What are the differences between aluminum and steel used in automobiles?
1 Answers
Here are the differences between aluminum and steel used in automobiles: 1. Different weights: The most intuitive difference between aluminum and steel is the significant difference in density. If you hold them in your hand, the heavier one is steel, and the lighter one is aluminum. 2. Different surfaces: Aluminum does not rust in the air but only undergoes natural oxidation, appearing silver-white or dark gray. The natural surface of steel appears dull or rusty. 3. Different hardness: Steel is very hard, harder than most objects in nature. In contrast, aluminum is much less hard than steel. If you scratch them against each other, the harder one is steel. 4. Different magnetism: Ordinary steel objects are attracted to magnets, while aluminum has almost no magnetism. 5. Different resistivity: When measuring the resistivity of the two materials with a multimeter, aluminum has the lowest resistivity among various metal materials, and its conductivity is higher than that of steel.