Electroplating current optimization method applicable to continuous electrotinning unit

A technology of electroplating tin unit and optimization method, which can be applied to electrolytic components, electrolytic processes, cells, etc., and can solve problems such as shortening the life of the plates

Inactive Publication Date: 2014-04-02
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its purpose is to provide an electroplating current optimization method to solve the problem of reduced life of the plate caused by repeated power-on and off of the plate when the electroplating current changes. All plates in the tank are powered on and off at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The number of plating tanks is 10, and the total plating channels are 19, of which the first channel of the first plating tank is used for activation.

[0021] The production size specification is 850mm×0.3mm, and the coating thickness is 11.2g / m 2 When plating tin plate, the unit speed is 298m / min, 19 plating channels are required, the total current is 85.5KA, and the current usage rate is 100%.

[0022] The production size specification is 850mm×0.3mm, and the coating thickness is 5.6g / m 2 When tinning the plate, the speed of the unit is 500m / min, the total current is 71.7KA, and the current utilization rate is reduced to 83.9%.

[0023] Adopt the optimization method of the present invention, the electroplating current utilization rate of the 1st~17th pass is reduced to 93.2%, the electroplating current utilization rate of the 18th~19th pass is reduced to 5%, namely (0.932x17+0.05x2) / 19=0.839. This working condition is no different from the allocation scheme of Ja...

Embodiment 2

[0025] The number of plating tanks is 10, and the total plating channels are 19, of which the first channel of the first plating tank is used for activation.

[0026] The production size specification is 850mm×0.3mm, and the coating thickness is 11.2g / m 2 When plating tin plate, the unit speed is 298m / min, 19 plating channels are required, the total current is 85.5KA, and the current usage rate is 100%.

[0027] The production size specification is 750 mm×0.16mm, and the coating thickness is 1.1g / m 2 When the steel coil is used, the speed of the unit is limited by the steel strip strength specification, the maximum speed is 300m / min, the total electroplating current is 7.46KA, and the current utilization rate is reduced to 8.7%. Pick

[0028] Using the method of Japanese patent JP2004131786A, the current distribution scheme reduces the current utilization rate of 19 passes to 8.7%. The current density of each pass is much lower than the diffusion current density, and the pl...

Embodiment 3

[0031] The number of plating tanks is 10, and the total plating channels are 19, of which the first channel of the first plating tank is used for activation.

[0032] The production size specification is 950mm×0.3mm, and the coating thickness is 2.8g / m 2 When tinplate, the unit speed is 500m / min. According to this patent, 9 electroplating channels are set, and the current usage rate is 100%. The production size specification is 850 mm×0.3mm, and the coating thickness is 1.1g / m 2 When the steel coil is used, the maximum speed is 500m / min, the total electroplating current is 15.72KA, and the current utilization rate is reduced to 38.8%. The energizing capacity of the 1st~2nd pass is reduced to 81.1%, and the same amount of electricity is reduced to 5% in the 3rd~9th pass, that is (0.811x4+0.05x5) / 9 =0.388. As a result, the on-off status of all electrodes remains unchanged, ensuring the stability of the electrodes; 92.8% of the tin plating on the surface of the tinplate is el...

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PUM

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Abstract

The invention provides an electroplating current optimization method applicable to a continuous electrotinning unit. The method comprises the following steps: (1) making a steel coil production plan according to plating thickness and carrying out continuous production of steel coils; (2) starting all the electroplating passes of the unit when producing a tin plate with plating thickness of no less than 5.6 g/m<2>, and starting half of the electroplating passes of the unit when producing a tin plate with plating thickness of no more than 2.8 g/m<2>; (3) when changes of plating specifications cause reduction of total current, maintaining the number of started electroplating passes to be unchanged while changing current distribution of each pass to reduce total current for front and rear steel coils with plating thickness in a same divided interval, and halving the number of plating baths while changing current distribution of each pass to reduce total current for front and rear steel coils with plating thickness in different divided intervals; and (4) when speed reduction of the unit causes reduction of total current, maintaining the number of started electroplating passes to be unchanged while changing current distribution of each pass to reduce total current. The method provided by the invention takes high current density distribution principles into consideration, employs a small number of plating baths for thin strip steel and enables distribution current density to be high, thereby guaranteeing electroplating quality.

Description

technical field [0001] The invention relates to an electroplating control method, in particular to an electroplating current optimization method suitable for a continuous electroplating tinning unit. Background technique [0002] The strip steel continuous electro-tinning unit adopts multi-pass electroplating tanks for tinning in series. Each pass is equipped with electroplating electrodes, conductive rollers, and steering rollers. The strip runs continuously between passes for tinning. The amount of tin plating on the surface of the strip is proportional to the total current passed by the electroplating electrodes of each pass when the strip passes through all passes. [0003] The current is calculated and determined by strip width, coating thickness, electroplating efficiency, and unit speed. When the strip width is narrowed, the coating thickness is reduced or the machine speed is reduced, the total current may be reduced. Total current reduction can be achieved by re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D21/12
Inventor 蔡玲贺立红
Owner WISDRI ENG & RES INC LTD
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