Fig. 6From: A Review on the Electrochemically Self-organized Titania Nanotube Arrays: Synthesis, Modifications, and Biomedical ApplicationsTypical current time curve under a constant voltage in electrolytes containing fluoride. The transient can be divided into three distinct regions (I–III). (I) In the first part, there is a sharp current decay. (II) In the second part, the current begins to rise again with a time lag. (III) In the third part, the current reaches a steady state reproduced from ref. [51]Back to article page