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Vol.46, No.4, 209 ~ 217, 2008
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| Title |
| Effect of Cobalt Contents on the Biocompatibility and Corrosion Properties of Fe-31Cr-27Ni-1.6Mo-1.5W-0.26N Alloy |
| 장순근 Soon Geun Jang , 유영란 Young Ran Yoo , 남희수 Hee Soo Nam , 심규태 Gyu Tae Shim , 김정구 Jung Gu Kim , 김영식 Young Sik Kim |
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| Abstract |
| Super austenitic stainless steels shows the high PRE (Pitting Resistance Equivalent) number and the good corrosion resistance. This work controlled the Co contents in Fe-31Cr-1.7Mo-27Ni-0.25N alloys to elucidate the effect of cobalt contents on the biocompatibility and corrosion resistance. Increasing Co contents, the hardness of the annealed alloys tends to be reduced. In aged alloys, cobalt decreased the increments of hardness by aging treatment. Cobalt decreased the critical pitting temperature (CPT) in 6% FeCl3 + 1% HCl solution, but improved the anodic polarization behavior in Hanks` balanced salt solution and artificial saliva solution. Repassivation rate in artificial body solutions was improved by increasing cobalt contents, but didn`t show the linear relationship to PRE number of the alloys. The experimental alloys showed the non-cytotoxicity because of its high corrosion resistance. |
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| Key Words |
| super austenitic stainless steel, cobalt, biocompatibility, pitting, anodic polarization, repassivation |
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