Process for inhibiting corrosion of metal and corrosion-inhibiti

Details Process for inhibiting corrosion of metal and corrosion-inhibiti Process for inhibiting corrosion of metal and corrosion-inhibiti

1987-06-15

1989-03-28

Willis, Prince E.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

106 1415, 106 1417, 106 1444, 252 1, 252 8514, 252 493, 252 497, 2523891, 25238954, 252390, 422 7, 422 13, 422 16, 4273881, 427435, 428457, 524838, B32B 1504, C09K 1518

Patent

active

048163031

ABSTRACT:
Corrosion of ferrous metal and aluminum surfaces, in particular, is inhibited by a layer of an organic-metallic complex of a polyamine with a (i) metal oxide, or (ii) metallate ion, or (iii) water-soluble metallate salt, in aqueous systems having a pH greater than about 7. The polyamine contains at least four (4) amine groups, two of which are secondary amine groups. The effect of the N atoms stretched over the length of the polyamine produces a "caging effect"0 which immobilizes the oxide, or metallate ions, thus forming the protective layer. The organic-metallic complex deposited on the metal's surface forms the "amine-metallic" layer which may be either an "amine-metal oxide complex" which is a coordination complex, or, an "amine-metallate complex". The amine-metallate complex may be either an ionic complex of "amine.metallate ions", or, a mixture of the polyamine and metallate salt which mixture is not a complex, but in solution, behaves like one, and is therefore referred to as an admixture complex of an "amine+metallate salt". The organic-metallic complex may be present in a concentration from about 10 ppm to about 5% by wt in neutral or basic aqueous solution. In the lower range of this conc. up to about 2000 ppm, the complex is useful in aqueous process streams; in the higher range, from 2000 ppm to 5%, for a rinse for phosphated metal parts, in lieu of a conventional chromate rinse.

REFERENCES:
patent: 3346527 (1967-10-01), Lagally
patent: 3974323 (1976-08-01), Brouillette et al.
patent: 4129540 (1978-12-01), Kroenke
patent: 4161466 (1979-07-01), Kroenke
patent: 4217216 (1980-08-01), Lipinski
patent: 4285822 (1981-08-01), de Vries et al.
patent: 4414122 (1983-11-01), West et al.
patent: 4647388 (1987-03-01), Shrieiber
Stranick, M. A., "The Corrosion Inhibition of Metals by Molybdate-Part I. Mild Steal", National Ass'n of Corr. Eng., vol. 40, No. 6, Jun. 1984, 296.

Affiliated with

Also associated with

Rating

Process for inhibiting corrosion of metal and corrosion-inhibiti does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for inhibiting corrosion of metal and corrosion-inhibiti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for inhibiting corrosion of metal and corrosion-inhibiti will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1658307