METHOD FOR ELECTRIC PROTECTION OF METAL OBJECT, GROUNDING ELECTRODE FOR EFFECTING THIS METHOD AND COMPOSITION FOR THE GROUNDING ELECTRODE

摘要

A method for electric protection of a metal object, in which a long-line grounding electrode is installed in an electrolytic medium at a preset distance from the metal object to be protected and the metal object and the long-line grounding electrode are electrically connected to a current source to form a protection circuit, the metal object is polarized, while the sections of the electric connection and the geometric dimensions and/or electric parameters of the grounding electrode are so selected that the value of the current propagation constant in the protection circuit is less than or equal to 10 3m 1. The grounding electrode has an extended central flexible metal conductor (18), an adhesive layer (20) providing an electric contect, and an envelope (19) of a slightly soluble current-conductive material based on a composition including a carbon-containing filler in an amount of 40-80 wt%, a rubber-base polymer in an amount of 10-49.8 wt%, a plasticizer in an amount of 9-10 wt% and an insecticide in an amount of 0.2-1.0 wt.%.