Exam (elaborations) Senior Corrosion Technologist

Senior Corrosion Technologist Certification Exam


1. Corrosion can be defined as:
A. Mechanical wear caused by friction
B. Deterioration of a material due to chemical or
electrochemical reaction
C. Breakdown of metal due to thermal shock
D. Damage caused solely by microorganisms
Answer: B
Explanation: Corrosion is primarily a chemical or
electrochemical reaction between a material and its
environment.


2. Which of the following is an example of electrochemical
corrosion?
A. Thermal oxidation
B. Stress cracking due to fatigue
C. Rusting of carbon steel in water
D. Creep deformation
Answer: C
Explanation: Rusting occurs through an electrochemical
mechanism involving anodic and cathodic reactions.


3. In the corrosion cell, the region where oxidation occurs is
the:

,A. Cathode
B. Anode
C. Neutral zone
D. Passive region
Answer: B
Explanation: Oxidation (metal dissolution) happens at the
anode.


4. Which factor has the most significant influence on
corrosion rate?
A. Metal color
B. Environmental moisture
C. Weight of metal
D. Metal density
Answer: B
Explanation: Presence of moisture is essential for
electrochemical corrosion processes.


5. High chloride concentration primarily increases the risk of:
A. Uniform corrosion
B. Pitting corrosion
C. Fretting corrosion
D. Intergranular corrosion
Answer: B
Explanation: Chlorides break down passive films, promoting
pitting, especially on stainless steels.

,6. Which of the following metals is most active in the galvanic
series?
A. Stainless steel
B. Copper
C. Titanium
D. Magnesium
Answer: D
Explanation: Magnesium is highly active (most anodic),
corroding preferentially.


7. Galvanic corrosion occurs when:
A. Two similar metals are in contact
B. Two dissimilar metals are electrically connected in an
electrolyte
C. Metal is heated rapidly
D. Metal is exposed to dry air
Answer: B
Explanation: Galvanic corrosion needs dissimilar metals,
electrical connection, and an electrolyte.


8. The primary product of steel corrosion in atmospheric
environments is:
A. Copper oxide
B. Zinc carbonate

, C. Iron oxide (rust)
D. Aluminum hydroxide
Answer: C
Explanation: Iron oxide forms through electrochemical
oxidation of steel.


9. Soil resistivity affects buried corrosion because:
A. Low resistivity reduces corrosion current
B. High resistivity increases corrosion rate
C. Low resistivity increases corrosion activity
D. Resistivity has no effect
Answer: C
Explanation: Low-resistivity soils allow higher ionic
movement and higher corrosion rates.


10. Which test best evaluates soil corrosivity?
A. Hardness test
B. Resistivity measurement
C. Charpy impact test
D. Radiography
Answer: B
Explanation: Soil resistivity is the most useful indicator of
corrosivity.


11. The main function of cathodic protection is to: