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Why the profile of etched titanium with HF-HNO3 looks like a hill, while the profile of etched titanium with HCl is U-shaped? Can you please put your source if you know it? Thank you

Note: the picture above is the profile of etched titanium with HF

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closed as unclear what you're asking by Waylander, Jon Custer, A.K., aventurin, Mithoron Jul 5 '18 at 15:59

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ What are your thoughts on this? $\endgroup$ – Waylander Jul 4 '18 at 15:53
  • $\begingroup$ Really unclear what you are asking. Have you considered the sample curvature before etching? The picture above shows it quite clearly. $\endgroup$ – Jon Custer Jul 4 '18 at 16:25