Anticorrosion means and compositions containing same

摘要

This invention relates to a corrosion inhibitor for protecting metallic surfaces which are in contact with water, in particular circuits, apparatus and devices which use water as energetic or thermic fluid, said corrosion inhibitor being a fluorophosphate compound selected from the group consisting of: (i) compound of the formula M2IPO3F, xH2O (ii) compound of the formula LiMIPO3F, xH2O (iii) compound of the formula NaMIPO3F, xH2O (iv) compound of the formula MIIPO3F, xH2O (v) compound of the formula M2IMII(PO3F)2, xH2O (vi) compound of the formula MIPO2F2, xH2O (vii) compound of the formula MII(PO2F2)2, x H2O (wherein MI is Na, K, Rb, Cs or HN4; MII is Mg, Ca, Ba, Sr, Zn, Cd, Mn, Ni or Co; and x is an integer or a fractional number comprised between 0 and 6) and (viii) mixtures thereof.