Etching solution for tin-nickel alloy and process for etching the same
AssigneeNitto Electric Industrial Co., Ltd.
InventorsTakeshi Kakuhashi, Kazuo Fukunaga
Life of this patent
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Abstract
An etching solution containing 0.1 mol/l or more phosphoric acid, 0.05 mol/l or more pyrophosphoric acid, 0.1 mol/l or more phosphorous acid, 0.1 mol/l or more of a mixture of phosphoric, pyrophosphoric and/or phosphorous acids, molten phosphoric acid, molten pyrophosphoric acid, molten phosphorous acid or a molten mixture of phosphoric, pyrophosphoric and/or phosphorous acids, for use in etching a tin-nickel alloy; and a process for etching the tin-nickel alloy with the etching solution.
Claims45
A process for etching a tin-nickel alloy which comprises etching the alloy at a temperature of greater than about 80.degree. C. with a solution containing at least one phosphoric acid compound selected from the group consisting of 0.1 mol/l or more phosphoric acid, 0.05 mol/l or more pyrophosphoric acid, 0.1 mol/l or more phosphorous acid, 0.1 mol/l or more of a mixture of phosphoric, pyrophosphoric and/or phosphorous acids, molten phosphoric acid, molten pyrophosphoric acid, molten phosphorous acid and a molten mixture of phosphoric, pyrophosphoric and/or phosphorous acids.
A process for etching a tin-nickel alloy which comprises etching the alloy at a temperature of greater than about 70.degree. C. with a solution containing (a) at least one phosphoric acid compound selected from the group consisting of 0.1 mol/l or more phosphoric acid, 0.05 mol/l or more pyrophosphoric acid, 0.1 mol/l or more phosphorous acid, 0.1 mol/l or more of a mixture of phosphoric, pyrophosphoric and/or phosphorous acids, molten phosphoric acid, molten pyrophosphoric acid, molten phosphorous acid and a molten mixture of phosphoric, pyrophosphoric and/or phosphorous acids, and (b) an oxidizing agent.
A process for etching a tin-nickel alloy which comprises etching the alloy with a solution containing (a) at least one of a phosphoric acid compound selected from the group consisting of 0.1 mol/l or more phosphoric acid, 0.05 mol/l or more pyrophosphoric acid, 0.1 mol/l or more phosphorous acid, 0.1 mol/l or more of a mixture of phosphoric, pyrophosphoric and/or phosphorous acids, molten phosphoric acid, molten pyrophosphoric acid, molten phosphorous acid and a molten mixture of phosphoric, pyrophosphoric and/or phosphorous acids, (b) an oxidizing agent and (c) hydrochloric acid, sulfuric acid or a mixture thereof.
Dependencies are inferred from the claim text.