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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
A Study on High Temperature Particles-Erosion of Hard Coatings
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 291~295
Many steam turbine components encounter solid particle erosion damage. It has been reported that particle erosion damage is caused by oxide scale exfoliation from boiler tubes. One of the most effective solutions to combat the erosion damage is the application of erosion resistant coatings on the turbine components. In this study, particle erosion resistance for various hard coatings such as nitride, Cr carbide and boride coatings was evaluated under the simulated erosion conditions of steam turbines. Based on the particle erosion tests, the boride coating was found to be more superior to others.
Diamond-Like Carbon Films Deposited by Pulsed Magnetron Sputtering System with Rotating Cathode
Chun, Hui-Gon ; You, Yong-Zoo ; Nikolay S. Sochugov ; Sergey V. Rabotkin ;
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 296~300
Extended cylindrical magnetron sputtering system with rotating 600-mm long and 90-mm diameter graphite cathode and pulsed power supply voltage generator were developed and fabricated. Time-dependent Langmuir probe characteristics as well as carbon films thickness were measured. It was shown that ratio of ions flux to carbon atoms flux for pulsed magnetron discharge mode was equal to
sub C/ = 0.2. It did not depend on the discharge current in the range of
/ = 10∼60 A since both the plasma density and the film deposition rate were found approximately proportional to the discharge current. In spite of this fact carbon film structure was found to be strongly dependent on the discharge current. Grain size increased from 100 nm at
= 10∼20 A to 500 nm at
= 40∼60 A. To deposit fine-grained hard nanocrystalline or amorphous carbon coating current regime with
= 20 A was chosen. Pulsed negative bias voltage (
= 0∼10 ㎸) synchronized with magnetron discharge pulses was applied to a substrate and voltage of
= 3.4 ㎸ was shown to be optimum for a hard carbon film deposition. Lower voltages were not sufficient for amorphization of a growing graphite film, while higher voltages led to excessive ion bombardment and effects of recrystalization and graphitization.
A Study of Localized Corrosion Mechanisms in the Multilayered Coatings by Cathodic Arc Deposition
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 301~306
N coatings were deposited on AISI D2 steel using cathodic arc deposition (CAD) method. These coatings contain structural defects such as pores or droplets. Thus, the substrate is not completely isolated from the corrosive environment. The growth defects (pores, pinholes) in the coatings are detrimental to corrosion resistance of the coatings used in severe corrosion environments. The localized corrosion behavior of the coatings was studied in deaerated 3.5 wt.% NaCl solution using electrochemical techniques (potentiodynamic polarization test) and surface analyses (GDOES, SEM, AES, TEM). The porosity was calculated from the result of potentiodynamic polarization test of the uncoated and coated specimens. The calculated porosity is higher in the
N than others, which is closely related to the packing factor. The positive effects of greater packing factor act on inhibiting the passage of the corrosive electrolyte to the substrate and lowering the localized corrosion kinetics. From the electrochemical tests and surface analyses, the major corrosion mechanisms can be classified into two basic categories: localized corrosion and galvanic corrosion.
Evaluation of the Corrosion Resistance of Plated Ni and Ni-Cr Layers on Fe Substrate by Using Salt Spray, CASS and EC Tests
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 307~316
Salt spray, CASS(copper accelerated acetic salt spray) and EC(electrolytic corrosion) tests were performed in order to evaluate the corrosion resistance of plated Ni and Ni-Cr layers on Fe substrate. Compared with the conventional methods such as salt spray and CASS, the electrochemical method such as EC test may be beneficial in terms of test time span and quantitative accuracy. Furthermore, EC test can also become the alternative method to evaluate the resistance to corrosion of coatings by measuring the corrosion potentials of the coated layers in the electrolyte during the off-time of EC cycles. Compared with the corrosion potentials of pure iron, nickel, chromium, those potentials of coated layers can be used to anticipate the extent of corrosion. Results showed that in terms of the test time span, EC test gave 14 times and 21 times faster results than the salt spray test in cases of
Ni plated layers, respectively. In addition, EC test also offered the shorter test time span than CASS test in cases of
Cr on Fe substrate by 78 times and 182 times, respectively. Therefore, EC test can be regarded as the better method to evaluate the resistance to corrosion of coated layers than the conventional methods such as salt spray and CASS.
Effect of Additives on Deposition Rate and Stability of Electroless Black Ni-Zn-P Plating
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 317~323
The effect of additives such as complexing agents, stabilzers and boric acid on the bath stability and the deposition rate of electroless black Ni-Zn plating has been examined. The deposits obtained became black and showed an amorphous structure. The significant increasing in the deposition rate was not found when only glycine and citric acid were used as complexing agents. The deposition rate increased up to 3 and 4 times by adding malic acid and glycolic acid as an additional complexing agent, respectively. The stabilizers and the boric acid, however, had little influence on the deposition rate.
A Study on the Crevice Corrosion Behavior of Chromium Plating
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 324~328
This study was made on the crevice corrosion behavior of chromium plating in fresh water. Under the various crevice, the electrochemical polarization test of chromium plating was carried out. Results are discussed In terms of corrosion potential, polarization resistance, corrosion current density and cathodic control of chromium plating.
Effect of V on High Temperature Oxidation of TiAl Alloy
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 329~333
The high-temperature oxidation behavior of Ti39Al-10V alloy that consisted primarily of
Al phases was studied. The relatively thick and porous oxide scales formed consisted primarily of an outermost, thin TiO
layer, and an outer, thin
-rich layer, and an inner, very thick (TiO
) mixed layer. Vanadium was present uniformly throughout the oxide scale. The formation and subsequent evaporation of V-oxides such as VO,
deteriorated oxidation resistance and scale adherence of the TiAl alloy significantly.y.
Dry Etching of AlGaAs and InGaP in a Planar Inductively Coupled B
;;;;;;;S. J. Pearton;
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 334~338
Surface Characteristics of Stainless Steel Wire for Dental and Medical Use
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 339~346
Stainless steel wire has been used in industry, dental and medical parts. Especially, it has been used widely for the dental orthodontic materials. The orthodontic wire requires good mechanical properties, such as elastic strength, combined with a high resistance to corrosion. To increase elastic strength and good corrosion resistance, drawing methods(one-step and two-step drawing) have been used and the electrochemical characteristics of drawed wire have been researched using potentiodynamic method in 0.9％NaCl and field emission scanning electron microscope. The one-step drawed wire showed the formation of rough surface. The hardness and tensile strength of two-step drawed wire increased. For the case of two-step drawed wire, the corrosion resistance and pitting potential increased compared with one-step drawed wire due to the drawing induced small surface roughness, such as scratch. The passivation and active current density decreased as the reduction in area for drawing increased.
Irregular Failures at Metal/polymer Interfaces
Lee, Ho-Young ;
Journal of the Korean institute of surface engineering, volume 36, issue 4, 2003, Pages 347~355
Roughening of metal surfaces frequently enhances the adhesion strength of metals to polymers by mechanical interlocking. When a failure occurs at a roughened metal/polymer interface, the failure prone to be cohesive. In a previous work, an adhesion study on a roughened metal (oxidized copper-based leadframe)/polymer (Epoxy Molding Compound, EMC) interface was carried out, and the correlation between adhesion strength and failure path was investigated. In the present work, an attempt to interpret the failure path was made under the assumption that microvoids are formed in the EMC as well as near the roots of the CuO needles during compression-molding process. A simple adhesion model developed from the theory of fiber reinforcement of composite materials was introduced to explain the adhesion behavior of the oxidized copper-based leadframe/EMC interface and failure path. It is believed that this adhesion model can be used to explain the adhesion behavior of other similarly roughened metal/polymer interfaces.