A method for the improvement of the second-phase fe-containing of radiators of copper and copper alloys, as well as in this way are to be radiators

摘要

process for improving the corrosion resistance of the radiators in copper and copper alloys, characterized by subjecting the radiators, after assembly and soldering of components.in the following operations: - cleaning - degreasing; cold; rinse with cold water, rinsing with demineralized water, filmogena phosphating surface with solution in water demineralizzata of phosphoric acid or its derivatives, chromic acid or its salts.reducing agent for hexavalent chromium into trivalent chromium and polymer resin; removal of the excess of the filmogena phosphating solution; drying; graffatura tanks; applicationi paint powder; and baking the paint.