composition and method of coating on aluminium and aluminium alloys.

摘要

A protective coating composition and process is described for simultaneously sealing and priming the anodic coating applied to aluminum and alloys thereof without the need for elevated temperatures during a subsequent curing step. The composition comprises a colloidal, water-borne polyurethane resin which is an aromatic, aliphatic or alicyclic copolymer. The composition is curable at ambient temperatures but may include a cross-linking agent as well as a thermosetting catalyst. The process comprises the steps of anodizing the component to be coated, applying the coating composition at elevated temperatures to thereby simultaneously seal and prime the component and curing the sealed and primed component at ambient temperatures. If cross-linking agents are employed then elevated cure temperatures are utilized.