API 571 Certification (Corrosion & Materials) Practice Test

Acidic media has a significant impact on metals, primarily leading to increased corrosion. In an acidic environment, the concentration of hydrogen ions (H⁺) is higher, which can react with metal surfaces. This reaction can accelerate the dissolution of the metal, resulting in a higher corrosion rate.

Acids can strip protective oxide layers that may naturally form on some metals, rendering them more susceptible to further attack by the acid or other corrosive agents. For instance, metals like zinc, aluminum, and even iron will corrode more rapidly when exposed to acidic solutions. The presence of acids can facilitate the electrochemical reactions that contribute to corrosion, such as the anodic and cathodic processes occurring on a metal surface.

In contrast, other options suggest that acidic media protects metals, has no effect, or strengthens them, which does not align with the known corrosion behaviors of metals in acidic environments.