Which metal is the longest lasting?

• A. Copper
• B. Aluminum
• C. Steel
• D. Brass

Answer: (A)

Longevity in service is largely about how well a metal resists corrosion and wear. Copper forms a thin, stable protective oxide layer that slows further corrosion, so parts made of copper can stay sound for decades without heavy protection. Steel, while strong, will corrode in moist environments unless coated or protected, eventually weakening. Aluminum resists many forms of corrosion, but its oxide can be softer and under certain wear or environmental conditions it can degrade faster than copper. Brass is more prone to wear and dezincification in some environments, which shortens its life compared to copper. For these common conditions, copper tends to offer the longest service life among the options.