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Cupronickel or copper–nickel (CuNi) is an alloy of copper with nickel, usually along with small quantities of other elements added for strength, such as iron and manganese. The copper content typically varies from 60 to 90 percent.
May 12, 2018 · Cupronickel (also referred to as "cupernickel" or copper-nickel alloy) refers to a group of copper-nickel alloys that are used in saltwater environments due to their corrosion resistant properties.
cupronickel, any of an important group of alloys of copper and nickel; the alloy containing 25 percent nickel is used by many countries for coins. Because copper and nickel mix readily in the molten state, the useful range of alloys is not confined within any definite limits.
- The Editors of Encyclopaedia Britannica
Learn key differences between cupronickel and copper alloys, including their unique properties, uses, and common applications in engineering.
Cu-Ni tubes are used at refiners where they are exposed to monoethanolamine (MEA), which is used in aqueous solutions for scrubbing weakly acidic gases. Shalaby et al. (2007) investigated the SCC behavior of Cu-Ni (70–30) alloy in 18 wt% MEA solution.
Cupronickels are copper-nickel alloys that typically contain from 60 to 90 percent of copper and nickel as the main alloying element. The two main alloys are 90/10 and 70/30. Other strengthening elements, such as manganese and iron, maybe also contained. Cupronickels have excellent resistance to corrosion caused by seawater.
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What coins are made of cupronickel?
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In principle, a cupronickel can contain between 1% and 49% nickel, such that copper remains the main element (otherwise, you would call it a nickel-copper alloy). Both copper and nickel are completely soluble in each other, which supports a very wide range of compositions.
