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Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6Al4V in Simulated Synovial Fluids

Cudjoe, Edward
http://orcid.org/0000-0003-3132-9397
http://rave.ohiolink.edu/etdc/view?acc_num=ysu156634015910627

Abstract Details

2019, Master of Science in Engineering, Youngstown State University, Department of Mechanical, Industrial and Manufacturing Engineering.
Total joint replacements (TJR’s) are used to replace deteriorating hip joints, knees, shoulders, wrists and fingers for millions of people in modern-day medicine. They are treatments used for patients with severe cases of arthritis or rheumatism which are mostly common in old-aged people. There was a reported 1.2 million total joint replacement surgeries, primary and revised, across the United States between the years 2012 and 2017. Recent research has pointed out the primary concern with TJR’s is the loosening of the prosthetic which further causes destruction of the bone tissue following wear corrosion and failure of the implant. In addition, there were a total of 350 000 total hip replacement surgeries in the U.S between the years 2012 and 2017. The most common type of hip replacements is metal on metal hip replacements. They are preferred because of the less total loss of material being removed from the ball and socket during articulation, low chance of dislocation and reduced chance of fracture. The most common types of metals used in Metal on Metal hip replacements are Cobalt Chromate alloys and Titanium alloys. Cobalt Chromate alloys were studied by Haynes in 1900s who showed that the basic binary Cobalt Chromate alloy exhibited high strength and low chemical reactivity. Generally, these alloys have high-wear resistance, high strength, and modulus of elasticity and high corrosion resistance which makes them useful for orthopedic implants. Titanium on the other hand is useful for orthopedic implants because of its inertness in a biochemical environment with mechanical strengths. In this thesis, modular Cobalt Chromate (Co-Cr-Mo) and Titanium (Ti6Al4V) alloys were subjected to continuous fatigue contact in a corrosive biochemical environment. The change in the passive layers of these alloys were observed by electrochemical characterizations during small displacement mechanical loading in different pH environments. Namely, Phosphate Buffer Solution (PBS) with a pH of 7.4, Sodium lactate solution which pH of 4 and 2. To further understand chemo-mechanical synergism, and damage recovery behaviors of two different oxides, a Nano-scratch based experiment was carried out in a tribochemical cell. Cyclic reciprocating motions with an alumina sphere was applied with controlled normal load in the solutions. The open circuit potential and potentiostatic polarization were used to measure the 2 polarization resistance and potential. Changes of electrochemical responses were monitored using the Gamry Potentiometer to quantitatively compare alterations of wear track area, roughness, and oxide thickness on both implant materials during mechanical wear. After thorough investigation, it can be deduced that the formation of oxide layer in the Titanium alloys occurs during fretting, after fretting and in some instances before fretting. CoCrMo however does not re-passivate during fretting but does recover its oxide layer after.
Jae Joong Ryu, PhD (Advisor)
Virgil Solomon, PhD (Committee Member)
Kyosung Choo, PhD (Committee Member)
89 p.
Biomedical Engineering; Mechanical Engineering
Tribocorrosion; CoCrMo; Ti6Al4V; Simulated Synovial Fluids

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Citations

  • Cudjoe, E. (2019). Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6Al4V in Simulated Synovial Fluids [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu156634015910627

    APA Style (7th edition)

  • Cudjoe, Edward. Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6Al4V in Simulated Synovial Fluids. 2019. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu156634015910627.

    MLA Style (8th edition)

  • Cudjoe, Edward. "Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6Al4V in Simulated Synovial Fluids." Master's thesis, Youngstown State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu156634015910627

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Youngstown State University and OhioLINK.