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Release agent for electrolytic silver

A technology of electrolytic stripper and preventive agent, which is applied in the field of silver electrolytic stripper, and can solve the problems of low consumption, short bath life, and increased gloss

Active Publication Date: 2010-01-13
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As non-cyanide silver strippers, applications have been made for succinimide or phthalimide (for example, referring to Japanese Patent Laid-Open No. 2-104699), 5 and 6-membered ring compounds with -NH- ( For example, refer to JP-A No. 2-175825), 2-pyrrolidone-5-carboxylic acid (for example, refer to JP-A 6-41800), hydantoin compounds (for example, refer to JP-A-7-243100), etc., but The first three have the problems of high consumption and short bath life due to the intense decomposition of the bath.
On the other hand, since the hydantoin compound has less bath decomposition, it consumes less and has a longer life. However, if silver peeling is carried out at a high current density in order to improve productivity, unevenness and glossiness tend to occur on the silver surface where necessary parts exist. rising issue

Method used

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  • Release agent for electrolytic silver
  • Release agent for electrolytic silver
  • Release agent for electrolytic silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～3

[0029] A peeling bath having the composition shown in Table 1-1, Table 1-2, and Table 1-3 was prepared. As a sample, an SOP-type lead frame with 28 pins (pins) having 0.05 μm of copper strike plating and 5 μm of silver dot plating on the entire surface of the copper alloy material was used and immersed in the above-mentioned stripping bath. 1-1, Table 1-2 and Table 1-3 show the stripping conditions for electrolytic stripping.

[0030] The samples after peeling were evaluated as follows.

[0031] Silver Appearance and Base Material Appearance

[0032] By visual inspection and microscopic observation (×50), unevenness and defects were observed. It is good if no unevenness and defects can be seen.

[0033] Silver Gloss

[0034] The measurement was performed with a gloss meter (Dainippon Sculin, DM-400). The larger the value, the higher the glossiness. The glossiness of the silver surface before silver peeling was 0.40.

[0035] Silver stripping speed

[0036] The thicknes...

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PUM

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Abstract

A release agent for electrolytic silver. The release agent contains no cyanide, has a long life, and is highly effective in silver release from edge sides. It inhibits the necessary silver surface parts from having unevenness of surface roughness or an increased gloss after silver release. The release agent for electrolytic silver comprises a hydantoin compound and an aminocarboxylic acid or salt thereof as major ingredients. The hydantoin compound preferably is hydantoin, 5,5-dimethylhydantoin, 5,5-dimethyl-3-hydroxymethylhydantoin, allantoin, or a salt of any of these. The aminocarboxylic acid or salt preferably is aspartic acid, glutamic acid, or a salt of either.

Description

technical field [0001] The present invention relates to a silver electrolytic stripper, and particularly to an electrolytic stripper suitable for electrolytic stripping of unnecessary silver from a silver-plated film. Background technique [0002] As non-cyanide silver strippers, applications have been made for succinimide or phthalimide (for example, referring to Japanese Patent Laid-Open No. 2-104699), 5 and 6-membered ring compounds with -NH- ( For example, refer to JP-A No. 2-175825), 2-pyrrolidone-5-carboxylic acid (for example, refer to JP-A 6-41800), hydantoin compounds (for example, refer to JP-A-7-243100), etc., but The former three have the problems of high consumption and short bath life due to intense bath decomposition. On the other hand, since the hydantoin compound has less bath decomposition, it consumes less and has a longer life. However, if the silver peeling is carried out at a high current density in order to improve productivity, unevenness and glossin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F5/00
CPCC25F5/00
Inventor 相场玲宏三村智晴
Owner JX NIPPON MINING & METALS CORP