Corrosion Resistance Of Metallic Glasses Research Articles

Effect of cryogenic cycling and above-Tg annealing on the corrosion behavior of Zr-Cu-Ti-Be metallic glass

This work investigates the electrochemical properties of Zr-based Zr35Ti30Cu8.25Be26.75 metallic glass after cryogenic treatment and isothermal annealing above glass transition temperature. Potentiodynamic polarization and electrochemical impedance spectroscopy experiments are used to understand the effect of structural state on the corrosion behavior of Zr-based metallic glass. The metallic glass samples are cycled between liquid nitrogen to room temperature and isothermally held at liquid nitrogen to unravel the effect of cryogenic treatments on the electrochemical properties. The corrosion of cryogenically treated and high temperature annealed samples is compared with the as-cast samples. The results show that holding at liquid nitrogen temperature improves the corrosion resistance of metallic glass compared to cryogenic cycling and the high temperature annealing. These findings are explained based on the changes in structural state of metallic glass.

Ion Irradiation Effect on Mechanical Properties and Corrosion Resistance of a Cu50Zr50 Metallic Glass

The effect of H+‐ion irradiation on the structure and properties of a Cu50Zr50 metallic glass (MG) is investigated. High‐energy synchrotron X‐Ray diffraction results indicate that the glass maintains its amorphous nature after ion irradiation. As the ion fluence increases, the atomic bond length of MGs becomes shorter, whereas the nanohardness and Young's modulus increase from 7.08 ± 0.01 and 111.3 ± 1.1 GPa for the as‐spun sample to 8.59 ± 0.06 and 123.1 ± 1.3 GPa for the sample irradiated with 2 × 1016 cm−2 fluence. The corrosion potential of the studied MG in 1 mol L−1 HCl increases from −0.5953 to −0.4519 V, suggesting an enhanced corrosion resistance of MGs after ion irradiation. The modification of mechanical properties and corrosion resistance can be interpreted from the ion irradiation‐induced structural evolution. The results obtained herein can be beneficial for better understanding the mechanical properties and corrosive behaviors of MGs under extreme conditions like ion irradiation, thus promoting their industrial applications.

Research Progress on Corrosion Resistance of Metallic Glasses

Research Progress on Corrosion Resistance of Metallic Glasses

Bio-corrosion studies of Fe-based metallic glasses

Abstract Fe-based metallic glasses are known for their high corrosion resistance. Also, the corrosion resistance of metallic glasses are greatly influenced by the alloying elements. In the present study, the bio-corrosion resistance of two Fe-based metallic glasses (Fe32Ni36Cr14P12B6 and Fe67Co18B14Si1) has been studied. The bio-compatibility of these metallic glasses are studied in four simulated body fluids (SBFs), namely artificial saliva solution (ASS), phosphate-buffered saline solution (PBS), artificial blood plasma solution (ABP), and Hank’s balanced saline solution (HBSS). Potentiodynamic polarization studies are performed on both the metallic glasses, for understanding their bio-compatibility.

Effects of Ti addition on corrosion behavior of Zr-based metallic glass in chloride medium

The effects of Ti element on the corrosion resistance of the metallic glass Zr51.3Al10Ni6Cu31.8Ag0.1Y0.8 in aqueous solution with various chloride concentrations were investigated, and the effect mechanism was discussed. X-ray diffraction confirmed that Ti-added Zr51.3Al10Ni6Cu31.8Ag0.1Y0.8 metallic glasses with diameter of 3 mm were all metallic glasses. Weight loss and electrochemical method were introduced to characterize their corrosion resistance, and X-ray photoelectron spectroscopy study was used to characterize the passive film composition. The results show that the corrosion resistance of metallic glass is significantly improved with Ti addition, and Zr dioxides dominate in passive film during corrosion when Ti content is low. High Ti addition can lead to an obvious accumulation of Ti dioxides, which results in a thicker, Ti-enriched protective passive film.

Effects of Li addition on the corrosion behaviour and biocompatibility of Mg(Li)–Zn–Ca metallic glasses

Magnesium alloys with suitable corrosion behaviour and good mechanical properties are desired for biodegradable materials. In the current study, novel Mg–Li-based metallic glasses (MGs) demonstrate potential clinical applications as implantable biodegradable materials. The amorphous structure of MGs provides suitable elastic modulus with human bone. The enhanced corrosion resistance of MGs realises a uniform corrosion process, as well as maintains a stable acid-based environment, and increases cell proliferation. A schematic model is proposed to illustrate the corrosion mechanisms of MGs. Adding Li significantly improves the corrosion resistance of MGs. Both the indirect cytotoxicity and direct cell culture assays are conducted using transfected osteoblasts (hFOB) cells. Results show that the novel Mg–Li–Zn–Ca MGs have good biocompatibility.

Fabrication of metallic glass micro grooves by thermoplastic forming

Metallic glasses (MGs) are considered as ideal materials for miniature fabrication because of their excellent thermoplastic forming ability in the supercooled liquid region. We show that Pd-based MG micro grooves, which are essential for microdluidic devices, can be prepared by a highly efficient and precise fabrication method. The scanning electron microscope observation and surface profiler measurement show that the MG micro grooves have superior dimensional accuracy. The excellent corrosion resistance of MGs compared with silicon, which is the conventional microfluidic device material, is also proved by the weight-loss corrosion method. Our results indicate that MG can be a promising candidate material for the fabrication of microfluidic devices and may have broad applications in the biomedical areas.

Simulated body-fluid tests and electrochemical investigations on biocompatibility of metallic glasses

This paper presents the in-vitro and electrochemical investigations of four metallic glasses (MGs) for finding potential MG-based bio-materials. The simulation body-fluid Hanks solution is utilized for testing the corrosion resistance of MGs, and microorganisms of Escherichia coli are used in testing the bio-toxicity. In addition, a simple cyclic voltammetry method is used for rapid verification of the potential electrochemical responses. It is found that the Zr-based MG can sustain in the body-fluid, exhibiting the best corrosion resistance and electrochemical stability. The microbiologic test shows that E. coli can grow on the surface of the Zr-based metallic glass, confirming the low cell toxicity of this Zr-based MG.

The influence of spark plasma sintering temperature on the mechanical properties and corrosion resistance of Zr 65Al 10Ni 10Cu 15 metallic glass powder

Spherical Zr 65Al 10Ni 10Cu 15 metallic glass (MG) powders were prepared using a high-pressure gas atomizer, followed by consolidation using spark plasma sintering (SPS) process. This investigation is to discuss the thermal properties, mechanical properties and corrosion resistance of MGs with the SPS temperature. The SPS bulk showed that both the mechanical properties and corrosion resistance improved with increasing the temperature. As the temperature became over the glass transition temperature ( T g ), however, these properties dramatically lowered, corresponding to formation of crystalline phases.

Influence of yttrium as a minority alloying element on the corrosion behavior in Fe-based bulk metallic glasses

The role of yttrium in corrosion behavior in an HCl solution was studied systematically by comparing bulk FeCrMoCB metallic glasses with and without yttrium. The corrosion resistance was very sensitive to minor yttrium addition. The material exhibits a detrimental effect on corrosion resistance at 0.5 at.% yttrium addition while a beneficial effect at more yttrium additions. Such effects are argued to be associated with variations of the semiconductor properties of passive film ( i.e. defects concentration and band structure of passive film), induced by minority yttrium alloying element doping. It was shown that there exhibits a bi-layer structure of passive film on Fe-based metallic glasses. The outer layer with high valence cations is responsible for the dissolution behavior of the passive film, whereas the inner layer with doped oxides connects with the semiconductor properties. This result presents us an important hint that the corrosion resistance of metallic glasses can be improved by elaborately tailoring the defect structure of passive film via proper additions of minor alloying elements.