Evaluation of Medical Equipment/Implant Materials
Evaluation of Corrosion Resistance of Metallic Biomaterials
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Electrochemical measurement of biomaterials required in pharmaceutical applications, etc.
Reference Standards for Evaluation of Corrosion Resistance of Metallic Biomaterials
JIS T 0302: "Testing method for corrosion resistance of metallic biomaterials by anodic polarization measurement"
Test performed for anodic polarization measurement as a corrosion resistance evaluation method for metallic biomaterials in an environment simulating in-vivo environment.
Enables comparison of the test material with conventional metallic biomaterials (e.g., artificial bone, artificial joints, etc.).
JIS T 0305: "Testing method for galvanic corrosion in pseudo physiological solution"
Test for evaluating galvanic corrosion (contact corrosion between dissimilar metals) in a solution simulating in-vivo environment. Tests of surface-modified specimens can also be performed for screening of candidate materials.
Measuring Equipment
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Electrochemical measuring instrument -
Sample electrode taken from an artificial joint
Examples of Corrosion Resistance Evaluation of Metallic Biomaterials
- Electrochemical measurement of artificial hip joint made of titanium alloy in physiological salt solution
- Galvanic corrosion test of stent in clinical Ringer' s solution
- Electrochemical measurement of acetabular cup made of titanium alloy in physiological salt solution
Electrochemical measurement of artificial hip joint made of titanium alloy in physiological salt solution
(Comparison of surface finishing dependence of corrosion resistance of artificial hip joints)
| Symbol | Description |
|---|---|
| Ecorr | In measurement under static condition, natural immersion potential after holding a certain time (10 min or more) in measurement solution. |
| Icrit | Maximum current density for passivation (Critical current density for passivation) |
| Ep | Passivation potential (potential corresponding to Icrit) |
| Ip | Passive current density; however, denotes potential. |
| Specimen | Ecorr | Icrit | Ep | Ip |
|---|---|---|---|---|
| With surface finishing | - 0.58V vs SCE | 0.040A⋅m2 | - 0.42V vs SCE | 0.021A⋅m2 |
| Without surface finishing (No. 600 polishing) |
- 0.59V vs SCE | 0.038A⋅m2 | - 0.43V vs SCE | 0.019A⋅m2 |
- From a comparison of the property values read from the anodic polarization curve, it can be judged that the corrosion resistance of the surface-finished product is substantially the same as that of the conventional surface-polished product.
