SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Baoguo Zhang,Li Wang,Yubao Liu,Yongjian Zhang,Lipeng Zhang,Zhongning Shi
Reliable access to Nd-containing mineral resources and their effective future use and recycling are crucial for the sustainable development of industries based on rare earth metals. As a precursor for room-temperature Nd electrodeposition, NdCl 3 is advantageous due to its abundance, low cost, and high availability; however, it is poorly soluble in most specialized ionic liquids and is therefore not widely used in solvometallurgical processes. Herein, we develop a practical means of Nd electrodeposition from a solution of NdCl 3 and AlCl 3 in 1,3-dimethyl-2-imidazolidinone, revealing that Al electrodeposition does not occur at the employed AlCl 3 concentration. Instrumental and electrochemical techniques are used to confirm the electrodeposition of Nd on high-purity Al substrates, and together with theoretical calculations, these techniques are employed to probe the mechanism of NdCl 3 dissolution, the electrolyte structure/composition, and the electrochemical behavior of the Nd-containing electroactive species. Our findings provide a strategy and theoretical basis for the cost-effective electrowinning of rare earth metals from their chlorides as upstream precursors.
研究领域:
冶金学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Shijie Yu,Yuhao Chai,Chenyi Zhu,Kebing Zhu,Li Liu,Xiuli Zhang,Xiaocui Wang,Jun Cao
To improve the tribological performance and corrosion resistance of engine bearings exposed to contaminated lubricating oil , polymer coatings containing NdCl 3 at concentrations of 3.45 wt%, 5.17 wt%, and 6.89 wt% were developed, respectively. These coatings were applied to the surfaces of copper and aluminum alloys using a liquid spraying technique, aiming to assess their corrosion and wear resistance. Electrochemical experiments showed that the coating with a 3.45 wt% NdCl 3 concentration exhibited superior corrosion resistance , as evidenced by the highest self-corrosion potential and polarization resistance. Furthermore, friction tests on the corroded samples revealed that the 3.45 wt% NdCl 3 coating also demonstrated the lowest coefficients of friction and wear rates. This is due to the addition of an appropriate amount of NdCl 3 , which densifies the internal structure of the coating and improves the mechanical properties of the coating, thereby significantly improving its corrosion and wear resistance.
研究领域:
材料科学
·
腐蚀与防护
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2023
·Vol. 54
·期 4
·1675-1686
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IF 3
Fu Yingzheng,Zhang Zhimin,Lu Xuchen,Yan Yan,Pan Binfeng
To increase the reaction driving force and prepare Mg–Nd master alloys, the synergistic interaction between NdCl 3 and NdF 3 was used in the magnesiothermic reduction process in NdCl 3 –NdF 3 -containing molten salt. Thermomechanical analysis was used to investigate the possibility of the synergistic interaction in molten salt. Then the verification of synergistic interaction was conducted by analyzing the composition of the molten salt and the alloys obtained in the magnesiothermic reduction process. After that, the factors affecting synergistic interaction were investigated. At last, the mechanism of the synergistic interaction between NdCl 3 and NdF 3 in molten salt was proposed and discussed. The coupling reaction formed in the magnesiothermic reduction process and the existence of three reaction mechanisms increased the reaction driving force. Mg–RE master alloys with the content of Nd being 25 to 30 wt pct were prepared under the optimum conditions and the conversion rate of NdF 3 was greater than 70.94 pct. The content of Nd and the content of various impurities in the alloys obtained both met the requirements of the commercial Mg–Nd master alloys.
研究领域:
材料科学
·
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 10
·102505
·
IF 4.316
Chenteng Sun,Qian Xu,Yongxiang Yang,Xingli Zou,Hongwei Cheng,Xionggang Lu
The electrochemical behaviors of Li+ and Nd3+ were investigated on W, liquid Sn pool and Sn film electrodes in LiCl-KCl-NdCl3 melt at 673 K. Various electrochemical techniques, such as cyclic voltammogram, square wave voltammogram, and open circuit chronopotentiometry, were conducted to evaluate the electrochemical behaviors of Li+ and Nd3+. The reduction of Nd3+ was found to be a two-step process in the W electrode and a one-step process in the liquid Sn electrode. During the formation of the Nd-Sn intermetallic compounds, only the NdSn3 would be formed without the reduction of the Li+ in the liquid Sn electrode. When the reduction potential moves over −2.77 V vs Cl2/Cl−, the Li+ in the electrolyte would inevitable be reduced into the liquid Sn electrode. The Nd-Sn intermetallic compounds were deposited on the liquid Sn pool electrode at −2.74 V vs Cl2/Cl− in the LiCl-KCl-NdCl3 melts for 5 h. The products were characterized by SEM-EDS and XRD. The loose product on the surface of the deposition displayed the existence of NdSn3 in Nd-Sn intermetallic compounds. The high content of Nd inclusion formed by segregation was detected in the solidified Sn electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）