Jiangsu Konsung Equipment Co.

Danyang, China

Jiangsu Konsung Equipment Co.

Danyang, China
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Zhang X.,Nanjing Institute of Technology | Ma Q.,Nanjing Institute of Technology | Ba Z.,Nanjing Institute of Technology | Wang Z.,Nanjing Institute of Technology | Wang Q.,Jiangsu Konsung Equipment Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2017

Mg-(4-x)Nd-xGd-0.3Sr-0.2Zn-0.4Zr (x=0, 1, 3, wt%) alloys were solution treated. Then, their microstructures and phases were studied using scanning electron microscope (SEM), energy dispersive spectrometer and X-ray diffraction. The corrosion rates of the alloys in simulated body fluid were evaluated by mass loss and hydrogen evolution tests, and the corrosion morphologies were observed by SEM. Results show that the grain size of the alloy with 1%Gd addition is the finest, as well as the lowest corrosion rate, and the second phase is located relatively continuously around the matrix. In contrast, the grain size of the alloy with 3%Gd addition is the coarsest and the corrosion rate is the highest. Besides, the three alloys exhibit relatively uniform corrosion morphologies. © 2017, Science Press. All right reserved.


Zhang X.,Nanjing Institute of Technology | Zhang X.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | Wang Q.,Nanjing Institute of Technology | Wang Q.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | And 6 more authors.
Materials Letters | Year: 2015

Mg-5Gd-1Zn-0.6Zr (GZ51K, wt%) alloy was heat treated at different temperatures in order to study the effect of long period stacking ordered (LPSO) structure on corrosion behavior of the alloy for biomedical applications. The results show that the volume fraction of the LPSO structure increases firstly, then decreases and disappears with increasing heat treatment temperature. The LPSO structure is of great importance to the corrosion behavior of the alloy. More volume fraction of the LPSO structure leads to better corrosion resistance of the alloy, while the GZ51K alloy without the LPSO structure shows rapid corrosion rate and severely localized corrosion. © 2014 Elsevier B.V. All rights reserved.


Zhang X.B.,Nanjing Institute of Technology | Zhang X.B.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | Sun W.,Nanjing Institute of Technology | Sun W.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | And 5 more authors.
Materials Research Innovations | Year: 2015

Mg-(4-x)Nd-x Gd-0·3Sr-0·2Zn-0·4Zr (wt.-%, x=0, 1, 2, and 3) alloys with various Gd/Nd ratios were prepared by gravity casting, solution-treated and then hot extruded. The microstructures, mechanical properties at room temperature, corrosion behaviour in simulated body fluid of the as-extruded alloys were studied. The as-extruded alloys undergo partially dynamic recrystallisation, and the equiaxed grains become coarse with increasing Gd/Nd ratio. The strength of the alloys increases first and then decreases with increasing the Gd/Nd ratio; however, the elongation of the alloys increases apparently with increasing Gd/Nd ratio. Both immersion test and polarisation test indicate that the corrosion rate of the as-extruded alloys is reduced with increasing the Gd/Nd ratio, and the alloys exhibit relatively uniform corrosion morphologies. © W. S. Maney & Son Ltd 2015.


Zhang X.-B.,Nanjing Institute of Technology | Zhang X.-B.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | Ba Z.-X.,Nanjing Institute of Technology | Ba Z.-X.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | And 5 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

Mg-2.2Nd-xSr-0.3Zr alloys (x=0, 0.4 and 0.7, mass fraction, %) were prepared by gravity casting. Solution treatment was conducted on the as-cast alloys to homogenize microstructure, and hot extrusion was subsequently conducted. Microstructure was observed using an optical microscope and a scanning electron microscope. Biocorrosion behaviors of the alloy in simulated body fluid were analyzed by mass loss, hydrogen evolution and Tafel polarization experiments. The results show that the amount of residual eutectic phase of the solution treated alloys increases with increasing Sr addition, and the grains are significantly refined after hot extrusion. The corrosion resistance of the solution treated alloys deteriorates apparently with increasing Sr addition, while the corrosion resistance of the as-extruded alloys is improved with Sr addition. Nevertheless, the biocorrosion behavior of the as-extruded alloys obtained by Tafel polarization shows different trends from those obtained by the other two methods. © 2014 The Nonferrous Metals Society of China.


Zhang X.-B.,Nanjing Institute of Technology | Zhang X.-B.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | Yin Q.,Nanjing Institute of Technology | Yin Q.,Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology | And 7 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2016

In order to improve the mechanical and corrosion properties of biomagnesium alloy, the aging treatments at different temperatures were conducted on the as-extruded Mg-3Gd-1Nd-0.3Sr-0.2Zn-0.4Zr alloy. The effects of the aging temperature on microstructure, room-temperature mechanical properties and corrosion properties in simulated body fluid of the alloy were studied. The results show that the Zr-rich needle-like precipitate is observed. The microhardness and yield strength of the alloy after aging treatment are higher than those of the as-extruded alloy, and they first increase and then decline with increasing aging temperature. The highest microhardness and yield strength are obtained at the aging temperature of 185 ℃. The corrosion rate of the alloy first decreases and then increases with increasing aging temperature, and the lowest corrosion rate of the alloy is acquired aged at 230 ℃, which is only 52%±7% compared to that of the as-extruded alloy obtained by mass loss test. © 2016, Central South University of Technology. All right reserved.


Zhang X.B.,Nanjing Institute of Technology | He X.C.,Nanjing Institute of Technology | Xue Y.J.,Nanjing Institute of Technology | Wang Z.Z.,Nanjing Institute of Technology | Wang Q.,Jiangsu Konsung Equipment Co.
Corrosion Engineering Science and Technology | Year: 2014

Mg-2·2Nd-xSr-0·3Zr alloys (wt-%, x50, 0·4, 0·7 and 2·0) were prepared by gravity casting to study the effects of Sr addition on the microstructure and corrosion resistance of Mg-Nd-Zr alloys in simulated body fluid (SBF). Phases were identified by X-ray diffraction, and microstructure was observed with optical microscopy and scanning electron microscopy. Corrosion resistance of the alloys was determined by evaluating mass loss and hydrogen evolution during immersion in SBF. Mg17Sr 2 phase was formed, and the grain size decreased with additional Sr addition. For the grain refinement and more continuous second phase, which could improve the corrosion resistance, the alloy with 0?7 wt-%Sr showed the slowest corrosion rate, whereas the alloy with 2?0 wt-% showed the fastest corrosion rate due to the increased volume fraction of Mg17Sr2, which led to severe local microgalvanic corrosion.


Zhang X.B.,Nanjing Institute of Technology | He X.C.,Nanjing Institute of Technology | Xue Y.J.,Nanjing Institute of Technology | Wang Z.Z.,Nanjing Institute of Technology | Wang Q.,Jiangsu Konsung Equipment Co
Materials Technology | Year: 2014

Mg-(4-x)Nd-xGd-0?3Sr-0?2Zn-0?4Zr (wt-%, x50, 1, 2 and 3) alloys were prepared by gravity casting. Microstructure was analysed by X-ray diffraction, optical microscopy and scanning electron microscopy respectively. The a-Mg and Mg41Nd5 phases existed in the as cast alloys with 4% and 3% Nd addition, while the new Mg3Gd was found in the alloys with 3% Gd addition. The volume fraction of the second phase reduced with increasing Gd addition and the microstructure was refined by the Gd addition. The corrosion resistance of the alloys was evaluated by mass loss, hydrogen evolution and Tafel polarisation tests. The results showed that the corrosion rate of the alloys decreased with increasing Gd addition even though the corrosion rates of the alloys obtained by different methods showed different values. Moreover, the corrosion morphologies of the alloys were uniform. © 2014 W. S. Maney and Son Ltd.


Ba Z.,Nanjing Institute of Technology | Ba Z.,Jiangsu Province Advanced Structural Materials and Application Technology Laboratory | Zhang X.,Nanjing Institute of Technology | Zhang X.,Jiangsu Province Advanced Structural Materials and Application Technology Laboratory | And 4 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2015

The hydrotalcite (Mg6Al2(OH)16CO3·4H2O) film was prepared on magnesium alloy by ultrasonic wave, and the effect of power and frequency of ultrasonic wave on its microstructure and corrosion resistance was also investigated. The surface morphology and phase composition were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), respectively. The polarization curve and electrochemical impedance spectroscopy (EIS) were applied to evaluate the anti-corrosion performance. The results show that the film formation can be significantly accelerated by ultrasonic-assisted treatment. The film forming rate increases with the ultrasonic power and frequency, while the quality of film will be deteriorated through overwork. When the ultrasonic power and frequency was 100 W and 80 kHz, respectively, a thicker and integrated layer was formed on the magnesium alloy. Its corrosion resistance was superior to that of the bare magnesium alloy, and the corrosion current density was approximately 1/20 that of the substrate. © 2015, Chongqing Functional Materials Periodical Press Co. Ltd. All right reserved.


Fang X.-X.,Nanjing Institute of Technology | Zhang X.-B.,Nanjing Institute of Technology | Wang Q.,Jiangsu Konsung Equipment Co. | Ba Z.-X.,Nanjing Institute of Technology | Wang Z.-Z.,Nanjing Institute of Technology
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2014

The NaMgF3 films on the surface of Mg-Nd-Zn-Zr magnesium alloy were fabricated by immersion method. Their corrosion properties were valuated by dripping test, electrochemical test and immersion method, respectively. The microstructures of the original and corrosive samples were observed by SEM and their chemical compositions were analyzed by EDS. The results show that the size of NaMgF3 particle is obviously reduced with the increase of conversion treatment temperature; however, it is little affected by the conversion treatment time. The NaMgF3 particles grow by two-dimensional nucleation, step growth mechanism and screw growth mechanism. The average hydrogen evolution rate of Mg-Nd-Zn-Zr magnesium alloy in simulated body fluid (SBF) solution can be significantly decreased by NaMgF3 film. The NaMgF3 films gradually transform into a new film consisting of fluoride and phosphate in the SBF solution, which will continue to protect the magnesium alloy from the corrosion.


Zhang X.,Nanjing Institute of Technology | Ba Z.,Nanjing Institute of Technology | Wang Z.,Nanjing Institute of Technology | He X.,Nanjing Institute of Technology | And 2 more authors.
Materials Letters | Year: 2013

Silver (Ag) exhibits antibacterial properties and biocompatibility in human body, and can enhance mechanical properties of magnesium alloys. Influence of Ag addition (0, 0.2, 0.4 and 0.8 wt%) on microstructure and corrosion behavior of Mg-Nd-Zn-Zr alloys was investigated in this study. Chemical composition, phase, microstructure and corrosion behavior of the alloys were studied. The microstructure was refined with increasing Ag addition, and the volume of the second phase increased. Ag was found in the second phase. Both the mass loss and hydrogen evolution test results showed that the alloy with 0.2 wt% Ag addition exhibited corrosion resistance that approximatied that of the alloy without Ag addition in simulated body fluid, while the corrosion resistance declines apparently with increasing Ag addition. © 2013 Elsevier B.V.

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