Question

Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters, etc.). The reason for the corrosion durability of aluminum is that?

1) aluminum does not react with oxygen.
2) very unreactive aluminum oxide forms a thin layer on aluminum.
3) aluminum does not undergo oxidation.
4) all aluminum products are treated with a plastic coating.

Answer 1

Aluminum's corrosion durability is due to the formation of a very unreactive aluminum oxide layer that forms on its surface, which protects it from further corrosion. Option 2

Step-by-step explanation:

Aluminum is known for its corrosion resistance, which is primarily due to the rapid formation of a thin layer of aluminum oxide when the metal is exposed to air. This oxide layer acts as a protective barrier, preventing further oxidation of the aluminum beneath it.

While iron is more susceptible to corrosion and can rust when exposed to oxygen and moisture, the aluminum oxide layer on aluminum is very stable and adheres well to the metal, protecting it from further corrosive processes. This is the reason why aluminum is preferred for applications where iron would corrode, such as in the manufacture of cans, rain gutters, and construction materials.

While option 4 mentions that aluminum products are treated with a plastic coating, this is an additional step used specifically for aluminum cans to prevent the beverage from reacting with the oxide layer. However, the primary reason for aluminum's corrosion resistance is the formation of the unreactive layer of aluminum oxide, making option 2 the correct answer.