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RISS 인기검색어
- 검색키워드
- 주제어 : Immersion copper (검색결과 3 건)
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Corrosion Property Evaluation of Copper Alloy Tubes against Sea Water
Pang Beilli,Ong Sang-kil,Lee Hong-Ro 한국표면공학회 2009 한국표면공학회지 Vol.42 No.6
In this study, the corrosion property of copper alloy tubes in seawater has been investigated. Three copper alloys of nominal composition Cu-20Zn-2Al(Al-Brass), Cu-30Ni(CN70/30) and Cu-10Ni(CN90/10) were considered. The samples were immersed in 3%NaCl flowing solution at 90℃ for 30, 50 and 80 days. Corrosion rate of copper alloy tubes in 3%NaCl flowing solution was investigated by weight-loss measurements and electrochemical test. The CN70/30 showed lowest corrosion rate among three copper alloy tubes. Because of passive films formation, corrosion rates of three types of copper tubes were decrease with time. Surface characteristics of copper alloy tubes were analyzed by optical micrograph(OM), scanning electronic microscopy (SEM), energy dispersive X-ray analysis(EDAX) and X-ray diffraction patterns(XRD). CN70/30 showed partly pitting problem on the surface owing to high Fe content, even though having high resistant against corrosion. Cracks appeared on the surface of CN90/10 and CN70/30 after more than 50 days immersion, which could be derived from high nickel contents.
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착화제를 이용한 치환동 도금층의 밀착력 향상에 관한 연구
구석본(Seokbon Koo),전준미(Jumi Jeon),허진영(Jinyoung Hur),이홍기(Hongkee Lee) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.1
Amino-carboxyl acid as a complexing agent in acid copper sulfate solution was utilized to improve the adhesion of immersion copper layer for steel wire. According to the tape test results, regardless of alloy composition of the wire, the adhesion of immersion copper layer was improved with the addition of aminocarboxyl acid. The incorporation of H and Fe in the plating layer was analyzed by TOF-SIMS. The H and Fe were detected at the entire coating layer without any addition of amino-carboxyl acid. However, with addition of amino-carboxyl acid, the H and Fe were scarcely detected at the coating layer.
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Kim, Soon Tae,Park, Yong Soo,Kim, Hyung Joon 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.2
Effects of Cu and S on corrosion resistance and machinability of austenitic stainless steel were investigated using immersion test, metallographic examination, Auger surface analysis and tool life test with single point turning tools. Corrosion resistance of the experimental Cu containing alloys in 18.4N H₂S0₄at 80-120℃ and 3N HCl at 40℃ decreased as S content increased. However, one of the experimental alloys (Fe-18%Cr-21%Ni-3.2%Mo-1.6%W-0.2%N-3.1%Cu-0.091%S)showed general and pitting corrosion resistance equivalent to that of CW12MW in highly concentrated SO4^2- environment. The alloy also showed pitting corrosion resistance superior to super stainless steel such as 654SMO in C1- environment. The reasons why the increase in S content deteriorated the corrosion resistance were first, that the number and size of (Mn, Cr)S sulfides having corrosion resistance lower than that of matrix increased, leading to pitting corrosion and second, that rapid dissolution of the matrix around the pits was caused by adsorbed S. However, the alloy containing 3.1Wu and 0.091% S maintained high general and pitting corrosion resistance due to heavily enriched noble Cu through selective dissolution of active Fe and Ni. The tool life for 3.1%Cu + 0.091%S added alloy was about four times that of 0.06%Cu + 0.005%S added alloy due to high shear strain rate generated by Cu addition giving easy cross slip of dislocation, lubrication of ductile (Mn, Cr)S sulfides adhering to tool crater surface and low cutting force resulting from thin continuous sulfides formed in chips during machining.
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