Electrochemical and Hot Deformation Behaviour of Co–Cr–Mo Alloys

Abstract

Co–28Cr–6Mo alloy was prepared by vacuum induction melting process and tested for electrochemical corrosion behavior in a neutral Hank’s solution at 37±1○C. The hot deformation behavior of the as cast alloy was studied using uniaxial compression tests carried out in vacuum to a true strain value of 0.4, in the temperature range of 1000 to 1200 °C and for the strain rate of 0.002, 0.01 and 0.1 s-1. The measured open circuit potential, corrosion current density and corrosion potential values for the as cast samples were -0.191 V, 4.08 x 10-6 A/cm2 and -0.301 V, respectively. Whereas, the corresponding values for the homogenized samples were -0.148V, 1.12 x 10-7 A/cm2 and -0.109 V, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy measurement techniques were used to study the microstructure of the alloy before and after the electrochemical corrosion tests and, also to know the effect of heat treatment on the mechanical and electrochemical properties of Co-28Cr-6Mo alloy.