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NACE 2 CBT Exam
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,Corrosion is established as a what kind of current?
Direct Current
All corrosion of iron at normal ambient conditions is ________________ ____________
an electrochemical process
Define, E=IR
E is driving voltage, I is current magnitude, R is circuit resistance.
The less noble part of a corrosion cell - negatively charged - dissolves metallic iron then
converts it to positively charged ions - generates electrons - where oxidation occurs.
Anode
The more noble region on the electrode - where electrons are consumed - positively
charged - where reduction occurs
Cathode
The difference in potentials between the anode and the cathode create what?
Voltage difference, which is the driving force for corrosion.
,Allows for electrons generated at the anode to transport to the cathode.
Return path (metallic pathway)
Conducts ionic current - water-based - contains ions - pathway to transport ions - carries
corrosion current
Electrolyte
Negatively charged ions
Anions
Positively charged ions
Cations
Four parts to a corrosion cell
Anode, Cathode, Return Path, Electrolyte
Oxygen_________the rate of corrosion
Increases
, Corrosion proceeds_________in warmer environments than in cooler ones
Faster
Chemical Salts like Sodium Chloride, act as a hygroscopic material (draws moisture
from the air), which___corrosivity in non immersed areas.
Increases
The wetter the environment, the__________corrosion is likely to occur
more
What are the two types of corrosion?
Localized and General
Corrosion that occurs in discrete sites on the metal surface - often occurs in areas difficult
to inspect
Localized
Corrosion that occurs relatively uniform over the entire surface
General
What type of corrosion can initiate at an open, freely exposed surface or at imperfections
in the coating?
Pitting Corrosion
NACE 2 CBT Exam
Questions Verified and
Provided with A+
Graded Answers |
Latest Updated 2026
,Corrosion is established as a what kind of current?
Direct Current
All corrosion of iron at normal ambient conditions is ________________ ____________
an electrochemical process
Define, E=IR
E is driving voltage, I is current magnitude, R is circuit resistance.
The less noble part of a corrosion cell - negatively charged - dissolves metallic iron then
converts it to positively charged ions - generates electrons - where oxidation occurs.
Anode
The more noble region on the electrode - where electrons are consumed - positively
charged - where reduction occurs
Cathode
The difference in potentials between the anode and the cathode create what?
Voltage difference, which is the driving force for corrosion.
,Allows for electrons generated at the anode to transport to the cathode.
Return path (metallic pathway)
Conducts ionic current - water-based - contains ions - pathway to transport ions - carries
corrosion current
Electrolyte
Negatively charged ions
Anions
Positively charged ions
Cations
Four parts to a corrosion cell
Anode, Cathode, Return Path, Electrolyte
Oxygen_________the rate of corrosion
Increases
, Corrosion proceeds_________in warmer environments than in cooler ones
Faster
Chemical Salts like Sodium Chloride, act as a hygroscopic material (draws moisture
from the air), which___corrosivity in non immersed areas.
Increases
The wetter the environment, the__________corrosion is likely to occur
more
What are the two types of corrosion?
Localized and General
Corrosion that occurs in discrete sites on the metal surface - often occurs in areas difficult
to inspect
Localized
Corrosion that occurs relatively uniform over the entire surface
General
What type of corrosion can initiate at an open, freely exposed surface or at imperfections
in the coating?
Pitting Corrosion
