FIELD: corrosion protection. SUBSTANCE: invention relates to metal constructions perpetually or periodically operated in seawater. System provides and maintains optimum conditions for cathodic corrosion protection of metal constructions made of heterogeneous alloys (e.g. steel and aluminum). System contains controllable constant current source, negative connection terminal of which is connected with hull, positive terminal with anode, and source input with control unit output. System also comprises reference electrode, supplementary reference electrode, protection potential setup source, supplementary protection potential setup source, and setup source regulator. EFFECT: increased corrosion protection reliability. 1 dwg
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