Controlled surface mechanical property and corrosion resistance of ZK60 magnesium alloy treated by zirconium ion implantation

Abstract

In order to improve the surface properties and satisfy the controlled degradation of biomedical magnesium, Zr ion implantation was conducted on ZK60 magnesium with different doses in the range from 1×10 16 to 5×10 16 ions cm −2 and an accelerating voltage of 40 kV. The Zr ion concentration and displacement damage were simulated by the Stopping and Range of Ions in Matter (SRIM), the surface morphologies, structure, composition, surface mechanical properties and corrosion resistance in simulated body fluid were investigated using atomic force microscope, fieldemission scanning electron microscopy, X-ray photoelectron spectroscopy, nano-indentation, electrochemical experiments and the hydrogen evolution tests. The results indicated that the distribution of the implanted Zr concentration and displacement damage can be accurately adjusted through controlling the implanted doses, the ZK60 surface becomes smoother after Zr ion implantation along with the reduced roughness at specific doses. When the dose is 2×10 16 ions cm −2 , a gradient modified layer mainly composed of MgO, ZrO 2 and Zr, in thickness greater than 120 nm, formed on the near-surface of ZK60 after Zr ion implantation. Besides, it also possesses the largest hardness and modulus, the lowest corrosion current density and hydrogen evolution volume, indicating that the surface mechanical properties and corrosion resistance of ZK60 can be effectively improved by Zr ion implantation. Additionally, the modification mechanisms were also discussed.

Xenon Ion Implantation Induced Surface Compressive Stress for Preventing Dendrite Penetration in Solid‐State Electrolytes

“…In the practice of ion implantation, the increasing atomic displacements generally result in the increase of compressive stress at the surface of the target. [40,41] Thereby, there would be no sufficient surface compressive stress for the LLZTO and LLZTO-L samples, and the improved lifespan of LLZTO-M and LLZTO-H samples could be attributed to the ion implantation induced surface compressive stress. However, excessive ion implantation dose above the amorphization threshold value could lead to glass transition or complete amorphization of the target material.…”

Biomedical Alloys and Physical Surface Modifications: A Mini-Review

“…Dong et al [ 123 ] applied Mn element implantation to the biomedical Mg surface and Mn ion and successfully modified the corrosion behavior. Jia et al [ 124 ] conducted Zr-ion implantation to control the degradation of a biomedical Mg alloy. Different from these single elements, organic matter can also be chosen as an ion source.…”

Fatigue life prediction of pre-corroded AZ31 magnesium alloy based on surface topology

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