What does the term 'stray current' refer to in corrosion measurement?

The term 'stray current' refers to current flowing through unintentional paths. This phenomenon typically occurs when electrical currents take routes other than the intended ones, often through the surrounding environment, such as soil or water. In the context of corrosion measurement, stray current can initiate or accelerate corrosion processes, particularly when it interacts with metallic structures or pipelines that are in contact with these unintended paths.

This unwanted flow of current can result from power lines, rail systems, or other electrical infrastructure, and its effects can be monitored to assess the potential risks to metallic components. Recognizing and mitigating the effects of stray currents is essential in cathodic protection systems to enhance their effectiveness and prolong the life of the assets being protected.