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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean institute of surface engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Surface Engineering
Editor in Chief :
Volume & Issues
Volume 44, Issue 6 - Dec 2011
Volume 44, Issue 5 - Oct 2011
Volume 44, Issue 4 - Aug 2011
Volume 44, Issue 3 - Jun 2011
Volume 44, Issue 2 - Apr 2011
Volume 44, Issue 1 - Feb 2011
Selecting the target year
Electrolysis for NiW Functional Alloy Plating
Jeong, Goo-Jin ; Lee, Churl-Kyoung ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 1~6
DOI : 10.5695/JKISE.2011.44.1.001
A NiW functional alloy plating was investigated as variables of metal ion concentration, complexing agent, temperature, pH and applied current density. Even if numerous studies on reaction mechanism of NiW induced codeposition were carried out during couples of decade, it has not been acceptable reaction mechanism. This study was focused on the effect of the plating variables on the alloy composition in the NiW alloy plating. Applied current density could control mainly the alloy composition rather than other plating variables. It has also been confirmed that the functional alloy plating such as layered or gradient plating was possible by controlling applied current density.
The Effect of Polyethylene Glycol on the Trivalent Chromium Electroplating
Lee, Joo-Yul ; Phuong, Nguyen Van ; Lim, Sung-Hwan ; Han, Seung-Zeon ; Kwon, Sik-Chol ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 7~12
DOI : 10.5695/JKISE.2011.44.1.007
The effect of organic additives, polyethylene glycol (PEG), on the trivalent chromium electroplating was analysed in the view point of current efficiency, solution stability and metallurgical structure. It was measured that PEG-containing trivalent chromium solution had about 10% higher current efficiency than pure solution and controlled the micro-crack density of electrodeposits. PEG exhibited profound effect on the solution stability by reducing the consumption rate of formic acid which acts as a complexant to lower the activation energy required for electrochemical reduction of trivalent chromium ions. It was also revealed that the formation of chromium carbide layer was facilitated in the presence of polyethylene glycol, which meant easier electrochemical codeposition of chromium and carbon, not single chromium deposition. Trivalent chromium layer formed from PEG-containing solution was amorphous with local nano-crystalline particles, which were prominently developed on the entire surface after non-oxidative heat treatment.
High-Temperature Oxidation Behavior of Fe-22%Cr-5.8%Al Alloy
Kim, Song-Yi ; Choi, Sung-Hwan ; Yun, Jung-Yeul ; Kong, Young-Min ; Kim, Byoung-Kee ; Lee, Kee-Ahn ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 13~20
DOI : 10.5695/JKISE.2011.44.1.013
This study investigated the high temperature oxidation behavior of Fe-22%Cr-5.8%Al alloy and the oxidation kinetics of the alloy were discussed. Bulk samples were prepared by VAM (vacuum arc melting) and hot forging. High temperature oxidation testes were isothermally conducted up to 100 hours in 79%
environment at three different temperatures (
). The weight gain was measured after oxidation according to oxidation time (2, 4, 6, 8, 10, 15, 20, 25, 30, 60, 80, 100 hours). The weight gain significantly increased with increasing oxidation temperature. As the temperature increased, the oxidized samples showed sequential formation of
, Cr-rich oxide, Fe-rich oxide. The activation energy of high temperature oxidation was obtained as 306.63 KJ/mol.
were developed on the surface in the early stage of oxidation, representing protective role of oxidation. However, Fe-based and Cr-based oxides leaded to breakaway of oxide layer, thus resulted in the significant increase of additional oxidation.
The Joining Quality of High Strength Bolt, Nut and Washer Set (A490) in the Extreme Conditions
Suk, Han-Gil ; Cho, In-Seup ; Hong, Hyeon-Sun ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 21~25
DOI : 10.5695/JKISE.2011.44.1.021
This test focuses on the correlation between the lubrication, ductility and strength through the change of nut lubricant which decides joining angle for A490 bolt sets required in the AASHTO (American Association of State Highway & Transportation Officials). Because the lubrication of high tension bolt, nut, washer sets becomes an important factor to ductility and joining load, the quality improvement is required for improving reliability and securing enough lubrication of maker and user. This study examines the quality characteristics required in the specification through tests because only this standard specifies joining quality in the extreme conditions (as much about two times of the joining angle on site as normal condition). Moreover, this study is limited to the test on joining axial force required in the AASHTO for the three nut lubrication conditions of A490 bolt set. It is concluded that the nuts should be coated or waxed enough for the improvement of the joining axial force and ductility of bolts required in the standards. It is shown that in the case of plain high tension bolt sets, a rust preventing lubricative oil shall be applied and the torque coefficient value for A490 bolt sets should be maintained below 0.175.
Numerical Modeling of Perturbation Effects of Electrostatic Probe into 2D ICP(inductively coupled plasma)
Joo, Jung-Hoon ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 26~31
DOI : 10.5695/JKISE.2011.44.1.026
Numerical modeling is used to investigate the perturbation of a single Langmuir probe (0.2 mm diameter shielded with 6 mm insulator) inserted along the center axis of a cylindrical inductively coupled plasma chamber filled with Ar at 10 mTorr and driven by 13 MHz. The probe was driven by a sine wave. When the probe tip is close to a substrate by 24.5 mm, the probe characteristics was unperturbed. At 10 mm above the substrate, the time averaged electric potential distribution around the tip was severly distorted making a normal probe analysis impossible.
Surface Treatment Effect on the Toilet by Numerical Modeling and High Speed CCD Camera
Roh, Ji-Hyun ; Do, Woo-Ri ; Yang, Won-Kyun ; Joo, Jung-Hoon ;
Journal of the Korean institute of surface engineering, volume 44, issue 1, 2011, Pages 32~37
DOI : 10.5695/JKISE.2011.44.1.032
Numerical analysis is done to investigate the effect of surface treatment of a toilet on the cleanness. The surface treatment using plasma for the super-hydrophobic surface expects the self-cleaning effect of the toilet seat cover for preventing the droplets with a great quantity of bacteria during the toilet flushing after evacuation. In this study, the fluid analysis in the toilet during the flushing was performed by an ultrahigh-speed CCD camera with 1,000 frame/sec and the numerical modeling. And the spattering phenomenon from the toilet surface during urine was analyzed quantitatively by CFD-ACE+ with a free surface model and a mixed model of two fluids. If the surface tension of the toilet surface is weak, many urine droplets after collision bounded in spite of considering the gravity. The turbulence generated by the change of angle and velocity of urine and the variation of the collision phenomenon from toilet surface were modeled numerically.