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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 201:

    Carbon dioxide corrosion results when CO?dissolves in water to form _________ acid.

    A. Sulfuric

    B. Hydrochloric

    C. Carbonic

    D. None of the above

  • Question 202:

    In general, the resistance of iron and nickel based alloys to sulfidation is determined by the ________ content of the material.

    A. Chromium

    B. Carbon

    C. Molybdenum

    D. Alloying

  • Question 203:

    The removal of surface material by impacting materials is called:

    A. Erosion

    B. Erosion corrosion

    C. Erosion or erosion corrosion

    D. IPC (imparting particle corrosion)

  • Question 204:

    Temper embrittlement is a metallurgical change that is not readily apparent and can be confirmed through ________.

    A. Metallographic examination

    B. Impact testing

    C. Metallography

    D. None of the above

  • Question 205:

    Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.

    A. Axial

    B. Diagonal

    C. Transverse

    D. Angular

  • Question 206:

    Carbon steel and low alloy steels are subject to excessive hydrochloric acid corrosion when exposed to any concentration of HCl acid that produces a pH below______.

    A. 6.0

    B. 5.5

    C. 5.0

    D. 4.5

  • Question 207:

    Oxygen and iron in the wash water injected into reactor effluent can lead to __________ corrosion and fouling.

    A. Increased

    B. Decreased

    C. Substantial

    D. Minimal

  • Question 208:

    Soil corrosion of carbon steel can be minimized through the use of special backfill, coatings and _______.

    A. Cathodic protection

    B. Resistivity

    C. Temperature

    D. None of the above

  • Question 209:

    Convert these temperatures – 156º C and 450º F

    A. 304º F, 151º C

    B. 284º F, 218º C

    C. 312º F, 232º C

    D. 296º F, 246º C

  • Question 210:

    Stainless steel cyclones, piping ductwork and valves in high temperature FCC regeneration service are susceptible areas for _________.

    A. Brittle fracture

    B. Sigma phase

    C. Cavitation

    D. Corrosion fatigue

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