scholarly journals Preparation and Corrosion Performance of PPy/Silane Film on AZ31 Magnesium Alloy via One-Step Cyclic Voltammetry

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3148
Author(s):  
Chuang Peng ◽  
Nana Cao ◽  
Ziheng Qi ◽  
Yongde Yan ◽  
Ruizhi Wu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Magnesium Alloy ◽  
Coupling Agent ◽  
Volume Fraction ◽  
Corrosion Current ◽  
Mg Alloy ◽  
Mixed Solution ◽  
Step Cycle ◽  
Az31 Mg Alloy ◽  
One Step

PPy/silane composite film on a magnesium alloy surface was prepared by one-step cycle voltammetry. The mixed solution of methanol and water was used as the hydrolysis solvent of a γ-(2,3-glycidoxypropyl) trimethoxysilane coupling agent (KH-560). The surface morphology of the PPy/silane film, the electro-polymerization progress of KH-560 and PPy, the influence of the silane coupling agent and the corrosion behavior of the coated AZ31 Mg alloy were all investigated. The results indicated that the PPy/silane film on AZ31 Mg alloy via one-step cyclic voltammetry could provide better corrosion protection for an Mg alloy when the volume fraction of KH-560 in the hydrolysis solution was 15% and the time span of hydrolysis was 24 h with the 5.935 × 10−10 A cm−2 corrosion current density.

Improving the Mechanical Properties of AZ31 Mg Alloy by High Ratio Extrusion

2006 ◽  
Vol 503-504 ◽  
pp. 865-870 ◽  
Author(s):  
Yongjun Chen ◽  
Qu Dong Wang ◽  
Jianguo Peng ◽  
Chun Quan Zhai
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
High Ratio ◽  
Extrusion Ratio ◽  
Mg Alloy ◽  
Fine Grained ◽  
Az31 Mg Alloy ◽  
Industry Applications ◽  
One Step ◽  
The One

Experiments were conducted both to evaluate the potential for grain refinement, the subsequent mechanical properties at room temperature in samples of AZ31 Mg alloy and also to investigate the relationship between one-step and two-step high ratio extrusion (HRE). The one-step HRE was undertaken using a high extrusion ratio of 70:1 at 250, 300 and 350°C. And the two-step HRE was conducted with an extrusion ratio of 7 for the first step at 250, 300 and 350°C, followed by a second-step extrusion with an extrusion ratio of 10 at 250, 300 and 350°C. The initial grain size in the AZ31 ingot was 100μm and that after one-step HRE became similar to 5μm, after two-step HRE at 250, 300 and 350°C were 2, 4, 7μm, respectively, resulting in superior mechanical properties at ambient temperature. The microstructure of two-step HRE was finer and uniformer than that of one-step HRE and the strength of one-step and two-step HRE were similar, moreover, the elongation of one-step HRE was improved markedly than that of two-step HRE. Dynamic recrystallization and adjacent grain broking during HRE is introduced to explain the effects of one-step and two-step HRE on the microstructure and mechanical properties of AZ31 Mg alloy. The current results imply that the simple HRE method might be a feasible processing method for industry applications, and the multiply steps extrusion are effective to fabricate high strength of fine grained hcp metals.

scholarly journals Degradation and Biocompatibility of AZ31 Magnesium Alloy Implants In Vitro and In Vivo: A Micro-Computed Tomography Study in Rats

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 473 ◽  
Author(s):  
Naohiko Kawamura ◽  
Yuya Nakao ◽  
Rina Ishikawa ◽  
Dai Tsuchida ◽  
Masahiro Iijima
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Mg Alloy ◽  
Nanoindentation Test ◽  
Mechanical Degradation ◽  
Micro Computed Tomography ◽  
Bone Implant ◽  
Az31 Mg Alloy ◽  
Degradation Rates

In current orthodontic practice, miniscrew implants (MSIs) for anchorage and bone fixation plates (BFPs) for surgical orthodontic treatment are commonly used. MSIs and BFPs that are made of bioabsorbable material would avoid the need for removal surgery. We investigated the mechanical, degradation and osseointegration properties and the bone-implant interface strength of the AZ31 bioabsorbable magnesium alloy to assess its suitability for MSIs and BFPs. The mechanical properties of a Ti alloy (TiA), AZ31 Mg alloy (MgA), pure Mg and poly-L-lactic acid (PLA) were investigated using a nanoindentation test. Also, pH changes in the solution and degradation rates were determined using immersion tests. Three-dimensional, high-resolution, micro-computed tomography (CT) of implants in the rat femur was performed. Biomechanical push-out testing was conducted to calculate the maximum shear strength of the bone-implant interface. Scanning electron microscopy (SEM), histological analysis and an evaluation of systemic inflammation were performed. MgA has mechanical properties similar to those of bone, and is suitable for implants. The degradation rate of MgA was significantly lower than that of Mg. MgA achieved a significantly higher bone-implant bond strength than TiA. Micro-CT revealed no significant differences in bone density or bone-implant contact between TiA and MgA. In conclusion, the AZ31 Mg alloy is suitable for both MSIs and BFPs.

Numerical Simulation and Experimental Verification of Microstructure Evolution during the Seamless Tube Extrusion of Semi-Continuous Casting AZ31 Magnesium Alloy

2017 ◽  
Vol 898 ◽  
pp. 79-85
Author(s):  
Tao Lin ◽  
Ji Xue Zhou ◽  
Bai Chang Ma ◽  
Yun Teng Liu ◽  
Di Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Continuous Casting ◽  
Dynamic Recrystallization ◽  
Volume Fraction ◽  
Seamless Tube ◽  
Compression Tests ◽  
Extrusion Speed ◽  
Tube Extrusion ◽  
Az31 Mg Alloy

Based on the stress-strain curves at the temperature of 300-450 °C with strain rate of 0.01-1 s−1 by hot compression tests, the empirical dynamic recrystallization models for the semi-continuous AZ31magnesium alloy were developed. The dynamic recrystallization evolution during the seamless tube extrusion of the AZ31 Mg alloy was simulated by numerical method with the derived models and validated by experiment measurements. The results show that at certain extrusion speed the influence of the extruding temperature on the dynamic recrystallization fraction was significant. With the increase of the extruding temperature the volume fraction of dynamic recrystallization increase obviously. The predicted dynamic recrystallization fraction was in an excellent agreement with the experimental results.

scholarly journals Effect of Samarium on the Microstructure and Corrosion Resistance of AZ91 Magnesium Alloy Treated by Ultrasonic Vibration

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2331 ◽  
Author(s):  
Yang Chen ◽  
Zheng Yin ◽  
Hong Yan ◽  
Guo-Hua Zhou ◽  
Xiao-Quan Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Ultrasonic Vibration ◽  
Volume Fraction ◽  
Galvanic Corrosion ◽  
Corrosion Current ◽  
Az91 Alloy ◽  
Uniform Corrosion ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

The effects of samarium (Sm) on the microstructure and corrosion behavior of AZ91 magnesium alloy treated by ultrasonic vibration were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and electrochemical measurements. The results showed that the addition of Sm resulted in the formation of Al2Sm, which reduced the volume fraction of the β-Mg17Al12 phase and changed its morphology to fine granular. The AZ91–Sm alloys treated by ultrasonic vibration revealed relatively lower weight loss, hydrogen evolution, and corrosion current density values compared to the ultrasonic-treated AZ91 alloy prepared without Sm. Locally, a coarse β phase in the ultrasonic-treated AZ91 alloy accelerated the possibility of micro-galvanic corrosion growing into the matrix. In the prepared AZ91–Sm alloys treated by ultrasonic vibration, the fine β and Al2Sm phases reduced the probability of micro-galvanic corrosion growth and, therefore, formed a uniform corrosion layer on the surface of the alloys.

One-step synthesis of lamellar molybdate pillared hydrotalcite and its application for AZ31 Mg alloy protection

2009 ◽  
Vol 11 (2) ◽  
pp. 376-381 ◽  
Author(s):  
Xiang Yu ◽  
Jun Wang ◽  
Milin Zhang ◽  
Piaoping Yang ◽  
Lihui Yang ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
One Step

Effect of Restored Energy Items in Recrystallization Simulation of AZ31 Magnesium Alloy

2021 ◽  
Vol 1035 ◽  
pp. 827-832
Author(s):  
Jin Lin Xiong ◽  
Yan Wu ◽  
Qiang Luo ◽  
Ji Bing Chen ◽  
Wei Dong Cheng
Keyword(s):  
Magnesium Alloy ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Impact Factors ◽  
Az31 Mg Alloy ◽  
Simulation Results ◽  
The Impact

The effect of restored energy items in recrystallization simulation of AZ31 Mg alloy was studied with multi-order phase field model, and the impact factors during the recrystallization were discussed by changing the parameters of the restored energy item. The simulation results showed that the greater the restored energy, the greater the number of the recrystallized grains.

Characterization and Structure Analysis of the Anodic Film Formed on AZ31 Mg Alloy in KOH Alkaline Solution with Various Additives

2018 ◽  
Vol 786 ◽  
pp. 159-164
Author(s):  
K. Nishinaka ◽  
S.A. Salman ◽  
K. Kuroda ◽  
M. Okido
Keyword(s):  
Magnesium Alloy ◽  
Anodic Polarization ◽  
Polarization Measurement ◽  
Anodic Film ◽  
Mg Alloy ◽  
Alkaline Solutions ◽  
Nacl Solution ◽  
Alloy Specimen ◽  
Pitting Potential ◽  
Az31 Mg Alloy

AZ31B Mg alloy was anodized under the current density of 20 mA cm-2 for 3.6 ks in KOH alkaline solutions contains 0.60 M KF, 0.09 M Na3PO4.12H2O, 0.45 M Al (OH)3and 0.13 M KMnO4at 298 °C. Pores structure anodic film was formed on magnesium alloy surface; the pours structure was also observed in the lower part of the anodic film. The anodic film consisted of MgO and MgAl2O4. The anodized film showed higher pitting potential from anodic polarization measurement in 0.1 M NaCl solution compared to non-anodized magnesium alloy specimen and leads to improve the corrosion resistance of anodized AZ31 magnesium alloy.

scholarly journals Comparison of Corrosion Resistance and Cytocompatibility of MgO and ZrO2 Coatings on AZ31 Magnesium Alloy Formed via Plasma Electrolytic Oxidation

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 441 ◽  
Author(s):  
Shimeng Wang ◽  
Lingxia Fu ◽  
Zhenggang Nai ◽  
Jun Liang ◽  
Baocheng Cao
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Corrosion Properties ◽  
Az31 Mg Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

In this work, one coating is comprised of ZrO2 and the other consists of MgO as main phase composition was produced on AZ31 magnesium alloy using one-step plasma electrolytic oxidation (PEO). The purpose of this work was to study the corrosion resistance and cytocompatibility of the above-coated AZ31 magnesium alloys in order to provide a basis for AZ31 Mg alloy’s clinical applications of biomedical use. The morphology and phase composition of the coatings were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion properties were examined using electrochemical testing, hydrogen evolution measurements, and immersion tests in a simulated body fluid (SBF). Compared with bare magnesium and the MgO coating, the ZrO2-containing coating exhibited an improved corrosion resistance. Cell proliferation assays and cell morphology observations showed that the ZrO2-containing coating was not toxic to the L-929 cells. The ZrO2 coating was much denser and more homogeneous than the MgO coating, hence the corrosion resistance of the ZrO2-coated AZ31 Mg alloy was superior and more stable than the MgO-coated AZ31 Mg alloy, and ZrO2/AZ31 did not induce a cytotoxic reaction to L-929 cells and promote cell growth.

scholarly journals Corrosion resistance and superhydrophobicity of one-step polypropylene coating on anodized AZ31 Mg alloy

2020 ◽  
Author(s):  
Zhao-Qi Zhang ◽  
Li Wang ◽  
Mei-Qi Zeng ◽  
Rong-Chang Zeng ◽  
Cun-Guo Lin ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
One Step
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