Corrosion Technologist Certification Exam
1. Corrosion is best defined as:
A. Metal oxidation in air only
B. Deterioration of a material due to chemical or
electrochemical reaction with the environment
C. Mechanical wear of a surface
D. Failure of coating due to UV exposure
Answer: B
Explanation: Corrosion involves
chemical/electrochemical interaction between metal
and environment.
2. In a corrosion cell, the anode is the point where:
A. Reduction occurs
B. Metal dissolves (oxidation)
C. No reaction occurs
D. Metal gains electrons
Answer: B
Explanation: At the anode, metal atoms lose electrons
(oxidation), causing dissolution.
,3. The cathodic reaction in neutral aerated water is
typically:
A. Hydrogen evolution
B. Oxygen reduction
C. Metal dissolution
D. Carbonate formation
Answer: B
Explanation: Oxygen reduction is the main cathodic
reaction in neutral solutions.
4. A galvanic series ranks metals according to their:
A. Density
B. Melting point
C. Electrode potential in a specific electrolyte
D. Conductivity
Answer: C
Explanation: The galvanic series lists metals from most
active to most noble in a specific environment.
5. The most common form of corrosion is:
A. MIC
B. Uniform corrosion
,C. Crevice corrosion
D. SCC
Answer: B
Explanation: Uniform corrosion affects the entire
surface evenly.
6. Pitting corrosion is typically:
A. Shallow and uniform
B. Deep and localized
C. Only caused by bacteria
D. Only occurs at high temperature
Answer: B
Explanation: Pitting forms deep, localized cavities.
7. A corrosion inhibitor works by:
A. Increasing metal hardness
B. Reducing the corrosion reaction at anode, cathode,
or both
C. Removing oxygen
D. Thickening metal
Answer: B
Explanation: Inhibitors slow anodic or cathodic
reactions.
, 8. The main driver of galvanic corrosion is:
A. Oxygen content
B. Contact of dissimilar metals in an electrolyte
C. Metal thickness
D. Soil color
Answer: B
Explanation: Galvanic corrosion requires two dissimilar
metals electrically connected in an electrolyte.
9. Crevice corrosion typically forms:
A. On open flat surfaces
B. Under gaskets, deposits, and lap joints
C. Only on stainless steels
D. Only in soil
Answer: B
Explanation: Crevice corrosion occurs in shielded,
oxygen-depleted areas.
10. The primary cause of MIC is:
A. Lack of oxygen
B. Microorganisms producing corrosion-enhancing
byproducts
1. Corrosion is best defined as:
A. Metal oxidation in air only
B. Deterioration of a material due to chemical or
electrochemical reaction with the environment
C. Mechanical wear of a surface
D. Failure of coating due to UV exposure
Answer: B
Explanation: Corrosion involves
chemical/electrochemical interaction between metal
and environment.
2. In a corrosion cell, the anode is the point where:
A. Reduction occurs
B. Metal dissolves (oxidation)
C. No reaction occurs
D. Metal gains electrons
Answer: B
Explanation: At the anode, metal atoms lose electrons
(oxidation), causing dissolution.
,3. The cathodic reaction in neutral aerated water is
typically:
A. Hydrogen evolution
B. Oxygen reduction
C. Metal dissolution
D. Carbonate formation
Answer: B
Explanation: Oxygen reduction is the main cathodic
reaction in neutral solutions.
4. A galvanic series ranks metals according to their:
A. Density
B. Melting point
C. Electrode potential in a specific electrolyte
D. Conductivity
Answer: C
Explanation: The galvanic series lists metals from most
active to most noble in a specific environment.
5. The most common form of corrosion is:
A. MIC
B. Uniform corrosion
,C. Crevice corrosion
D. SCC
Answer: B
Explanation: Uniform corrosion affects the entire
surface evenly.
6. Pitting corrosion is typically:
A. Shallow and uniform
B. Deep and localized
C. Only caused by bacteria
D. Only occurs at high temperature
Answer: B
Explanation: Pitting forms deep, localized cavities.
7. A corrosion inhibitor works by:
A. Increasing metal hardness
B. Reducing the corrosion reaction at anode, cathode,
or both
C. Removing oxygen
D. Thickening metal
Answer: B
Explanation: Inhibitors slow anodic or cathodic
reactions.
, 8. The main driver of galvanic corrosion is:
A. Oxygen content
B. Contact of dissimilar metals in an electrolyte
C. Metal thickness
D. Soil color
Answer: B
Explanation: Galvanic corrosion requires two dissimilar
metals electrically connected in an electrolyte.
9. Crevice corrosion typically forms:
A. On open flat surfaces
B. Under gaskets, deposits, and lap joints
C. Only on stainless steels
D. Only in soil
Answer: B
Explanation: Crevice corrosion occurs in shielded,
oxygen-depleted areas.
10. The primary cause of MIC is:
A. Lack of oxygen
B. Microorganisms producing corrosion-enhancing
byproducts
