Papers by Keyword: Cu-Ni Alloys

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Authors: E.M. Arce Estrada, N.E. Torres-González, Victor M. López-Hirata
Authors: Jaroslav Balík, Miloš Janeček, Pavel Lukáč
Authors: Wei Wu, Chao Zhao, Yuan Hui Weng, Zong Qiang Luo, Wei Wen Zhang
Abstract: Effect of Cr addition on microstructure and mechanical property of Cu-17Ni-3Al-1.2Fe alloy were investigated by means of tensile testing, optical microscope (OM), scanning electronic microscope (SEM) and transmission electronic microscope (TEM). The results showed that the morphology and type of second phases which exist among dendrites change significantly with the addition of 0.85 wt % Cr. A lot of rod-like and multi-branched Cr-rich phases can be observed while the formation of Ni3Al is suppressed. However, Cr addition does not change the type of particle-like Ni3Al which evenly distributes in the matrix. With the addition of Cr in Cu-17Ni-3Al-1.2Fe alloy, the tensile strength, yield strength and Brinell hardness increase, especially the yield strength with the increase of 31%, however, the elongation decreases slightly.
Authors: Cláudio José da Rocha, Edval G. de Araújo, Rejane A. Nogueira, Francisco Ambrozio Filho
Authors: Ghalia A. Gaber, Maamoun A. Maamoun, Wafaa A. Ghanem
Abstract: The aim of this article describes the application of green tea aqueous extract as an eco-friendly corrosion inhibitor for two Cu-Ni alloys in 3.5% NaCl solution. This ability has been studied by using electrochemical techniques (i.e. PDP, CT and EIS), IR spectroscopy measurements and the surface analysis technique (i.e. SEM/EDX). This ability was compared with it's of a commercial cooling water (green water). The results show that tested extract exhibited a good ability to decrease the corrosion rate of alloys in 3.5% NaCl solution.The inhibition efficiency of the green water and green tea extract inhibitors increased with increasing the concentration and decreased with increasing the temperature. The inhibition efficiency of two Cu-Ni alloys which reaching ̴ 91.5% and ̴ 93.9% with 50 % green tea aqueous extract for Cu-10 Ni and Cu-30 Ni alloy, respectively. Electrochemical impedance showed that the change in charge transfer resistance (Rct) and double layer capacity (Cdl) which adsorbed on the alloy surface. Adsorption of the inhibitors gives a good fit to Langmuir isotherm model. Some thermodynamic parameters of activation and adsorption processes were also determined and discussed. Surface examination studies by SEM and EDX confirm the presence of protective film on the alloy surface. In the present study, we investigated the corrosion of the Cu-Ni (cupronickel) alloys in 3.5 % NaCl environment to simulate the seawater desalination plants conditions. Therefore, the future studies can be focused on the development of polymeric compounds used as self- healing or production of new natural corrosion inhibitors especially recommended the waste product of green tea.
Authors: P.A. Thorsen, J.B. Bilde-Sørensen
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