Corrosion prevention for CAC component

The present invention relates to printed circuit boards in general, and more specifically to components employed in the manufacturing of printed circuit boards and other articles. A component for use in manufacturing articles such as printed circuit boards, the component comprising:a sheet of copper foil which, in a finished printed circuit board, constitutes a functional element;a substrate sheet of aluminum which constitutes a discardable element, anda protective coating layer on a surface of said substrate, one surface of the copper sheet and the coating layer on said substrate aluminum sheet being essentially uncontaminated and engageable with each other at an interface, and the uncontaminated surfaces of the sheets being manufactured together to define a substantially uncontaminated central zone inwardly of the edges of the sheets and unjoined at the interface.