The thin layer of oxide on the surfaces of these metals acts as a protective layer, preventing further oxidation of the metal by shielding it from direct contact with oxygen in the air.
What is the role of the thin layer of oxide on the surfaces of metals like magnesium, aluminium, zinc, and lead?
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The thin layer of oxide that forms on the surfaces of metals like magnesium, aluminum, zinc, and lead serves as a protective barrier against further oxidation or corrosion. This oxide layer acts as a passive coating, preventing direct contact between the metal and environmental factors such as moisture or oxygen. In the case of aluminum, for example, the thin layer of aluminum oxide protects the underlying metal from corrosion. Similarly, magnesium, zinc, and lead develop oxide layers that help maintain the integrity of the metal by resisting deterioration caused by exposure to air and moisture, enhancing the metals’ overall durability and stability.