintering temperature, in stimulated body fluid was studied at 37°C, using immersion and electrochemical corrosion tests. The application of this study is the human body bone implants. The characterization of the alloy was carried out through optical microscopy, XRD (X-ray diffraction) and SEM (scanning electron microcopy). The obtained values reveal that, the crystallite sizes reduce by the increasing sintering temperatures and at the same time, the corrosion rates decrease significantly.

Experimental Study on Hybrid Magnesium Composites for Human Bone Implants

“…After, 168 Hrs the samples were cleaned by mixed Cro3 and AgCrO4 solution followed by acetone wash to remove the debris. After wash, the samples were weighed and calculated its corrosion rate using the equation 1 [11]. The SBF solution constituents are tabulated in the table 1.…”

“…The scan rate used for this study was 1 mV s -1 with the room temperature. The corrosion rate was calculated from tafel electrochemical measurement using the equation (3) [11].…”

“…And, the composite forming techniques such as pressing and extrusion methods also improved their properties [12][13][14]. Recently researchers were used titanium oxide (TiO2) as a reinforcing element for preparing Mg composite using powder metallurgy method and proved the incorporation of the same could enhances the strength of the Mg composite than the pure form of Mg [11,15,16]. The microstructure alteration could be done through recrystallization of grains and precipitation of the same occurring during hot extrusion process caused the formation of intermetallic phases [15].…”