TK diagrams to determine the impact of pH variation on 3D printed CoCr alloy implant corrosion

A. Raza, K. M. Deen, E. Asselin, W. Haider

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number117087
JournalJournal of Electroanalytical Chemistry
Volume929
DOIs
StatePublished - Jan 15 2023

Keywords

  • Additive manufacturing
  • Cobalt-chrome alloys
  • Dental implants
  • Electrochemistry
  • Potential sweep rate
  • Thermo-kinetic diagrams

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