Which metal is the most likely to corrode?

• A. Aluminum
• B. Iron
• C. Magnesium
• D. Copper

Answer: (C)

Magnesium is particularly prone to corrosion due to its position in the galvanic series and its reactivity. It is classified as a highly reactive metal and tends to react readily with water and humidity in the environment, leading to the formation of corrosion products. When in contact with moisture, magnesium can undergo rapid oxidation, resulting in the loss of metal integrity.

In environments where it is exposed to air and moisture, magnesium will corrode faster than many other metals—steel or aluminum, for example. This makes it a good choice for applications that require lightweight materials, but also necessitates the application of protective coatings or treatments to mitigate the corrosion risk. Understanding the specific environmental conditions and the nature of their corrosion behavior is crucial for the effective use of magnesium in various applications.