NACE CP2 LATEST 2026 EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔____ movement results in a ____ in polarization and a(n) _____ in current
A) decreased, decrease, decrease
B) decreased, increase, decrease
C) increased, increase, decrease
D) increased, decrease, decrease
E) increased, increase, increase - ✔✔d
✔✔A(n) _____ in the metal ion concentration of the anode metal results in a(n) ____ in
polarization of the anode and a(n) ____ in current
A) increase, decrease, decrease
B) decrease, decrease, decrease
C) decrease, increase, decrease
D) increase, increase, decrease
E) decrease, decrease, increase - ✔✔e
✔✔Polarization of the cathode can be affected by the concentration of cathodic
reactants, such as _____ or _____ ions
A) CO2, OH-
B) oxygen, OH-
C) carbon, OH-
D) oxygen, hydrogen - ✔✔d
✔✔In regards to cathodic reactants, a(n) _____ in the concentration of either of the
reactants of oxygen or hydrogen will _____ polarization of the cathode and _____
current and vice versa
A) increase, decrease, decrease
B) decrease, decrease, decrease
C) increase, decrease, increase
D) increase, increase, decrease
E) decrease, decrease, increase - ✔✔c
✔✔Passivity can be defined as the
A) gain of chemical reactivity
B) polarization of chemical reactivity
C) loss of chemical reactivity
D) depolarization of molecular reactivity
,E) polarization of molecular reactivity - ✔✔c
✔✔The ____ region is when a slight increase in corrosion potential causes the
corrosion current to increase
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔d
✔✔The ____ region is when the corrosion potential increases to a certain point,
however, the corrosion current suddenly decreases and remain essentially constant
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔b
✔✔The ____ region occurs if the potential is increased sufficiently thus current again
increases
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔a
✔✔For the active (or nonpassivating) metal, as corrosion potential _____,
corrosion current ____, more or less logarithmically (or linearly on a semi-
log graph).
A) increases, increases
B) decreases, decreases
C) increases, decreases
D) decreases, increases - ✔✔a
✔✔This type of film which forms naturally on most metals when they are exposed to the
air, can provide substantial protection against further attack by many environments
A) ore
B) oxide
C) reductant
D) selimum - ✔✔b
✔✔Type of corrosion with an even loss of metal over the entire area or a large area of
the structure
,A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔g
✔✔This type of corrosion occurs where two tightly spaced
surfaces - either two metals or a metal and nonmetal - are exposed to a
corroding environment. Holes, gasket surfaces, lap joints, surface deposits, and
crevices are likely places for this type of corrosion.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔f
✔✔This corrosion occurs when two dissimilar metals are
connected. The potential of the two metals creates a voltage difference, the driving
force for corrosion.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔a
✔✔Localized corrosion that occurs over a small area of the metal surface and leaves
holes in the surface.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔e
, ✔✔This is a local corrosion attack at the grain boundaries
of an alloy. It is caused by a difference in element composition near the
boundaries, compared to the rest of the alloy.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔b
✔✔This type of corrosion involves the certain removal of
one of the elements from an alloy.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔c
✔✔This corrosion is associated with rapid movement of a
corrosive fluid over a metal, removing corrosion products.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔d
✔✔results from the reaction of
the metal with a corrosive environment and the presence of a stress
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) environmental cracking
F) crevice corrosion
G) uniform attack - ✔✔d
SOLUTIONS RATED A+
✔✔____ movement results in a ____ in polarization and a(n) _____ in current
A) decreased, decrease, decrease
B) decreased, increase, decrease
C) increased, increase, decrease
D) increased, decrease, decrease
E) increased, increase, increase - ✔✔d
✔✔A(n) _____ in the metal ion concentration of the anode metal results in a(n) ____ in
polarization of the anode and a(n) ____ in current
A) increase, decrease, decrease
B) decrease, decrease, decrease
C) decrease, increase, decrease
D) increase, increase, decrease
E) decrease, decrease, increase - ✔✔e
✔✔Polarization of the cathode can be affected by the concentration of cathodic
reactants, such as _____ or _____ ions
A) CO2, OH-
B) oxygen, OH-
C) carbon, OH-
D) oxygen, hydrogen - ✔✔d
✔✔In regards to cathodic reactants, a(n) _____ in the concentration of either of the
reactants of oxygen or hydrogen will _____ polarization of the cathode and _____
current and vice versa
A) increase, decrease, decrease
B) decrease, decrease, decrease
C) increase, decrease, increase
D) increase, increase, decrease
E) decrease, decrease, increase - ✔✔c
✔✔Passivity can be defined as the
A) gain of chemical reactivity
B) polarization of chemical reactivity
C) loss of chemical reactivity
D) depolarization of molecular reactivity
,E) polarization of molecular reactivity - ✔✔c
✔✔The ____ region is when a slight increase in corrosion potential causes the
corrosion current to increase
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔d
✔✔The ____ region is when the corrosion potential increases to a certain point,
however, the corrosion current suddenly decreases and remain essentially constant
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔b
✔✔The ____ region occurs if the potential is increased sufficiently thus current again
increases
A) transpassive
B) passive
C) nonpassive
D) active - ✔✔a
✔✔For the active (or nonpassivating) metal, as corrosion potential _____,
corrosion current ____, more or less logarithmically (or linearly on a semi-
log graph).
A) increases, increases
B) decreases, decreases
C) increases, decreases
D) decreases, increases - ✔✔a
✔✔This type of film which forms naturally on most metals when they are exposed to the
air, can provide substantial protection against further attack by many environments
A) ore
B) oxide
C) reductant
D) selimum - ✔✔b
✔✔Type of corrosion with an even loss of metal over the entire area or a large area of
the structure
,A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔g
✔✔This type of corrosion occurs where two tightly spaced
surfaces - either two metals or a metal and nonmetal - are exposed to a
corroding environment. Holes, gasket surfaces, lap joints, surface deposits, and
crevices are likely places for this type of corrosion.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔f
✔✔This corrosion occurs when two dissimilar metals are
connected. The potential of the two metals creates a voltage difference, the driving
force for corrosion.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔a
✔✔Localized corrosion that occurs over a small area of the metal surface and leaves
holes in the surface.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔e
, ✔✔This is a local corrosion attack at the grain boundaries
of an alloy. It is caused by a difference in element composition near the
boundaries, compared to the rest of the alloy.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔b
✔✔This type of corrosion involves the certain removal of
one of the elements from an alloy.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔c
✔✔This corrosion is associated with rapid movement of a
corrosive fluid over a metal, removing corrosion products.
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) pitting
F) crevice corrosion
G) uniform attack - ✔✔d
✔✔results from the reaction of
the metal with a corrosive environment and the presence of a stress
A) Galvanic attack
B) intergranular attack
C) selective leaching
D) velocity phenomena
E) environmental cracking
F) crevice corrosion
G) uniform attack - ✔✔d
