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함정용 패키지 에어콘 응축기 핀튜브(Cu-Ni 70/30) 누설파괴 원인 분석
박형훈(Hyoung Hun Park),황양진(Yang Jin Hwang),이규환(Kyu Hwan Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
In 2015, a fin tube (Cu-Ni 70/30 alloy) of package type heat exchanger for navy vessel was perforated through the wall which led to refrigerant leakage. This failure occurred after only one year since its installation. In this study, cause of the failure was determined based on available documents, metallographic studies and computational fluid dynamics simulation conducted on this fin tube. The results showed that dimensional gap between inserted plastic tube and inside wall of fin tube is the cause of the swirling turbulent stream of sea water. As a result of combination of swirling turbulence and continuing collision of hard solid particles in sea water, erosion corrosion has begun at the end of inserted plastic tube area. Crevice corrosion followed later in the crevice between the outer wall of plastic tube and inner wall of fin tube. It was found that other remaining tubes also showed the same corrosion phenomena. Thorough inspection and prompt replacement will have to be accomplished for the fin tubes of the same model heat exchanger.
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다단연소사이클 엔진 적용을 위한 Ni-Cr 코팅에 관한 연구
배병현(Byung-Hyun Bae),황양진(Yang-Jin Hwang),이규환(Kyu-Hwan Lee),이병호(Byong-ho Rhee),한영민(Yeoung-Min Han),김영준(Young-June Kim),노용오(Yong-Oh Noh),조황래(Hwang-Rae Cho),현성윤(Seong-Yoon Hyun),방정석(Jeong-Suk Bang) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 논문은 다단연소사이클 엔진의 연소실 내벽을 고온, 고압의 환경으로부터 보호하기 위한 열차폐 코팅 공정 개발에 관한 내용이다. 기존 연소기 내벽에는 열차폐 특성이 우수한 Zr 기반의 세라믹용사코팅을 적용했지만, 세라믹의 특성상 연소실 내벽(금속)과 열팽창계수 차이로 인해 박리가 발생할 수 있다. 때문에 로켓 선진국에서는 열차폐 효과를 다소 희생 하더라도 밀착력 향상을 위하여 금속계 코팅인 Ni-Cr 도금을 적용하고 있다. 본 연구에서는 연소기에 적용 가능한 상향 순환식 유동셀을 적용한 도금조를 개발했으며, 반복적인 공정 개선을 통해 도금 두께 100㎛이상, ±10%의 두께 균일도를 만족하는 Ni, Cr 도금 공정조건을 확립했다. In this paper, the process of electro Ni and electro Cr plating is studied for the purpose of thermal barrier to protect the inner wall combustion chamber. The chamber is under the environment of very high temperature and high pressure when propellants burn in there. As one of the thermal barrier coatings, Zr-based thermal spray coating has been applied to the chamber. However, peeling of coating layer can occur under such a hard condition because of the difference of thermal expansion coefficients between the ceramic and the metallic wall. We study the characteristics of Ni-Cr coating and establish its process. It is found that the thickness of over 100 ㎛ of Ni and Cr coating layers with the uniformity of ±10% can be obtained with the used of as-developed plating bath.
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이주열(Joo-Yul Lee),임성봉(Seong-Bong Yim),황양진(Yang Jin Hwang),이규환(Kyu Hwan Lee) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.6
The effect of organic additives, thiourea (TU), on the copper electroplated layer of large rectangular size was investigated through physical and various electrochemical techniques. It was found that TU had strong adsorption characteristics on the Ni substrate and affected the initial electroplating process by inducing surface reaction instead of mass transfer in the bulk solution. TU additives had its critical micelle concentration at 200 ppm in copper sulphate solution and showed abrupt change in morphological and electrochemical impedance spectroscopic results around this concentration, which could be related with the destruction of adsorption structure of TU-Cu(I) complex formed at the Ni substrate surface. By conducting a commercial electroplating simulation, when TU additives was included at cmc in the plating solution, it acted as a depolarizer for copper electrodeposition and was effective to reduce the unevenness of copper deposits between centre and edge region at high current densities of 10 ASD.
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