Corrosion inhibiting composition for protecting the metallic surfaces of plants using water as a thermal or energetic fluid, and process for protecting these surfaces

摘要

This invention relates to a new anticorrosive composition for protecting metallic surfaces which are in contact with water as energetic or thermic corrosive fluid, in particular circuits, apparatus, devices or systems producing or using dry steam, wet steam, superheated water or hot water. Said anticorrosive composition comprises (a) 1 to 100 parts by dry weight of an amine component selected from the group consisting of neutralizing amines and mixtures thereof, and (b) 1 part by dry weight of an amine component selected from the group consisting of film-forming polyamines of the formula R-[NH-(CH2)m]n-NH2 (II) wherein R is a saturated or unsaturated hydrocarbon radical having from 12 to 22 carbon atoms, m is an integer between 2 to 8 inclusive and n is an integer between 1 to 7 inclusive; and mixtures thereof. This invention is also concerned with a method for protecting the metallic surfaces of a system containing a generator of dry steam, wet steam, superheated water or hot water, which comprises administering said anticorrosive composition at the level of the deaerator-storage tank.