The electrochemical anodization of zirconium in a fluoride-containing electrolyte at optimal anodic conditions, in this case, means the right amount of voltage, temperature, pH, water content, etc is associated with the competing process between anodic oxidation of the Zr metal and dissolution of the for which there are three main stages in the fabrication of the nanotube . In the initial step, there is the oxidation of the zirconium metal to form a compact oxide barrier, and this barrier inhibits the further movement of ions and this is evidenced in the reduction of the current density. However, subsequently, the oxide layer undergoes electric-assisted dissolution and chemical dissolution due to the formation of a soluble zirconium-fluoro complex that allows for porosification. These pores serve as nucleation sites for the inward formation of porous ordered anodic oxide. In the third stage, when an equilibrium is established between the rate of oxidation and dissolution, stable nanotubular arrays are formed . These processes can be monitored by measuring the current density-time curve, during the anodization and as shown in Figure the shape of the curve is similar for both sets of samples, this means that the doping with Ag did not affect the nanotube formation and further evident in the similar nanotube dimensions as observed in Figure . This result agrees with the work of Mazierski et al. where similar conclusions were made after anodizing different concentrations of silver-doped alloys of titanium. Gao et al. also reported little influence on the geometry, specifically the diameter of the titania nanotube when they anodized AgTi coating deposited by magnetron sputtering on Ti. However the difference for both samples is the magnitude of the current density, and that can explain the formation of Ag 2 O and Ag NP in addition to the ZrNT for the modified sample. The CD (current density) which is a function of the amount of moving ions in response to the applied potential is slightly higher for Ag -ZrNT (80 A/m 2 compared to 60 A/m 2 for unmodified ZrNT) indicating more dissolution of the oxide layer as soluble flurocomplexes . Therefore it implies that for the modified ZrNT in addition to the formation of soluble zirconiumfluoro complexes, AgF complexes are also formed and have good solubility in the electrolyte. The formation of Ag NP can be due to the electrochemical reduction of Ag + ion to metal Ag 0 since the reduction potential of Ag + /Ag 0 equals (E•= 0.7994 V) . Furthermore, Ag 2 O in an aqueous environment has been shown to decompose at room temperature to AgNP . Hence it is plausible that Ag 2 O formed underwent thermal decomposition to AgNPs.