C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
117/214, 31/51,
C07F 9/38 (2006.01) C02F 5/14 (2006.01) C23F 11/08 (2006.01) C23F 11/167 (2006.01) C25D 11/36 (2006.01)
Patent
CA 1222749
3-14341/MA 1845/1+2/+ Process of inhibiting corrosion of metal surfaces and/or deposition of scale thereon ABSTRACT OF DISCLOSURE Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon by treating said surfaces: A. prior to contact with a corrosive or scaling environment, with (i) compound having the formula I: Image (I) or a water-soluble salt (or partial ester or-salt) thereof,wherein R1 and R2 are the same or different and each is hydrogen, a C1-C12 straight- or branched chain alkyl group (optionally substi- tuted by one or more hydroxy- and/or carboxyl groups and/or option- ally interrupted by one or more oxygen atoms), a C3-C12 straight- or branched chain alkenyl group, a C7-C15 aralkyl group or -CH2PO3H2, or R1 and R2, together with the nitrogen atom to which they are each bonded, may form an optionally-substituted hetero- cyclic ring; R3 is hydrogen, a C1-C12 straight- or branched chain alkyl group or an optionally substituted C6-C10 aryl group; and R4 is hydrogen or Cl-C4 alkyl; and (ii) optionally a metal ion component b) as hereinafter defined; and/or B. during contact with an aqueous system capable of corroding a metal surface or of depositing scale thereon, with a) a compound of formula I or a water-soluble salt (or partial salt) thereof; and optionally b) a metal ion which enhances, synergistically, the metal conditioning effected, individually, by the compound of for- mula I and the metal ion.
448595
Cook Barry
Ag Ciba-Geigy
Fetherstonhaugh & Co.
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