Electrochemical behavior and morphology of selected sintered samples of Mg₆₅Zn₃₀Ca₄Pr₁ alloy

Abstract

In order to investigate the effect of the milling time on the corrosion resistance of the Mg₆₅Zn₃₀Ca₄Pr₁ alloy, powders of the alloy were prepared and milled for 13, 20, and 70 hours, respectively. The samples were sintered using spark plasma sintering (SPS) technology at 350◦C and pressure of 50 MPa. The samples were subjected to potentiodynamic immersion tests in Ringer’s solution at 37◦C. The obtained values of Ecorr were –1.36, –1.35, and –1.39 V, with polarization resistance Rp = 144, 189, and 101 Ω for samples milled for 13, 20 and 70 h, respectively. The samples morphology showed cracks and pits, thus signaling pitting corrosion.