• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2005년도 춘계학술대회 논문집
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• pp.401-406
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• 2005

In this paper, both effect of TiN-coating and effect of temperature in TiN-coating by arc ion plating on surface characteristics of TiN coated SKH51 steel are investigated by experiments. Hardness, surface roughness, TiN coating thickness and adsorption force are measured in order to evaluate the effects. For evaluation of the experimental data, the two-way ANOVA method is used. It is concluded that the furnace temperature in the rang of $400^{\circ}C\~500^{\circ}C$ in AIP processing has very little influence on the TiN coating of the SKH51 steels.

• 열처리공학회지
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• 제34권6호
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• pp.281-286
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• 2021

Arc ion plating (AIP), laser cladding, and nitriding are methods that can prevent mold damage or repair and create cracks and breakages on the die surface. The dissolution and soldering behavior of coated SKD61 by using arc ion plating, laser cladding, and nitriding was investigated. The structure of the coating was investigated as a function of deposition conditions by X-ray diffraction and the crystallographic orientation was determined using the texture factor. The TiAlN film deposited with AIP showed excellent corrosion resistance in the molten aluminum alloy at 680℃. In this paper, we have detailed the corrosion and mass loss phenomena associated with these steel-cast metal interactions.

• Corrosion Science and Technology
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• 제21권2호
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• pp.89-99
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• 2022

A versatile method for performing non-cyanide electroless gold plating using thiomalic acid (TMA) as a complexing agent and 2-aminoethanethiol (AET) as a reducing agent was investigated. It was found that TMA was an excellent complexing agent for gold. It can be used in electroless gold plating baths at a neutral pH with a high solution stability, makes it a potential candidate to replace conventional toxic cyanide complex. It was found that one gold atomic ion could bind to two TMA molecules to form the [2TMA-Au⁺] complex in a solution. AET can be used as a reducing agent in electroless gold plating solutions. The highest current density was obtained at electrode rotation rate of 250 to 500 rpm based on anodic and cathodic polarization curves with the mixed potential theory. Increasing AET concentration, pH, and temperature significantly increased the anodic polarization current density and shifted the plating potential toward a more negative value. The optimal gold ion concentration to obtain the highest current density was 0.01 M. The cathodic current was higher at a lower pH and a higher temperature. The current density was inversely proportional to TMA concentration.

• 한국해양공학회지
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• 제11권4호
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• pp.49-60
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• 1997

This paper deals with the effect of coating layer on the fatigue strength of TiN coated 1Cr-1Mo-0.25V steel prepared by using the arc ion plating (AIP) process, in which it was characterized by the presence of extractor grid (ion filter). The rotary bending fatigue tests were carried out under room air conditions, and the fatigue crack initiation and growth bwhavior were observed by using plastic replica method. As experimental results, it was found that the obvious improvement of fatigue life at lower stress region was confirmed in TiN coated specimen processed with ion filter. It was also exlained that the increase of fatigue life in the case of an improved AIP process with ion filter was attributed to the retardation of crack initiation of the substrate surface due to hard coating layer, more densly formed with the reduced size and density of droplets.

• 한국표면공학회지
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• 제55권2호
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• pp.120-132
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• 2022

In the non-cyanide-based electroless Au plating solution using thiomalic acid as a complexing agent and aminoethanethiol as a reducing agent, analysis of each component constituting the plating solution is essential for the analysis of the reaction mechanism. And component analysis in the plating solution is important for monitoring component changes in the plating process and optimizing the management method. Capillary Electrophoresis (CE) method is rapid, sensitive and quantitative and could be readily applied to analysis of Auⁿ⁺ ion, complexing agent and reducing agent in electroless Au plating solution. In this study, the capillary electrophoresis method was used to analyze each component in the electroless Au plating solution in order to elucidate the complex bonding form and the plating mechanism of the non-cyanide-based electroless Au plating bath. The purpose of this study was to establish data for optimizing the monitoring and management method of plating solution components to improve the uniformity of precipitation and stability. As a result, it was confirmed that the analysis of thiomalic acid as a complexing agent and Auⁿ⁺ ions and the analysis of aminoethanethiol as a reducing agent were possible by capillary electrophoresis. In the newly developed non-cyanide-based electroless Au plating solution, it was confirmed that Auⁿ⁺ ions exist in the form of Au⁺ having a charge of +1, and that thiomalic acid and Au⁺ are combined in a molar ratio of 2 : 1. In addition, it was confirmed that aminoethanethiol can form a complex by combining with Au⁺ ions depending on conditions as well as acting as a reducing agent.

• 자원리싸이클링
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• 제25권4호
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• pp.42-48
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• 2016

주석도금폐액으로부터 고순도 주석 금속을 회수하는 연구를 실시하였다. 먼저 주석도금폐액을 Iminodiacetic 관능기를 가진 이온교환수지(Lewatit TP 207)를 사용하여 1차적으로 유기물 및 Fe, Zn, Na 등의 불순물을 제거하였고, 2차적으로 Ethylhexyl-phosphate의 관능기를 가진 이온교환수지(Lewatit VPOC 1026)를 사용하여 잔류하고 있는 불순물들을 모두 제거하여 고순도의 주석용액으로 회수하였다. 회수된 주석용액으로부터 고순도 금속주석으로 회수하기 위하여 사이클론식 전해방법을 사용하였으며, 전해채취 결과 약 99.98% 순도의 주석을 회수할 수 있었다.

• 한국표면공학회지
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• 제29권5호
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• pp.545-548
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• 1996

$CrN_x$ films were deposited on SKD61 and S45C by cathodic arc ion plating process. In this study, the microstructure, microhardness, a hesion, wear and corrosion properties of the CrNx films were studied for various nitrogen partial pressures and the results were compared with those from the electroplated hard Cr. The crystal structure of the films was characterized by X-ray diffraction. Wear tests were performed under no lubricant condition at atmosphere by ball-on-disc type tribotester. Corrosion resistance of the films were studied by electrochemical corrosion test, measuring current demsity-potential curves. The results indicated that the $CrN_x$ films formed using ion plation method showed higer hardness and lower current density, friction coefficient than electroplated hard Cr. Consequently, the application of the CrNx coationgs by ion plating which is free of environmental pollution, is expected to improve lifetime of components in industrial practice.

• Bulletin of the Korean Chemical Society
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• 제16권3호
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• pp.221-226
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• 1995

A method for determining nitrate in post treatment chromium plating solutions with PVC-based nitrate-selective electrodes is described. PVC-based nitrate-selective membranes which contain TDMANO3 ion-exchanger in PVC/NPOE, PVC/DOA or PVC/DBP matrices, and a commercially available Corning electrode (No. 476134) have been compared in respect of their detection limits, response slopes, selectivities at various pHs, and dynamic response to the hydrochromate ion in basic condition. The PVC/DBP/TDMANO3 membrane electrode was chosen as the ISE detector for the determination of nitrate in the presence of hydrochromate interference. The amount of nitrate in real post treatment chromium plating solution could be determined successfully with this electrode in both static and flow-injection measurements when the sample was properly diluted with an alkaline buffer.

• Corrosion Science and Technology
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• 제10권2호
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• pp.65-70
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• 2011

DLC is considered as the candidate material for application of moving parts in automotive components relatively in high pressure and temperature operating conditions for its high hardness with self lubrication and chemical inertness. The properties of interlayer between the substrate and the DLC film were studied. Arc ion plating method have been employed to deposit onto substrate and sputtering method was used for synthesizing DLC onto interlayer. Among these six types of interlayer, deposited DLC film onto TiCN showed excellent value for characteristics. From the results of analysis for physical properties of DLC films, it seems that the adhesion forces were more important factors than intrinsic mechanical properties such as hardness, roughness and wear resistance of DLC films. AFM(Atomic Force Microscope) was used for understanding roughness of DLC films. Hardnesses of the coating layers were identified by nano-indentation method and adhesions were checked by scratch method.

• 자원리싸이클링
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• 제24권3호
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• pp.51-58
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• 2015

주석도금폐액으로부터 이온교환수지를 사용하여 주석 회수에 대한 연구를 실시하였다. 3종류의 이온교환수지를 사용하여 기초 실험한 결과 tertiary 기능기를 가진 이온교환수지(Lewatit TP 272)는 주석을 흡착하지 못하였고, iminodiacetic기능기를 가진 이온교환수지(Lewatit TP 207)는 주석의 흡착율은 높으나, 회수된 주석용액 내 불순물 함량이 높았다. Ethylhexyl-phosphate의 기능기를 가진 이온교환수지(Lewatit VP OC1026)를 사용한 경우, 주석의 흡착율이 iminodiacetic기능기를 가진 이온교환수지 보다 낮았으나 pH 조절에 따라 회수된 주석용액 내 불순물의 제거가 가능하였다. 또한 이온교환수지에 흡착된 유기물의 경우는 수세를 통해 제거를 함으로써 고순도 주석용액으로 회수가 가능하였다.