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US 4,731,128 AGranted
Protection of copper from corrosion
AssigneeInternational Business Machines Corporation
InventorFrank J. Casullo
Life of this patent
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Abstract
Copper is protected from corrosion by contacting the copper with a first azole and then contacting the copper with a second and different azole. The chemical reactivity of the first azole with copper must be greater than the reactivity of the second and different azole with copper. Also, the absorbency of the second azole on copper must be greater than the absorbency of the first azole on the copper.
Claims13
A method for protecting copper from corrosion which comprises:
- (a) contacting a copper-containing surface with a first azole to form a first layer thereon;
- and
- (b) contacting the copper from step (a) with a second and different azole;
- wherein the first azole chemically reacts more readily with copper than does the second and different azole with copper;
- and wherein the adsorbency of the second and different azole on copper is greater than the adsorbency of the first azole.
2 more elements
Dependencies are inferred from the claim text.