Polarization Behavior of Bulk Zr-Base Amorphous Alloy Immersed in Cell Culture Medium

Abstract

Effects of amino acids and proteins on polarization behavior of Zr-base amorphous alloy were examined using Hanks' solution, minimum essential medium (MEM), and cell culture medium (MEM+FBS) consisting with MEM and fetal bovine serum (FBS), respectively. Amorphous powder consolidated Zr 55 Al 10 Ni 10 Cu 15 alloy was cathodically and anodically polarized at the beginning of (after 1.8 ks) immersion and after a long-term (605 ks) immersion in each solution. Parameters on the anodic polarization curve; open-circuit potential (E open ), polarization resistance (R p ), and pitting potential (E pit ), were obtained for the examination of corrosion resistance. In the presence of amino acids and proteins, R p and E pit increased, indicating that resistance to both general and pitting corrosion was raised with those biomolecules. Thus, the adsorbed biomolecules probably work as a diffusion barrier to molecules and ions such as dissolved oxygen and phosphate and chloride ions. During immersion, the surface oxide film grew, leading to the increase in E open , average E pit , and R p although the parameters showed wide variance of deviation probably caused by the defects in alloy structure. The lowest values of E pit after the long-term immersion were not lower than those at the beginning of immersion, indicating that the sensitivity of defects to chloride ion was not enhanced during immersion. However, the pitting corrosion resistance decreased during immersion because the potential difference between E open and E pit decreased.

Electrochemical and antimicrobial properties of diamondlike carbon-metal composite films

“…The mean pH (± 95% confidence intervals) of the PBS electrolyte for all tests was 7.41 ± 0.01, which is near that found in the human body (7.0 -7.4) [50]. The dissolved oxygen content of this electrolyte was reduced to a physiologically-relevant value of 3.3 x 10 -2 mol/m 3 by aerating the electrolyte with a 4% O 2 /N 2 gas mixture at a flow rate of 50 mL/min for one hour prior to testing [51].…”

Preparation of Open-Cell Porous Zr-Based Bulk Glassy Alloy

“…Moreover, the complicated open-cell structure promotes the trapping of corrosives and thereby prevents the oxygen supply to sustain a stable oxide passive film. It should, however, be noted that the porous alloy still has a passivation ability and almost same corrosion resistance level to that of solid Zr-based bulk glassy alloy 27) which has been reported to be an applicable biomaterials. 23,24) Based on these experimental results we discuss the potential ability for biomaterial use of this Zr-based porous bulk glassy alloy.…”

“…19) Zr-based alloys, on the other hand, are known to have very high bulk glass-forming ability, 20,21) good mechanical and chemical properties 22) and have been reported to be a promising material for biomedical application. 23,24) Developing Zrbased bulk glassy alloy foams is therefore important for the future application such as biomedical implants. This paper reports processing method, porous structure, mechanical properties and corrosion resistant properties of an open-cell porous Zr-based bulk glassy alloy.…”

Fabrication and Mechanical Properties of Composite Structure by Warm Spraying of Zr-Base Metallic Glass

“…So far, aiming at use as the implant material of zirconium (Zr)-base and Pd-base glass alloy, several studies have been conducted to evaluate their mechanical properties 4,5) and corrosion resistance. [6][7][8] In order to use glass alloy as a structural material in bone fixation device and artificial joint, where the material will experience both impact stress and the repeated stress, however, there might be some risks in reliability because of its insufficient toughness. This leads a concept of using the glass alloys in combination with conventional metallic biomaterials as one of the effective solutions to take advantages of both materials, i.e.…”