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Fuhui Cui,Junjie Wang1,Xiangdong Gan,Dawei Yu,Ilya Vladimirovich Okulov,Qinghua Tian,Xueyi Guo 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Liquid Mg is capable of quickly eroding the refractory Ni-based superalloy and selectively dissolve Ni, which opens up anew avenue for the recycling of superalloy scraps for comprehensive metal reclamation. This study aims at investigating theunderlining mechanism and kinetics of the selective dissolution of Ni from Inconel 718 (one type of Ni-based superalloy)with liquid Mg, by experimenting at 750, 800, and 850 °C for various amounts of time in an inert atmosphere. This selectivedissolution process is also known as liquid metal dealloying. Results show that a permeable dealloyed layer was formedresulting from the preferential dissolution of Ni over other metallic elements (e.g., Fe, Cr, Nb, Mo, and Ti). At the dealloyingforefront, the grain boundaries of the matrix γ phase were preferentially eroded by liquid Mg. The opposite concentrationgradients of Ni (4–9 wt%) and Mg (12–18 wt%) cross the dealloyed layer suggested their counter diffusion. A higher heatingtemperature substantially increased the dealloying rate.
Zhengyi Xu,Pengyuan Zhang,Bo Zhang,Bing Lei,Zhiyuan Feng,Junyi Wang,Yawei Shao,Guozhe Meng,Yanqiu Wang,Fuhui Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
In this work, electrochemical hydrogen permeation tests were carried out to obtain the steady-statehydrogen permeation current of X70 pipeline steel in acid environment and alkaline electrolyte withapplied cathodic overpotentials simulating the service conditions of pipelines. It is shown that Lamicroalloyingcan efficiently reduce the steady-state hydrogen permeation current density while maintainingthe same mechanical performance. The experimental permeation data were fitted with Iyer-Pickering-Zamanzadeh (IPZ) and surface effect model to analyze the inhibitive mechanism on hydrogenpermeation, and the results depicted that La element on the material surface greatly facilitates the desorptionprocess of hydrogen atoms. In addition, the calculated hydrogen diffusion coefficient was foundsmaller after La microalloyed, which can be ascribed to the larger hydrogen trap density. It is suggestedthat La-microalloying can mitigate hydrogen damage of X70 pipeline steel in both acidic environment orunder cathodic protection.
Dealloying Superalloy by Liquid Mg for the Selective Extraction of Ni
Fuhui Cui,Junjie Wang,Xiangdong Gan,Dawei Yu,Ilya Vladimirovich Okulov,Qinghua Tian,Xueyi Guo 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
Liquid Mg is capable of quickly eroding the refractory Ni-based superalloy and selectively dissolve Ni, which opens up anew avenue for the recycling of superalloy scraps for comprehensive metal reclamation. This study aims at investigating theunderlining mechanism and kinetics of the selective dissolution of Ni from Inconel 718 (one type of Ni-based superalloy)with liquid Mg, by experimenting at 750, 800, and 850 °C for various amounts of time in an inert atmosphere. This selectivedissolution process is also known as liquid metal dealloying. Results show that a permeable dealloyed layer was formedresulting from the preferential dissolution of Ni over other metallic elements (e.g., Fe, Cr, Nb, Mo, and Ti). At the dealloyingforefront, the grain boundaries of the matrix γ phase were preferentially eroded by liquid Mg. The opposite concentrationgradients of Ni (4–9 wt%) and Mg (12–18 wt%) cross the dealloyed layer suggested their counter diffusion. A higher heatingtemperature substantially increased the dealloying rate.
Secure Beamforming Designs for Secrecy MIMO SWIPT Systems
Zhu, Zhengyu,Chu, Zheng,Zhou, Fuhui,Niu, Hehao,Wang, Zhongyong,Lee, Inkyu IEEE 2018 IEEE wireless communications letters Vol.7 No.3
<P>In this letter, secure beamforming designs are investigated in a multiple-input multiple-output secrecy channels with simultaneous wireless information and power transfer. In order to achieve fairness among different multiple energy harvesting receivers, the minimum harvested energy is maximized under the secrecy rate requirements. In particular, in order to reduce the computational complexity of the semidefinite programming problem, a successive convex approximation (SCA) iterative algorithm is proposed in the perfect channel state information (CSI) case to obtain a near-optimal rank-one solution. Moreover, the original problem is extended to the imperfect CSI case by incorporating a norm-bounded error model, where an SCA-based iterative algorithm is also proposed. Simulation results reveal that the SCA-based iterative algorithm achieves the same performance as the semidefinite relaxation method with reduced complexity.</P>
Ascorbic acid as corrosion inhibitor for Q235 mild steel in acidic environments
Maduabuchi A. Chidiebere,Emeka E. Oguzie,Li Liu,Ying Li,Fuhui Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
The inhibition effect of ascorbic acid (AA) on mild steel corrosion in 1 M HCl and 0.5 M H2SO4 was estimated using electrochemical and surface probe techniques. Potentiodynamic polarization results showed AA to be a mixed type inhibitor in both acidic environments, whereas the impedance results revealed adsorption of the AA species on the steel surface. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) studies revealed the formation of a protective film adsorbed AA on the steel surface. Quantum chemical calculations were used to confirm the ability of AA to adsorb on a steel surface.