TY - JOUR
T1 - TK diagrams to determine the impact of pH variation on 3D printed CoCr alloy implant corrosion
AU - Raza, A.
AU - Deen, K. M.
AU - Asselin, E.
AU - Haider, W.
N1 - Funding Information:
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/15
Y1 - 2023/1/15
N2 - Thermo-kinetic (TK) diagrams are developed for an additively manufactured (AM) CoCr alloy in 0.1 M Na2SO4 in the pH range of 4 to 9 at a constant temperature of 37 °C. The effect of 100 ppm chloride in these solutions was also investigated. TK diagrams can be used to estimate the corrosion rate of the AM CoCr alloy as a function of solution potential and pH. For instance, based on the potentiodynamic polarization results obtained at an optimized potential sweep rate (1.0 mV/s), the passive film had reduced stability at potential > 0.2 VSHE, within 5 < pH < 7, and in the presence of 100 ppm Cl−. Similarly, the CoCr alloy has poor corrosion resistance at potentials lower than 0.8 V vs SHE within 5 < pH < 7, which may be due to the conversion of Cr(OH)3 into soluble CrOH2+ species. The TK diagrams can be used to predict the corrosion rate of CoCr alloys during changes in pH, which may be important during wound healing for implants.
AB - Thermo-kinetic (TK) diagrams are developed for an additively manufactured (AM) CoCr alloy in 0.1 M Na2SO4 in the pH range of 4 to 9 at a constant temperature of 37 °C. The effect of 100 ppm chloride in these solutions was also investigated. TK diagrams can be used to estimate the corrosion rate of the AM CoCr alloy as a function of solution potential and pH. For instance, based on the potentiodynamic polarization results obtained at an optimized potential sweep rate (1.0 mV/s), the passive film had reduced stability at potential > 0.2 VSHE, within 5 < pH < 7, and in the presence of 100 ppm Cl−. Similarly, the CoCr alloy has poor corrosion resistance at potentials lower than 0.8 V vs SHE within 5 < pH < 7, which may be due to the conversion of Cr(OH)3 into soluble CrOH2+ species. The TK diagrams can be used to predict the corrosion rate of CoCr alloys during changes in pH, which may be important during wound healing for implants.
KW - Additive manufacturing
KW - Cobalt-chrome alloys
KW - Dental implants
KW - Electrochemistry
KW - Potential sweep rate
KW - Thermo-kinetic diagrams
UR - http://www.scopus.com/inward/record.url?scp=85144608874&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2022.117087
DO - 10.1016/j.jelechem.2022.117087
M3 - Article
AN - SCOPUS:85144608874
VL - 929
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 1572-6657
M1 - 117087
ER -