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Effect of Electropolishing Process on Corrosion Resistance of Co-Cr Alloy

Co-Cr alloy의 전해연마에 따른 부식의 영향

Park, Je-Min;Kim, Wan-Cheol
박제민;김완철

  • Received : 2010.06.09
  • Accepted : 2010.08.30
  • Published : 2010.08.31

Abstract

The Co-Cr alloys have clinical histories as dental and orthopaedic implants, and recently as cardiovascular stent applications because they exhibit a high elastic modulus and radiopacity. In order to improve their mechanical and corrosion resistance, electropolishing is employed as the final process. Electropolishing, an anodic dissolution process in the transpassive state, is sensitively affected by process conditions such as current density, machining time, and electrode gap. In this study, the effect of the electropolishing conditions on surface roughness and corrosion resistance is investigated for Co-Cr alloys (L605). The most smooth surface is obtained when electropolishing is performed at 15-20 V for 15-30 sec with a electrode gap of 3.5 mm. It is found out that electropolishing reduces corrosion rate about one-tenth as much.

Keywords

Electropilishing;L605;Corrosion;Surface roughness

References

  1. P. Poncin, C. Millet, J. Chevy, Materials and Processes for Medical Devices Conference, 25 (2004) 1276.
  2. H.-Y. Lin, J. D. Bumgardner, Biomaterials, 25 (2004) 1233. https://doi.org/10.1016/j.biomaterials.2003.08.016
  3. I. Czako-Nagy, M. K. El-Sharif, A. Vertest, C. U. Chisholm, Electrochemica Acta, 39 (1994) 801. https://doi.org/10.1016/0013-4686(94)80030-8
  4. Ankur Raval, Animesh Choubey, Chhaya Engineer, Devesh Kothwala, Mater. Sci. Eng. A, 286 (2004) 331.
  5. T. Hryniewicz, R. Rokicki, K. Rokosz, Mater. Lett., 62 (2008) 3073. https://doi.org/10.1016/j.matlet.2008.01.130
  6. A. V. Datye, M. Jaramillo, K. H. Wu, Challenges and Opportunities for Engineering Education, Research and Development, 2 (2004) 342.
  7. W. Walke, Z. Paszenda, J. Tyrlik-Held, Journal of Achievement in Materials and Manufacturing Engineering, 16 (2006) 789.