What characteristic defines a rivet that is effective in joining magnesium alloys?

A rivet that is effective in joining magnesium alloys is primarily defined by its corrosion resistance. Magnesium alloys are notably susceptible to corrosion, particularly in humid environments or when they come into contact with dissimilar metals. Rivets designed for use with magnesium must therefore feature protective coatings or materials that prevent corrosion to ensure long-term durability and structural integrity of the joint.

This characteristic is crucial because even minor corrosion can lead to significant weakening of the riveted structure, potentially resulting in failure under load. The use of corrosion-resistant rivets helps mitigate these risks and prolongs the lifespan of the assembly using magnesium alloys.

While factors such as welding temperature, tensile strength, and compatibility with other metals like aluminum are important in various contexts, they do not directly address the specific challenges posed by magnesium alloys, making corrosion resistance the defining feature for rivets in this application.