Electrochemical techniques are often used for measuring corrosion rates of metals such as carbon
steel. They can provide rapid response and high sensitivity that make them useful for on-line corrosion
monitoring. However, electrochemical methods are only accurate if the anodic current derives primarily
from the corrosion process. The presence of electroactive species, either in solution or on the electrode
surface, will interfere with the electrochemical measurements and if interpreted as corrosion current will
lead the user to an erroneous conclusion of high corrosion rates.