Corrosion due to acidic sour water containing H₂S at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO₂) may also be present. Which of the following materials is susceptible to sour water corrosion?

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Carbon steel is susceptible to sour water corrosion due to the acidic and corrosive nature of the environment. Stainless steel, including both 300 and 400 series, is more resistant to sour water corrosion but may still corrode in certain conditions. However, carbon steel is the most vulnerable.

Corrosion Due to Acidic Sour Water Containing H₂S at a PH