PROCESS FOR MANUFACTURING ALUMINIUM PANELS WITH IMPROVED CORROSION RESISTANCE IN AQUEOUS MEDIA

摘要

The process for manufacturing aluminium panels comprises the surface preparation of two sheets made of aluminium alloy, the deposition on one of the sheets of an anti-weld ink in reserve zones corresponding to the circuit design, the bonding of the sheets to each other by rolling, and the expansion of the channels corresponding to the non-welded zones by means of a pressurized fluid. In this process, said ink comprises the following constituents: a) a mineral filler in the divided state, such as mica, a montmorillonite clay, talc, boron nitride, alumina or silica; b) an organic thickener (polymer); c) a corrosion resistance promoter in the form of a chemical adsorption or conversion agent (salt); d) a solvent comprising at least 50 wt.% water. The resulting panels have a high corrosion resistance without added graphite and can be used for making solar or heat-exchanging panels.