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Tin-zinc alloy electroplating method

A zinc alloy and plating solution technology, applied in electrolytic components, electrolytic process, cells, etc., can solve problems such as difficulties in the practical application of high-speed electroplating, yellowing, and damage to the plating characteristics of tin-zinc alloys

Active Publication Date: 2007-07-18
DISPOL CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the conventional methods using these electroplating baths, when processing at a high current density in order to shorten the processing time, rough deposition, yellowing, burning, etc. of the plating occur, and the characteristics of the tin-zinc alloy plating are destroyed. Therefore, Practical application of high-speed electroplating is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After the pretreatment of the steel sheet, electroplating treatment was performed using the following plating bath under conditions of a plating bath temperature of 60° C. and a stirring speed of the plating solution of 50 m / min.

[0031] Stannous sulfate (calculated as tin) 30g / L

[0032] Zinc sulfate (calculated as zinc) 25g / L

[0033] Citric acid 150g / L (0.71mol / L)

[0034] Ammonium sulfate 100g / L

[0035] 1 mole of ethylenediamine and 1 mole of malonate 10ml / L

[0036] The methyl ester was reacted at 85°C for 60 minutes to obtain

[0037] product, so that 1 part of the product and

[0038] 0.5 parts of phthalic anhydride reacted at 95°C

[0039] The product should be obtained in 90 minutes

[0040] pH4 (adjusted with ammonia water)

Embodiment 2

[0042] After the steel plate is pretreated, add 5g / L Nymin NAG-1001 manufactured by NOF (KK) as a nonionic surfactant in the plating bath of Example 1, at a temperature of the plating bath of 60°C, stirring of the plating solution The electroplating treatment was carried out at a speed of 30 m / min.

Embodiment 3

[0044] After the pretreatment of the steel sheet, electroplating treatment was performed using the following plating bath under conditions of a plating bath temperature of 60° C. and a stirring speed of the plating solution of 30 m / min.

[0045] Potassium stannate (calculated as tin) 55g / L

[0046] Zinc oxide (calculated as zinc) 5g / L

[0047] Potassium hydroxide 80g / L

[0048] Potassium carbonate 100g / L

[0049] 1 mole of 1-methylimidazole and 1 mole of benzyl 1g / L

[0050] Chlorine is produced by reacting at 85°C for 180 minutes

[0051] product

[0052] 1 mole of diethylenetriamine and 1 mole of 2-chloroethane 1g / L

[0053] Alcohol reacted at 100°C for 90 minutes

[0054] product

[0055] pH14

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PUM

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Abstract

Disclosed is an electroplating method realizing short-time processing which has been difficult for conventional tin-zinc alloy electroplating methods. Specifically disclosed is a method for performing tin-zinc alloy electroplating under the following conditions: the plating liquid temperature is 30-90 DEG C; the stirring rate of the plating liquid is 5-300 m / min; and the cathode current density is 5-200 A / dm<2>. Preferably, the divalent tin ion concentration in the tin-zinc alloy plating bath is 1-100 g / L, while the zinc ion concentration is 0.2-80 g / L.

Description

technical field [0001] The invention relates to a tin-zinc alloy electroplating method. Background technique [0002] Tin-zinc alloy plating is excellent in corrosion resistance, workability, and solderability, so it is attracting attention and widely used as industrial plating for automotive parts and electronic parts. Alkaline cyanide baths, pyrophosphoric acid baths, fluoboric acid baths, sulfonic acid baths, carboxylic acid baths, and the like have been proposed as plating baths used in the tin-zinc alloy plating, and some of them have been put into practical use. [0003] In the conventional methods using these electroplating baths, when processing at a high current density in order to shorten the processing time, rough deposition, yellowing, burning, etc. of the plating occur, and the characteristics of the tin-zinc alloy plating are destroyed. Therefore, The practical application of high-speed electroplating is difficult. In reality, it only stays in the rack platin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/26C25D21/10C25D3/60
CPCC25D21/10C25D3/565C25D3/60C25D5/08
Inventor 汤浅智志
Owner DISPOL CHEMICALS CO LTD
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