API 571 Certification (Corrosion & Materials) Practice Test

What materials are preferred for environments with phenolic corrosion?

1. 400 series stainless and Alloy 20

2. Carbon steels and 300 series stainless

3. Nickel alloys only

4. Copper and brass only

The correct answer is: Carbon steels and 300 series stainless

In environments where phenolic corrosion is a concern, materials that possess good resistance to chemical attack from phenolic compounds are essential. The correct choice includes carbon steels and 300 series stainless steels, which are known for their relatively better performance in such scenarios compared to other materials. Carbon steels can work in specific environments but may require additional protective measures such as coatings or galvanization depending on the severity of the conditions. The 300 series stainless steels, which include grades like 304 and 316, provide enhanced corrosion resistance due to their higher chromium and nickel contents. These properties help them withstand various corrosive environments, including those containing phenolic compounds, making them more suited for applications where these chemicals are present. The other materials listed in the options either lack sufficient resistance to phenolic corrosion or are not typically utilized in such applications. Therefore, carbon steels and 300 series stainless steels are preferred choices for their balance of mechanical properties and corrosion resistance in environments exposed to phenolics.