API 571 Corrosion And Materials

What is the primary corrosion mechanism in refinery amine treating units that causes attack on carbon steel equipment?

Galvanic attack between lean and rich amine streams Acidic conditions from absorbed CO2 and H2S at elevated temperatures Oxidation of amine degradation products forming organic acids Microbiologically influenced corrosion in stagnant amine sections

Correct Answer:

Acidic conditions from absorbed CO2 and H2S at elevated temperatures

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