FIELD: technological processes.
SUBSTANCE: invention relates to field of underground metal structures protection against electrochemical corrosion. Method involves following operations: connecting additional sources of direct current on protected section in electrical safety installation electric circuit with drainage points on underground structure by means of cable from each additional direct current source creating protection zones from each additional direct current source, determining effective protection zone by induced negative potential value from minus 0.90 V up to minus 2.50 V from additional direct current source connection point to point on protected structure, in which structure longitudinal resistance will be equal to “structure-to-ground” transitional resistance, and anodic grounding is located within any protection zone.
EFFECT: eliminating anode zones formation on protected underground structure, leading to corrosion destructions.
1 cl, 4 tbl, 5 dwg
