Preparation method of tin-plated plate and application of tin-plated plate prepared by preparation method

A technology of tin-plate and electro-tin plating, which is applied in the field of iron and steel smelting, can solve the problems of alloying pure tin and base iron, few applications of extremely low tin products, and poor welding performance, so as to promote grain growth, good bonding force, The effect of improving uniformity

Active Publication Date: 2018-12-07
SHOUGANG CORPORATION
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a revolutionary innovation in the field of metal packaging, coated iron has received great attention. At present, most of the substrates for coated iron are chrome-plated plates. Chromium-plated plates have advantages over tin-plated plates in terms of manufacturing cost and bonding force with PET films. However, the welding performance is poor, and it is only widely used in top and bottom covers and two-piece cans
However, the technology of applying tin p...

Method used

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preparation example Construction

[0017] The present invention solves the defects of the existing production process of the tinplate with extremely low tin content and its application in coated iron by providing a preparation method of the tinplate and the application of the tinplate thus prepared.

[0018] In order to solve the above problems, the main ideas of the embodiments of the present invention are:

[0019] The preparation method of the tinplate according to the embodiment of the present invention comprises the following steps: the steel strip is electroplated, reflowed, passivated and oiled in sequence to obtain the finished product;

[0020] Wherein, in the tin electroplating process, the current density of the first pass and the last pass is 10-20A / dm 2 , the middle pass current density is 5~10A / dm 2 ;

[0021] The pure induction reflow process is adopted in the reflow process, the reflow temperature in the reflow process is 240-245°C, and the reflow time is 0.5-1.5s;

[0022] In the passivation...

Embodiment 1

[0033]Adopt one-time cold-rolling cover stripping T-3BA, thickness specification 0.35mm, width specification 980mm, sequentially undergoes lye spray cleaning, electrolytic alkali cleaning, electro-tin plating process, rinsing and squeezing, reflow, water quenching, passivation, rinsing, Drying, oiling, coiling to get the finished product; among them, the running speed of the strip steel in the electroplating process section is 280m / min, put into use for 3 passes and 6 pieces of soluble anodes, the upper and lower surfaces are consistent with the control of 3 rectifiers, and the current density is 10A / dm 2 +8A / dm 2 +10A / dm 2 mode, Sn 2+ The concentration is 20g / L, and the measured electroplating efficiency is 87%. In the reflow section, the reflow temperature is 240°C, the reflow time is 1s, the water quenching temperature is 85°C, and the passivation charge density in the passivation process section is set to 3As / dm 2 , the measured concentration of sodium dichromate is 28g / ...

Embodiment 2

[0035] Thin secondary cold-rolled sheet DR-7M BA is used, with a thickness specification of 0.23mm and a width specification of 950mm. It undergoes lye spray cleaning, electrolytic alkaline cleaning, electro-tin plating process, rinsing and squeezing, reflow melting, water quenching and passivation in sequence. , rinsing, drying, and oiling, in which the electroplating process section runs at a speed of 300m / min, put into use 6 pieces of soluble anodes in 3 passes, and the upper and lower surfaces are consistent with 3 rectifiers for control, and the current density is 13A / dm 2 +5A / dm 2 +13A / dm 2 mode, Sn 2+ The concentration is 22g / L, the measured plating efficiency is 90%; the reflow temperature in the reflow process section is 245°C, the reflow time is 0.84s, and the water quenching temperature is 90°C; then the passivation charge density in the passivation process section is set to 4As / dm 2 , the measured concentration of sodium dichromate is 28g / L, the pH is 4.2, the te...

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Abstract

The invention provides a preparation method of a tin-plated plate and an application of the tin-plated plate prepared by the preparation method. The preparation method comprises the following steps that a strip steel sequentially undergoes tin plating, soft melting, passivation and oil coating to obtain a finished product, wherein in the tin plating process, the current density of the first pass and the last pass is 10-20 A/dm<2>, and the current density of the middle pass is 5-10 A/dm<2>, in the soft melting process, a pure induction soft melting process is adopted, the temperature of soft melting is 240-245 DEG C in the soft melting process, the soft melting time is 0.5-1.5 s, and in the passivation process, a sodium dichromate solution with the concentration being 27-31 g/L is used as apassivation solution. Through the preparation method, the tin-plated plate which is uniform in coating, good in welding performance, good in binding force with a PET film and extremely low in tin quantity is prepared, and the tin-plated plate can be used for replacing a chromium plated plate to be applied to the coated iron.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a preparation method of a tinplate and an application of the tinplate thus prepared. Background technique [0002] As a revolutionary innovation in the field of metal packaging, coated iron has received great attention. At present, most of the substrates for coated iron are chrome-plated plates. Chrome-plated plates have advantages over tin-plated plates in terms of manufacturing cost and bonding force with PET films. However, the welding performance is poor, and it is only widely used in top and bottom covers and two-piece cans. However, the technology of applying tin plate instead of chrome plate to coated iron is not mature at present, and the specification range of tin coating amount of conventional tin plate is generally 1.1g / m 2 ~11.2g / m 2 , while the amount of tin plating is less than 1.1g / m 2 The application of ultra-low tin products is stil...

Claims

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Application Information

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IPC IPC(8): C25D3/30C25D5/50C25D5/48C25D7/06C25D11/38
CPCC25D3/30C25D5/48C25D5/505C25D7/0614C25D11/38
Inventor 宋浩方圆王雅晴石云光吴志国孙超凡崔阳黄学启莫志英朱防修李海旭刘伟王振文孙宇
Owner SHOUGANG CORPORATION
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