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Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6AL4V Under the Effect of Normal Load

Patel, Mihir V.
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559649164807102

Abstract Details

2019, Master of Science in Engineering, Youngstown State University, Department of Mechanical, Industrial and Manufacturing Engineering.
Prosthetic implants have helped to restore mobility and increase the function of diseased joints. The modular design of joint replacement is most widely used due to the ease of anatomic customization. Modular interface such as the stem-head interface of total hip replacements is continuously subjected to wear and corrosion. CoCrMo and Ti6Al4V ELI are the most widely used metals in Total Hip Joint Replacement implant devices because of their long life, high mechanical strength, and electrochemical stability. Tribocorrosion behavior study of both metals is essential to predict the actual performance of these metals in implant and to judge which metal is better over others. The scratch test and electrochemistry of corrosion is performed on both metals to see wear behavior at varying Normal load. Three different loads were used on both metals to get a broader view. Open Circuit Potential (OCP) and Potentiostatic Polarization Resistance were measured to analyze corrosion behavior of metal along with mechanical wear by scratching the flat surface with the micromotion of the spherical ball. Potentiodynamic Polarization Resistance (PPR) were measured for corrosion behavior during an ideal condition when there is no mechanical wear. OCP measurement revealed that Ti6Al4V ELI exhibits depassivation for first few cycles of scratch but started repassivation soon with periodic depassivation. While on CoCrMo depassivation was more than repassivation resulting in continuous small drops during fretting. Ti6Al4V ELI showed better corrosion resistance at all loads during fretting. After fretting was ceased, repassivation was faster in CoCrMo than Ti6Al4V ELI. The coefficient of friction (COF) measurement during scratching is beneficial for predicting the material removal and wear debris arrest between contacting surface. PPR measurement yielded a wider range of passive zone for Ti6Al4V ELI when swept through negative to positive voltage. Potentiostatic Polarization at three different voltage resulted in an increase in current density from baseline only in CoCrMo along with scratch at three loads. Ti6Al4V ELI was passive at all three voltage and all three loads. CoCrMo showed a higher change in current density at a higher voltage and load.
Jae Joong Ryu, PhD (Advisor)
Virgil Solomon, PhD (Committee Member)
Kyosung Choo, PhD (Committee Member)
106 p.
Mechanical Engineering
Tribocorrosion; Metallic implants; CoCrMo; Ti64

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Citations

  • Patel, M. V. (2019). Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6AL4V Under the Effect of Normal Load [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559649164807102

    APA Style (7th edition)

  • Patel, Mihir. Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6AL4V Under the Effect of Normal Load. 2019. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559649164807102.

    MLA Style (8th edition)

  • Patel, Mihir. "Tribocorrosion Behavior of Metallic Implants: A Comparative Study of CoCrMo and Ti6AL4V Under the Effect of Normal Load." Master's thesis, Youngstown State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559649164807102

    Chicago Manual of Style (17th edition)

ysu1559649164807102
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This open access ETD is published by Youngstown State University and OhioLINK.