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Manufacturing method of zinc-nickel double-layer electroplating steel plate

A manufacturing method and technology for steel plates, which are applied in the field of manufacturing zinc-nickel double-layer electroplated steel plates, can solve the problems of poor adhesion between the coating and the substrate, waste of resources, and peeling of the coating, and achieve good deep-drawing processing performance, good adhesion, and durability. The effect of improving the corrosion performance

Inactive Publication Date: 2010-09-01
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in hot-dip galvanizing: first, the uniformity of the coating is difficult to control, the coating is generally thick, consumes more resources, and causes waste of resources; causing plating to fall off
[0004] But the products of these methods can only focus on solving the problems of a certain aspect in the corrosion resistance of the coating or the bonding force of the coating and the substrate or surface coating, and cannot both improve the corrosion resistance of the coating and solve the problem of the coating and the coating simultaneously. The problem of the bonding force between the substrate and the surface coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The sample is an ordinary cold-rolled steel plate with a size of 200×200×0.5mm. The preparation steps are as follows:

[0020] 1) The cold-rolled steel plate is derusted and washed with water;

[0021] 2) activating the steel plate with 10% dilute hydrochloric acid by weight;

[0022] 3) The steel plate after activation is sent into the electroplating tank for electroplating nickel, the composition of this nickel plating solution is: nickel sulfate: 250g / L, nickel chloride: 45g / L, boric acid: 35g / L, acetic acid: 2g / L, pH4~4.5, temperature control is 45℃, cathode current density is 2A / dm 2 , the amount of nickel plating is controlled as: 0.4g / m 2 ;

[0023] 4) Then annealing is carried out at a temperature of 550° C. During annealing, nitrogen is added as a protective gas in the furnace to prevent oxidation of the steel plate; the annealing time is 0.3 hours to form an iron-nickel alloy layer on the surface of the steel plate.

[0024] 5) Electro-galvanizing on the s...

Embodiment 2

[0027] The sample is an ordinary hot-rolled steel plate with a size of 200×200×1.8mm. The preparation steps are as follows:

[0028] 1) Descale the hot-rolled steel plate and wash it with water;

[0029] 2) activating the steel plate with 10% dilute hydrochloric acid by weight;

[0030] 3) The steel plate after activation is sent into the electroplating tank for electroplating nickel, and the composition of this nickel plating solution is: nickel sulfate: 240g / L, nickel chloride: 65g / L, boric acid: 25g / L, acetic acid: 1g / L, pH4~4.5, temperature control is 50℃, cathode current density is 5A / dm 2 , the amount of nickel plating is controlled as: 1.8g / m 2 ;

[0031] 4) Then, annealing is carried out at a temperature of 650°C. During annealing, hydrogen is added in the furnace as a protective gas to prevent oxidation of the steel plate; the annealing time is 1 hour, so as to form an iron-nickel alloy layer on the surface of the steel plate.

[0032] 5) Galvanized on the surface...

Embodiment 3

[0035] The sample is an ordinary cold-rolled steel plate with a size of 200×200×1.2mm. The preparation steps are as follows:

[0036] 1) The cold-rolled steel plate is derusted and washed with water;

[0037] 2) activating the steel plate with 20% dilute sulfuric acid by weight;

[0038] 3) Put the activated steel plate into the electroplating tank for electroplating nickel, the composition of the nickel plating solution is: nickel sulfate: 280g / L, nickel chloride: 40g / L, boric acid: 40g / L, acetic acid: 3g / L, pH4 .5, the temperature is controlled at 45°C, and the cathode current density is 3A / dm 2 , the amount of nickel plating is controlled as: 1.2g / m 2 ;

[0039] 4) Then, annealing is carried out at a temperature of 600°C. During annealing, hydrogen is added in the furnace as a protective gas to prevent oxidation of the steel plate; the annealing time is 2 hours to form an iron-nickel alloy layer on the surface of the steel plate.

[0040] 5) Galvanizing the surface of t...

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Abstract

The invention discloses a manufacturing method of a zinc-nickel double-layer electroplating steel plate, which comprises the following steps: derusting a cold rolled steel plate or descaling a hot rolled steel plate, and cleaning the steel plate with water; activating the cleaned steel plate with diluted acid; electronickelling the activated steel plate, wherein a nickelling solution comprises the components of 240-280g / L of nickel sulfate, 40-65g / L of nickel chloride, 25-45g / L of boric acid and 1-3 g / L of acetic acid, and the pH value is controlled to be 4-4.5; annealing the steel plate by using hydrogen gas or nitrogen gas as a protective gas at the temperature of 550-650 DEG C, and forming a ferronickel alloy layer on the surface of the steel plate; then, electrogalvanizing the surfaceof the ferronickel alloy layer, wherein a galvanizing solution comprises the components of 250-300g / L of zinc sulfate, 1-2g / L of aluminum sulfate, 240-260g / L of sodium sulfate, 20-25g / L of boric acidand 2-3g / L of glucose, and the pH value is controlled to be 4.5-5.5; and washing the galvanized steel plate with water to acquire a finished product. Tests indicate that the corrosion resisting property of the acquired steel plate can be greatly improved, and a bonding force problem of a plating layer and a basal body is also solved.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a method for manufacturing a zinc-nickel double-layer electroplated steel sheet. Background technique [0002] For steel sheets used in automobiles and home appliances, in order to improve their corrosion resistance, hot-dip galvanizing and electro-galvanizing are mostly used at home and abroad. However, there are problems in hot-dip galvanizing: first, the uniformity of the coating is difficult to control, the coating is generally thick, consumes more resources, and causes waste of resources; cause the coating to fall off. Although electro-galvanizing solves the problem of uniformity and bonding force of the coating, the corrosion resistance is still poor. [0003] Before the present invention, there were already some zinc-nickel alloy electroplating method patents or documents to improve the performance of electroplated steel sheets, such as the Japanese pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/12C25D5/26
Inventor 柳长福涂元强黄先球白会平任予昌
Owner 武钢集团有限公司
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