Page 1 of 147
AMPP/NACE Corrosion Technologist Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
AMPP/NACE Corrosion Technologist Exam – Practice Questions
Exam Content Domains:
Domain Percentage
Corrosion Fundamentals 25%
Corrosion Testing & Monitoring 20%
Cathodic Protection 20%
Corrosion Prevention Methods 20%
Materials Selection & Design 10%
Professional Practice 5%
Key Topics Covered:
• Electrochemical principles
• Corrosion types (galvanic, pitting, crevice, stress corrosion cracking, hydrogen embrittlement)
• Cathodic protection (galvanic & impressed current)
• Coatings and linings
• Corrosion testing methods
• Water chemistry and treatment
• Material selection
• Failure analysis
, Page 2 of 147
Question 1
Which of the following is the most common type of corrosion?
A) Galvanic corrosion
B) Pitting corrosion
C) Uniform corrosion
D) Crevice corrosion
Correct Answer: C
Rationale: Uniform corrosion, also known as general corrosion, is the most common form of corrosion.
It occurs evenly over a metal surface, often resulting in thinning of the material. It is characterized by a
uniform loss of metal thickness across the exposed surface.
Question 2
The electrochemical potential of a metal is measured relative to which reference electrode?
A) Calomel electrode
B) Silver-silver chloride electrode
C) Standard hydrogen electrode (SHE)
D) Copper-copper sulfate electrode
, Page 3 of 147
Correct Answer: C
Rationale: The Standard Hydrogen Electrode (SHE) is the universal reference for measuring
electrochemical potentials. All standard electrode potentials are reported relative to the SHE, which is
assigned a potential of 0.000 V at all temperatures.
Question 3
What is the primary cause of cathodic disbondment in protective coatings?
A) Heat exposure
B) Mechanical impact
C) Alkaline conditions generated at cathodic sites
D) UV radiation
Correct Answer: C
Rationale: Cathodic disbondment occurs when the coating loses adhesion due to alkaline conditions
generated at cathodic sites during cathodic protection. The high pH can degrade the coating and cause it
to lose adhesion to the substrate.
Question 4
Cathodic protection prevents corrosion by making the structure a:
, Page 4 of 147
A) Cathode
B) Anode
C) Neutral electrode
D) Sacrificial electrode
Correct Answer: A
Rationale: Cathodic protection works by making the protected structure a cathode in an electrochemical
cell. This shifts the potential of the structure to a more negative value, preventing the anodic dissolution
reaction from occurring.
Question 5
The Nernst equation relates the electrode potential to which of the following?
A) Temperature only
B) Concentration of ions
C) pH only
D) Both temperature and concentration
Correct Answer: D
Rationale: The Nernst equation relates the electrode potential to both temperature and the
AMPP/NACE Corrosion Technologist Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES JUST RELEASED
AMPP/NACE Corrosion Technologist Exam – Practice Questions
Exam Content Domains:
Domain Percentage
Corrosion Fundamentals 25%
Corrosion Testing & Monitoring 20%
Cathodic Protection 20%
Corrosion Prevention Methods 20%
Materials Selection & Design 10%
Professional Practice 5%
Key Topics Covered:
• Electrochemical principles
• Corrosion types (galvanic, pitting, crevice, stress corrosion cracking, hydrogen embrittlement)
• Cathodic protection (galvanic & impressed current)
• Coatings and linings
• Corrosion testing methods
• Water chemistry and treatment
• Material selection
• Failure analysis
, Page 2 of 147
Question 1
Which of the following is the most common type of corrosion?
A) Galvanic corrosion
B) Pitting corrosion
C) Uniform corrosion
D) Crevice corrosion
Correct Answer: C
Rationale: Uniform corrosion, also known as general corrosion, is the most common form of corrosion.
It occurs evenly over a metal surface, often resulting in thinning of the material. It is characterized by a
uniform loss of metal thickness across the exposed surface.
Question 2
The electrochemical potential of a metal is measured relative to which reference electrode?
A) Calomel electrode
B) Silver-silver chloride electrode
C) Standard hydrogen electrode (SHE)
D) Copper-copper sulfate electrode
, Page 3 of 147
Correct Answer: C
Rationale: The Standard Hydrogen Electrode (SHE) is the universal reference for measuring
electrochemical potentials. All standard electrode potentials are reported relative to the SHE, which is
assigned a potential of 0.000 V at all temperatures.
Question 3
What is the primary cause of cathodic disbondment in protective coatings?
A) Heat exposure
B) Mechanical impact
C) Alkaline conditions generated at cathodic sites
D) UV radiation
Correct Answer: C
Rationale: Cathodic disbondment occurs when the coating loses adhesion due to alkaline conditions
generated at cathodic sites during cathodic protection. The high pH can degrade the coating and cause it
to lose adhesion to the substrate.
Question 4
Cathodic protection prevents corrosion by making the structure a:
, Page 4 of 147
A) Cathode
B) Anode
C) Neutral electrode
D) Sacrificial electrode
Correct Answer: A
Rationale: Cathodic protection works by making the protected structure a cathode in an electrochemical
cell. This shifts the potential of the structure to a more negative value, preventing the anodic dissolution
reaction from occurring.
Question 5
The Nernst equation relates the electrode potential to which of the following?
A) Temperature only
B) Concentration of ions
C) pH only
D) Both temperature and concentration
Correct Answer: D
Rationale: The Nernst equation relates the electrode potential to both temperature and the
