Electrolytic stripping agent for jig
AssigneeOkuno Chemical Industries Co., Ltd.
InventorsYusuke Yoshikane, Koji Kita
Life of this patent
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Abstract
An object of the invention is to provide a jig electrolytic stripper that can sufficiently remove palladium adhered to the current-conducting portion of a plating jig, that can remove palladium adhered to the insulating-material-coated portion of the jig, and that exhibits reduced erosion of the metal of the current-conducting portion of the jig. The jig electrolytic stripper comprises the following components (A) to (C): (A) at least one member selected from the group consisting of nitric acid and salts thereof, (B) at least one member selected from the group consisting of ammonia, ammonium salts, ethylene amine compounds, alkyl diamine compounds, and amino acids, and (C) a bromide.
Claims30
A jig electrolytic stripper for removing palladium adhered to an insulating material coated portion comprising the following components (A) to (C) and component (E):
- (A) at least one member selected from the group consisting of sodium nitrate, potassium nitrate, calcium nitrate, iron nitrate, silver nitrate, lead nitrate, zinc nitrate, and barium nitrate,
- (B) at least one member selected from the group consisting of ammonia, ammonium salts, ethylene amine compounds, alkyl diamine compounds, and amino acids,
- (C) a bromide, and
- (E) an oxidant, wherein the oxidant (E) is at least one member selected from the group consisting of bromates, and
- wherein the content of component (E) is 0.1 to 20 g/L.
A jig electrolytic stripper for removing palladium adhered to an insulating material coated portion comprising the following components (A) to (F):
- (A) is selected from the group consisting of sodium nitrate, potassium nitrate, calcium nitrate, iron nitrate, silver nitrate, lead nitrate, zinc nitrate, and barium nitrate, and is at a content of 10 to 100 g/L,
- (B) is selected from the group consisting of ethylene diamine, diethylene triamine, triethylenetetramine, tetraethylenepentamine, 1,3-trimethylenediamine, 1,4-tetramethylenediamine, 1,6-hexamethylenediamine,glycine, alanine, and cysteine, and is at a content of 30 to 300 g/L,
- (C) is selected from the group consisting of hydrogen bromide, sodium bromide, potassium bromide, calcium bromide, and ammonium bromide, and is at a content of 10 to 100 g/L,
- (D) is selected from the group consisting of copper sulfate, copper chloride, copper bromide, copper iodide, copper acetate, copper nitrate, and copper oxide, and the content of copper ions is 1 to 30 g/L,
- (E) is selected from the group consisting of bromic acid and bromates, and is at a content of 0.1 to 20 g/L,
- (F) is selected from the group consisting of acetic acid, citric acid, maleic acid, succinic acid, lactic acid, malic acid, tartaric acid, and ethylenediaminetetraacetic acid, and is at a content of 5 to 50 g/L,
- wherein stripper is an aqueous solution dissolved in water, and
- wherein the stripper has a pH of 8 to 10.
A method for removing palladium adhered to an insulating material coated portion, the method comprising contacting a jig electrolytic stripper comprising the following components (A) to (C) and component (E) with an object to be treated on which palladium is adhered:
- (A) at least one member selected from the group consisting of sodium nitrate, potassium nitrate, calcium nitrate, iron nitrate, silver nitrate, lead nitrate, zinc nitrate, and barium nitrate,
- (B) at least one member selected from the group consisting of ammonia, ammonium salts, ethylene amine compounds, alkyl diamine compounds, and amino acids,
- (C) a bromide, and
- (E) an oxidant, wherein the oxidant (E) is at least one member selected from the group consisting of bromates, and
- wherein the content of component (E) is 0.1 to 20 g/L.
Dependencies are inferred from the claim text.