Structure and mechanical properties of iron foil electrodeposited in super gravity field

Liu, Ting; Guo, Zhen; Wang, Zhi; Wang, Mingyong

doi:10.1016/j.surfcoat.2010.02.060

Cited by 13 publications

(5 citation statements)

References 43 publications

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“…Ni and Fe foils were electrodeposited under a supergravity field in our previous studies . It was found that the grains of all metal foils were refined by using a supergravity field.…”

Section: Functional Films Obtained Under a Supergravity Fieldsupporting

confidence: 71%

“…For Fe foils, the roughness was reduced from 21 to 6 nm with an increase of G from 1 to 354. As a result, the tensile strength increased from 264 to 719 MPa and the hardness increased from 176 to 478 Hv . The relationship between the grain size and the mechanical properties can be represented by the well‐known Hall–Petch equation [Eqs.…”

Section: Functional Films Obtained Under a Supergravity Fieldmentioning

confidence: 99%

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Progress toward Electrochemistry Intensified by using Supergravity Fields

Wang

Gong

et al. 2015

ChemElectroChem

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Supergravity fields with high gravity acceleration can promote interphase ship velocity and convection velocity. Over the past decade, research has been devoted to enhancing electrochemical reactions by using supergravity fields. The enhancement of electrochemical reactions is ascribed to the acceleration of mass transfer and bubble separation. In this Minireview, the intensification kinetics of a supergravity field on mass transfer and bubble separation during electrochemical reactions are analyzed theoretically. The progress in terms the enhancement of electrochemical reactions (such as metal electrodeposition, water electrolysis, and chloralkali electrolysis) under a supergravity field is reviewed. The structures and properties of functional films electrodeposited under a supergravity field on both the cathode and the anode are summarized. The Minireview is helpful to understand the effect of the mechanism of the supergravity field on electrochemical reactions and to expand potential applications.

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“…Ni and Fe foils were electrodeposited under a supergravity field in our previous studies . It was found that the grains of all metal foils were refined by using a supergravity field.…”

Section: Functional Films Obtained Under a Supergravity Fieldsupporting

confidence: 71%

Section: Functional Films Obtained Under a Supergravity Fieldmentioning

confidence: 99%

Progress toward Electrochemistry Intensified by using Supergravity Fields

Wang

Gong

et al. 2015

ChemElectroChem

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show abstract

“…速率和强化电化学反应速率的特性 [8][9][10] , 将超重力技术应用到电沉积过程中, 可以达到改善产物性能的目的 [11][12][13][14][15] . 前期研究已发现, 在超重力条件下电沉积的 Ni/Fe 箔, 晶粒细化, 表面更平整, 粗糙度降低, 金属箔的机械性能和抗腐蚀性能均得到明显的改善 [14][15] .…”

Section: 超重力技术具有促进微观混合、增强相间分离unclassified

NiW Alloys Electrodeposited under Super Gravity Field and Their Anti-Corrosion Properties in Alkaline Solutions

Wang¹,

Wang²,

Zhancheng³

2010

Acta Physico-Chimica Sinica

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： NiW alloys were electrodeposited under a super gravity field. The effects of super gravity on the partial current density, W content, and cell voltage were studied. The surface morphologies of the NiW films were characterized by scanning electron microscopy (SEM). The anti-corrosion properties and stability of the NiW films in NaOH solution were also studied by Tafel, electrochemical impedance spectroscopy (EIS), and 144 h exposure test. The results indicate that the W content increases with the gravity coefficient (G) and no cracks are produced on the surface of the NiW alloys electrodeposited under the super gravity field. Compared with those electrodeposited under normal gravity conditions, the self-corrosion potentials of the NiW alloys electrodeposited under a super gravity field shifts in a positive direction and the self-corrosion current densities become smaller. Meanwhile, the corrosion resistance also increases from 865 to 2305 Ω•cm 2 with an increase in the G value from 1 to 256. After 144 h exposure in 10% (w) NaOH solution, no surface peeling or damage occur. We conclude that when the NiW alloy is electrodeposited under a super gravity field, both the anti-corrosion resistance and the stability of the NiW alloy in the NaOH solution are improved obviously.

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“…In a supergravity field, differences between the melting points or densities of the solid particles and the liquid melts result in particles being distributed and separated gradually along the centrifugal direction . The technology has been successfully applied to electrochemical deposition, − enrichment of valuable elements from slags, − treatment of wastes, , fabrication of functionally graded materials, − and removal of impurities from alloys or metals. − Low-melting-point metals (Pb and Sn) have been recovered from PCBs by supergravity separation in a previous study . The main objective of the present study was to recover Cu from PCB residues and to concentrate the remaining precious metals (Au, Ag, and Pd) in the final residues.…”

Section: Introductionmentioning

confidence: 97%

Supergravity Separation for Cu Recovery and Precious Metal Concentration from Waste Printed Circuit Boards

Meng

Zhong

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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Printed circuit boards (PCBs) contain both valuable metals and hazardous materials, thereby rendering them attractive secondary sources of metals, but also environmental contaminants. Thus, we herein report the use of supergravity separation for the recovery of copper (Cu) and the concentration of precious metals present in waste PCBs. At an optimized temperature of 1300 °C, a gravity coefficient of 1000, and a separation time of 5 min, the total recoveries of Cu, Zn, Pb, and Sn over the whole separation process were 97.80%, 95.59%, 98.29%, and 97.69%, respectively. Compared with the amounts of precious metals present in the original PCBs, the contents of Ag, Au, and Pd in the Cu alloy increased by 5.16, 2, and 1.85 times, respectively, while those in the final residues increased by 2.92, 1.59, and 1.54 times, respectively. Upon combination of the appropriate hydrometallurgical process and supergravity separation of metals or alloys, this clean and efficient process provides a new way to recycle valuable metals and effectively prevent environmental pollution from PCBs.

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Structure and mechanical properties of iron foil electrodeposited in super gravity field

Cited by 13 publications

References 43 publications

Progress toward Electrochemistry Intensified by using Supergravity Fields

Progress toward Electrochemistry Intensified by using Supergravity Fields

NiW Alloys Electrodeposited under Super Gravity Field and Their Anti-Corrosion Properties in Alkaline Solutions

Supergravity Separation for Cu Recovery and Precious Metal Concentration from Waste Printed Circuit Boards

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