• 월간산업보건
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• s.341
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• pp.5-15
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• 2016

• 월간산업보건
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• s.342
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• pp.5-14
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• 2016

• Journal of the Korean institute of surface engineering
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• v.9 no.1
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• pp.9-26
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• 1976

• Polymer(Korea)
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• v.31 no.3
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• pp.184-188
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• 2007

Monodisperse PMMA/HDDA polymer particles were coated via electroless Ni plating using sodium hypophosphite as a reducing agent in an acidic environment. In this study, the effects of 1) the pretreatment conditions, 2) the plating temperature, 3) the plating pH, and 4) the initial pH, control of plating bath on the variation of plating rate, surface state of plated particles and plating reproducibility were investigated. It was observed that every pretreatment steps, especially conditioning and acceleration step, were very important for obtaining uniform Ni plating and the plating rate was increased with the increase of plating temperature and pH. Moreover, the initial pH control of plating bath was critical for the plating reproducibility.

• Applied Chemistry for Engineering
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• v.25 no.3
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• pp.268-273
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• 2014

In this study, multi-walled carbon nanotubes (MWCNT) were treated with nickel by electroless plating method for improving electromagnetic interference (EMI) shielding performance of MWCNT. The physical properties of electroless plated MWCNT were analyzed by using ultra-high resolution scanning electron microscope (UHR-SEM), thermogravimetry (TGA), sheet resistance analyzer and EMI shielding analyzer. EMI shielding efficiencies of nickel electroless plated MWCNT were measured to be 16 dB from 800 MHz band, which was 1.6 times increased compared to that of the activated MWCNT. Also, the average sheet resistance of nickel electroless plated MWCNT was measured to be $70{\Omega}/sq$, which was 56% decreased compared to that of the activated MWCNT. This result could be attributed to the plating morphology on the surface of MWCNT. This result could be attributed to uniformity of plating morphology on the surface, which has more effect on EMI shielding efficiency than the amount of nickel plating.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2007.11a
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• pp.77-78
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• 2007

AZ31 마그네슘 판재의 장식 도금을 공정 개발을 적용하기 위한 기초 연구로서 전처리 특성에 따른 마그네슘 AZ31 판재의 아연치환도금의 특성을 연구하였다. AZ31 판재는 다이캐스팅으로 사용되는 AZ91 소재에 비해 산세에 대해 민감한 반응을 나타내었다. 소재의 균일화는 시편 E와 F에서 균일하고 광택 있는 표면을 얻었고, 질산은 표면 에칭효과만을 가진다는 것을 알 수 있었다. 아연치환도금을 위한 전처리에 있어서는 시편 E에서 우수한 밀착력을 나타내었다. 이후 청화동 도금과 황산동 도금, 니켈도금 3가 크롬도금을 실시하여, X-cutting 테이핑 테스트에서 양호한 밀착성과 내식성 72시간, 열탕시험을 만족하였다.

• Journal of Korean Society of Environmental Engineers
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• v.38 no.1
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• pp.1-7
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• 2016

In order to treat electrolysis nickel plating pickling wastewater to meet the effluent limit less than 3.0 mg/L, the electrolysis process by using soluble and insoluble electrode were studied. Electrolysis using soluble electrodes has a characteristic of easy elution from the electrode which the insoluble electrodes close not release metal from the electrode. For these reasons, there exist different characteristics in nickel removal efficiency, purity of nickel sludge. With this connection, the feasibility test were concluded to develop optimal conditions for the treatment of pickling wastewater electrolysis by using soluble electrodes, insoluble electrodes. Optimal condition of current density, pH were derived from the pickling wastewater using insoluble electrodes. It was concluded the highest removal efficiency of nickel at the operation condition of at pH 9, current density of $15mA/cm^2$. At these conditions, 95.3% purity of nickel sludge was achieved, iron content was 2.9%. Optimal condition when using soluble electrodes was derived current density of $10mA/cm^2$, pH 9. Purity of nickel sludge was 77.3%, iron content was 21.0%. 50.7% and 24.2% of operating cost can be saved by the use of soluble electrodes and the use of insoluble electrodes, respectively.

• Journal of the Korean Electrochemical Society
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• v.3 no.4
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• pp.196-199
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• 2000

Electroless plating is the desirable surface treatment method which is being widely used to all kinds of material such as requiring corrosion resistance, wear resistance and conductivity, especially plating of nonconductive material. Electroless nickel deposit has particular characteristics including non-magnetic property, amorphous structure, wear resistance, corrosion protection and thermal stability. In this study, electroless nickel plating was studied with an change in hardness and corrosion resistance of electroless nickel-phosphorus deposit depending on heat treatment. The highest hardness value was obtained by heat treatment at $500^{\circ}C$ Corrosion resistance of deposit, which had been heated at $300^{\circ}C$, was excellent when it was immersed in 1M $H_2SO_4$ solution for 60 hrs.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.216-218
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• 2014

자동차용 고광택 크롬 도금 박리액에는 질산과 유가금속인 구리 및 니켈이 다량 함유되어 있는 것으로 알려져 있다. 질산($HNO_3$) 및 유가금속은 고가이며 유독하므로 경제적 및 친환경적으로 반드시 회수하여 재활용하여야 한다. 본 연구에서는 도금박리액으로부터 질산과 구리, 니켈을 용매 추출법을 이용하여 분리하였다. 수상에 존재하는 질산의 농도는 0.01 ~ 1N NaOH를 이용하여 적정하여 분석하고, 금속의 농도는 ICP-MS 및 ICP-AES 등을 이용하여 분석하였다. 도금 박리액을 분석한 결과 Cu(76850mg/L), Ni(51990 mg/L)이 함유되어 있음을 알 수 있었다. 용액 내 질산의 양을 NaOH 용액을 이용하여 적정법으로 측정하였을 때, 질산의 양은 대략 1.02 M 임을 알 수 있었다. 50 % Tributylphosphate (TBP)를 이용하여 3단 추출한 유기층의 용액을 증류수를 이용하여 3회의 역추출을 하였을 때, 원액으로부터 48.1 %의 질산을 회수할 수 있음을 알 수 있었으며, 순도는 99.5% 이상이었다. 질산 회수 후 용액 내에 남은 구리와 니켈은 ISE-106로 구리를 추출하여 니켈을 분리한 후 황산을 이용해 역추출 하였다. 회수된 구리는 NaOH를 이용하여 pH를 조절하고 수산화구리 형태로 침전시킨 후 $N_2H_4$를 이용하여 환원시켰고, 온도와 pH 및 환원제를 이용하여 다양한 조건 하에 구리 분말을 제조하였다. 구리를 추출하여 라피네이트 용액으로 분리된 니켈은 $NaBH_4$를 이용하여 환원시켰고, 다양한 조건 하에서 니켈 분말을 제조하였다. 환원 된 분말은 분석결과 99%의 순수한 분말임을 알 수 있었다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.05a
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• pp.152-153
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• 2015

알루미늄 공기전지의 환원전극으로 많은 재료들이 쓰이고 있지만 그중에서도 니켈은 값이 싸며 전기 전도도가 높아 많이 쓰이고 있다. 니켈 메쉬표면에 이산화망간을 촉매로써 처리하지만 이산화망간 용액을 적시고 말리는 기존방법에서는 균일하게 처리가 되지 않고 공기가 통하지 않는 경우도 있기 때문에 보다 균일한 처리를 위해 전해도금을 연구하였다.