API-571 Dumps (V9.02): Master Your Corrosion and Materials Professional Exam with Confidence 2026

1. Which damage mechanism will not benefit much from PWHT mitigation?

2. Which of the following is the main concern for the potential of brittle fracture in typical process service?

3. At what minimum level of nickel content does an alloy become nearly immune to chloride stress corrosion cracking?

4. Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

5. Generally, to minimize corrosion of carbon steel in hydrofluoric acid service, residual elements (Cr,

Ni, Cu) should be less than:

6. 1.Cooling water corrosion of exchanger tubes is typically increased by:

7. Which of the following is the best description of the surface appearance of metals with chloride stress corrosion cracking?

8. Phosphoric acid corrosion in polymerization units is usually found under what circumstances?

9. Which of the following will be most effective in finding sour water corrosion?

10. The likelihood of brittle fracture is best lessened by:

11. The 300 series stainless steels (austenitic stainless steels) are generally resistant to oxidation up to what temperature?

12. For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance?

13. Temper embrittlement is a metallurgical change that is:

14. 300 series austenitic stainless steels susceptible to polythionic acid stress corrosion cracking (PTA SCC) can become sensitized when heated in the range of:

15. The stream from a crude atmospheric overhead goes to the tube side of a shell-and-tube condenser with a temperature of 300°F (149°C) and a pressure of 10 psig (69 kPa). As the stream begins to condense water, its hydrochloric acid content lowers the water pH to about 4.0.

Which of the following would be the best alloy selection for the tubes with cooling water on the shell side?

16. During inspection of a process unit where sulfidation from high-temperature hydrogen exists in H ₂ S streams, the inspector should:

17. To detect wet insulation that might give rise to corrosion under insulation, which nondestructive examination (NDE) technique would be most useful?

18. A nickel-based buttering layer is often used when welding austenitic stainless steels to carbon steels to avoid dissimilar weld metal cracking because:

19. What is the best way to inspect for brittle fracture?

20. Which of the following damage mechanisms is related to steel hardness?

21. The primary cause of ammonium chloride corrosion is the formation of salts:

22. Which of the following generally manifests itself as a subsurface damage mechanism?

23. Which of the following damage mechanisms are most closely related because they occur in similar environments?

24. Which of the following locations would be most susceptible to naphthenic acid corrosion (NAC)?

25. Which of the following is a critical factor for chloride stress corrosion cracking?

26. Which of the following is considered resistant to cracking in hydrofluoric acid service?

27. Aggressive ammonium chloride corrosion often occurs:

28. Which of the following is most susceptible to chloride stress corrosion cracking?

29. Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)?

30. Which of the following is related to all wet H ₂ S damage mechanisms?

31. Differential expansion in bimetallic welds can give rise to:

32. Refer to the following table:

Corroded End ― Anodic (More Active)

Magnesium

Magnesium alloys

Zinc

Aluminum

Aluminum alloys

Steel

Cast iron

Type 410 SS (active state)

Ni-Resist

Type 304 SS (active state)

Type 316 SS (active state)

Lead

Tin

Nickel

Brass

Copper

Bronze

Copper-Nickel

Monel

Nickel (passive state)

Type 410 SS (passive state)

Type 304 SS (passive state)

Type 316 SS (passive state)

Titanium

Graphite

Gold

Platinum

Protected End ― Cathodic (More Noble)

Which of the following metal combinations is most likely to experience galvanic corrosion in brackish water or seawater?

33. Steel hardness and strength are critical factors for what type of damage mechanism?

34. What type of damage is affected by higher hydrogen partial pressures?

35. Dissimilar metal weld cracks (between ferritic and austenitic materials) form:

36. Which of the following statements is most accurate with regard to thermal fatigue?

37. In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH ₄ ?

38. Polythionic acid stress corrosion cracking is:

39. The type of organic acids in crude feedstocks that are of most concern for corrosion in crude unit overheads are those:

40. Boiler water condensate corrosion is caused primarily by:

41. Decarburization damage is normally verified by:

42. At which of the following temperatures would the highest atmospheric corrosion rates be expected?

43. One way to prevent oxide scale formation on alloy steel is to increase the:

44. In most cases, brittle fracture occurs only at:

45. Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF) acid corrosion?

46. Proactive and retroactive positive material identification programs are especially useful for services exposed to:

47. Amine corrosion occurs principally on what class of materials?

48. Caustic corrosion is most often associated with:

49. Temper embrittlement is defined as:

50. Hydrogen permeation or diffusion rates associated with wet H ₂ S damage of carbon steel and low-alloy steels have been found to be minimal at a pH of:

51. Both sulfide stress corrosion cracking and stress-oriented hydrogen-induced cracking are most often found in:

52. Blistering and hydrogen-induced cracking (HIC) damage are most affected by what aspect of steels?

53. Damage from oxidation is usually determined by:

54. The most effective means of preventing caustic stress corrosion cracking is:

55. Carbonate stress corrosion cracking and alkaline stress corrosion cracking are: