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- 저자 : 이훈성(Hoon-Seung Lee) (검색결과 5 건)
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건습식 혼합공정을 이용한 유연소재 상 전자파 차폐용 다층막 코팅
이훈성(Hoon-Seung Lee),이명훈(Myeong-Hoon Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
Dry processes like evaporation and sputtering in vacuum chamber are difficult to make a uniform, large area and high quality film on thin PET substrate because of PET degradation and bad adhesion. On the other hand, wet processes like electro or electroless plating have complex processes and require high environmental cost. In this study, we successfully prepared 2 μm Zn/Cu/Ni multilayers coated on 12 μm polyethylene terephthalate (PET) substrate by using dry-wet mixing processes. Their surface electric resistances were evaluated around 0.2 Ω by using 4 probe measurements. Furthermore, their corrosion resistance also evaluated by natural potential test and compared with other wet, dry and mixing process samples.
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PEO 전류밀도 조건에 따른 알루미늄도금 강재상 산화코팅막의 특성
최인혜(In-Hye Choi),이훈성(Hoon-Seung Lee),이명훈(Myeong-Hoon Lee) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.5
Plasma electrolytic oxidation(PEO) has attracted attention as a surface treatment which has high wear resistance and corrosion resistance. PEO is generally considered as cost-effective, environmentally friendly and superior in terms of coating performance. Most of studies about the PEO processes have been applied to light metals such as Al and Mg. Because the strength of Al and Mg is weaker than that of steel, there is a limit to the application. In this study, PEO process was used to form oxide coatings on Hot dipped aluminized(HDA) steel and the characteristics of the coating film according to the PEO current density were studied. The morphology was observed by SEM and component was analyzed by using EDS. The corrosion behaviors of PEO coating films were estimated by exposing salt spray test at 5 wt.% NaCl solution and measuring polarization curves in deaerated 3 wt.% NaCl solution. With the increase of PEO process current density, the pore size of the coating surface and the thickness of coating increased. It was confirmed that no Fe component was present on the coating surface. PEO coating films obviously showed good corrosion resistance compared with HDA. It is considered that the PEO coating acts as a barrier to protect the base material from external factors causing corrosion.
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