Surface Preparation of Copper and Its Alloys for Adhesive Bonding and Organic Coatings

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Abstract
Two new surface treatments for copper are described, one based on oxidation with alkaline permanganate and the other on electrodeposition of chromium oxide from alkaline chromate bath. The nature and thickness of generated surface layers are discussed on the basis of scanning electron microscope, X-ray fluorescence, atomic absorption and electrolytic reduction results. Data on initial strengths and durability of joints made with different alloys and adhesives are given. It is shown that selective etching of zinc from low copper alloys, before surface treatment, improves initial joint strength and durability.

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