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Improving the biomineralization activity of Zr-based amorphous alloys is key to advancing their use in implant materials. A nanoscale 3D porous structure was synthesized on the surface of Zr-based amorphous alloy by electrochemical dealloying in a ChCl-Thi DES. Cu and Al have the lowest corrosion potential in the DES, so the main elements eluted during dealloying are Cu and Al. After dealloying, the surface of the Zr-based amorphous alloy remained essentially amorphous, and several crystalline phases of NiZr 2 , Al 3 Ti, and CuZr 2 formed simultaneously. Among the amorphous phases, Cu and Ni were present in the form of simple substances, while Zr, Al, and Ti were oxidized. The formation of the porous structure mainly included the two processes of pitting corrosion and dealloying. The pitting corrosion was controlled by Cl-, which can destroy the passivation film. In the dealloying process, thiourea played a leading role in the dissolution of active metals. A porous surface structure is beneficial for improving the biomineralization activity of Zr-based amorphous alloys. • A nanoscale 3D porous structure was synthesized on the surface of Zr-based amorphous alloy by electrochemical dealloying in a ChCl-thiourea DES. • A porous surface structure is beneficial for improving the biomineralization activity of Zr-based amorphous alloys. • It is different from aqueous solution that Cu have the lowest corrosion potential in ChCl-thiourea DES. [ABSTRACT FROM AUTHOR]

In this study, a nanoscale 3D porous structure is rapidly synthesized on the surface of a Zr-based BMG by dealloying in solutions containing Cl− and F−. The influence of the porous surface structure the electrolyte on the preparation of the porous surface structure is studied. The Zr-based BMG is more likely to be passivated when F− is added to the HCl solution. The corrosion potential gap between the five components in the alloy increases after the addition of F−. The phase transformation and structure formation of a Zr-based BMG during dealloying are studied. The main dissolved elements in the dealloying process are Zr, Ti, and Al. Cu 10 Zr 7 , Zr 2 Ni 7 and AlTi 3 are the main crystal phases after dealloying, but the Zr-based BMG remains dominated by amorphous phases. The formation of the porous structure can be divided into two stages, the pitting corrosion process and the dealloying process, and these two processes are dominated by Cl− and F−, respectively. A porous surface structure is beneficial to improve the biomineralization activity of Zr-based BMGs. • A method for quickly synthesizing porous structure on the Zr-based BMGs surface has been developed. • The main process of the porous structure formation is the pitting corrosion and the dealloying. • The porous structure is beneficial to improve the biomineralization activity of Zr-based BMGs. [ABSTRACT FROM AUTHOR]