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API API-571 Exam Syllabus Topics:

SectionObjectives
Damage Mechanisms- Uniform or Localized Loss of Thickness
  • 1. Cooling Water Corrosion
  • 2. Microbiologically Influenced Corrosion (MIC)
  • 3. Boiler Water / Condensate Corrosion
  • 4. Atmospheric Corrosion
  • 5. Soil Corrosion
  • 6. Caustic Corrosion
  • 7. Dealloying (Selective Leaching)
  • 8. Corrosion Under Insulation (CUI)
  • 9. Flow-Accelerated Corrosion (FAC) / Flow-Assisted Corrosion
  • 10. Flue Gas Dew Point Corrosion
  • 11. CO2 Corrosion
  • 12. Galvanic Corrosion
- General / Mechanical
  • 1. Sigma Phase Embrittlement
  • 2. Metal Dusting
  • 3. Creep / Stress Rupture
  • 4. Fatigue
  • 5. Brittle Fracture
  • 6. Atmospheric Corrosion
  • 7. Stress Relief Cracking
  • 8. Erosion/Erosion-Corrosion
  • 9. Vibration-Induced Fatigue
  • 10. Zinc Embrittlement
  • 11. Mechanical Fatigue
  • 12. Strain Aging
  • 13. Cavitation
  • 14. Corrosion Under Insulation (CUI)
  • 15. Liquid Metal Embrittlement (LME)
  • 16. Softening (Spheroidization)
  • 17. Temper Embrittlement
  • 18. 885°F (475°C) Embrittlement
  • 19. Graphitization
  • 20. Fretting / Fretting Corrosion
  • 21. Dissimilar Metal Weld (DMW) Cracking
  • 22. Thermal Fatigue
  • 23. Galvanic Corrosion
  • 24. Hydrogen Embrittlement
- High Temperature Corrosion (800°F / 425°C and above)
  • 1. Carburization
  • 2. Metal Dusting
  • 3. Fuel Ash Corrosion
  • 4. Oxidation
  • 5. Nitriding
  • 6. Sulfidation
- High-Temperature Hydrogen Attack (HTHA)
  • 1. Decarburization
  • 2. Internal Hydrogen Attack (IHA)
- Environment-Assisted Cracking
  • 1. Chloride Stress Corrosion Cracking (Cl-SCC)
  • 2. Carbonate Stress Corrosion Cracking
  • 3. Caustic Stress Corrosion Cracking
  • 4. Amine Stress Corrosion Cracking
  • 5. Polythionic Acid Stress Corrosion Cracking (PTA-SCC)
  • 6. Stress-Oriented Hydrogen-Induced Cracking (SOHIC)
  • 7. Ethanol Stress Corrosion Cracking (SCC)
  • 8. Ammonia Stress Corrosion Cracking
  • 9. Hydrogen-Induced Cracking (HIC) / Stepwise Cracking
  • 10. Sulfide Stress Cracking (SSC) / Hydrogen Stress Cracking
  • 11. Hydrogen Embrittlement

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API Corrosion and Materials Professional Sample Questions (Q75-Q80):

NEW QUESTION # 75
In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?

Answer: D

Explanation:
According to API RP 571 Section 5.1.2.1 (Hydrogen-Induced Cracking) and Publ 939-A, blistering in carbon and low alloy steels exposed to wet H2S environments can be exacerbated by the presence of cyanides
. These accelerate hydrogen entry into steel, increasing the chance of hydrogen blistering.
* API RP 571 states:
"HIC and blistering are forms of hydrogen damage that occur in wet H2S environments. The presence of cyanides can significantly increase hydrogen entry and the risk of blistering."
* Publ 939-A (Research on Cracking in Wet H2S Service) also notes:
"Cyanides act as catalytic agents in hydrogen charging, which promotes internal pressure build-up and increases blistering." Thus, cyanides (Option B) are the most critical in enhancing blistering in H2S environments.


NEW QUESTION # 76
Stress levels and __________ are the critical factors causing carbonate stress corrosion cracking.

Answer: C


NEW QUESTION # 77
Sigma phase occurs in Ferritic, martensitic, austenitic and duplex stainless steels when exposed to temperatures in the range of _____.

Answer: A


NEW QUESTION # 78
Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

Answer: C

Explanation:
API RP 571 on Naphthenic Acid Corrosion (NAC) details:
"NAC is most aggressive in two-phase flow where the shear stress is high, such as in elbows, reducers, and at orifices."
"High velocity and turbulence in two-phase flow strip protective layers and accelerate corrosion." Therefore, option A is the correct and most critical phase.


NEW QUESTION # 79
Spheroidization and graphitization are competing mechanisms that occur at overlapping
temperature ranges. Spheroidization tends to occur preferentially above _______ while graphitization predominates below this temperature.

Answer: C


NEW QUESTION # 80
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