The influence of corrosive environment on the correlation of cathode protection current and limit diffusion current for the X70 pipe steel - L. I. Nyrkova; S. O. Osadchuk; A. V. Klymenko; A. O. Rybakov; S. L. Melnychuk; S. M. Prokopchuk (Materials Science (Physicochemical mechanics of materials), 2020)