CORROSION INHIBITOR COMPRISING COMPLEX OLIGOMERIC STRUCTURES DERIVED FROM VEGETABLE OILS

A corrosion inhibitor comprising from 1% by weight to 80% by weight, preferably from 2% by weight to 35% by weight, relative to the total weight of said corrosion inhibitor, of complex oligomeric structures derived from vegetable oils, said complex oligomeric structures being of the ester type comprising: (A) long chain hydroxy acids with at least one secondary hydroxyl group; (B) medium-long chain alpha-omega diacids and optionally (C) long chain monoacids, said structures also containing free acid groups or their esters with mono-and polyalcohols. Said corrosion inhibitor may advantageously be used in the oil or gas production field, in particular for protecting against corrosion drilling systems, crude oil extraction plants, pipelines for transporting liquid hydrocarbons (for example,oil, crude oils and refining products or petrochemical products), storage containers of said liquid hydrocarbons, refining plants (including cooling and refrigeration systems), wastewater treatment plants from industrial processes. Moreover, said corrosion inhibitor may advantageously be used for protecting against corrosion ferrous or non-ferrous metal surfaces that come in contact with corrosive fluids, both fluids based on water or on water/glycols and gaseous fluids (for example,cylinder heads and radiators).