scholarly journals Effect of Three Different Electrolyte Additives on Corrosion Resistance of Micro-arc Oxidation Coating of NiTi Alloy in Simulated Body Fluid

2020 ◽  
pp. 11845-11855
Author(s):  
Yao Yao ◽  
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Niti Alloy ◽  
Electrolyte Additives ◽  
Micro Arc Oxidation

Corrosion Resistance of Mg-4Zn Alloy with Amorphous Micro-Arc Oxidation Coating in Simulated Body Fluid

2016 ◽  
Vol 852 ◽  
pp. 1325-1333
Author(s):  
Li Chen Zhao ◽  
Shuang Jin Liu ◽  
Yu Min Qi ◽  
Chun Xiang Cui
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Current Density ◽  
Polarization Resistance ◽  
Body Fluid ◽  
Corrosion Current Density ◽  
Corrosion Current ◽  
Metal Substrate ◽  
Electrochemical Measurements ◽  
Micro Arc Oxidation

A binary Mg-4Zn alloy was fabricated as a potential degradable biomaterial. To improve the corrosion resistance of Mg-4Zn alloy, an amorphous micro-arc oxidation (MAO) coating was prepared on the Mg-4Zn substrate. Electrochemical measurements and immersion tests were employed to evaluate the corrosion resistance of the specimen in simulated body fluid (SBF). Electrochemical measurements show that the Mg-4Zn alloy covered with a MAO coating has a much lower corrosion current density and a much greater polarization resistance. Immersion tests suggest that the degradation of Mg-4Zn substrate is relatively serious during the initial 8 h of immersion although it has been protected by a MAO coating. When most micro-pores within the MAO coating have been filled with precipitates resulted from the corrosion of the metal substrate, the degradation of the Mg-4Zn substrate is significantly delayed.

The Effect of n-TiO2 on Corrosion and Biological Activity of Biocoatings Coated by Ultrasound Micro-Arc Oxidation on Pure Magnesium

2014 ◽  
Vol 633 ◽  
pp. 418-421 ◽  
Author(s):  
Chen Ma ◽  
Yan Gao ◽  
Li Jie Qu ◽  
Mu Qin Li ◽  
Jin Long Yue ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Biological Activity ◽  
Magnesium Alloy ◽  
Simulated Body Fluid ◽  
Surface Morphology ◽  
Body Fluid ◽  
Electrochemical Corrosion ◽  
Order Of Magnitude ◽  
Micro Arc Oxidation ◽  
Different Content

In order to improve the corrosion resistance and bioactivity of magnesium alloy coated by ultrasound micro-arc oxidation (UMAO), different content of n-TiO2 was added into silicate electrolyte. Electrochemical corrosion and simulated body fluid (SBF) soaking were conducted, and the surface morphology, phase structure and composition also were analyzed. The results indicated that Ecorr and Icorr of UMAO biocoatings with n-TiO2 increased and decreased an order of magnitude with increase of n-TiO2, respectively. The corrosion resistance of coatings with adding 4.8g/L n-TiO2 into electrolyte was the best. After soaking in SBF, the samples increased loose weight firstly and then increased weight to form Mg3Ca (CO3)4, Mg10Cl (OH)18·5H2O and Na4Mg2(PO4) ·2H2O new phases and Mg, MgO, MgSiO3 were still exit, which showed that good bioactivity of the UMAO coatings with n-TiO2.

Application of EIS to Study the Corrosion Resistance of Passivated NiTi Shape Memory Alloy in Simulated Body Fluid

2011 ◽  
Vol 183 ◽  
pp. 57-64 ◽  
Author(s):  
Marlena Freitag ◽  
B. Łosiewicz ◽  
Tomasz Goryczka ◽  
Józef Lelątko
Keyword(s):  
Corrosion Resistance ◽  
Shape Memory Alloy ◽  
Simulated Body Fluid ◽  
Shape Memory ◽  
Pitting Corrosion ◽  
Body Fluid ◽  
Niti Alloy ◽  
Amorphous State ◽  
Open Circuit ◽  
Niti Shape Memory Alloy

The NiTi shape memory alloy passivated for 90 min by autoclaving has been studied towards corrosion performance in the Tyrode’s simulated body fluid using open circuit potential and EIS measurements. The surface morphology and thickness of the oxide layer was determined by XRR. The HREM was used to observe the cross-section of the thin foil and to confirm the amorphous state of the TiO2 layer and its thickness. Electrochemical measurements revealed a good corrosion resistance at the beginning of long-term (20 days) immersion. It was found that with the increase of immersion time, the corrosion resistance of the surface deteriorated after nearly 1 day of immersion due to occurence of pitting corrosion. The EIS method was used to detailed study on the electrolyte | passive layer interfacial properties. Equivalent electrical circuit for the pitting corrosion on the passivated NiTi alloy has been applied.

Biodegradable Behaviors in Simulated Body Fluid of Mg-Gd-Y-Zr Alloy with Micro-Arc Oxide Coating

2013 ◽  
Vol 747-748 ◽  
pp. 295-300
Author(s):  
Kai Yang Yin ◽  
Tian Feng Lu ◽  
Qing Dong ◽  
Bing Yi Sun ◽  
Bin Chen
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Oxide Coating ◽  
Volume Measurement ◽  
Before And After ◽  
Micro Arc Oxidation ◽  
Weight Loss Method ◽  
Loss Method

The effects of micro-arc oxidation (MAO) on corrosion resistance of Mg-Gd-Y-Zr magnesium alloy have been studied. The Mg-Gd-Y-Zr with thicker oxide coating presented higher corrosion resistance in simulated body fluid (SBF). The corrosion rates were measured by several methods including hydrogen evolution volume measurement, weight-loss method and determination of pH as an auxiliary reference. The surfaces of specimens were observed by SEM and white light confocal microscopy before and after the corrosion. Besides the effects of MAO, the pitting resulted from breakage of oxide coating played a notable role as well. This provided a new direction towards the enhancement of corrosion resistance of magnesium alloy.

Evaluation of the Bioactivity Behavior of a 48 Wt %SiO2 Bioglass through Experiments in Simulated Body Fluid

2012 ◽  
Vol 727-728 ◽  
pp. 1238-1242 ◽  
Author(s):  
Roger Borges ◽  
Antônio Carlos da Silva ◽  
Juliana Marchi
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Glass Network ◽  
In Vitro Experiments ◽  
High Corrosion Resistance ◽  
Before And After ◽  
O 19

Among bioceramics materials, bioglasses which exhibits either a bioactive or resorbable behavior has been studied for many applications, such as bone substitutive and regeneration. When in contact with body fluid, the bioglasses can induce the formation of a hydroxyapatite surface layer. In this paper, we studied the bioactivity of a bioglass containing 48 wt %SiO2, 27 wt% Na2O, 19 wt % CaO and 6 wt %P2O5. After fusion and annealing, the samples were immersed in SBF for different periods, up to 14 days. The samples were characterized through XRD, DRIFT and SEM before and after bioactivity experiments. The overall results suggest the formation of a surface layer of consisting of hydroxyapatite, which was crystallized within seven days after in vitro experiments, leading to a suitable bioactivity. Moreover, the samples showed a glass network with high cohesion due to calcium addition, leading to materials with high corrosion resistance.

STUDY OF NICKEL ION RELEASE IN SIMULATED BODY FLUID FROM C+-IMPLANTED NICKEL TITANIUM ALLOY

2016 ◽  
Vol 23 (05) ◽  
pp. 1650045 ◽  
Author(s):  
MUHAMMAD AHSAN SHAFIQUE ◽  
G. MURTAZA ◽  
SHAHZAD SAADAT ◽  
ZEESHAN ZAHEER ◽  
MUHAMMAD SHAHNAWAZ ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Niti Alloy ◽  
Niti Shape Memory Alloy ◽  
Ion Release ◽  
Nickel Ion ◽  
Oxidation Layer ◽  
X Ray ◽  
Calcium Phosphate Precipitation

Nickel ion release from NiTi shape memory alloy is an issue for biomedical applications. This study was planned to study the effect of C[Formula: see text] implantation on nickel ion release and affinity of calcium phosphate precipitation on NiTi alloy. Four annealed samples are chosen for the present study; three samples with oxidation layer and the fourth without oxidation layer. X-ray diffraction (XRD) spectra reveal amorphization with ion implantation. Proton-induced X-ray emission (PIXE) result shows insignificant increase in Ni release in simulated body fluid (SBF) and calcium phosphate precipitation up to [Formula: see text][Formula: see text]ions/cm2. Then Nickel contents show a sharp increase for greater ion doses. Corrosion potential decreases by increasing the dose but all the samples passivate after the same interval of time and at the same level of [Formula: see text] in ringer lactate solution. Hardness of samples initially increases at greater rate (up to [Formula: see text][Formula: see text]ions/cm[Formula: see text] and then increases with lesser rate. It is found that [Formula: see text][Formula: see text]ions/cm2 ([Formula: see text] is a safer limit of implantation on NiTi alloy, this limit gives us lesser ion release, better hardness and reasonable hydroxyapatite incubation affinity.

The influence of porosity on corrosion characteristics of porous NiTi alloy in simulated body fluid

2002 ◽  
Vol 57 (2) ◽  
pp. 448-451 ◽  
Author(s):  
Yong-Hua Li ◽  
Guang-Bin Rao ◽  
Li-Jian Rong ◽  
Yi-Yi Li
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Niti Alloy ◽  
Porous Niti
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