Corrosion behavior of biomedical AZ91 magnesium alloy in simulated body fluids

2007 ◽  
Vol 22 (7) ◽  
pp. 2004-2011 ◽  
Author(s):  
Yunchang Xin ◽  
Chenglong Liu ◽  
Xinmeng Zhang ◽  
Guoyi Tang ◽  
Xiubo Tian ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Visual Observation ◽  
Body Fluids ◽  
Open Circuit ◽  
Az91 Magnesium Alloy ◽  
Degradation Rates ◽  
Az91 Magnesium ◽  
Simulated Body Fluids

Fast degradation rates in the physiological environment constitute the main limitation for magnesium alloys used in biodegradable hard tissue implants. In this work, the corrosion behavior of AZ91 magnesium alloy in simulated body fluids (SBF) was systematically investigated to determine its performance in a physiological environment. The influence of the main constituent phases on the corrosion behavior was studied by in situ visual observation and scanning electron microscopy. Energy dispersive x-ray spectrometry and Fourier transfer infrared spectroscopy revealed that both calcium and magnesium phosphates are present in the corroded products besides magnesium oxide. Electrochemical methods including open circuit potential evolution and electrochemical impedance spectroscopy were used to investigate the mechanism. The corresponding electrode controlled processes and evolution of the corrosion products layer were discussed. The degradation rate after immersion in SBF for seven days was calculated from both the weight loss and hydrogen evolution methods.

scholarly journals Improvement of AZ91 Alloy Corrosion Properties by Duplex NI-P Coating Deposition

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1357 ◽  
Author(s):  
Jaromír Wasserbauer ◽  
Martin Buchtík ◽  
Jakub Tkacz ◽  
Stanislava Fintová ◽  
Jozef Minda ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Az91 Alloy ◽  
Neutral Salt ◽  
Az91 Magnesium Alloy ◽  
Corrosion Properties ◽  
Az91 Magnesium

The corrosion behavior of duplex Ni-P coatings deposited on AZ91 magnesium alloy was studied. The electroless deposition process of duplex Ni-P coating consisted in the preparation of low-phosphorus Ni-P coating (5.7 wt.% of P), which served as a bond coating and high-phosphorus Ni-P coating (11.5 wt.% of P) deposited on it. The duplex Ni-P coatings with the thickness of 25, 50, 75 and 100 µm were deposited on AZ91 magnesium alloy. The electrochemical corrosion behavior of coated AZ91 magnesium alloy was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization method in 0.1 M NaCl. Obtained results showed a significant improvement in the corrosion resistance of coated specimens when compared to uncoated AZ91 magnesium alloy. From the results of the immersion tests in 3.5 wt.% NaCl, 10% solution of HCl and NaOH and 5% neutral salt spray, a noticeable increase in the corrosion resistance with the increasing thickness of the Ni-P coating was observed.

Electrochemical Behavior Al[sub 2]O[sub 3]∕Al Coated Surgical AZ91 Magnesium Alloy in Simulated Body Fluids

2008 ◽  
Vol 155 (5) ◽  
pp. C178 ◽  
Author(s):  
Yunchang Xin ◽  
Chenglong Liu ◽  
Wenjun Zhang ◽  
Jiang Jiang ◽  
Guoyi Tang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Electrochemical Behavior ◽  
Body Fluids ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Simulated Body Fluids

Corrosion of hot extrusion AZ91 magnesium alloy: I-relation between the microstructure and corrosion behavior

2011 ◽  
Vol 53 (5) ◽  
pp. 1960-1968 ◽  
Author(s):  
Tao Zhang ◽  
Yawei Shao ◽  
Guozhe Meng ◽  
Zhongyu Cui ◽  
Fuhui Wang
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Hot Extrusion ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

Magnesium Alloys as Biodegradable Implants

2009 ◽  
Vol 618-619 ◽  
pp. 83-86
Author(s):  
M. Bobby Kannan ◽  
R.K. Singh Raman
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Electrochemical Impedance ◽  
Alkali Treatment ◽  
Test Sample ◽  
Az91 Magnesium Alloy ◽  
Biodegradable Implant ◽  
Degradation Behaviour ◽  
Az91 Magnesium

In this study, an attempt was made to enhance the degradation resistance of magnesium alloys for potential biodegradable implant applications through surface treatment. AZ91 magnesium alloy was taken as the test sample and was alkali-treated for two different periods of time and then the in vitro degradation behaviour of the alloy was studied using electrochemical impedance spectroscopy and polarization techniques in simulated body fluid. The study suggests that alkali-treatment reduces the degradation rate in AZ91 magnesium alloy.

Corrosion behavior of AZ91 magnesium alloy in dilute NaCl solutions

2010 ◽  
Vol 31 (2) ◽  
pp. 857-863 ◽  
Author(s):  
Lei Wang ◽  
Bo-Ping Zhang ◽  
Tadashi Shinohara
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium
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