Abstract
The work presented in this paper is based on the study of electrochemical corrosion behavior of Co–Cr–Mo alloy as a function of the concentration of simulated biological fluid (hyaluronic acid), the influence of Cl- on hyaluronic acid (HA) and machining configurations. For the electrochemical tests, electrochemical impedance spectroscopy and potentiodynamic polarization test were undertaken. With the increase in HA concentration, high metal dissolution was observed. Whereas with the addition of NaCl in the solution, the corrosion resistance of the sample was enhanced. Also, an increase in surface roughness of sample surface HA caused a decrease in icorr. This is due to the adhesion property of the HA on the sample surface. X-ray photoelectron spectroscopy was executed to analyze the passive film formed due to HA and NaCl on Co–Cr–Mo. Scanning electron microscope were carried out to analyze the surface morphology. Energy dispersive spectroscopy shows lower Cr at the pit. The study reveals the adsorption of HA on the surface. This adsorbed HA on the surface caused the metal dissolution and hence initiation sites for pitting. When compared with the sample in HA + NaCl solution, better passive film property was observed to cause better corrosion resistance.
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