CORROSION TECHNICIAN PRACTICE EXAM
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
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1. What is the primary cause of corrosion in metals?
A. Mechanical stress
B. Electrochemical reaction with the environment
C. High temperature only
D. Magnetic interference
Corrosion is mainly caused by electrochemical reactions between metal,
moisture, and oxygen.
2. Which metal is most resistant to corrosion?
A. Iron
B. Steel
C. Stainless steel
D. Cast iron
Stainless steel contains chromium, which forms a protective oxide layer.
3. What is galvanic corrosion?
A. Corrosion due to heat
B. Corrosion between two dissimilar metals in contact
,C. Corrosion caused by bacteria
D. Corrosion due to paint failure
Galvanic corrosion occurs when two different metals create an
electrochemical cell.
4. Which factor increases corrosion rate most?
A. Dry air
B. Low humidity
C. High moisture and oxygen levels
D. Vacuum conditions
Moist environments accelerate electrochemical reactions.
5. What is the purpose of cathodic protection?
A. Increase metal strength
B. Prevent corrosion by making metal a cathode
C. Increase temperature resistance
D. Harden the surface
Cathodic protection reduces oxidation by redirecting corrosion to a
sacrificial anode.
6. Which is a sacrificial anode material?
A. Copper
B. Stainless steel
C. Zinc
, D. Aluminum oxide
Zinc corrodes preferentially to protect the base metal.
7. What is pitting corrosion?
A. Uniform surface corrosion
B. Localized small holes or pits in metal
C. Corrosion due to stress
D. Surface discoloration only
Pitting is highly localized and dangerous because it penetrates deeply.
8. What does corrosion inhibitor do?
A. Increases rust
B. Slows or prevents corrosion reactions
C. Changes metal color
D. Hardens metal surface
Inhibitors reduce electrochemical activity.
9. What is the main component of rust?
A. Aluminum oxide
B. Zinc oxide
C. Iron oxide
D. Copper sulfate
Rust is iron reacting with oxygen and water.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary cause of corrosion in metals?
A. Mechanical stress
B. Electrochemical reaction with the environment
C. High temperature only
D. Magnetic interference
Corrosion is mainly caused by electrochemical reactions between metal,
moisture, and oxygen.
2. Which metal is most resistant to corrosion?
A. Iron
B. Steel
C. Stainless steel
D. Cast iron
Stainless steel contains chromium, which forms a protective oxide layer.
3. What is galvanic corrosion?
A. Corrosion due to heat
B. Corrosion between two dissimilar metals in contact
,C. Corrosion caused by bacteria
D. Corrosion due to paint failure
Galvanic corrosion occurs when two different metals create an
electrochemical cell.
4. Which factor increases corrosion rate most?
A. Dry air
B. Low humidity
C. High moisture and oxygen levels
D. Vacuum conditions
Moist environments accelerate electrochemical reactions.
5. What is the purpose of cathodic protection?
A. Increase metal strength
B. Prevent corrosion by making metal a cathode
C. Increase temperature resistance
D. Harden the surface
Cathodic protection reduces oxidation by redirecting corrosion to a
sacrificial anode.
6. Which is a sacrificial anode material?
A. Copper
B. Stainless steel
C. Zinc
, D. Aluminum oxide
Zinc corrodes preferentially to protect the base metal.
7. What is pitting corrosion?
A. Uniform surface corrosion
B. Localized small holes or pits in metal
C. Corrosion due to stress
D. Surface discoloration only
Pitting is highly localized and dangerous because it penetrates deeply.
8. What does corrosion inhibitor do?
A. Increases rust
B. Slows or prevents corrosion reactions
C. Changes metal color
D. Hardens metal surface
Inhibitors reduce electrochemical activity.
9. What is the main component of rust?
A. Aluminum oxide
B. Zinc oxide
C. Iron oxide
D. Copper sulfate
Rust is iron reacting with oxygen and water.
