[Table of common Copper alloys: Brass (Cu+Zn), Bronze (Cu+Sn), German Silver (Cu+Zn+Ni)]
Gun metal is used for making gears, bearings, and heavy-duty machine parts due to its high strength and corrosion resistance.
The question asks us to identify the major components of "Gun Metal." Let's explore each given option to find the correct answer.
Cu, Sn and Zn: Gun metal is a type of bronze, an alloy primarily comprising copper (Cu), tin (Sn), and usually zinc (Zn). This option describes the traditional composition of gun metal. It has high resistance to corrosion from steam and saltwater and is used for making pipes, valves, and other products that require a durable, corrosion-resistant metal.
Cu, Zn and Ni: This alloy's composition corresponds to brass, not gun metal. Brass is mainly composed of copper and zinc and sometimes nickel, which enhances its corrosion resistance and strength. However, it is not used as gun metal.
Cu, Ni and Fe: This composition is related to cupronickel, known for its strong resistance to corrosion and is commonly used in coinage and marine applications as opposed to gun metal.
Al, Cu, Mg and Mn: This combination describes an aluminum alloy, often used in aerospace applications due to its lightweight and strength properties. This does not match gun metal.
Based on the above analysis, the correct option is:
Cu, Sn and Zn
Conclusion: The major components of gun metal are copper, tin, and zinc, making the correct answer to this question Cu, Sn and Zn.
