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Manufacturing method of tin-copper double-layer electroplated steel plates

A manufacturing method and technology for steel plates, which are applied in the field of manufacturing tin-copper double-layer electroplated steel plates, can solve the problems of poor welding performance of galvanized layers, affecting the processing performance and corrosion resistance of steel plates, etc.

Inactive Publication Date: 2014-12-10
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Prior to this, people have invented many surface treatment methods of steel plates for food and beverage cans that save precious metal tin and improve the corrosion resistance of steel plates. Among them, the most representative method is the manufacturing method of zinc-tin double-layer electroplated steel plates invented by Liu Changfu et al. ( Chinese patent number is ZL.201110115544.9), although this zinc-tin double-layer plated steel plate can also replace pure tin plated steel plate and save tin resources, but this zinc-tin double-layer plated steel plate has two The problem is that the welding performance of the galvanized layer is not very good. Because the tinplate is mainly used to make metal packaging materials such as food and beverage cans and high-pressure aerosol cans, these metal packaging materials such as food and beverage cans and high-pressure aerosol cans are in production Welding is required during the process of the tank. With the improvement of the sealing requirements of the tank body, the welding performance of the steel plate also needs to be further improved.
Second, if the temperature of the zinc coating is too high during the reflow process, it will cause the "powdering" of the zinc coating and affect the processing performance and corrosion resistance of the steel plate.

Method used

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  • Manufacturing method of tin-copper double-layer electroplated steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The ultra-thin cold-rolled steel sheet with a specification of 150×100×0.18mm is first derusted, washed, activated with dilute acid, and then dipped in nickel-containing solution. The formula of the nickel-impregnated solution is: nickel sulfate (NiSO 4 ·6H 2 O)): 30g / L, sodium hypophosphite (NaH 2 PO 2 ·H 2 O): 10g / L, sodium acetate (NaAc·3H 2 O) 10g / L, pH value: 4~6, temperature: 90°C, immersion nickel amount 30~50mg / m 2 , and then wash with water;

[0019] Copper is electroplated on the surface again, and the formula of electroplating copper solution is composed of: copper pyrophosphate (Cu 2 P 2 o 7 ): 65g / L, potassium pyrophosphate (K 4 P 2 o 7.. 3H 2 O): 230g / L, ammonia water: 2mL / L, DK-105 brightener 1mL / L, P 比 (P 2 o 7 4- / C u 2+ ):6.40~7.0, pH value 8.6~9.0, temperature: 50°C, cathode current density: 3A / dm2, anode: oxygen-free electrolytic copper plate, copper plating amount: 1.0 g / m2, copper plating will be finished with water After the surf...

Embodiment 2

[0021] The ultra-thin cold-rolled steel sheet with a specification of 150×100×0.25mm is first derusted, washed, activated with dilute acid, and then dipped in nickel-containing solution. 4 ·6H 2 O)): 30g / L, sodium hypophosphite (NaH 2 PO 2 ·H 2 O): 10g / L, sodium acetate (NaAc·3H 2 O) 10g / L, pH value: 4~6, temperature: 90°C, immersion nickel amount 30~50mg / m 2 , and then wash with water;

[0022] Copper is electroplated on the surface again, and the formula of electroplating copper solution is composed of: copper pyrophosphate (Cu 2 P 2 o 7 ): 95g / L, potassium pyrophosphate (K 4 P 2 o 7.. 3H 2 O): 280g / L, ammonia water: 3mL / L, DK-105 brightener 2mL / L, P 比 (P 2 o 7 4- / C u 2+ ):6.4~7.0, pH value 8.6~9.0, temperature: 55°C, cathode current density: 8A / dm2, anode: oxygen-free electrolytic copper plate, copper plating amount: 1.5g / m2, copper plating will be finished with water After the surface of the thin steel plate is cleaned, it is immediately put into an elec...

Embodiment 3

[0024] The ultra-thin cold-rolled steel sheet with a specification of 150×100×0.3mm is first derusted, cleaned, activated with dilute acid, and first dipped in nickel-containing solution. The formula of the nickel-impregnated solution is: nickel sulfate (NiSO 4 ·6H 2 O)): 30g / L, sodium hypophosphite (NaH 2 PO 2 ·H 2 O): 10g / L, sodium acetate (NaAc·3H 2 O) 10g / L, pH value: 4~6, temperature: 90°C, immersion nickel amount 30~50mg / m 2 , and then wash with water;

[0025] Copper is electroplated on the surface again, and the formula of electroplating copper solution is composed of: copper pyrophosphate (Cu 2 P 2 o 7 ) 105g / L, potassium pyrophosphate (K 4 P 2 o 7.. 3H 2 O): 370g / L, ammonia water: 5mL / L, DK-105 brightener 3mL / L, P 比 (P 2 o 7 4- / C u 2+ ):6.4~7.0, pH value 8.6~9.0, temperature: 60℃, cathode current density: 7A / dm2, anode: anaerobic electrolytic copper plate, copper plating amount: 2.5g / m2, copper plating will be finished with water After the surface ...

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Abstract

The invention discloses a manufacturing method of tin-copper double-layer electroplated steel plates. The technical scheme of the invention is as follows: the method comprises the following steps: carrying out rust removal on a cold rolled thin steel sheet, cleaning the cold rolled thin steel sheet, activating the cold rolled thin steel sheet by using dilute acid, carrying out chemical nickel dipping on the surface of the cold rolled thin steel sheet, sequentially carrying out electrocoppering and electrotinning on the surface of the cold rolled thin steel sheet, and carrying out soft melting, hardening, soda cleaning, chromate cathodic passivating, cleaning and blow-drying on the cold rolled thin steel sheet, so that a finished product is obtained. The method disclosed by the invention is simple in process and low in production cost, and the prepared tin-copper double-layer electroplated steel plate has excellent weldability and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a method for manufacturing a tin-copper double-layer electroplated steel sheet. Background technique [0002] Because tin is non-toxic and harmless to the human body, people use tinplate to make food cans and beverage cans. The earliest tinplate is the method of hot-dip tinning, that is, tin is melted at high temperature and then coated with molten tin. On the surface of the steel plate, the tin plate made by this method is very expensive due to the thick tin layer and poor uniformity. With the advancement of science and technology, people later used electroplating to deposit the tin layer on the surface of the steel plate by electrodeposition. The tin layer of the electroplated tin plate is uniform, and the thickness of the tin layer is greatly reduced compared with hot-dip tin. Its cost has also been greatly reduced, but as users have higher and higher cost requirements...

Claims

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Application Information

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IPC IPC(8): C25D5/10C25D3/38C25D3/30C25D5/36
Inventor 柳长福涂元强蔡捷宋乙峰杜蓉杨洪武白会平黄道兵
Owner WUHAN IRON & STEEL (GROUP) CORP
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