API 571 Certification (Corrosion & Materials) Practice Test

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Which alloy type is often recommended for marine applications due to its corrosion resistance?

Copper alloys
Duplex stainless steel
Carbon steel
Aluminum alloys

The correct answer is: Duplex stainless steel

Duplex stainless steel is specifically designed to provide excellent corrosion resistance, making it a popular choice for marine applications. The combination of both austenitic and ferritic microstructures in duplex stainless steel offers superior strength and resistance to various forms of corrosion, including pitting and crevice corrosion, which are particularly concerning in marine environments where exposure to saltwater is common. This alloy type typically contains a higher concentration of chromium and molybdenum compared to standard stainless steels, which enhances its ability to withstand aggressive corrosive media. The dual-phase structure gives duplex stainless steels a high resistance to stress corrosion cracking, an important factor in marine settings where tensile stresses and corrosive environments can co-exist. In contrast, while copper alloys and aluminum alloys do have certain corrosion-resistant properties, they may not provide the same level of protection and strength as duplex stainless steel under severe marine conditions. Carbon steel, on the other hand, is prone to rust and corrosion unless it is specially treated or coated, making it ill-suited for marine applications.