Oil and gas buried pipeline are usually protected by a thick organic coating and supported by a cathodic protection system. The protection process allows the pipe line protection against corrosion; however, corrosion is taken place in the cracks and holes of insulation coating due to pipelines adjacency to electromagnetic fields. The process is called AC corrosion affected by some parameters such as AC induced amplitude, cathodic current protection and soil type. This corrosion was theoretically and practically studied by using carbon steel pieces. In addition, a solution stimulating the soil where the pipelines are buried was used. This phenomenon was studied through several experiments. Corrosion compounds were also analyzed. The results revealed a significant effect of AC induced amplitude and soil resistance. It has been also shown that 50 Hz frequency can be very quick in comparison with corrosion occurrence time at each positive or negative AC current phase.