• Title, Summary, Keyword: Electrodeposits

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A Study on the Recrystallization Texture of Electrodeposits (도금층의 재결정 집합조직에 관한 연구)

  • 홍상철
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.184-187
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    • 1999
  • The texture of electrodeposits is related to microstructure surface morphology and mechanical properties. When the electrodeposits annealed the recrystallization texture many be different from the original deposition texture. the <100> and <110> textures of nickel electrodeposits changed to the <100> and <{{{{ SQRT {310 } }}}}> textures when recrystallized The <100> and <{{{{ SQRT {310 } }}}}> mixed texture is changed to the <100> texture. The <002> texture of Zn electrodeposits didn't changed even after recrystallization.

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Convergent Study of Texture on the Mechanical Properties of Electrodeposits (구리 도금층의 기계적 성질에 미치는 집합조직의 융합연구)

  • Kang, Soo Young
    • Journal of the Korea Convergence Society
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    • v.7 no.6
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    • pp.193-198
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    • 2016
  • The texture of electrodeposits varies with deposition conditions. Texture of electrodeposits is also related to microstructure, surface morphology and mechanical properties. When the electrodeposits annealed, the recrystallization texture may be different from the original deposition texture. The surface morphology, the microstructure and the initial and recrystallization textures of copper electrodeposits vary with deposition conditions. The texture, microstructure, surface morphology and mechanical properties of electrodeposits are known to vary with electrolysis conditions, such as bath composition, over potential, pH, current density, bath temperature, etc. The (111) and (110) textures of copper electrodeposits can be obtained from copper sulfate bath. In this study, copper electrodeposits with (111) and (110) textures are obtained from a copper sulfate bath, and the change from (111) to (110) textures of copper electrodeposits can be explained.

Effect of Phosphorous Acid Concentration on Mechanical Properties of Ni-P Electrodeposits (니켈-인 도금 층의 기계적 성질에 미치는 아인산 농도의 영향)

  • Kang, Soo Young;Yang, Seung gi;Hwang, Woon suk
    • Journal of the Korean institute of surface engineering
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    • v.48 no.3
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    • pp.100-104
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    • 2015
  • The nickel alloys gets a great deal of attention due to their good mechanical, chemical and magnetic properties. Especially Ni-P alloy systems are very attractive due to their good corrosion resistance and the wear resistance in important technological applications. In this study, the effects of phosphorus acid concentration in plating solution on composition of Ni-P alloy coatings were studied. The Ni-P electrodeposits of the various P contents were investigated in order to understand effect of the composition on mechanical properties of Ni-P electrodeposits. The mechanical properties of electrodeposits increased as the P content in electrodeposits increase. The results of mechanical properties were explained by grain size and P solid solution effect. The effects of heat treatment on mechanical properties of Ni-P alloy coatings were also studied.

The change of the hardness and yield strength in the nickel electrodeposits depending upon the electrolysis condition (전해조건에 따른 니켈전착층의 경도와 항복 강도의 변화)

  • 예길촌;김광수
    • Journal of the Korean institute of surface engineering
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    • v.16 no.1
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    • pp.3-9
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    • 1983
  • The change of the hardness and yield strength depending upon the electrolysis conditions was investigated for Watts and bright nickel electrodeposits. The hardness of Watts nickel electrodeposits decreased with increasing current density in the range of 1-15A/Am2, while it increased with increasing bath temperature. The hardness of bright nickel deposits increased noticebly in comparison with that of Watts nickel electro-deposits. The hardness and the yield strength of the bright nickel electrodeposits increased considerably with decreasing current density and the highest value was obtained at the lowest current density (1A/dm2), while they decreased noticebly at the bath temperature of 80$^{\circ}C$ in comparison with that of 40-60$^{\circ}C$. The change of the hardness and the yield strength of bright nickel electrodeposits depending upon the electrolysis conditions could be mainly attributed to the variation of organic additives codeposited in the electrodeposits. The recrystallizatioin temperature(50% softening temperature) of the Wattss and the bright nickel electro-deposits was 520-280$^{\circ}C$ and 350-410$^{\circ}C$ respectively and then the recystallization temperature of bright nickel deposits was lower than that of the Watts nickel electrodeposits.

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The Variation of Texture in Planar isotropic Ni Electrodeposits (평명등방성 Ni 도금층의 집합조직의 변화)

  • 김인수;이세광
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.262-265
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    • 1998
  • Nickel Plating improves on the corrosion resistance of materials in acid and moisture environment. In this study, we investigated the surface morphology, XRD patterns and pole figures of the various types of Ni electrodeposits. The texture of Ni electrodeposits changed from <100> to <111> through <110> with increasing the temperature of electrolyte and the concentration of nickel ion. The texture of Ni electrodeposits changed from <100> to <100> after annealing. Also the <110> texture changed to the <√310> texture after annealing.

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Effects of Platinum Nano Electrodeposits on the Corrosion of Carbon Substrate in an Acidic Environment (백금 나노 도금입자가 산성 환경에서 탄소기판 부식에 미치는 영향)

  • Choe, Min-Ho;Park, Chan-Jin
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.34-35
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    • 2008
  • We investigated the effects of Pt nano electrodeposits on the corrosion of carbon substrate in an acidic solution. The electrodes for experiments were prepared by electrodepositing Pt on carbon substrate in a solution of 5 mM $H_2PtCl_6$ and 0.5 M $H_2SO_4$ using pulse deposition technique. In cyclic voltammograms for the carbon electrodes with and without Pt nano electrodeposits, total anodic current including both currents from oxygen evolution reaction and carbon corrosion increased abruptly above a critical potential. In addition, the critical potential of the carbon electrodes with Pt nano electrodeposits was lower than that of bare carbon electrode. This phenomenon was more prominent at $75^{\circ}C$ than $25^{\circ}C$. In potentiostatic experiments, the current transients and the corresponding power spectral density increased with increasing the applied potential for the electrodes. Furthermore, the current transients for the carbon electrodes with Pt nano electrodeposits were much higher than those for the bare carbon substrate. This indicates that the corrosion of carbon substrate can be highly accelerated by Pt nano electrodeposits.

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Microstructure of zinc electrodeposits in acid sulfate solution (黃酸亞鉛 電解液을 使用한 亞鉛電着層의 顯微鏡 組織)

  • Ye, Gil-Chon;An, Deok-Su;Kim, Yong-Ung
    • Journal of the Korean institute of surface engineering
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    • v.18 no.2
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    • pp.53-60
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    • 1985
  • The microstructure of zine electrodeposits was investigated by using zinc sulfate solution in still bath. The cathode current efficiency decreased with increasing current density, and decreasing temperature. The preferred orientation of the zinc electrodeposits changed from (10.3) texture to(10.${\ell}$)-(00.1)(${\ell}$=1, 2, 3) texture through (10.2)-(10.3) preferred orientation with increasing cathode over potential. The surface morphology of zinc electrodeposits changed from the dendritic growth with granular crystallites to the blocks of hexagonal crystallites packed together with increasing current density. The microstructure of cross section of the above deposits are the rough granular structure and columnar structure respectively.

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The Investigation of Microstructure of Electro-deposited Layer for the Corrosion Resistance on Sheet Steel (강판의 부식방지를 위한 도금층 조직관찰)

  • 김인수;이세광
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.224-227
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    • 1997
  • In Ni and Zn plating, microstructure and corrosion behavior of electrodeposits with various electroplating condition were investigated. Optical microstructure, SEM images and polarization curves of electrodeposits are different with plating time and temperature.

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The effect of electrolyte flow on the microstructure of zinc electrodeposits (亞鉛電着層의 현미경조직에 미치는 電解液흐름의 影響)

  • Ye, Gil-Jae;Kim, Yong-Ung;An, Deok-Su
    • Journal of the Korean institute of surface engineering
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    • v.18 no.4
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    • pp.164-183
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    • 1985
  • The microstructure of the zinc electrodeposits was investigated by changing the flow rate of electrolyte in zinc sulfate Bath. The cathode current efficiency increased with increasing flow rate of electrolyte. The preferred orientation of zinc electrodeposit changed from (11.2) texture to (10.3) or (10.1)+(10.2) texture with increasing current density in the range of flow rate, 0.2-1.2m/sec. The morphology of the deposits changed from the sponge deposit to the blocks of hexagonal crystallites packed together through the structures of find polycrystallite with increasing current density. The microstructure of the cross-section of the above deposits are granular structure and columnar structure respectively. The surface roughness of zinc electrodeposits decreased with increasing current density and flow rate of electrolyte.

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Carbon Corrosion at Pt/C Interface in Proton Exchange Membrane Fuel Cell Environment

  • Choi, Min-Ho;Beom, Won-Jin;Park, Chan-Jin
    • Corrosion Science and Technology
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    • v.9 no.6
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    • pp.281-288
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    • 2010
  • This study examined the carbon corrosion at Pt/C interface in proton exchange membrane fuel cell environment. The Pt nano particles were electrodeposited on carbon substrate, and then the corrosion behavior of the carbon electrode was examined. The carbon electrodes with Pt nano electrodeposits exhibited the higher oxidation rate and lower oxidation overpotential compared with that of the electrode without Pt. This phenomenon was more active at $75^{\circ}C$ than $25^{\circ}C$. In addition, the current transients and the corresponding power spectral density (PSD) of the carbon electrodes with Pt nano electrodeposits were much higher than those of the electrode without Pt. The carbon corrosion at Pt/C interface was highly accelerated by Pt nano electrodeposits. Furthermore, the polarization and power density curves of PEMFC showed degradation in the performance due to a deterioration of cathode catalyst material and Pt dissolution.