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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 36, Issue 6 - Dec 2003
Volume 36, Issue 5 - Oct 2003
Volume 36, Issue 4 - Aug 2003
Volume 36, Issue 3 - Jun 2003
Volume 36, Issue 2 - Apr 2003
Volume 36, Issue 1 - Feb 2003
Selecting the target year
Corrosion Behavior and Crystal Structure of Zn-Cr Coatings by EB-PVD and Electroplating
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 423~429
It has been investigated corrosion resistance and crystal structure of Zn-Cr coatings fabricated by electroplating method and electron-beam physical vapor deposition method(EB-P VD). The electroplated Zn-Cr alloy consists mainly of η'-Zn phase for the lower Cr content than 7.9 wt% Cr and
'-ZnCr phase for the higher Cr content. In the Zn-Cr alloy fabricated by EB-PVD the
'-ZnCr phase appeared clearly at 3 wt% Cr and it became the sole phase at 50 wt%Cr. The amount of η'-Zn phase decreased obviously with increasing Cr content when it exceeded 15 wt% Cr. The electrochemical measurement of the electroplated Zn-Cr film has shown corrosion potential of about -1000 mV. The current density of active region and the amount of dissolved Zn and Cr decreased significantly with increasing Cr content. The electrochemical characteristics of Zn-Cr alloy fabricated by EB-PVD have shown that the alloy of 50 wt% Cr had the highest corrosion potential(-500 mV) and the lowest critical passive current density than that of the electroplated.
High Temperature Oxidation Behavior of Ni-W Coatings Electrodeposited on Steel
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 430~436
The nanoocrystalline Ni-l5W(at.%) coating electrodeposited on the high carbon steel was oxidized at 700 and
in air, and the resultant oxidation properties were investigated using XRD, EPMA, TGA and TEM. The oxidation resistance of the coating was not so good that most of the coating was oxidized after oxidation at
for 5 hrs. The oxidation led to the formation of the outer, thin NiO oxide scale and the inner, porous, rather thick (
＋NiO) mixed layer containing a bit of
. During oxidation, substrate elements such as Fe and Cr diffused outwardly toward the coating, according to the concentration gradient.
The Effect of Grain Refiner on Ni-Fe-P Alloy Electrodeposition
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 437~443
The effects of additive(grain refiner, GR) on process efficiency of the Ni-Fe-P alloy electrodeposition and the material properties of the deposit were investigated. Electrochemical properties of the deposits were investigated using polarization and electrochemical impedance techniques, and the material properties of the deposits were characterized through inductively coupled plasma(ICP), spiral contractometer, XRD, SEM and TEM. When the additive was added into the electrodeposition bath, current efficiency, Ni content and corrosion resistance of the deposit increased, whereas residual stress, surface roughness and grain size of the deposit decreased.
Effect of Trace Metallic Additives of Al-Fe-X on Microstructure and Properties of Zn Electrodeposits
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 444~454
The effect of trace metallic additives of Al-Fe-X on microstructure, glossiness and hardness of Zn electrodeposits was investigated by using sulfate bath. The preferred orientation of Zn deposits with Al-Fe additives was (10 l)(l:3,4,2), while that of Zn deposits with Al-Fe-X(Ni,Co) additives was either (002) or (002)＋(103)ㆍ(104) mixed orientation. The preferred orientation of Zn deposits with Al-Fe-Cr additives changed from (002)+(10 l) to (10 l) orientation with increasing amount of Al additive. The surface morphology of the Zn deposits was closely related to the preferred orientation of the deposits. The glossiness of Zn deposits with Al-Fe additives increased in comparison with that of pure Zn deposit. That of the Zn deposits with Al-Fe-X additives was related to the morphology of the deposits and changed according to type of additives. The hardness of Zn deposits with Al-Fe-X(Ni,Co,Cr) additives was noticeably higher than that of Zn deposits with Al-Fe additives.
Microstructure and Mgnetic Properties of Electrodeposited Nanocrystalline Low-Nickel Permalloy
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 455~460
Microstructural and magnetic properties of nanocrystalline Fe-46 wt%Ni and Fe-36 wt%Ni alloys were investigated. Alloys were prepared by the electrodeposition process. The electrolytes were iron sulfate/nickel chloride-based and iron chloride/nickel sulfamate-based solutions. Fe-46 wt%Ni alloy was FCC structure with grain size of 10 nm, but FCC and BCC phases were found in Fe-36 wt%Ni alloy and its grain size was smaller. Effective permeability of Fe-36 wt%Ni alloy was higher than that of Fe-46 wt%Ni alloy in the high frequency range because of large electrical resistivity and small eddy current loss resulted from grain size decrease. Up to
of annealing temperature, grain growth of Fe-Ni alloys slowly occured. Conversely, annealing above
led to a drastic grain growth. In that case, effective permeability was decreased at the temperature lower than
or higher effective permeability was increased. At the high frequency of 1 MHz, electrodeposited Fe-Ni alloys had higher effective permeability with an decrease in the grain size.
A Study of Structures and Magnetic Properties of Electrodeposited Fe-45 wt％Ni-P Alloys
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 461~465
The microstructures and magnetic properties of electrodeposited Fe-45 wt%Ni-P alloys have been investigated. The structures of electrodeposited Fe-45 wt%Ni alloy was FCC i.e.
phase and the size of crystallite was 10 nm. The structure of electrodeposited Fe-45 wt%Ni-1 wt%P alloy showed
phase and 7 nm sized nanocrystalline. The electrodeposited Fe-45 wt%Ni-P alloys containing 2∼3 wt% of P exhibited
dual phases. The electrodeposited Fe-45 wt%Ni-P alloys above 3.5 wt% showed an amorphous structure. P in the alloys acted grain refining and phase changing element. The resistivity of the electrodeposited alloys increased with P contents. Effective permeability at high frequency (above 1 MHz) increased with P contents up to 2 wt% and this was ascribed to the easier magnetization rotation owing to the reduction of eddy current. Effective permeability decreased with P contents above 3 wt% and this was ascribed to the transformation of the ferromagnetism of Fe-45 wt%Ni alloy gradually into paramagnetism with the introduction of P into the electrodeposited alloy matrix.
A Study on Detecting Dross in Coating Layer on Hot-dip Galvanizing Steels
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 466~474
To develop a method of detecting dross in coating layer on hot-dip galvanizing steel, chemical etching behavior of the artificial coating layers with top and bottom dross were investigated. After chemical etching with the mixture of picric acid and sodium thiosulfate, each of the top and bottom dross take its distinct color, and alloy layer in coating is also observed. Defects in the coating layers of HGI(hot rolled galvanized iron), CGI(continuous galvanized steel sheet) and GA(galvannealed steel) were analysed, and methods of dross detection which can be applied to inspection process in manufacture were suggested.
The Improvement of Fatigue Properties by 2-step Shot Peening
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 475~479
In this study, to investigate the effects of 2-step shot peening at the surface of spring steel, tests are conducted on spring steel and shot peened specimens. Various tests are accomplished to evaluate mechanical properties influenced by shot peening process, and fatigue tests are also performed to evaluate the improvement of fatigue strength. And then the residual stresses are examined. The mechanical properties of material did not change so much by shot peening. However, the fatigue strength of notched specimen remarkably increased. In the case of 1-step shot peening, fatigue strength increased by about 20％ than unpeened specimen. Especially, in the case of 2-step shot peening, fatigue strength increased by about 40％, because the residual compressive stress at surface was higher than that of 1-step shot peened specimen. The fatigue strength and life are closely related to the value and position of maximum compressive residual stress by shot peening.
Effects of Plasma-Nitriding on the Pitting Corrosion of Fe-30at％Al-5at％Cr Alloy
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 480~490
Effects of plasma-nitriding on the pitting corrosion of Fe-30at%Al-5at%Cr alloy containing Ti, Hf, and Zr were investigated using potentiostat in 0.1M HCl. The specimen was casted by the vacuum arc melting. The subsequent homogenization was carried out in Ar gas atmosphere at
for 7days and phase stabilizing heat treatment was carried out in Ar gas atmosphere at
for 5 days. The specimen was nitrided in the
, (1:1) mixed gas of
for 10 hrs. After the corrosion tests, the surface of the tested specimens were observed by the optical microscopy and scanning electron microscopy(SEM). For Fe-30at%Al-5Cr alloy, the addition of Hf has equi-axied structure and addition of Zr showed dendritic structure. For Fe-30at%Al-5Cr alloy containing Ti, plasma nitriding proved beneficial to decrease the pitting corrosion attack by increasing pitting potential due to formation of TiN film. Addition of Hf and Zr resulted in a higher activation current density and also a lower pitting potential. These results indicated the role of dendritic structure in decreasing the pitting corrosion resistance of Fe-30Al-5Cr alloy. Ti addition to Fe-30Al-5Cr decreased the number and size of pits. In the case of Zr and Hf addition, the pits nucleated remarkably at dendritic branches.
Failure Path of the Brown-oxide-coated Copper-based Leadframe/EMC Interface under Mixed-Mode Loading
Journal of the Korean institute of surface engineering, volume 36, issue 6, 2003, Pages 491~499
Copper-based leadframe sheets were oxidized in a hot alkaline solution to form brown-oxide layer on the surface and molded with epoxy molding compound (EMC). The brown-oxide-coated leadframe/EMC joints were machined to form sandwiched double-cantilever beam (SDCB) specimens and sandwiched Brazil-nut (SBN) specimens for the purpose of measuring the fracture toughness of leadframe/EMC interfaces. The SDCB and the SBN specimens were designed to measure the fracture toughness of the leadframe/EMC interfaces under nearly mode-I loading and mixed-mode (mode I ＋ mode II) loading conditions, respectively. Fracture surfaces were analyzed by various equipment such as glancing-angle XRD, SEM, AES, EDS and AFM to elucidate failure path. Results showed that failure occurred irregularly in the SDCB specimens, and oxidation time of 2 minutes divided the types of irregular failures into two classes. The failure in the SBN specimens was quite different from that in the SDCB specimens. The failure path in the SBN specimens was not dependent on the phase angle as well as the distance from tips of pre-cracks.