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API Corrosion and Materials Professional Sample Questions (Q72-Q77):

NEW QUESTION # 72
Phosphoric acid corrosion in polymerization units is usually found under what circumstances?

A. Low velocity areas
B. Two-phase flow
C. Turbulent flows
D. When the acid dries out

Answer: D

Explanation:
API RP 571 states under the section Phosphoric Acid Corrosion:
"Corrosion usually occurs when the acid dries out and forms concentrated phosphoric acid deposits, which are very aggressive to carbon steel."
"Drying or concentration occurs due to poor flow distribution or operational upsets. Localized areas may experience acid concentration due to vaporization." (Reference: API RP 571, Section 4.3.3.8 - Phosphoric Acid Corrosion) Therefore, the most aggressive corrosion occurs when the acid dries out, making option D correct.

NEW QUESTION # 73
Blistering, HIC and SOHIC have been found to occur between ambient and ________.

A. 300º F
B. 250º F
C. 350º F
D. 400º F

Answer: A

NEW QUESTION # 74
Carbon dioxide (CO(2)) corrosion results when CO(2) dissolves in water to form ________.

A. Hydrofluoric acid
B. Carbonic acid
C. None of the above
D. Carbon monoxide

Answer: B

NEW QUESTION # 75
Major factors affecting sulfidation are alloy composition, temperature and ________.

A. Concentration of hydrogen
B. Stress
C. Time
D. Concentration of sulfur

Answer: D

NEW QUESTION # 76
Cracks formed by carbonate stress corrosion are best detected:

A. with a penetrant testing technique used after abrasive or high pressure water blasting of the surface.
B. with a wet fluorescent magnetic-particle testing technique.
C. ultrasonic shear wave examination because cracks develop internally.
D. with an Acoustic Emission Testing technique.

Answer: B

Explanation:
According to API RP 571 Section 5.1.2.6 (Carbonate Stress Corrosion Cracking - CSCC):
"The cracking is usually intergranular and is most commonly detected using wet fluorescent magnetic-particle testing (WFMT) after surface cleaning. PT may not be sensitive enough to detect fine cracks formed by this mechanism." Because CSCC cracks are typically surface-connected and very fine, WFMT offers the best visibility, especially after proper surface prep.
Therefore, Option D is correct.

NEW QUESTION # 77
......

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