ETCHING, ELECTROCHEMICALLY GRAINING, AND ANODIZING ALUMINUM PLATE

摘要

Abstract of the DisclosureA method for treating an aluminum sheet useful for lithography byetching said sheet in an aqueous bath containing up to about 25%of nitric and/or hydrochloric acids and from about 1% to about25% of an inorganic fluorine containing acid or salt thereof.Said etching step is sequentially followed by electrochemicalgaining and anodizing process steps.