• Title/Summary/Keyword: Bath Composition

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Effect of the electrolyte composition and the plating condition on the hardness of zinc deposit in the sulfate bath (황산아연욕에서 도금층 경도에 미치는 욕조성 및 도금조건의 영향)

  • 김명수;김영근
    • Journal of the Korean institute of surface engineering
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    • v.33 no.5
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    • pp.356-364
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    • 2000
  • Factors that affect the hardness of the zinc electrodeposits in the sulfate electrolyte were investigated. The hardness of zinc deposit was enhanced by increasing the concentration of impurities such as iron and nickel in the bath that changed the crystallographic orientation of the zinc deposit from the strong basal plane to the random orientation. The increase of the concentration of sodium sulfate and current density in iron contained bath improved the hardness of zinc deposit because those were easily codeposited in zinc layer. However the increase of the concentration of sodium sulfate up to 80g/$\ell$ in the bath darkened the surface of zinc electrodeposits due to change of morphology by the codeposition of iron.

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Effect of current density, temperature and electrolyte concentration on Composition of Zn-Ni Electrodeposits (Zn-Ni도금의 합금화에 미치는 전류밀도, 온도와 전해액농도의 영향)

  • Kang, Soo Young
    • Journal of the Korea Convergence Society
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    • v.8 no.11
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    • pp.307-312
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    • 2017
  • In the industry, galvanizing using the principle of sacrificial anode is used Zn-Ni alloy plating was developed as one of the measures to increase the corrosion resistance rather than pure zinc plating. The alloy plating layer has a corrosion resistance of 4-5 times that of the pure zinc plating layer, so that it is applied to automotive parts requiring high corrosion resistance even though the plating cost is high. The amount of Zn-Ni alloy plating solution is a sulfuric acid bath, a chlorinated bath, an alkali bath, and an ammonia bath. Here, the influence of the electrolytic conditions on the composition of the alloy plating in the chloride bath was investigated. The results are explained by the cathode overvoltage and the diffusion coefficient. In general, as the overvoltage of the cathode increases, the concentration polarization becomes more important than the activation polarization. The concentration polarization is determined by element diffusion in the diffusion layer. That is, as the overvoltage of the cathode increases, the Zn content having a large diffusion coefficient increases.

Effect of Bath Composition on Characteristics of Coating Layer in Al-Si Coating Bath (AL 도금욕 첨가 성분에 따른 도금층 특성)

  • Bae, Dae-Cheol;Im, Tae-Hun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2012.05a
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    • pp.286-286
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    • 2012
  • 기존 용융아연 도금강판 대체시 단면내식 품질특성을 효과적으로 확보할 수 있는 신 성분계 강판으로서, 용융AL 도금계를 이용함에 있어 제3의 원소를 첨가하여 내식성, 조도, 광택, 조직 등 도금층 특성을 확인하였으며 특히 나내식성 및 단면내식성에 초점을 두어 관찰하였다.

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The effect electrolysis conditiong on the composition and the preferred orientation of Co-Fe-Cr alloy electrodeposits (Co-Fe-Cr 합금도금층의 조성 및 우선방위에 미치는 전해조건의 영향)

  • 예길촌;문근호
    • Journal of the Korean institute of surface engineering
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    • v.31 no.6
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    • pp.393-399
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    • 1998
  • The composition and the properred orientation of Co-Fe-Cr alloy electrodeposits were invesigated according to the electrolysis conditions using sulface bath. The current efficiency and the cathode overpotential decrased noticeably with the increase of Cr content in the bath. As the D.C. current density increased increased, the Cr content in the alloy increasd, while Co content decreased and Fe content remained constant, In the pulse current electrolysis, the Cr content of the alloy increased with the mean current density and off-time and then its content increased mord more noticeably with the peak current density than that of D.C. electrolysis. The preferred orientation of the alloy changed from (220)+(111) to (220) with decreasing cathode overpotential.

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Composition and Microstructure of Sn-Ni alloys Electrodeposits according to the Electrodeposits conditions (전해조건에 따른 Sn-Ni 합금도금층의 조성 및 조직 특성)

  • 예길촌;문근호;채영욱
    • Journal of the Korean institute of surface engineering
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    • v.30 no.3
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    • pp.202-212
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    • 1997
  • The composition and the microstructure of the Sn-Ni alloy electrodeposited in pyrophosphate bath were investigated according to the electrolysis conditions. The cathode current efficiency increased with the addition of $NH_4CI$ and glycine, while it decreased with the increase of current density. The Sn content of the alloy deposits increased with the increase of $NH_4CI$ in the bath. The alloys with 51~71wt.% Sn had the NiSn single phase structure. The preferred orientation of the single phase alloys changed from (110) to (110)+(101) with the increase of current density and cathode overpotential. The single phase alloys with 50~60wt.%Sn had the smooth surface structure with fine crystallite, while the multiphase alloys showed the surface structure with crystal size and cracks at high curret density.

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Ni-Co Alloy Electroforming for Micro Mold Fabrication (마이크로 금형 제작을 위한 니켈-코발트 합금 전주기술개발)

  • Shin S. H.;Jeong M. K.;Kim Y. S.;Han S. H.;Hur Y. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.276-279
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    • 2004
  • The factors affecting Ni-Co alloy electroforming were investigated to determine the optimum bath composition and electroplating parameters, like pH, temperature, and current density, suitable for high speed fabrication of a micro mold with longer lifetime. To obtain alloy deposits having uniform thickness and composition, electroplating parameters were finely tuned with home-made electroforming apparatus. Ni-Co alloy deposits had linearly increased Co with $Co^{2+}$ ion concentration in electroplating bath, and showing $412H_v$ of Victors hardness at $23wt\%$ of Co content. For Ni-Co alloy, sulfonate and diol related organic additives were very effective to alleviate its residual stress and surface roughness. The maximum deposition rate was $106{\mu}m/hr$ at 10ASD and the tensile strength of alloy deposit was 2 times larger than that of Ni only case.

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Effect of Solution Compositions on Properties of Ni-Fe Nano Thin Film and Wire Made by Electrodeposition Method (Electrodeposition법으로 제조한 Ni-Fe 나노박막 및 나노선의 특성에 미치는 용액 조성의 영향)

  • Koo, Bon-Keup
    • Journal of the Korean institute of surface engineering
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    • v.43 no.5
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    • pp.243-247
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    • 2010
  • The micro Vickers hardness and internal stress of Ni-Fe metal thin film synthesized by electrodeposition method at $25^{\circ}C$ were studied as a function of bath composition, and surface microstructure and atomic compositions of thin films were investigated by SEM and EDS. And the shape change of $200\;{\AA}$ Ni-Fe nanowires made using anodic aluminum oxide(AAO) templates by electrodeposition method were observed by SEM as a function of ultrasonic treatment time and bath composition. The Fe deposition contents on the substrate non-linearly increased with Fe ion concentration over total metal ion concentration. In case of low Fe contents film, the grain size is smaller and denser than high Fe contents deposited films, and the micro Vickers hardness increased with Fe contents of electrodeposited films. These results affected the shape change of nanowire after ultrasonic treatments.

Fabrication and Properties of Fe-Ni Nano Thin Film and Wire by Electrodeposition Method (Electrodeposition법에 의한 Fe-Ni 나노박막 및 나노선 제조 및 특성)

  • Koo, Bon-Keup;Shin, Dong-Yul;Jung, Woo-Ram;Jung, Sang-Ok;Kim, Dae-Yong;Choi, Mok-Ryeon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.557-558
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    • 2006
  • The mechanical properties of micro-hardness and internal stress of Ni-Fe alloy thin film made by electrodeposition method have been measured as a function of bath composition and current density. And also the microstructure of $200{\AA}$ Ni-Fi nanowires made using anodic aluminum oxide(AAO) templates by electrodeposition method have been observed by SEM as a function of ultrasonic treatment time and bath composition.

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