We observe some cracks among the nanotubes which are formed on the surface of the Ti alloy after anodic oxdation. What could be the cause of this problem?
hi
Before anodic oxdation did the machining operations take place on the material?
Growth stress! In the absence of any details on the experimental conditions, growth stress is one of the most probable causes. Decrease the anodization potential or time or both! Other reason could be that the substrate is thinner and bends due to the growth stress, that leads to cracking. Increase in fluoride concentration (if used) may help decrease the cracking events. Annealing of the substrate (if the alloy is rolled or hardened) before polishing may help.
Thank you Krishnan Raja . I will take into consideration your suggestions. Anodization potential is 30 V. We decreased the time however the same problem occured. We can also decrease the potential as you suggested. The thickness of the substrate is 2 mm, so there is no visible bending. In the literature, I haven't encountered the same problem in the studies in which the same parameters were applied as in our study.
It could also be possible that your electrolyte concentration is high for 30 V potential. try reducing the concentration and anodizing duration.
It can be due to number of reasons:
1. Electrolyte age
2. Water/fluoride content
3. Voltage, current, time
4. Surface topography of the substrate
5. Cleaning or sterilization protocol (or annealing?)
6. Substrate shape or geometry
Dear:
I already have the same problem after performed the sterilization process or annealing. The post-treatment can be a factor.
However, I totally agree with the comments provided by K. Raja and K. Gulati, taking into account all the mentioned items.
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