Importance

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Abstract

Coating composition and respective process for applying same to metal substrates. The present invention pertains to the field of coatings, more specifically to an anti-corrosion coating composition comprised of at least three layers to provide protection against galvanic corrosion. The coating (5) is configured by at least three distinct layers (2, 3, 4) applied to the same metallic component. The base layer (2) consists of an organometallic dispersion containing zinc and aluminum alloys or a zinc or zinc alloy base applied electrolytically to the metal surface (1). An aqueous intermediate layer (3) is applied over the base layer (2) containing silicon oxide nanoparticles of up to 50 nanometers. An outer layer (4) rich in aluminum dispersed in organic solvents or water and binding elements is also affixed to intermediate layer (3). The present invention further discloses a process for applying the coating (5) and the use thereof in fastening elements that are in direct contact with aluminum components that are much larger than said fastening elements, in order to prevent galvanic corrosion.

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First Claim