C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/45
C09K 15/18 (2006.01) B32B 15/04 (2006.01)
Patent
CA 1281539
PROCESS FOR INHIBITING CORROSION OF METAL AND CORROSION-INHIBITING LAYER USED THEREIN ABSTRACT OF THE DISCLOSURE 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" 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+met- allate 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 8 rinse for phosphated metal parts, in lieu of a conventional chromate rinse.
504784
Kroenke William Joseph
Mazany Anthony Michael
Standish John Vellon
Swabey Ogilvy Renault
The B.f. Goodrich Company
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