Article
2021

Estimation of Corrosion Rate of STARBOND–CoS Cobalt–Chromium Alloy in the NaCl Solution


L. A. Beketaeva L. A. Beketaeva , K. V. Rybalka K. V. Rybalka , A. D. Davydov A. D. Davydov
Russian Journal of Electrochemistry
https://doi.org/10.1134/S1023193521040030
Abstract / Full Text

The corrosion potential Ecorr of STARBOND–CoS alloy in the 0.5 M NaCl solution was measured for 100 h. The anodic and cathodic potentiodynamic curves were measured in the same solution after a preliminary exposure of the test specimen at the corrosion potential Ecorr for 2–100 h. The corrosion current densities icorr were determined using the method of Tafel extrapolation. It is shown that Ecorr shifts from +9 to +275 mV against a saturated silver–chloride reference electrode (sat. Ag/AgCl) and icorr decreases to 40 nA/cm2 in 100 h. These results are explained by the alloy self-passivation, which provides its high corrosion resistance. This enables one to use STARBOND–CoS alloy for fabricating implants.

Author information
  • Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    L. A. Beketaeva, K. V. Rybalka & A. D. Davydov

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