Ferrous substrate with rubber adherent metal coating and method of making the same
AssigneeNV Bekaert SA
InventorPaul Dambre
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Abstract
A rubber adherable ferrous substrate for use in reinforcing vulcanizable elastomeric products includes a cold worked steel wire having a brass alloy coating of specified compact structure on its surface. There is provided also a process for covering a steel wire substrate with a compact alloy coating, in particular a thin brass diffusion coating having a specified permeability.
Claims24
A ferrous reinforcing substrate having a rubber adherent brass-alloy coating thereon of an improved porosity property in view of securing a more durable vulcanization bond between said substrate and rubber, the improvement wherein said coating has a compact structure substantially free from macropores and micropores characterized in that said coating comprises an amount of penetrated substrate iron of less than 0.5% of the coating weight, said penetrated substrate iron being predominantly non-solute iron.
A process for preparing a ferrous substrate with a thermodiffused rubber adherable brass alloy coating of compact structure, comprising the steps of:
- (a) plating the substrate with a first layer of a brass alloy forming metal,
- (b) plating on top thereof at least one additional layer of a brass alloy forming metal,
- (c) transversely compressing said layers on said substrate to render them substantially free from pores before tarnishing and internal oxidation of the coating can occur,
- (d) heating the substrate to produce an interdiffusion of the metal coatings so as to form said brass alloy coating, and
- (e) optionally cold work finishing the thus coated and diffused substrate to a desired end size or shape.
Dependencies are inferred from the claim text.