Funeral Arts National Board Practice Exam

Which metal alloy is known for its rust-resistant properties and often includes chromium and nickel?

1. Aluminum alloy

2. Carbon steel

3. Stainless steel

4. Copper alloy

The correct answer is: Stainless steel

Stainless steel is recognized for its exceptional rust-resistant properties due to its composition, which typically includes chromium and nickel. The presence of chromium is particularly vital, as it forms a passive oxide layer on the surface of the steel when exposed to oxygen, effectively preventing corrosion. Nickel, on the other hand, enhances the strength and ductility of the alloy, further contributing to its durability in various environments. In contrast, aluminum alloys, while lightweight and resistant to corrosion, do not possess the same level of structural strength or heat resistance as stainless steel. Carbon steel, although strong and commonly used in construction, is prone to rusting if not properly coated or treated, as it lacks the protective alloying elements found in stainless steel. Copper alloys are not typically known for rust resistance; instead, they have antimicrobial properties and are often used in plumbing and electrical applications. This makes stainless steel the go-to choice for applications requiring both strength and corrosion resistance, such as in marine environments, kitchens, and medical equipment.