Method for electroplating with tin-zinc alloy

Inactive Publication Date: 2007-08-30
DISPOL CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] With the present invention, electroplating with a tin-lead alloy can be carried out within a short interval by using a specific tin-zinc alloy plating bath at a plating bath temperature and plating bath stirring rate above the predetermined values.

Problems solved by technology

As a result, the practical use of high-speed electroplating is made difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] A steel sheet was pretreated and then electroplated by using the following plating solution under the conditions of a plating bath temperature of 60° C. and a plating bath stirring rate of 50 m / min.

Tin (I) sulfate (as tin)30g / LZinc sulfate (as zinc)25g / LCitric acid150g / L(0.71 mole / L)Ammonium sulfate100g / LProduct obtained by reacting 1 mole10mL / Lof ethylene diamine and 1 mole ofdimethyl malonate for 60 mins. at 85° C.and then reacting phthalic anhydridewith the obtained product at a weightratio of 0.5:1 for 90 mins. at 95° C.pH 4 (adjusted with ammonia water)

example 2

[0026] A steel sheet was pretreated, Nymin NAG-1001 manufactured by Nippon Oils & Fats Co., Ltd. was added as a nonionic surfactant at 5 g / L to the plating solution of Embodiment 1, and electroplating was conducted under the conditions of a plating bath temperature of 60° C. and a plating bath stirring rate of 30 m / min.

example 3

[0027] A steel sheet was pretreated and then electroplated by using the following plating solution under the conditions of a plating bath temperature of 60° C. and a plating bath stirring rate of 30 m / min.

Potassium stannate (as tin)55g / LZinc oxide (as zinc)5g / LPotassium hydroxide80g / LPotassium carbonate100g / LProduct obtained by reacting 1 mole of1g / L1-methyl imidazole and 1 mole ofbenzyl chloride for 180 mins. at 85° C.Product obtained by reacting 1 mole of1g / Ldiethylene triamine and 1 mole ofethylene chlorhydrine for 90 mins. at 100° C.pH 14

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Abstract

The object of the present invention is to provide an electroplating method that enables the high-speed treatment of articles to be plated that was difficult to achieve with the conventional tin-zinc electroplating. The present invention provides a method for electroplating with a tin-zinc alloy that is performed under the following conditions: plating bath temperature 30 to 90° C., plating bath stirring rate 5 to 300 m / min, and cathode current density 5 to 200 A / dm2. Preferably, in the tin-zinc alloy plating bath, the divalent tin ion concentration is 1 to 100 g / L and the zinc ion concentration is 0.2 to 80 g / L.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for electroplating with a tin-zinc alloy. BACKGROUND ART [0002] Because electroplating with tin-zinc alloys produces coatings that excel in corrosion resistance, processability and solderability, this method has attracted attention and been widely applied to automobile parts and electronic components. Alkali cyan baths, pyrophosphoric acid baths, borofluoride baths, sulfonic acid baths and carboxylic acid baths have been suggested for use as plating baths in electroplating with tin-zinc alloys, and some of these baths have been practically used. [0003] With the conventional methods using such electroplating baths, when the treatment is carried out at a high current density to shorten the treatment time, coarse precipitates, burns, and scorches appear in the plated layer and characteristics of the tin-zinc alloy coating are degraded. As a result, the practical use of high-speed electroplating is made difficult. The syst...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D3/60
CPCC25D3/565C25D21/10C25D5/08C25D3/60
InventorYUASA, SATOSHI
OwnerDISPOL CHEMICALS CO LTD