Process of inhibiting corrosion of metal surfaces and/or deposition of scale thereon
US4501667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1984 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Feb 21, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Process for conditioning metal surfaces to inhibit their corrosion and/or to inhibit scale deposition thereon by treating said surfaces: PA0 A. prior to contact with a corrosive or scaling environment, with PA1 (i) compound having the formula I: ##STR1## or a water-soluble salt (or partial ester or -salt) thereof, wherein R.sub.1 and R.sub.2 are the same or different and each is hydrogen, a C.sub.1 -C.sub.12 straight- or branched chain alkyl group (optionally substituted by one or more hydroxy- and/or carboxyl groups and/or optionally interrupted by one or more oxygen atoms), a C.sub.3 -C.sub.12 straight- or branched chain alkenyl group, a C.sub.7 -C.sub.15 aralkyl group or --CH.sub.2 PO.sub.3 H.sub.2, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are each bonded, may form an optionally-substituted heterocyclic ring; R.sub.3 is hydrogen, a C.sub.1 -C.sub.12 straight- or branched chain alkyl group or an optionally substituted C.sub.6 -C.sub.10 aryl group; and R.sub.4 is hydrogen or C.sub.1 -C.sub.4 alkyl; and PA1 (ii) optionally a metal ion component (b) as hereinafter defined; and/or PA0 B. during contact with an aqueous system capable of corroding a metal s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.