NACE 1 EXAM 2025/2026 QUESTIONS
AND ANSWERS 100% PASS
Anode - ANS The electrode of an electrochemical cell at which oxidation occurs?
Anode - ANS Electrons flow away from the ______ in the external circuit.
Anode - ANS Corrosion usually occurs and metal ions enter the solution at the ______?
Cathode - ANS The electrode of an electrochemical cell at which reduction is the principal
reaction?
Cathode - ANS Electrons flow towards the ______ of an electrochemical cell.
Cathodic Protection - ANS A technique to reduce the corrosion of a metal surface by making
that surface the cathode of an electrochemical cell.
Corrosion - ANS The deterioration of a material, usually a metal, that results from a reaction
with the environment.
Corrosion Cell - ANS In order for corrosion to occur, certain conditions and elements are
essential. This combination of an anode, cathode, return path and electrolyte.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Crevice Corrosion - ANS Localized corrosion of a metal surface at, or immediately adjacent to,
an area that is shielded from full exposure to the environment because of close proximity of the
metal surface of another material.
Corrosion Inhibitor - ANS A chemical substance or combination of substances that, when
present in the environment, prevents or reduces corrosion.
Electrolyte - ANS A chemical substance containing ions that migrate in the electric field.
Galvanic Series - ANS A list of metals and alloys arranged according to their corrosion
potentials in a given environment.
Generalized Corrosion - ANS Corrosion that is distributed more or less uniformly over the
surface of a material.
Localized Corrosion - ANS This occurs at discrete sites on the metal surface.
Mill Scale - ANS The oxide layer formed during hot fabrication or heat treatment of metals.
Passivation - ANS A reduction of the anodic reaction rate of an electrode involved in
corrosion.
Pitting Corrosion - ANS Localized corrosion of a metal surface that is confined to a small area
and takes the form of cavities called pits.
Return Path (Metallic Pathway) - ANS This connects the anode and cathode, allowing passage
of electrons, generated at the anode, to the cathode.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,1 - 2 - Define Corrosion: - ANS The deterioration of a material, usually a metal, that results
from a reaction with the environment.
1 - 2 - What are the elements of a corrosion cell? - ANS This combination of an anode,
cathode, return path and electrolyte.
1 - 2 - Describe what happens at the anode - ANS The part that corrodes, dissolves in
electrolytes, dissolves in the form of positively charges ions, electrons generated are conducted
to the cathode
1 - 2 - What is the function of the electrolyte? - ANS to conduct ionic current, closes the loop
in the corrosion cell,
1 - 2 - What is the function of the metallic pathway? - ANS to connect the anode to the
cathode and allow passage of electrons.
1 - 2 - What is the galvanic series? - ANS a list of materials in order of their corrosion
potentials, with the most easily corroded, or most active, at the top and the least active or
corroded at the bottom.
1 - 2 - What is passivation? - ANS ...The formation of a protective oxide film on the surface
reducing its chemical activity and its ability to corrode.
1 - 2 - The general rules of galvanic corrosion are? - ANS - When dissimilar metals are
connected, the most active (or anodic) metals corrodes more rapidly, while the more noble
metal is better protected and corrodes less rapidly.
- As the potential difference between these two dissimilar metals increases, the rate of galvanic
corrosion increases.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, - Corrosion rates increase as potential differences between metals increase.
1 - 2 - Name at least 5 factors that effect the rate of corrosion. - ANS Oxygen, temperature,
chemical salts, humidity and pollutants and acid gases.
1 - 2 - General corrosion is: - ANS A uniform loss of material over the entire surface, easy to
inspect and does not cause catastrophic failures.
1 - 2 - Localized corrosion is: - ANS discrete sites on the metal surface, pitting abd crevice,
difficult to inspect. Can cause major catastrophic occurrences.
1 - 2 - List some of the common tools/methods used for corrosion control. - ANS - Design
- Inhibitors
- Material Selection
- Cathodic Protection
- Protective Coatings
- Splash Zone Systems
- Alteration of the environment
Coatings Specifications - ANS A formal, structured document containing information on a
project (such as scope, terms, schedule, inspection, etc.)
Instrument Calibration History Reports - ANS Reports that normally contain information on
how frequently each instrument is to be or has been calibrated.
Materials Inventory Reports - ANS Reports that normally contain information on the
inventory of jobsite materials, and are normally submitted periodically.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
AND ANSWERS 100% PASS
Anode - ANS The electrode of an electrochemical cell at which oxidation occurs?
Anode - ANS Electrons flow away from the ______ in the external circuit.
Anode - ANS Corrosion usually occurs and metal ions enter the solution at the ______?
Cathode - ANS The electrode of an electrochemical cell at which reduction is the principal
reaction?
Cathode - ANS Electrons flow towards the ______ of an electrochemical cell.
Cathodic Protection - ANS A technique to reduce the corrosion of a metal surface by making
that surface the cathode of an electrochemical cell.
Corrosion - ANS The deterioration of a material, usually a metal, that results from a reaction
with the environment.
Corrosion Cell - ANS In order for corrosion to occur, certain conditions and elements are
essential. This combination of an anode, cathode, return path and electrolyte.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Crevice Corrosion - ANS Localized corrosion of a metal surface at, or immediately adjacent to,
an area that is shielded from full exposure to the environment because of close proximity of the
metal surface of another material.
Corrosion Inhibitor - ANS A chemical substance or combination of substances that, when
present in the environment, prevents or reduces corrosion.
Electrolyte - ANS A chemical substance containing ions that migrate in the electric field.
Galvanic Series - ANS A list of metals and alloys arranged according to their corrosion
potentials in a given environment.
Generalized Corrosion - ANS Corrosion that is distributed more or less uniformly over the
surface of a material.
Localized Corrosion - ANS This occurs at discrete sites on the metal surface.
Mill Scale - ANS The oxide layer formed during hot fabrication or heat treatment of metals.
Passivation - ANS A reduction of the anodic reaction rate of an electrode involved in
corrosion.
Pitting Corrosion - ANS Localized corrosion of a metal surface that is confined to a small area
and takes the form of cavities called pits.
Return Path (Metallic Pathway) - ANS This connects the anode and cathode, allowing passage
of electrons, generated at the anode, to the cathode.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,1 - 2 - Define Corrosion: - ANS The deterioration of a material, usually a metal, that results
from a reaction with the environment.
1 - 2 - What are the elements of a corrosion cell? - ANS This combination of an anode,
cathode, return path and electrolyte.
1 - 2 - Describe what happens at the anode - ANS The part that corrodes, dissolves in
electrolytes, dissolves in the form of positively charges ions, electrons generated are conducted
to the cathode
1 - 2 - What is the function of the electrolyte? - ANS to conduct ionic current, closes the loop
in the corrosion cell,
1 - 2 - What is the function of the metallic pathway? - ANS to connect the anode to the
cathode and allow passage of electrons.
1 - 2 - What is the galvanic series? - ANS a list of materials in order of their corrosion
potentials, with the most easily corroded, or most active, at the top and the least active or
corroded at the bottom.
1 - 2 - What is passivation? - ANS ...The formation of a protective oxide film on the surface
reducing its chemical activity and its ability to corrode.
1 - 2 - The general rules of galvanic corrosion are? - ANS - When dissimilar metals are
connected, the most active (or anodic) metals corrodes more rapidly, while the more noble
metal is better protected and corrodes less rapidly.
- As the potential difference between these two dissimilar metals increases, the rate of galvanic
corrosion increases.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, - Corrosion rates increase as potential differences between metals increase.
1 - 2 - Name at least 5 factors that effect the rate of corrosion. - ANS Oxygen, temperature,
chemical salts, humidity and pollutants and acid gases.
1 - 2 - General corrosion is: - ANS A uniform loss of material over the entire surface, easy to
inspect and does not cause catastrophic failures.
1 - 2 - Localized corrosion is: - ANS discrete sites on the metal surface, pitting abd crevice,
difficult to inspect. Can cause major catastrophic occurrences.
1 - 2 - List some of the common tools/methods used for corrosion control. - ANS - Design
- Inhibitors
- Material Selection
- Cathodic Protection
- Protective Coatings
- Splash Zone Systems
- Alteration of the environment
Coatings Specifications - ANS A formal, structured document containing information on a
project (such as scope, terms, schedule, inspection, etc.)
Instrument Calibration History Reports - ANS Reports that normally contain information on
how frequently each instrument is to be or has been calibrated.
Materials Inventory Reports - ANS Reports that normally contain information on the
inventory of jobsite materials, and are normally submitted periodically.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
