Study on Corrosion Properties of Medical Mg-Zn Alloy

2018 ◽  
Vol 777 ◽  
pp. 607-611
Author(s):  
Zhi Ling Wang
Keyword(s):  
Simulated Body Fluid ◽  
Corrosion Rate ◽  
Body Fluid ◽  
Body Fluids ◽  
Corrosion Products ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Zn Content ◽  
Simulated Body Fluids ◽  
Zn Alloy

Casting Mg-Zn alloy was corroded on the surface and analyzed the corrosion morphology and corrosion properties under different corrosion conditions. The results show that Mg-Zn alloy is unevenly by corrosion in simulated body fluids and the corrosion products are brittle and easy to break. With the increase of Zn content in Mg-Zn alloy, the corrosion rate of casting Mg-Zn alloy in simulated body fluid is improved obviously.

Bioactivity of Silver Doped Hydroxyapatite Scaffolds in Simulated Body Fluids

2014 ◽  
Vol 604 ◽  
pp. 175-179 ◽  
Author(s):  
Lasma Poca ◽  
Arita Dubnika ◽  
Dagnija Loca ◽  
Liga Berzina-Cimdina
Keyword(s):  
Simulated Body Fluid ◽  
Incubation Period ◽  
Powder Diffraction ◽  
Body Fluid ◽  
Body Fluids ◽  
Apatite Layer ◽  
X Ray ◽  
Simulated Body Fluids ◽  
Two Phases

In the present study, thein vitrobioactivity of silver-doped hydroxyapatite (HAp/Ag) scaffolds was investigated. HAp/Ag was prepared using two different modified wet precipitation methods. The X-ray powder diffraction (XRD) results showed, that sintered HAp/Ag samples prepared using method (I) contain two phases HAp and Ag, but samples prepared by method (II) contain three different phases - HAp, Ag and AgO. After 2 month incubation period in simulated body fluid (SBF), surface of HAp/Ag scaffolds was coated with bone-like apatite. Thickness of bone-like apatite layer increased from 2 μm up to 32 μm, increasing the incubation period.

Biodegradable Behaviors of Mg-6%Zn-5%Hydroxyapatite Biomaterial

2011 ◽  
Vol 239-242 ◽  
pp. 1287-1291 ◽  
Author(s):  
Jun Zhao ◽  
Zhi Ming Yu ◽  
Kun Yu ◽  
Liang Jian Chen
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Corrosion Products ◽  
Powder Metallurgy Method ◽  
Corrosion Rates ◽  
Immersion Corrosion ◽  
Zn Alloy

The Mg-6%Zn-5%Hydroxyapatite (HA) biomaterial had been prepared through powder metallurgy method in this investigation. The mechanical properties and biodegradable behaviors of the Mg-Zn-HAcomposite in simulated body fluid were studied. The Mg-Zn-HA specimens obtained appropriate density, adjustable elastic modulus and compatible strength to natural bones. Immersion corrosion experiments revealed that 5wt% addition of HA in Mg-6%Zn alloy exhibited acceptable corrosion rates in simulated body fluid. The Mg matrix, Mg7Zn3phase and HA are identified in the experimental composite. The Mg(OH)2and Hydroxyapatite were found on the corrosion products in the simulated body fluid.

scholarly journals Laser irradiation of Mg-Al-Zn alloy: Reduced electrochemical kinetics and enhanced performance in simulated body fluid

2017 ◽  
Vol 12 (2) ◽  
pp. 021003 ◽  
Author(s):  
David C. Florian ◽  
Michael A. Melia ◽  
Fritz W. Steuer ◽  
Bruce F. Briglia ◽  
Michael K. Purzycki ◽  
...  
Keyword(s):  
Simulated Body Fluid ◽  
Laser Irradiation ◽  
Body Fluid ◽  
Electrochemical Kinetics ◽  
Zn Alloy

scholarly journals Corrosion study of metallic biomaterials in simulated body fluid

10.30544/384 ◽  
2011 ◽  
Vol 17 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Hamid Reza Asgari Bidhendi ◽  
Majid Pouranvari
Keyword(s):  
Stainless Steel ◽  
Simulated Body Fluid ◽  
Corrosion Behavior ◽  
Body Fluid ◽  
Pure Titanium ◽  
Localized Corrosion ◽  
Commercially Pure Titanium ◽  
Corrosion Properties ◽  
Cyclic Polarization ◽  
Cp Ti

Titanium alloys and stainless steel 316L are still the most widely used biomaterials for implants despite emerging new materials for this application. There is still someambiguity in corrosion behavior of metals in simulated body fluid (SBF). This paper aims at investigating the corrosion behavior of commercially pure titanium (CP-Ti), Ti–6Al–4V and 316LVM stainless steel (316LVM) in SBF (Hank’s solution) at37 ºC using the cyclic polarization test. Corrosion behavior was described in terms of breakdown potential, the potential and rate ofcorrosion, localized corrosion resistance, andbreakdown repassivation. The effects of anodizing on CP-Ti samples and the passivation on the 316LVM were studied in detail. It was shown that CP-Ti exhibited superior corrosion properties compared to Ti–6Al–4V and 316LVM.

Influence of various sterilization methods on hardness, grain size and corrosion rate of a Mg6Ag-alloy

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Frank Feyerabend ◽  
Martin Johannisson ◽  
Zhidan Liu ◽  
Regine Willumeit-Römer
Keyword(s):  
Grain Size ◽  
Corrosion Rate ◽  
Optimum Ratio ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Materials Properties ◽  
Physiological Conditions ◽  
Alloying System ◽  
Dry Heat

AbstractSterilization is a necessary step for all implant materials. Different methods can influence the materials properties. Especially important for magnesium as degradable materials is the determination of the corrosion properties. In this study the influence of 70% ethanol, glutaraldehyde, autoclaving, dry heat, UV-, gamma- and electron beam-irradiation on mechanical and corrosion parameters were analyzed. As mechanical parameters hardness and grain size were determined. The corrosion rate under physiological conditions, weight of the corrosion layer and corrosion morphology was determined. It could be demonstrated that irradiation treatments and 70% ethanol are suitable methods, as they decrease the corrosion rate. Heat-introducing methods (autoclaving and dry heat) acted as incomplete ageing treatments on this alloy and therefore increased the corrosion rate. Furthermore, osmolality showed a better correlation to the actual corrosion rate than the pH. Therefore an optimum ratio between alloying system, implant and sterilization method has to be established, depending on the intended application.

Effect of Polarization Scan Rate on the Pitting Potential of the Self-Passivated NiTi Shape Memory Alloy in a Simulated Body Fluid

2015 ◽  
Vol 227 ◽  
pp. 443-446 ◽  
Author(s):  
Patrycja Osak ◽  
Tomasz Goryczka ◽  
Bożena Łosiewicz
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Passive Layer ◽  
The Self ◽  
Niti Shape Memory Alloy ◽  
Pitting Potential ◽  
Ringer’S Solution ◽  
Metallic Biomaterials ◽  
Scan Rate ◽  
Simulated Body Fluids

The pitting potential,Epit, of the passive layer on the implant alloy can be treated as an accelerated laboratory test to assessment a susceptibility to pitting corrosion of metallic biomaterials in simulated body fluids. This study deals with an evaluation ofEpitof the self-passivated TiO2layer formed on the surface of the NiTi implant alloy as a function of the scan rate of polarization. Cyclic potentiodynamic studies were performed in Ringer’s solution at 37°C. It was found out that the more noble value ofEpitin the range of 0.99-2 V was registered at a given polarization scan rate that ranged from 0.16 to 2 mV s-1, the lower susceptibility of the self-passivated NiTi implant alloy to the initiation of pits was detected.

scholarly journals Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 231
Author(s):  
Farzad Soleymani ◽  
Rahmatollah Emadi ◽  
Sorour Sadeghzade ◽  
Fariborz Tavangarian
Keyword(s):  
Simulated Body Fluid ◽  
Corrosion Rate ◽  
Composite Coating ◽  
Body Fluid ◽  
Composite Coatings ◽  
Phosphate Buffer Solution ◽  
Az91 Alloy ◽  
Apatite Formation ◽  
Az91 Magnesium Alloy ◽  
Sbf Solution

Polymer–ceramic composite coatings on magnesium-based alloys have attracted lots of attention in recent years, to control the speed of degradability and to enhance bioactivity and biocompatibility. In this study, to decrease the corrosion rate in a simulated body fluid (SBF) solution for long periods, to control degradability, and to enhance bioactivity, polycaprolactone–chitosan composite coatings with different percentages of baghdadite (0 wt.%, 3 wt.%, and 5 wt.%) were applied to an anodized AZ91 alloy. According to the results of the immersion test of the composite coating containing 3 wt.% baghdadite in a phosphate buffer solution (PBS), the corrosion rate decreased from 0.45 (for the AZ91 sample) to 0.11 mg/cm2·h after seven days of immersion. To evaluate the apatite formation capability of specimens, samples were immersed in an SBF solution. The results showed that the samples were bioactive as apatite layers formed on the surface of specimens. The composite coating containing 3 wt.% baghdadite showed the highest apatite-formation capability, with a controlled release of ions, and the lowest corrosion rate in the SBF.

scholarly journals Corrosion Behavior of As-Cast Binary Mg-Dy Alloys

2011 ◽  
Vol 690 ◽  
pp. 417-421 ◽  
Author(s):  
Lei Yang ◽  
Frank Feyerabend ◽  
Karl Ulrich Kainer ◽  
Regine Willumeit ◽  
Norbert Hort
Keyword(s):  
Corrosion Rate ◽  
Optical Microscope ◽  
Direct Chill ◽  
Second Phase ◽  
Alloying Element ◽  
High Solubility ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Filiform Corrosion ◽  
Very High

The addition of rare earth elements (REE) is an effective way to improve the corrosion properties of magnesium alloys. Dysprosium has a very high solubility in Mg (25.3 wt.% at 561 °C) and could therefore be a promising alloying element for Mg based implants. In this study, four binary Mg-xDy (x=5, 10, 15 and 20 in wt.%) alloys were prepared by permanent mould direct chill casting. Microstructure and Dy distribution were investigated using optical microscope and EDX analysis. Corrosion rate was measured with hydrogen evolution method and corrosion morphology was observed after immersion for different time in 0.9 wt% NaCl solution with optical and SEM. The results show that with the increase of Dy, the amount of Dy in Mg matrix and area of Dy segregation are both increased. At the same time, the amount of second phase is also increased. Filiform corrosion is reduced while pitting corrosion is increased with the increment of Dy. As a result, lowest corrosion rate is obtained at Mg-10Dy alloy.

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