NACE CP2 LATEST EXAM PREP QUESTIONS
AND ANSWERS PDF 2026
▶ small anode to large cathode ratio. Answer: higher corrosion penetration
rate
▶ large anode to small cathode ratio. Answer: lower corrosion penetration
rate
▶ 4 elements of a corrosion cell. Answer: Anode
Cathode
Metallic Patch
Electrolyte
▶ Faraday's law calculates. Answer: metal lost due to current over time
▶ the stability of a copper-copper sulfate reference electrode does not vary
with. Answer: a saturated solution of the copper ions.
▶ if a digital meter displays a negative value while measure a voltage
across a resistor, it indicates. Answer:
▶ Which of the following are depolarizers?
i.Dissolved oxygen
ii. increased electrolyte velocity
iii. bacteria action
iv. current pickup on the metal. Answer: i, ii, iii only
▶ polarization occurs
a. at the anode surface only
b. at the cathode surface only
c. at the anode and cathode surfaces
d. in the metallic path. Answer: C. at the anode and cathode surfaces
,▶ Which of the following factors affect polarization?
a. current
b. ion concentration
c. anode/cathode ratio
d. temperature. Answer: All of the above
▶ Which of the following are types of polarization?
i. concentration
ii. activation
iii. temperature
iv. velocity. Answer: i and ii
▶ The measure of the electrochemical difference between two metals in an
electrolyte is which of the following?
a. amps
b. volts
c. ohms
d siemans. Answer: b. volts
▶ the relationship between current and polarization is described by which
of the following?
i. Corrosion cell current decreases with increased polarization.
ii. polarization increases with increased current.
iii. current increases with increased polarization
iv. polarization decreases with increased current. Answer: i and ii only
▶ a passivating material will exhibit which of the following properties?
i. does not corrode at all
ii. corrosion increases as current increases initially
iii. corrosion current decreases after a certain point.
, iv. corrosion current increases beyond the passive region. Answer: ii, iii,
and iv only
▶ In a standard emf series of metals, which of the following is represented?
a. the potential of a metal is measured in a saturated solution of copper-
sulfate
b. current is measured between the most noble and most active metals.
c. the potential is measured with respect to a standard hydrogen electrode.
d. the total number of electrons is determined.. Answer: c. the potential is
measured with respect to a standard hydrogen electrode
▶ if two different metals are connected together in an electrolyte, the metal
with the
a. most negative potential is the cathode
b. most positive potential is the cathode
c. positive potential will corrode
d. highest valence is the anode.. Answer: b. the most positive potential is
the cathode
▶ in a practical galvanic series of metals, which of the following is
represented?
a. the potential between two different metals in the series is measured.
b. the current is measured between two of the metals in the series.
c. the electrolyte contains metal ions of that metal.
d. the potential of metals in a common electrolyte. Answer: d. the potential
of metals in a common electrolyte
▶ the nernst equation. Answer: calculates the potential of a metal in
solutions of different metal ion concentrations
▶ a corrosion cell can form under which of the following conditions?
AND ANSWERS PDF 2026
▶ small anode to large cathode ratio. Answer: higher corrosion penetration
rate
▶ large anode to small cathode ratio. Answer: lower corrosion penetration
rate
▶ 4 elements of a corrosion cell. Answer: Anode
Cathode
Metallic Patch
Electrolyte
▶ Faraday's law calculates. Answer: metal lost due to current over time
▶ the stability of a copper-copper sulfate reference electrode does not vary
with. Answer: a saturated solution of the copper ions.
▶ if a digital meter displays a negative value while measure a voltage
across a resistor, it indicates. Answer:
▶ Which of the following are depolarizers?
i.Dissolved oxygen
ii. increased electrolyte velocity
iii. bacteria action
iv. current pickup on the metal. Answer: i, ii, iii only
▶ polarization occurs
a. at the anode surface only
b. at the cathode surface only
c. at the anode and cathode surfaces
d. in the metallic path. Answer: C. at the anode and cathode surfaces
,▶ Which of the following factors affect polarization?
a. current
b. ion concentration
c. anode/cathode ratio
d. temperature. Answer: All of the above
▶ Which of the following are types of polarization?
i. concentration
ii. activation
iii. temperature
iv. velocity. Answer: i and ii
▶ The measure of the electrochemical difference between two metals in an
electrolyte is which of the following?
a. amps
b. volts
c. ohms
d siemans. Answer: b. volts
▶ the relationship between current and polarization is described by which
of the following?
i. Corrosion cell current decreases with increased polarization.
ii. polarization increases with increased current.
iii. current increases with increased polarization
iv. polarization decreases with increased current. Answer: i and ii only
▶ a passivating material will exhibit which of the following properties?
i. does not corrode at all
ii. corrosion increases as current increases initially
iii. corrosion current decreases after a certain point.
, iv. corrosion current increases beyond the passive region. Answer: ii, iii,
and iv only
▶ In a standard emf series of metals, which of the following is represented?
a. the potential of a metal is measured in a saturated solution of copper-
sulfate
b. current is measured between the most noble and most active metals.
c. the potential is measured with respect to a standard hydrogen electrode.
d. the total number of electrons is determined.. Answer: c. the potential is
measured with respect to a standard hydrogen electrode
▶ if two different metals are connected together in an electrolyte, the metal
with the
a. most negative potential is the cathode
b. most positive potential is the cathode
c. positive potential will corrode
d. highest valence is the anode.. Answer: b. the most positive potential is
the cathode
▶ in a practical galvanic series of metals, which of the following is
represented?
a. the potential between two different metals in the series is measured.
b. the current is measured between two of the metals in the series.
c. the electrolyte contains metal ions of that metal.
d. the potential of metals in a common electrolyte. Answer: d. the potential
of metals in a common electrolyte
▶ the nernst equation. Answer: calculates the potential of a metal in
solutions of different metal ion concentrations
▶ a corrosion cell can form under which of the following conditions?
