scholarly journals Automated ex-situ detection of pitting corrosion and its effect on the mechanical integrity of rare earth magnesium alloy - WE43

2021 ◽  
Author(s):  
Kerstin van Gaalen ◽  
Felix Gremse ◽  
Felix Benn ◽  
Peter E. McHugh ◽  
Alexander Kopp ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Pitting Corrosion ◽  
Ex Situ ◽  
Mechanical Integrity ◽  
Alloy We43

Electrochemical Corrosion of Magnesium Alloy for Cardiac Implants in Artificial Plasma Solution

2016 ◽  
Vol 246 ◽  
pp. 105-108
Author(s):  
Joanna Przondziono ◽  
Piotr Zbrzeski ◽  
Eugeniusz Hadasik ◽  
Witold Walke ◽  
Janusz Szala ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Pitting Corrosion ◽  
Electrochemical Corrosion ◽  
Scanning Microscope ◽  
Corrosion Tests ◽  
Electrochemical Tests ◽  
Protective Layers ◽  
Cardiac Implants ◽  
Alloy We43 ◽  
Artificial Plasma

The study presents results of electrochemical corrosion tests of extruded magnesium alloy WE43 used for stents in cardiology. Corrosion tests were performed in artificial plasma with application of the system for electrochemical tests VoltaLab PGP201. Potentiodynamic tests enabled to register polarisation curves. Scanning microscope were used for assessment of the surface of tested alloy after corrosion tests. It was proved that the alloy is susceptible to pitting corrosion. Options of magnesium alloy WE43 application in cardiology are connected with the need for application of protective layers on implants made of the tested alloy.

ELEKTRON EQ2

Alloy Digest ◽  
2015 ◽  
Vol 64 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
High Temperature ◽  
Magnesium Alloy ◽  
North America ◽  
Earth Element ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Temperature Performance

Abstract Elektron EQ21 is a casting high strength magnesium alloy developed as a heat treatable alloy with rare earth element additions. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive, shear, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, joining, and surface treatment. Filing Code: Mg-80. Producer or source: Magnesium Elektron Wrought Products, North America.

scholarly journals Start-up Strategies for Anaerobic Ammonia Oxidation (Anammox) in In-Situ Nitrogen Removal from Polluted Groundwater in Rare Earth Mining Areas

2021 ◽  
Vol 13 (8) ◽  
pp. 4591
Author(s):  
Shuanglei Huang ◽  
Daishe Wu
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ex Situ ◽  
High Concentration ◽  
Low Concentration ◽  
Start Up ◽  
Anammox Activity

The tremendous input of ammonium and rare earth element (REE) ions released by the enormous consumption of (NH4)2SO4 in in situ leaching for ion-adsorption RE mining caused serious ground and surface water contamination. Anaerobic ammonium oxidation (anammox) was a sustainable in situ technology that can reduce this nitrogen pollution. In this research, in situ, semi in situ, and ex situ method of inoculation that included low-concentration (0.02 mg·L−1) and high-concentration (0.10 mg·L−1) lanthanum (La)(III) were adopted to explore effective start-up strategies for starting up anammox reactors seeded with activated sludge and anammox sludge. The reactors were refrigerated for 30 days at 4 °C to investigate the effects of La(III) during a period of low-temperature. The results showed that the in situ and semi in situ enrichment strategies with the addition of La(III) at a low-concentration La(III) addition (0.02 mg·L−1) reduced the length of time required to reactivate the sludge until it reached a state of stable anammox activity and high nitrogen removal efficiency by 60–71 days. The addition of La(III) promoted the formation of sludge floc with a compact structure that enabled it to resist the adverse effects of low temperature and so to maintain a high abundance of AnAOB and microbacterial community diversity of sludge during refrigeration period. The addition of La(III) at a high concentration caused the cellular percentage of AnAOB to decrease from 54.60 ± 6.19% to 17.35 ± 6.69% during the enrichment and reduced nitrogen removal efficiency to an unrecoverable level to post-refrigeration.

scholarly journals Assessment of Galvanostatic Anodic Polarization to Accelerate the Corrosion of the Bioresorbable Magnesium Alloy WE43

2021 ◽  
Vol 11 (5) ◽  
pp. 2128
Author(s):  
Nils Wegner ◽  
Frank Walther
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Dissolution Rate ◽  
Anodic Polarization ◽  
Technical Application ◽  
Efficient Manner ◽  
Corrosion Morphology ◽  
Application Range ◽  
Alloy We43

In the field of surgery, bioresorbable magnesium is considered a promising candidate. Its low corrosion resistance, which is disadvantageous for technical application, is advantageous for surgery since the implant fully degrades in the presence of the water-based body fluids, and after a defined time the regenerating bone takes over its function again. Therefore, knowledge of the corrosion behavior over several months is essential. For this reason, an in vitro short-time testing method is developed to accelerate the corrosion progress by galvanostatic anodic polarization without influencing the macroscopic corrosion morphology. The initial corrosion rate of the magnesium alloy WE43 is calculated by detection of the hydrogen volume produced in an immersion test. In a corresponding experimental setup, a galvanostatic anodic polarization is applied with a three-electrode system. The application range for the polarization is determined based on the corrosion current density from potentiodynamic polarization. To correlate the initial corrosion rate, and accelerated dissolution rate, the corrosion morphologies of both test strategies are characterized by microscopy images, as well as energy dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. The results demonstrate that the dissolution rate can be increased in the order of decades with the limitation of a changed corrosion morphology with increasing polarization. With this approach, it is possible to characterize and exclude new unsuitable magnesium alloys in a time-efficient manner before they are used in subsequent preclinical studies.

Effects of rare earth modifying inclusions on the pitting corrosion of 13Cr4Ni martensitic stainless steel

2021 ◽  
Author(s):  
Changgang Wang ◽  
Rongyao Ma ◽  
Yangtao Zhou ◽  
Yang Liu ◽  
Enobong Felix Daniel ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Rare Earth ◽  
Pitting Corrosion ◽  
Martensitic Stainless Steel

Effects of Lanthanum and Cerium Mixed Rare Earth Metal on Abrasion and Corrosion Resistance of AM60 Magnesium Alloy

2015 ◽  
Vol 44 (3) ◽  
pp. 521-526 ◽  
Author(s):  
Liang Chenghao ◽  
Wang Shusen ◽  
Huang Naibao ◽  
Zhang Zhihong ◽  
Zhang Shuchun ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Rare Earth Metal ◽  
Earth Metal

Features of in vitro and in vivo behaviour of magnesium alloy WE43

2018 ◽  
Vol 215 ◽  
pp. 308-311 ◽  
Author(s):  
Elena Lukyanova ◽  
Natalia Anisimova ◽  
Natalia Martynenko ◽  
Mikhail Kiselevsky ◽  
Sergey Dobatkin ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Alloy We43
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