| abstract |
PROBLEM TO BE SOLVED: To provide an etching solution for nickel or a nickel alloy in which nickel or a nickel alloy has a high etching rate, erosion of other metals, particularly copper or a copper alloy is extremely small, and further, side etching hardly occurs. To provide. An etching solution for selectively etching nickel or a nickel alloy from a material in which nickel or a nickel alloy and another metal are mixed, (A) 5-55% by weight of nitric acid, (B) 0.5-40% by weight of sulfuric acid, (C) 0.1-20% by weight of a main oxidizing agent selected from peroxides, nitrates and aromatic nitro compounds; (D) An etching solution for nickel or a nickel alloy comprising an aqueous solution containing 0.0001 to 0.5% by weight of chloride ions. |