Combinations of imidazolines and wetting agents as environmentally acceptable corrosion inhibitors
US6338819B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1999 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Feb 16, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F11/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and corrosion inhibitor for inhibiting corrosion of metal equipment in an aqueous medium comprising components selected from the group consisting of Skeletonema costatum, fish, other algae, and a combination thereof. The method comprises incorporating into the medium a corrosion inhibiting amount of a water soluble corrosion inhibitor comprising an N-ethoxy, 2-substituted imidazoline. The N-ethoxy substituent comprises a quantity of ethylene oxide effective to render the imidazoline water soluble. The corrosion inhibitor is rendered more environmentally compatible by shortening the number of carbon atoms in the fatty acid chain at the 2-position of the imidazoline. The fatty acid chain consists essentially about 18 carbon atoms or less, preferably about 10 carbon atoms or less, most preferably from about 6 to about 8 carbon atoms. As the number of carbon atoms in the fatty acid chain is reduced, the efficacy of the corrosion inhibitor is increased by combination with a wetting agent, preferably an ethoxylated alcohol having from about 8 to about 10 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.