Effect of Ni content on the corrosion behavior of Cu–Ni alloys in neutral chloride solutions

Badawy, W. A.; Ismail, Khaled M.; Fathi, Ahlam M.

doi:10.1016/j.electacta.2004.12.030

Cited by 231 publications

(85 citation statements)

References 27 publications

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“…With the immersion time of 432 h, the diameter of capacity loop became bigger again, and then the impedance value still remained large, indicating that the Ni-Co-TiO 2 composite coating still provided good protection for the NdFeB magnet after 432 h immersion in neutral 3.5 wt% NaCl solutions. At the initial stage of the immersion test, the increase in impedance value can be ascribed to the formation and growth of the passive film on the metal surface [17,[32][33][34][35], and indicated the thickening and compaction of the passive film. After the immersion for 240 h, the decrease in impedance value may be resulted from the fact that the passive film suffered from the attack of corrosive medium, e.g., chloride ions, resulting in decrease in thickness and increase in defect.…”

Section: Long-term Immersion Testmentioning

confidence: 99%

“…The fitting of the spectra of Ni-Co-TiO 2 composite coating was attempted by different equivalent electrical circuits, taking into account the previous studies on the metal passive system [17,[32][33][34][35] and fitting error. The best agreement between experiment and fitting, with the error from 1.6 Â 10 À5 to 2.5 Â 10 À3 , was obtained with the equivalent circuit illustrated in Fig.…”

Section: Long-term Immersion Testmentioning

confidence: 99%

“…Two parallel resistance and capacitance (RQ) circuits are used in Fig. 8 to represent the electrochemical activities of the passive film and the film/solution interface, respectively [32][33][34][35]. A constant phase element (CPE) replaced the capacitance of the double layer (C dl ) due to the roughness and inhomogeneity of the electrode surface [31].…”

Section: Long-term Immersion Testmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Yang

Zhang

et al. 2010

Materials & Corrosion

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In this paper, a protective Ni-Co-TiO 2 composite coating was prepared on the sintered NdFeB magnet by direct current electrodeposition. The surface morphologies, microstructure, and chemical composition of the composite coating were studied using scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The surface morphologies and microstructure analysis showed that the composite coating possessed cauliflower-like grain colonies, and formed face-centered cubic (fcc) solid solution. The electrochemical corrosion behaviors of the composite coating in 0.5 mol/L H 2 SO 4 , 0.6 mol/L NaOH, 0.6 mol/L Na 2 SO 4 , and neutral 3.5 wt% NaCl solutions were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS), showing good protection for NdFeB magnet. In order to further investigate the protective properties of the composite coating for NdFeB magnet and the practicability of the composite coating, the long-term immersion test was carried out in neutral 3.5 wt% NaCl solutions using EIS. The results of long-term corrosion test showed that the Ni-Co-TiO 2 composite coating could provide long-term protection in neutral 3.5 wt% NaCl solutions for NdFeB magnet.

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Section: Long-term Immersion Testmentioning

confidence: 99%

Section: Long-term Immersion Testmentioning

confidence: 99%

Section: Long-term Immersion Testmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Yang

Zhang

et al. 2010

Materials & Corrosion

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“…It is clear that the Cu-10Ni-10Zn has the highest total impedance and the higher and more flat phase maximum indicating its passive behavior [44]. The impedance data were analyzed using software provided with the impedance system where the dispersion formula was used [5,45,46]. For a simple equivalent circuit model consisting of a parallel combination of a capacitor, C dl , and a resistor, R ct , in series with a resistor, R s , representing the solution resistance, the electrode impedance, Z, is represented by the mathematical formulation:…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…Copper-zinc alloys are important in civil engineering, as condenser and heat-exchange tubes in the power generation industry, and also as a decorative material in works of art. There are numerous publications on the electrochemical behavior and corrosion resistance of CuNi and Cu-Zn [1][2][3][4][5][6][7] alloys in different solutions. Recently, copper and many copper alloys have been used as antibacterial materials.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Stability of Cu–10Al–10Zn, Cu–10Al–10Ni, and Cu–10Ni–10Zn Ternary Alloys in Simulated Physiological Solutions

Nady

El-Rabiei

2016

J Bio Tribo Corros

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Copper-based alloys are widely used in the consumer electronics industry for components such as connector contacts, shielding gaskets, and terminals. Nickel silver is a general term for alloys that contain copper, nickel, and zinc. Nickel silver first became popular as a base metal for silver-plated cutlery and other silverware, notably electro-plated nickel silver, jewelery and coins. In this article, the electrochemical stability of Cu10Ni-10Zn alloy was compared with that of pure copper and two of copper ternary alloys, namely Cu-10Al-10Zn and Cu-10Al-10Ni in synthetic sweat solution, Hank's solution and in Ringer physiological solution. Corrosion behavior of the different electrodes was investigated using cyclic voltammetry, potentiodynamic polarization, and impedance spectroscopy techniques. The CVs showed peaks concerning the redox reactions for copper. These peaks were assigned to the formation and reduction of copper species. Furthermore, they showed that the copper oxidation was suppressed to a large extent by the presence of Ni and zinc in the alloy composition than the presence of Al and Zn or the presence of Al and Ni elements. Also, the results showed that the Cu-10Ni-10Zn alloy exhibited good corrosion resistance due to the formation of a protective passive film. The electrochemical impedance spectroscopy results indicated that either a duplex film with an inner barrier layer and an outer porous layer or a single passive layer was formed on the surface. The formation of such passive film was discussed, and the different alloy surfaces examined by scanning electron microscopy and subjected to EDAX analysis. The surface analysis has shown the participation of the different alloying elements in the passive film according to the alloy constituents.Graphical Abstract Addition of Ni decreases the rate of corrosion of the Cu, and the Cu-10Ni-10Zn was found to be the most corrosion-resistant alloy.

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Preparation of Ni–Co–Cu Ternary Alloy Coatings by the Low‐Cost Electrochemical Additive Manufacturing

Zhang

Yao

et al. 2021

Adv Eng Mater

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Herein, Ni-Co-Cu ternary alloy coating is prepared by electrochemical additive manufacturing. Using potential as a variable parameter, the morphology, organization phase, composition, and performance of the coating are analyzed. The results show that current density, coating structure, and chemical composition varies depending on the potential parameters. As the potential increases, the thickness of the coating increases (5-10 μm), and the content of Co and Cu decreases (Co: 32.5-16.3 wt%. Cu: 27.6-8.7 wt%). The coating has a distinct multilayer structure with a thickness of nanometers per layer. The Ni-Co-Cu coatings prepared herein are all FCC nanocrystalline structures (90-100 nm). In a 3.5 wt% NaCl solution, the corrosion resistance of the coating decreases with the increase of potential parameters. The Ni-Co-Cu coating prepared under the lower potential parameter (À2.5 V) has the smallest corrosion current (9.32 Â 10 À6 A cm À2 ) and higher polarization resistance (53 667 Ω cm 2 ).

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Effect of Ni content on the corrosion behavior of Cu–Ni alloys in neutral chloride solutions

Cited by 231 publications

References 27 publications

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Electrochemical Stability of Cu–10Al–10Zn, Cu–10Al–10Ni, and Cu–10Ni–10Zn Ternary Alloys in Simulated Physiological Solutions

Preparation of Ni–Co–Cu Ternary Alloy Coatings by the Low‐Cost Electrochemical Additive Manufacturing

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Effect of Ni content on the corrosion behavior of Cu–Ni alloys in neutral chloride solutions

Cited by 231 publications

References 27 publications

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet

Electrochemical Stability of Cu–10Al–10Zn, Cu–10Al–10Ni, and Cu–10Ni–10Zn Ternary Alloys in Simulated Physiological Solutions

Preparation of Ni–Co–Cu Ternary Alloy Coatings by the Low‐Cost Electrochemical Additive Manufacturing

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Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO₂ composite coating prepared on sintered NdFeB magnet