AC Corrosion Mapping is a technique used to locate and map corrosion on the surface of pipelines

It uses the principles of Alternating Current (AC) technology to detect the presence of corrosion. In this technique, a low-frequency AC signal is applied to the pipeline, and the electrical resistance along the pipeline surface is measured. The corrosion on the pipeline surface decreases the electrical resistance of the metal, and thus results in a change in the electrical signal. The electrical signal changes are then used to create a map of the corrosion on the pipeline. This map provides a visual representation of the corrosion, which helps pipeline operators to identify the location and extent of the corrosion. AC Corrosion Mapping is a non-invasive and efficient method of detecting and mapping corrosion on pipelines, and it provides important information for determining the remaining life of the pipeline and planning maintenance and repair work.