Anticorrosion means and compositions containing same

US4613450A · kind A · utility

Assignee

• Union Chimique et Industrielle de l'Ouest · FR

Inventors

• Francis Moran · Paris, FR
• Sylvain Rocher · Le Mans, FR
• Louis Cot · Castelnau-le-Lez, FR
• Francis Dabosi · Ramonville-Saint-Agne, FR
• Michel Duprat · Ramonville-Saint-Agne, FR
• Jean-Marc Durand · Colomiers, FR

Key dates

• Filing date: Mar 25, 1985
• Grant date: Sep 23, 1986
• Expiry date: Mar 25, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/184
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

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: PA1 (i) compound of the formula M.sub.2.sup.I PO.sub.3 F, xH.sub.2 O PA1 (ii) compound of the formula LiM.sup.I PO.sub.3 F, xH.sub.2 O PA1 (iii) compound of the formula NaM.sup.I PO.sub.3 F, xH.sub.2 O PA1 (iv) compound of the formula M.sup.II PO.sub.3 F, xH.sub.2 O PA1 (v) compound of the formula M.sub.2.sup.I M.sup.II (PO.sub.3 F).sub.2, xH.sub.2 O PA1 (vi) compound of the formula M.sup.I PO.sub.2 F.sub.2, xH.sub.2 O PA1 (vii) compound of the formula M.sup.II (PO.sub.2 F.sub.2).sub.2, x H.sub.2 O (wherein M.sup.I is Na, K, Rb, Cs or HN.sub.4 ; M.sup.II 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 PA1 (viii) mixtures thereof.