Characterization of Tribocorrosion Behaviour of CoCr Alloy by Electrochemical Techniques in Several Corrosive Media
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Substitution of hip and knee joints by CoCr alloys is in great demand due to their high wear resistanceand good biocompatibility. Understanding of tribocorrosion in joint replacements requires study of variablessuch as coefficient of friction and the choice of a proper corrosive medium in wear-corrosion testscarried out in the lab. The objective of this study was to characterize tribocorrosion behaviour of CoCralloy with low (LCCoCr) and high carbon (HCCoCr) contents in several corrosive media: NaCl, PhosphateBuffer Solution (PBS), and PBS with hyaluronic acid (PBS-HA). Tribocorrosion tests were carried outon a pin-on-disk tribometer with an integrated electrochemical cell. A normal load of 5N was appliedon the alumina ball counterpart at a rotation rate of 120 rpm. Coefficient of friction (COF) was measuredand tribocorrosion behaviour was characterized by in situ application of electrochemical techniques. HCCoCr alloy immersed in PBS-HA showed the best tribocorrosion behaviour with the lowest COF. In this case, in situ measurement of corrosion potential and the impedance data under wear corrosionprocess showed an active state while passive film was continuously destroyed without possibility ofregeneration.
Abstract
Substitution of hip and knee joints by CoCr alloys is in great demand due to their high wear resistanceand good biocompatibility. Understanding of tribocorrosion in joint replacements requires study of variablessuch as coefficient of friction and the choice of a proper corrosive medium in wear-corrosion testscarried out in the lab. The objective of this study was to characterize tribocorrosion behaviour of CoCralloy with low (LCCoCr) and high carbon (HCCoCr) contents in several corrosive media: NaCl, PhosphateBuffer Solution (PBS), and PBS with hyaluronic acid (PBS-HA). Tribocorrosion tests were carried outon a pin-on-disk tribometer with an integrated electrochemical cell. A normal load of 5N was appliedon the alumina ball counterpart at a rotation rate of 120 rpm. Coefficient of friction (COF) was measuredand tribocorrosion behaviour was characterized by in situ application of electrochemical techniques. HCCoCr alloy immersed in PBS-HA showed the best tribocorrosion behaviour with the lowest COF. In this case, in situ measurement of corrosion potential and the impedance data under wear corrosionprocess showed an active state while passive film was continuously destroyed without possibility ofregeneration.
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