Electrochemical surface treatment method and electrochemical surface treatment device for porous metal material

Abstract

The invention discloses an electrochemical surface treatment method and an electrochemical surface treatment device for a porous metal material. The method comprises the following steps: on the basis of applying a compact metal material which is the same as a to-be-treated porous metal material as a working electrode, utilizing an electrochemical working station to measure a steady-state cathode polarization curve of the compact metal material in the working electrolyte, determining a platform zone of a current-potential curve, and obtaining limitation diffusion-controlled electrochemical treatment condition of electro-deposition reaction; on the basis of applying to-be-treated porous metal material as a working electrode, enabling the working electrolyte to perform single-direction or circulating flow in an electrolytic cell; applying the determined limitation diffusion-controlled electrochemical treatment condition to carry out electrochemical surface treatment on the porous metal material until a set value is reached. The electrochemical surface treatment method disclosed by the invention can be used for treating the inner surface of the porous metal material more effectively, so that the outer-layer surface and inner-layer surface of the porous structure of the metal material are more uniform in treatment effect, and therefore, a better electro-deposition treatment effect or electro-polishing effect is obtained.

Description

technical field [0001] The invention relates to an electrochemical surface treatment method and device, in particular to an electrochemical surface treatment method and device for porous metal materials. Background technique [0002] Porous metal materials are widely used, such as medical titanium and titanium alloys have been widely used as human hard tissue replacement materials. However, when complex stress conditions are applied to the bone and joint system, it is required that the loaded artificial bone has mechanical properties more similar to the original bone and can form a firm biological fixation with the original bone. In this case, porous titanium and its alloys show biomimetic advantages over their compact counterparts: by changing the pore parameters of the alloy to adjust the strength and elastic modulus of the material, mechanical properties that better match the replaced bone tissue can be obtained ; The compressibility and porous structure of the porous al...

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Problems solved by technology

However, in the process of electrochemical and chemical treatment, due to the resistance of the transmission process such as the internal current density and solution concentration of the porous structure, the effective overpotential and the concentration of the reactant are greatly reduced, and the porous structure is only along the (electrode) thickness direction. About 10-30% can be effectively treated

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