Corrosion-inhibiting rubber and methods of preparation
AssigneeNorthern Instruments Corporation
InventorsBoris A. Miksic, Donovan P. Stern
Life of this patent
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Abstract
The disclosed corrosion-inhibiting elastomers are typically made by milling the corrosion inhibitor into a solid rubber matrix. Preferred corrosion inhibitors include the aromatic carboxylates of primary, secondary or tertiary amines. Chromates and 2-ethylhexanoates can also be used. Organic ammonium nitrites are effective against some types of corrosion, but should be used with relatively inert elastomers. There appears to be synergistic cooperation between the elastomeric molecular structure and the corrosion inhibitor resulting in unusually effective protection of ferrous and/or nonferrous metals adjacent to rubber parts made from the corrosion-inhibiting elastomer.
Claims20
A solid, corrosion-inhibiting elastomer containing a non-cellular or intercellular elastomeric matrix, said elastomeric matrix containing a corrosion-inhibiting amount of the corrosion-inhibiting compound cyclohexamethyleneimine dinitrobenzoate distributed through said elastomeric matrix.
A metal substrate coated with a layer of corrosion-inhibiting elastomer, said layer comprising at least two laminae:
- a. a first lamina, directly in adherent interfacial contact with said metal substrate, said lamina comprising a non-cellular elastomer having 0.1-30% by weight of cyclohexamethyleneimine dinitrobenzoate dispersed therethrough;
- b. a second lamina, in interfacial contact with said first lamina, said second lamina comprising a non-cellular elastomer having an amount exceeding 0.5% by weight of cyclohexamethyleneimine dinitrobenzoate dispersed therethrough, said amount being less than the amount of cyclohexamethyleneimine dinitrobenzoate in said lamina (a).
A corrosion inhibiting composition comprising:
- 0.15-4 parts by weight of cyclohexamethyleneimine 3,5-dinitrobenzoate and
- 0.15-4 parts by weight of at least one of the following corrosion inhibiting compounds in combination therewith:
- cyclohexamethyleneimine mononitrobenzoate
- cyclohexamethyleneimine benzoate.
A corrosion inhibiting composition comprising, in combination:
- a. cyclohexamethyleneimine 3,5-dinitrobenzoate;
- b. at least one additional compound selected from the group consisting of:
- an aromatic carboxylate of a primary, secondary, or tertiary amine;
- a salt of chromic acid;
- and
- a salt of nitrous acid.
Dependencies are inferred from the claim text.