Surface modification and corrosion resistance of Ni-Ti alloy used for urological stents

Abstract

Purpose: The work presents the influence of the surface treatment of Ni-Ti alloy, intended for implants applied in urogenital surgery, on their corrosion resistance. The tests were carried out in the simulated urine at the temperature 37±1oC and pH = 5.6÷6.4. In particular, the pitting and crevice corrosion resistance tests were carried out. Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curves with the use of the potentiodynamic method. The VoltaLab® PGP 201 system for electrochemical tests was applied. The tests were carried out in electrolyte simulating urine (pH = 5.6 ÷ 6.4) at the temperature of 37±1oC. Findings: Surface condition of metallic biomaterial determines its corrosion resistance. Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the Ni-Ti alloy. Practical implications: On the basis of the obtained results it can be stated that Ni-Ti alloy can be applied in urology. Originality/value: The paper presents the influence of the surface treatment on corrosion resistance of Ni-Ti alloy.