The Oxidation of Iron to Rust Is a Problem Structural

question 70

Multiple Choice

The oxidation of iron to rust is a problem structural engineers need to be concerned about, but the oxidation of aluminum to aluminum oxide is not. Why?

• A)Since aluminum is so light and inexpensive, it is easily replaced when corroded.
• B)Aluminum oxide is insoluble in water and thus forms a protective coating that prevents continued oxidation of the aluminum.
• C)Aluminum oxide is even stronger than aluminum.
• D)The oxidation of aluminum is a very slow reaction, taking hundreds of years before any structural changes are noticed.

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