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Tin alloy electroplating bath and plating method using same

Pending Publication Date: 2021-10-14
DISPOL CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides electroplating baths and a plating method using them that allow for the deposition of a coating with a desired alloy ratio. The coating has good adhesion to the base material, is even externally and has a stable plating solution that is resistant to oxidation and maintains clarity and absence of turbidity. The electroplating baths are mild acidic or neutral with a pH of 3 to 7, and do not require the use of glossing agents. The baths are easy to manage.

Problems solved by technology

In a situation where the fluoride bath is used, work environment is poor and deterioration of facilities is significant because fluorides are discharge regulated substances and are hazardous.
Moreover, the pyrophosphoric acid bath has a working current density range of about 1 A / dm2 at maximum and thus has poor productivity.
Since phenanthrolinedione exhibits its effects in a very trace amount, management of the bath is difficult.
The essential components of this bath are a stannate alkali substance and one of ethylenediamine and amino carboxylic acid whose bath management is industrially difficult.
However, in conventionally known tin alloy electroplating baths, particularly in tin alloy electroplating baths with high Sn ratios, these properties are not satisfactory and there is a demand for further improvements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[Plating Solution]

[0039]Ammonium citrate (150 g / L), ammonium sulfate (170 g / L), stannous sulfate (80 g / L), nickel sulfate hexahydrate (5 g / L), coconut oil fatty acid-amidopropyl dimethyl-amino acetic acid betaine (1.5 g / L), and picolinic acid (0.2 g / L) were dissolved into ion-exchange water and the pH thereof was adjusted to 6.0 by adding an appropriate amount of ammonia water. The plating solution after the preparation had a green external appearance.

[Plating Method]

[0040]A tough pitch copper flat plate with a size of 1.0 cm by 3.0 cm was subjected to cathode electrolytic degreasing (electrolytic degreasing-cleaning agent NC-20 manufactured by Dipsol Chemicals Co. Ltd. was used), washed with water, subjected to acid activation treatment (10% sulfuric acid), washed with water again, and then immersed in the aforementioned plating solution. Using the tough pitch copper flat plate as the cathode and a tin plate with a purity of 99.99% as the anode, a current was applied for 100 second...

example 2

[Plating Solution]

[0042]Ammonium citrate (150 g / L), ammonium sulfate (170 g / L), stannous sulfate (80 g / L), nickel sulfate hexahydrate (5 g / L), coconut oil fatty acid-amidopropyl dimethyl-amino acetic acid betaine (1.5 g / L), polyoxyethylene tallow alkylamine (0.5 g / L), and picolinic acid (0.1 g / L) were dissolved into ion-exchange water and the pH thereof was adjusted to 6.0 by adding an appropriate amount of ammonia water. The plating solution after the preparation had a green external appearance.

[Plating Method]

[0043]The same operations as those in Example 1 were performed except that the power supply device was changed to a pulse power supply. The ON time and OFF time of the pulse power supply were set to 0.4 seconds and 0.1 seconds, respectively, to achieve a duty ratio of 0.8.

[Result]

[0044]The deposit was visually observed as in Example 1 and was confirmed to have an even, grayish white, dull external appearance. A cellotape (registered trademark) (CT-18 manufactured by Nichiban ...

example 3

[Plating Solution]

[0045]Ammonium citrate (150 g / L), ammonium sulfate (170 g / L), stannous sulfate (80 g / L), cobalt sulfate heptahydrate (15 g / L), coconut oil fatty acid-amidopropyl dimethyl-amino acetic acid betaine (1.5 g / L), polyoxyethylene tallow alkylamine (0.5 g / L), and picolinic acid (0.1 g / L) were dissolved into ion-exchange water and the pH thereof was adjusted to 6.0 by adding an appropriate amount of ammonia water. The plating solution after the preparation had a purple external appearance.

[Plating Method]

[0046]The same operations as those in Example 1 were performed except that the current density was changed to 5 A / dm2.

[Result]

[0047]The deposit was visually observed as in Example 1 and was confirmed to have an even, grayish white, dull external appearance. A cellotape (registered trademark) (CT-18 manufactured by Nichiban Co., Ltd.) was attached to the deposit and removed. No adherence of the deposit to the tape was observed and thus the deposit demonstrated good adhesion...

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Abstract

A tin alloy electroplating bath, wherein the tin alloy electroplating bath includes (A) a soluble tin salt, (B) a soluble nickel salt and / or a soluble cobalt salt, (C) an oxycarboxylic acid or a salt thereof, (D) a nitrogen-containing heterocyclic unsaturated compound, and (E) a surfactant, and the pH of the tin alloy electroplating bath is 3 to 7.

Description

TECHNICAL FIELD[0001]The present invention relates to a tin alloy electroplating bath and a plating method using the same.BACKGROUND ART[0002]Electroplating of tin alloys such as tin-nickel and tin-cobalt has been used in the fields such as tin alloy electroplated coatings for soldering electronic parts and chip-type ceramic electronic parts.[0003]Various types of baths such as a fluoride bath, a pyrophosphoric acid bath, and an organic acid bath have been conventionally developed as baths for plating of a tin-nickel alloy or a tin-cobalt alloy by means of electrolysis. In a situation where the fluoride bath is used, work environment is poor and deterioration of facilities is significant because fluorides are discharge regulated substances and are hazardous. In the pyrophosphoric acid bath (Japanese Patent Application Publication No. S60-29482), a supply source of tin is tetravalent ions due to an alkaline PH, and the deposition rate of the pyrophosphoric acid bath is 50% lower than...

Claims

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Application Information

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IPC IPC(8): C25D3/60C25D5/18
CPCC25D3/60C25D5/18C25D5/627C25D5/611C25D7/00C25D5/04C25D5/08C25D5/34
Inventor MORII, YUTAKANAGATA, GOYUASA, SATOSHI
Owner DISPOL CHEMICALS CO LTD
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