NACE Corrosion Monitoring Techniques 2

Question 1

Electrochemical Noise (EN) monitoring detects corrosion by measuring:

Accepted Answer

Spontaneous fluctuations in potential and current that reveal corrosion mechanisms

Answer

EN monitoring captures natural, low-level fluctuations in electrochemical potential and current that serve as fingerprints for corrosion mechanisms including pitting and stress corrosion cracking.

Question 2

A Zero Resistance Ammeter (ZRA) is used in corrosion monitoring to measure:

Accepted Answer

Galvanic current flowing between two dissimilar metals coupled together

Answer

A ZRA measures the galvanic current between two coupled metal electrodes while maintaining zero resistance in the coupling circuit, accurately simulating real galvanic couple behavior.

Question 3

The Field Signature Method (FSM) monitors corrosion by:

Accepted Answer

Mapping wall thickness changes using an array of pin electrodes that measure resistance patterns across a pipe section

Answer

FSM uses an array of pins welded to the pipe and measures electrical resistance patterns between them, creating a 'signature' that reveals localized wall thickness changes and corrosion distribution.

Question 4

What is the main advantage of online corrosion monitoring over offline inspection methods?

Accepted Answer

Online monitoring provides continuous data without removing equipment from service

Answer

Online monitoring enables continuous, real-time data collection while the system remains in service, allowing early detection of corrosion upsets and trend analysis without production interruption.

Question 5

When calculating corrosion rate from a corrosion coupon, which piece of data is NOT required for the standard calculation?

Accepted Answer

Ambient temperature during the exposure period

Answer

The standard coupon corrosion rate formula uses mass loss, surface area, metal density, and exposure time; ambient temperature affects corrosion but is not a variable in the rate calculation equation itself.

NACE - National Association of Corrosion Engineers Certification Practice Test

NACE - National Association of Corrosion Engineers Certification Practice Test

NACE Corrosion Monitoring Techniques 2