Localized corrosion of magnesium alloys potentially applicable for medical implants: fundamental aspects

2021 ◽  
pp. 47-52
Author(s):  
A. S. Gnedenkov ◽  
S. V. Lamaka ◽  
S. L. Sinebryukhov ◽  
V. S. Filonina ◽  
M. L. Zheludkevich ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Localized Corrosion ◽  
Medical Implants

Testing of General and Localized Corrosion of Magnesium Alloys: A Critical Review

2004 ◽  
Vol 13 (5) ◽  
pp. 517-529 ◽  
Author(s):  
Edward Ghali ◽  
Wolfgang Dietzel ◽  
Karl-Ulrich Kainer
Keyword(s):  
Magnesium Alloys ◽  
Critical Review ◽  
Localized Corrosion

General and Localized Corrosion of Magnesium Alloys: A Critical Review

2004 ◽  
Vol 13 (1) ◽  
pp. 7-23 ◽  
Author(s):  
Edward Ghali ◽  
Wolfgang Dietzel ◽  
Karl-Ulrich Kainer
Keyword(s):  
Magnesium Alloys ◽  
Critical Review ◽  
Localized Corrosion

scholarly journals The Influence of Zr on Microstructure, Mechanical Properties and Corrosion Resistance in Mg-Y-Zr Biodegradable Alloys

2019 ◽  
Vol 69 (12) ◽  
pp. 3382-3385
Author(s):  
Stefan Lupescu ◽  
Corneliu Munteanu ◽  
Bogdan Istrate ◽  
Kamel Earar
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Xrd Analysis ◽  
Hexagonal Structure ◽  
Final Conclusion ◽  
Medical Implants ◽  
X Ray Diffraction ◽  
Linear Voltammetry ◽  
Mechanical Properties And Corrosion

The latest magnesium alloys are widely used in the medical field, especially for biodegradable implants. Magnesium alloys are very attractive for applications in different structures in the automotive, aerospace, printing and even medical fields [1]. It should be noted that some magnesium alloys have excellent damping properties as well as good mechanical properties, making them promising to respond to high damping needs for vibration control [1,2]. Although widely used, magnesium has a low corrosion resistance. To improve this resistance, different types of magnesium based on aluminum, such as Ca, Mn, Zn, Zr, Si and rare rare (Y, Gd ..), can be developed. The main purpose of this paper is to investigate the properties of a primary alloy based on the Mg-1Y-0,5Zr system with different concentrations of Zr (0.5,1,2) used in the development of alloys based on the biodegradability of Mg. Surface morphology was characterized by electronic scanning microscopy (SEM), X-ray diffraction (XRD) and optical microscopy. After XRD analysis, it was observed that certain specific compounds were made up of Mg2Ca, MgZr, Mg2Y, Mg24Y5 having the main Mg formed in the hexagonal structure, but Mg24Y5 are the cubic crystalline structure. Also, the microhardness of the alloy is higher than pure Mg and the scratch mark is smaller than that of pure Mg. The corrosion resistance was developed using linear voltammetry in specific medium and corrosion showed that it had significantly decreased for masteralloy. As a final conclusion, the structural properties of this model are recommended for use as medical implants.

scholarly journals Electrochemical Corrosion Behaviour of ZE41 and QE22 Magnesium Alloys

2011 ◽  
Vol 690 ◽  
pp. 385-388 ◽  
Author(s):  
M. Bobby Kannan ◽  
Carsten Blawert ◽  
Wolfgang Dietzel
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Rare Earths ◽  
Pitting Corrosion ◽  
Corrosion Behaviour ◽  
Electrochemical Corrosion ◽  
Localized Corrosion ◽  
Az80 Magnesium Alloy ◽  
Electrochemical Corrosion Behaviour

The study suggests that the rare-earths containing magnesium alloys ZE41 and QE22 exhibit a poorer corrosion resistance than the AZ80 magnesium alloy. Electrochemical experiments showed that the two rare-earths containing alloys are highly susceptible to localized corrosion. Post corrosion analysis revealed intergranular and pitting corrosion in ZE41, whereas QE22 alloy underwent only pitting corrosion.

TEM study of a biofilm on copper corrosion

1996 ◽  
Vol 54 ◽  
pp. 220-221
Author(s):  
W. A. Chiou ◽  
N. Kohyama ◽  
B. Little ◽  
P. Wagner ◽  
M. Meshii
Keyword(s):  
Marine Bacterium ◽  
Culture Medium ◽  
Copper Alloys ◽  
Pure Copper ◽  
Localized Corrosion ◽  
Natural Seawater ◽  
Copper Corrosion ◽  
New Approach ◽  
The Past ◽  
Copper Tolerant

The corrosion of copper and copper alloys in a marine environment is of great concern because of their widespread use in heat exchangers and steam condensers in which natural seawater is the coolant. It has become increasingly evident that microorganisms play an important role in the corrosion of a number of metals and alloys under a variety of environments. For the past 15 years the use of SEM has proven to be useful in studying biofilms and spatial relationships between bacteria and localized corrosion of metals. Little information, however, has been obtained using TEM capitalizing on its higher spacial resolution and the transmission observation of interfaces. The research presented herein is the first step of this new approach in studying the corrosion with biological influence in pure copper.Commercially produced copper (Cu, 99%) foils of approximately 120 μm thick exposed to a copper-tolerant marine bacterium, Oceanospirillum, and an abiotic culture medium were subsampled (1 cm × 1 cm) for this study along with unexposed control samples.

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