What alloy element most improves naphthenic acid corrosion (NAC) resistance?
A.
Molybdenum
B.
Chromium
C.
Niobium
D.
Nickel
The Answer Is:
A
This question includes an explanation.
Explanation:
API RP 571, Naphthenic Acid Corrosion:
“Molybdenum significantly improves resistance to naphthenic acid attack. Alloys such as 317, 316Mo, and Alloy 20 are used in severe NAC environments due to higher Mo content.”
“Chromium and nickel play secondary roles; molybdenum is the key element.”
Answer is A – Molybdenum.
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