AMPP Cathodic Protection
Specialist Level 1 (CP1)
Certification Exam
Questions with Answers| Guaranteed Pass| Latest
,1. Corrosion of metals is fundamentally best described as:
A. A purely mechanical wear process
B. An electrochemical process that returns a refined metal toward a more
stable, lower-energy compound
C. A process unrelated to electron flow
D. A phenomenon that only occurs in the presence of stray current
Answer: B
Rationale: Corrosion is an electrochemical reaction in which a metal oxidizes
and reverts toward a more thermodynamically stable compound (e.g., an
oxide), releasing electrons in the process.
2. In a basic corrosion cell, the electrode where oxidation (metal loss)
occurs is called the:
A. Cathode
B. Anode
C. Electrolyte
D. Reference electrode
Answer: B
Rationale: The anode is the site of oxidation in a corrosion cell, where metal
atoms lose electrons and go into solution as ions, resulting in metal loss.
3. In a basic corrosion cell, the electrode where reduction occurs and is
protected from metal loss is the:
A. Anode
B. Cathode
C. Rectifier
D. Coupon
Answer: B
Rationale: The cathode is the site of reduction in a corrosion cell; it does not
lose metal and is effectively the protected electrode.
,4. The four necessary components of a corrosion cell are the anode,
cathode, electrolyte, and:
A. A rectifier
B. A metallic path (electrical connection) between anode and cathode
C. A reference electrode
D. An insulating flange
Answer: B
Rationale: A complete corrosion cell requires an anode, a cathode, an
electrolyte, and a metallic (metallic conductor) path connecting the anode and
cathode to allow current flow.
5. An electrolyte in the context of corrosion is best defined as:
A. Any solid metal
B. A medium (such as soil or water) capable of conducting ionic current
C. A type of coating
D. A rectifier component
Answer: B
Rationale: An electrolyte is an ionically conductive medium, such as moist soil
or water, that allows current to flow between the anode and cathode of a
corrosion cell.
6. Current flow in the external (metallic) circuit of a corrosion cell moves
from the:
A. Cathode to the anode
B. Anode to the cathode
C. Electrolyte to the anode only
D. Cathode into the electrolyte
Answer: B
Rationale: In the metallic (external) circuit, conventional current flows from the
anode to the cathode; electrons flow in the opposite direction, from anode to
cathode as well, since electrons are released at the anode.
7. Which of the following is an example of a galvanic (dissimilar metal)
corrosion cell?
, A. Two identical steel coupons in the same soil
B. A steel pipe connected to a copper grounding rod in soil
C. A single piece of steel with uniform composition
D. A coated pipe with no exposed metal
Answer: B
Rationale: When two dissimilar metals with different natural potentials (such as
steel and copper) are electrically connected in a common electrolyte, a
galvanic cell forms, and the more active metal (steel) typically becomes the
anode.
8. The galvanic series ranks metals and alloys according to their:
A. Melting points
B. Relative nobility/tendency to corrode when coupled in a specific
electrolyte
C. Tensile strength
D. Cost per pound
Answer: B
Rationale: The galvanic series ranks metals by their relative activity (nobility) in
a given electrolyte (commonly seawater), helping predict which metal will act
as the anode when dissimilar metals are coupled.
9. Differential aeration corrosion cells commonly form when:
A. Oxygen concentration is uniform along a buried structure
B. Oxygen concentration differs between two areas of the same structure,
such as under a disbonded coating versus exposed soil
C. No electrolyte is present
D. The structure is fully coated with no holidays
Answer: B
Rationale: Areas with lower oxygen concentration (e.g., under disbonded
coating, deep soil) tend to become anodic relative to areas with higher oxygen
availability, driving a differential aeration corrosion cell.
10. Which factor generally increases the corrosivity of soil?
A. High soil resistivity
Specialist Level 1 (CP1)
Certification Exam
Questions with Answers| Guaranteed Pass| Latest
,1. Corrosion of metals is fundamentally best described as:
A. A purely mechanical wear process
B. An electrochemical process that returns a refined metal toward a more
stable, lower-energy compound
C. A process unrelated to electron flow
D. A phenomenon that only occurs in the presence of stray current
Answer: B
Rationale: Corrosion is an electrochemical reaction in which a metal oxidizes
and reverts toward a more thermodynamically stable compound (e.g., an
oxide), releasing electrons in the process.
2. In a basic corrosion cell, the electrode where oxidation (metal loss)
occurs is called the:
A. Cathode
B. Anode
C. Electrolyte
D. Reference electrode
Answer: B
Rationale: The anode is the site of oxidation in a corrosion cell, where metal
atoms lose electrons and go into solution as ions, resulting in metal loss.
3. In a basic corrosion cell, the electrode where reduction occurs and is
protected from metal loss is the:
A. Anode
B. Cathode
C. Rectifier
D. Coupon
Answer: B
Rationale: The cathode is the site of reduction in a corrosion cell; it does not
lose metal and is effectively the protected electrode.
,4. The four necessary components of a corrosion cell are the anode,
cathode, electrolyte, and:
A. A rectifier
B. A metallic path (electrical connection) between anode and cathode
C. A reference electrode
D. An insulating flange
Answer: B
Rationale: A complete corrosion cell requires an anode, a cathode, an
electrolyte, and a metallic (metallic conductor) path connecting the anode and
cathode to allow current flow.
5. An electrolyte in the context of corrosion is best defined as:
A. Any solid metal
B. A medium (such as soil or water) capable of conducting ionic current
C. A type of coating
D. A rectifier component
Answer: B
Rationale: An electrolyte is an ionically conductive medium, such as moist soil
or water, that allows current to flow between the anode and cathode of a
corrosion cell.
6. Current flow in the external (metallic) circuit of a corrosion cell moves
from the:
A. Cathode to the anode
B. Anode to the cathode
C. Electrolyte to the anode only
D. Cathode into the electrolyte
Answer: B
Rationale: In the metallic (external) circuit, conventional current flows from the
anode to the cathode; electrons flow in the opposite direction, from anode to
cathode as well, since electrons are released at the anode.
7. Which of the following is an example of a galvanic (dissimilar metal)
corrosion cell?
, A. Two identical steel coupons in the same soil
B. A steel pipe connected to a copper grounding rod in soil
C. A single piece of steel with uniform composition
D. A coated pipe with no exposed metal
Answer: B
Rationale: When two dissimilar metals with different natural potentials (such as
steel and copper) are electrically connected in a common electrolyte, a
galvanic cell forms, and the more active metal (steel) typically becomes the
anode.
8. The galvanic series ranks metals and alloys according to their:
A. Melting points
B. Relative nobility/tendency to corrode when coupled in a specific
electrolyte
C. Tensile strength
D. Cost per pound
Answer: B
Rationale: The galvanic series ranks metals by their relative activity (nobility) in
a given electrolyte (commonly seawater), helping predict which metal will act
as the anode when dissimilar metals are coupled.
9. Differential aeration corrosion cells commonly form when:
A. Oxygen concentration is uniform along a buried structure
B. Oxygen concentration differs between two areas of the same structure,
such as under a disbonded coating versus exposed soil
C. No electrolyte is present
D. The structure is fully coated with no holidays
Answer: B
Rationale: Areas with lower oxygen concentration (e.g., under disbonded
coating, deep soil) tend to become anodic relative to areas with higher oxygen
availability, driving a differential aeration corrosion cell.
10. Which factor generally increases the corrosivity of soil?
A. High soil resistivity
