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Corrosion and Materials Professional

Exam Details

  • Exam Code
    :API-571
  • Exam Name
    :Corrosion and Materials Professional
  • Certification
    :API Certifications
  • Vendor
    :API
  • Total Questions
    :454 Q&As
  • Last Updated
    :Jun 28, 2025

API API Certifications API-571 Questions & Answers

  • Question 351:

    A form of corrosion that can occur at the junction of dissimilar metals when they are joined together in a suitable electrolyte is __________.

    A. Galvanic corrosion

    B. Anodic corrosion

    C. Cathodic corrosion

    D. All of the above

  • Question 352:

    Metal dusting is preceded by ________ and is characterized by rapid metal wastage.

    A. Decarburization

    B. Carburization

    C. Graphitization

    D. None of the above

  • Question 353:

    Liquid metal embrittlement can occur if 300 Series SS comes in contact with molten _______.

    A. Copper

    B. Mercury

    C. Zinc

    D. Lead

  • Question 354:

    Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).

    A. Oxide

    B. Sulfide scale

    C. Sulfate scale

    D. Caustic scale

  • Question 355:

    With steam blanketing, failure occurs as a result of _________ in the tube from the internal steam pressure at the elevated temperature.

    A. Stress risers

    B. Velocity

    C. Hoop stress

    D. Tensile strength

  • Question 356:

    Susceptibility of an alloy to sulfidation is determined by its ability to form protective _________.

    A. Oxide scales

    B. Sulfide scales

    C. Carbide scales

    D. None of the above

  • Question 357:

    The amplitude and frequency of vibration as well as the _________ of the components are critical factors in vibration-induced fatigue.

    A. Velocity

    B. Temperature

    C. Fatigue resistance

    D. Material properties

  • Question 358:

    Changing to a more corrosion resistant and/or higher hardness material _________ improve cavitation resistance.

    A. Will

    B. May

    C. Will not

    D. May not

  • Question 359:

    With HF acid corrosion, oxygen contamination _________ the corrosion rate of carbon steel and promotes accelerated corrosion and SCC of Alloy 400.

    A. Increases

    B. Decreases

    C. Maintains

    D. Eliminates

  • Question 360:

    Soils having high moisture content, high dissolved salt concentrations and high ________ are the most corrosive.

    A. Oxygen content

    B. Resistivity

    C. Acidity

    D. All of the above

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