Effect of nickel content on the corrosion and passivation of copper-nickel alloys in sodium sulfate solutions

The effect of Ni content on the corrosion and passivation behaviors of copper-nickel alloys with different Cu to Ni ratios was investigated in neutral sulfate solutions. The influence of working conditions (e.g., immersion time, sulfate ions concentration, and temperature) on the electrochemical beh...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2004-09, Vol.60 (9), p.795-803
Main Authors: ISMAIL, K. M, FATHI, A. M, BADAWY, W. A
Format: Article
Language:English
Subjects:
Alloys
Analytical methods
Applied sciences
Copper
Corrosion
Corrosion effects
Corrosion environments
Corrosion mechanisms
Corrosion resistance
Corrosion resistant alloys
Cupronickel
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrode polarization
Equivalent circuits
Exact sciences and technology
Immersion
Impedance
Metals. Metallurgy
Nickel
Nickel alloys
Passivity
Ratios
Sodium
Sodium sulfate
Spectroscopy
Stability
Submerging
Sulfate resistance
Sulfates
Working conditions
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Summary:The effect of Ni content on the corrosion and passivation behaviors of copper-nickel alloys with different Cu to Ni ratios was investigated in neutral sulfate solutions. The influence of working conditions (e.g., immersion time, sulfate ions concentration, and temperature) on the electrochemical behavior of the different alloys was also studied. In this respect, conventional electrochemical methods like open-circuit potential (OCP) measurements, polarization techniques, and electrochemical impedance spectroscopy (EIS) were used. It was found that the initial corrosion resistance is relatively low for alloys with high nickel content. An increase in the nickel content and long immersion time in the neutral sulfate solution increases the corrosion resistance of the alloy and improves its stability. The stability of the alloy was considered to be due to the formation of a stable passive film on its surface. The impedance data were fitted to theoretical data obtained according to an equivalent circuit model describing the electrode/electrolyte interface. The mechanism of the alloy passivation was discussed in view of the obtained results.
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3287859