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Corrosion Resistance of Copper-Nickel Alloy

2018-8-20      View:

At present, there are many researches on the corrosion problems caused by copper-nickel alloys. Experts in domestic and abroad have done a lot of effective and meticulous work and got a lot of important information. Experts systematically studied the corrosion behavior of Cu-Ni alloy in seawater system through various conventional surface analysis (metallographic, Auger, scanning electron microscopy, transmission electron microscopy, etc.) and electrochemical methods, revealing surface film defects. , grain boundary defects and other experimental phenomena and internal basis for accelerating the corrosion process of copper-nickel alloys, especially revealing some main factors affecting the stability of alloy seawater corrosion products, such as alloy composition, deformation, temperature, microorganisms, flow rate, S2- Ion, corrosion inhibitor and PH.

 

Copper and copper alloys can form an oxide film on the surface of chloride-containing medium. The corrosion resistance depends on the surface film layer. Therefore, the composition characteristics and protective properties of the surface film of copper-nickel alloy have been the hotspots of research. People have done a lot of research on this and made great progress, which has deepened people's understanding of the corrosion resistance of copper-nickel alloy to a certain extent, which is helpful to further explore the corrosion mechanism of the alloy.

 

The corrosion resistance of Cu-N i alloy in seawater depends largely on the quality and integrity of the protective film (secondary film) formed on the surface. The good protective film is yellow-green (green) or brass, thin and uniform, dense and complete, with strong adhesion. In seawater, the formation of the protective film is complex and is affected by many factors such as material and medium, and the primary condition is the original surface quality of the alloy.


The research on the corrosion resistance of copper-nickel alloy should not only consider the performance of the alloy material itself, but also the influence of different environmental factors, and select the corresponding corrosion inhibitor for different environmental media to increase the corrosion resistance of the alloy; The corrosion resistance of copper-nickel alloys was investigated at the microscopic or molecular level using in situ and microscopic techniques.