Quiz 2026 Useful API-571: Vce Corrosion and Materials Professional Free

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API API-571 Exam Syllabus Topics:

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

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API Corrosion and Materials Professional Sample Questions (Q114-Q119):

NEW QUESTION # 114
The loss in strength from spheroidization (Softening) is usually accompanied by a(n) _________ in ductility, which allows for deformation at stress concentrations.

Answer: B


NEW QUESTION # 115
Microbiologically induced corrosion is largely independent of the:

Answer: B

Explanation:
From API RP 571 on Microbiologically Influenced Corrosion (MIC):
"MIC depends on the presence of water, nutrients, and specific microbial species such as SRB (sulfate- reducing bacteria)."
"While flow velocity may influence deposition and oxygen content, MIC can occur in both stagnant and flowing systems. Hence, it's not strongly dependent on velocity." Thus, option D is correct - MIC is largely independent of flow velocity.


NEW QUESTION # 116
Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called ______. It is most often found in heavy wall sections.

Answer: C


NEW QUESTION # 117
Which of the following is not a major factor associated with corrosion by sulfidation?

Answer: C


NEW QUESTION # 118
Which of the following weldments is most susceptible to dissimilar metal cracking when operating at high temperatures?

Answer: D

Explanation:
Dissimilar Metal Cracking (DMC) is a form of high-temperature cracking that frequently occurs in weld joints between carbon steel and austenitic stainless steel (such as Type 316 SS) due to differences in thermal expansion coefficients and mechanical properties.
From API RP 571 Section 5.2.3.1 (Dissimilar Metal Weld Cracking):
"Cracking frequently occurs in weld joints between ferritic and austenitic materials such as carbon steel to
300 series stainless steels due to thermal expansion mismatch during high temperature operation." Therefore, Option D (Carbon steel to 316 stainless steel) is the most susceptible combination and the correct answer.


NEW QUESTION # 119
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