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MinYoung Shon 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Cavitation erosion tests were conducted to evaluate the cavitation erosion resistance of five coating materials: epoxy clear coat, commercial epoxy coating, glass-flake-reinforced epoxy coating, polyurethane coating, and silicone coating. The relationships between cavitation erosion resistance and the mechanical and thermal properties were studied. Eroded surfaces were observed using scanning electron microscopy and 3D confocal microscopy. We found that the cavitation erosion resistance was greater in coating materials with better ductile and tough properties than in coating materials with higher strength or hardness. Thermal stability was also a very important factor that determined cavitation erosion resistance.
( Jiman Jang ),( Minyoung Shon ),( Samtak Kwak ) 한국부식방식학회 2016 Corrosion Science and Technology Vol.15 No.1
Zinc ethyl silicate coatings containing multi walled carbon nanotubes (MWCNTs) were prepared, to which we added spherical and flake shaped zinc particles. The anti-corrosive effects of MWCNTs and zinc shapes on the zinc ethyl silicate coated carbon steel was examined, using electrochemical impedance spectroscopy and corrosion potential measurement. The results of EIS and corrosion potential measurement showed that the zinc ethyl silicate coated with flake shaped zinc particles and MWCNT showed lesser protection to corrosion. These outcomes were in agreement with previous results of corrosion potential and corrosion occurrence.
( Pyonghwa Shin ),( Duhwan Jo ),( Minyoung Shon ) 한국부식방식학회 2016 Corrosion Science and Technology Vol.15 No.2
In the present study, polyester-melamine coating systems with natural wood fiber (NWF) were prepared and the effects of NWF on the corrosion protectiveness of the polyester-melamine coating were examined using EIS analysis. From the results, higher average surface roughness was observed with increase of NWF content. Water diffusivity and water uptake into the polyester-melamine coatings with NWF were much higher than that into the pure polyester-melamine coating. The decrease in the impedance modulus |Z| was associated with the localized corrosion on carbon steel, confirming that corrosion protection of the polyester-melamine coatings with NWF well agrees with its water transport behavior.
SeKwon Oh,YoungJun Kim,MinYoung Shon,권혁상 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
In present study, we quantitatively define the galvanic corrosion phenomenon of Cu electrically coupled to Au on Print Circuit Board in Organic Solderability Preservatives (OSP) pretreatment (pickling and soft etching) solutions. As a result of polarization and ZRA test, galvanic corrosion rate of Cu in soft etching solution was about 3000 times higher than that of pickling solution. The oxone in OSP soft etching solution was acted as strong oxidant for Cu on PCB substrate. And the galvanic corrosion of Cu in OSP soft etching solution was examined with the change of etchants (oxone (KHSO5), sulfuric acid (H2SO4)) concentration. The galvanic corrosion rate of Cu was increased by the increase of the oxone and sulfuric acid concentrations, which lead to the increase of cathodic reactant such as HSO5 − and H+ ions. And the degree of galvanic corrosion rate of Cu (Δisoft etching = icouple, (Cu-Au) - icorr, Cu) decreased with the decrease of the oxone and sulfuric acid concentrations.
Shivshankar Chaudhari,YongSung Kwon,MinYoung Shon,SeungEun Nam,You-In Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Conventional distillation failed to separate a ternary azeotropic mixture of ECH, IPA and water (50/30/20 w/w, %) exist in the epoxy resin manufacturing process. Thus, we prepared a PVA-tetraethylorthosilicate organic–inorganic hybrid membrane and modified the membrane by layer-by-layerdeposition of a PVAm/silicotungstic acid polyelectrolyte for the pervaporation (PV) dehydration of ECH/IPA/water mixtures. In PV experiments at 30 C, theflux decreased from 0.14 to 0.05 kg m 2 h 1 andseparation factor increased from and 2099 to 13,320 with TEOS addition in the PVA membrane wasobserved. And for the layer by layer deposition on PVA-TEOS (4) membranesflux increased andseparation factor decreased from 0.14 to 0.28 kg m 2 h 1 and 2099 to 416 with the number of layer ofdeposition were observed respectively. On varying the feed water content from 20 to 10 wt. %, thepervaporationflux at 30 C decreased from 0.22 to 0.0066 kg m 2 h 1 and the separation factor increasedfrom 1061 to 9094 was observed. By applying the Arrhenius equation, permeation activation energies ofECH and IPA (97.42 and 111.96 kJ mol-1, respectively) are higher than that of water (40.88 kJ mol 1) werereported for the layer by layer membrane.
( Jae Hong Jeon ),( Minyoung Shon ) 한국부식방식학회 2014 Corrosion Science and Technology Vol.13 No.5
Polyurethane coating was designed to give a hydrophobic property on its surface by modifying it with hydroxyl terminated polydimethylsiloxane and then effects of surface hydrophobic tendency, water transport behavior and hence corrosion protectiveness of the modified polyurethane coating were examined using FT-IR/ATR spectroscopy, contact angle measurement and electrochemical impedance test. As results, the surface of polyurethane coating was changed from hydrophilic to hydrophobic property due primarily to a phase separation tendency between polyurethane and modifier by the modification. The phase separation tendency is more appreciable when modified by polydimethylsiloxane with higher content. Water transport behavior of the modified polyurethane coating decreased more in that with higher hydrophobic surface property. The decrease in the impedance modulus |Z| at low frequency region in immersion test for polyurethane coatings was associated with the water transport behavior and surface hydrophobic properties of modified polyurethane coatings. The corrosion protectiveness of the modified polyurethane coated carbon steel generally increased with an increase in the modifier content, confirming that corrosion protectiveness of the modified polyurethane coating is well agreed with its water transport behavior.
다양한 발열체가 분산된 폴리우레탄 접착 필름의 유도가열 거동 비교
권용성 ( Yongsung Kwon ),배덕환 ( Duckhwan Bae ),손민영 ( Minyoung Shon ) 한국복합재료학회 2017 Composites research Vol.30 No.3
나노 및 마이크로 크기의 철(Fe), 마그네타이트(Fe<sub>3</sub>O<sub>4</sub>) 및 니켈(Ni) 입자가 분산된 열가소성 폴리우레탄(TPU) 접착필름에서 각 금속의 크기 및 형상 그리고 피착재의 종류에 따른 접착필름의 유도가열 거동을 연구하였다. 연구결과 동일한 첨가량 및 유사한 입자 크기에서 철과 니켈이 분산된 열가소성 TPU 접착필름에 비해 마그네타이트가 분산된 TPU 접착필름의 발열이 높게 나타났다. 철과 니켈의 입자 크기가 자기장의 표면 침투 깊이(Penetration skin depth) 보다 클 경우 와전류에 의한 발열로 인해 입자 크기가 커질수록 초기 승온속도와 최고 온도가 증가하는 것을 확인하였다. 서로 다른 형태를 갖는 니켈 입자를 사용한 유도가열 실험 결과 편상(flake)의 입자가 TPU 접착필름에 분산되었을 때 자기이력(Magnetic hysteresis)에 의한 열 발생으로 가장 높은 발열이 나타남을 알 수 있었다. 또한 금속 입자가 분산된 TPU 접착필름이 서로 다른 피착재에 적용되었을 때 발열현상이 상이하게 나타났으며 피착재의 열전도도에 따른 결과를 확인하였다. The effect of nanoscopic and microscopic Fe, Fe<sub>3</sub>O<sub>4</sub>, and Ni particles and their shapes and substrate materials on the heating behavior of thermoplastic polyurethane (TPU) adhesive films was investigated via induction heating. The heat generation tendency of Fe<sub>3</sub>O<sub>4</sub> particles was higher than that shown by Fe and Ni particles in the TPU adhesive films. When the Fe and Ni particle size was larger than the penetration skin depth, the initial heating rate and maximum temperature increased with an increase in the particle size. This is attributed to the eddy current heat loss. The heating behavior of the TPU films with Ni particles of different shapes was examined, and different hysteresis heat losses were observed depending on the particle shape. Consequently, the flake-shaped Ni particles showed the most favorable heat generation because of the largest hysteresis loss. The substrate materials also affected the heating behavior of the TPU adhesive films in an induction heating system, and the thermal conductivity of the substrate materials was determined to be the main factor affecting the heating behavior.