Preparation method of nano-crystalline zinc plating layer by using direct current electrodeposition

A technology of zinc coating and direct current, applied in the field of surface engineering and surface treatment, to achieve the effect of fine grain, small investment and short deposition time

Inactive Publication Date: 2010-05-19
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared with pulse electrodeposition, DC electrodeposition has the characteristics of small investment and easy industrialization. It has been applied in continuous galvanizing production such as automobile steel sheets. However, it is still difficult to DC electrodeposit nanocrystalline zinc coatings in sulfate solutions.

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  • Preparation method of nano-crystalline zinc plating layer by using direct current electrodeposition
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  • Preparation method of nano-crystalline zinc plating layer by using direct current electrodeposition

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Embodiment 1

[0018] The preparation process and steps in this embodiment are as follows:

[0019] a. First prepare the acidic sulfate bath, 350g of ZnSO 4 ·7H 2 O was dissolved in distilled water to prepare 1L of plating solution, adding concentrated sulfuric acid to adjust the pH value to 2;

[0020] b. Then add CTAB, BA and PEG three additives one by one to the prepared ZnSO 4 In the solution; the concentration of various additives is 0.5g / L, and the temperature of the plating solution is 25°C;

[0021] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the carbon steel sheet of the material to be plated is used as the cathode, and the platinum sheet is used as the anode, and 1A / cm 2 DC current, electroplating 3min; such as figure 1 As shown in (a), the XRD diffraction peaks of the zinc coating have been significantly broadened, and the (101) random orientation can be calculated by usin...

Embodiment 2

[0023] The preparation process and steps in this embodiment are as follows:

[0024] a. First prepare the acidic sulfate bath, with 200g of ZnSO 4 ·7H 2 O was dissolved in distilled water to prepare 1L of plating solution, and concentrated sulfuric acid was added to adjust the pH value to 1;

[0025] b. Then add CTAB, BA and PEG three additives one by one to the prepared ZnSO 4 In the solution; the concentration of various additives is 2g / L, and the temperature of the plating solution is 60°C;

[0026] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the carbon steel sheet of the material to be plated is used as the cathode, and the platinum sheet is used as the anode, and 2A / cm 2 DC current, electroplating 1min; such as figure 1 As shown in (b), the XRD diffraction peaks of the zinc coating have been significantly broadened and are (101) random orientation. The average gra...

Embodiment 3

[0028] The preparation process and steps in this embodiment are as follows:

[0029] a. First prepare the acidic sulfate bath, 100g of ZnSO 4 ·7H 2 O was dissolved in distilled water to prepare 1L of plating solution, and concentrated sulfuric acid was added to adjust the pH value to 4;

[0030] b. Then add CTAB, BA and PEG three additives one by one to the prepared ZnSO 4 In the solution; the concentrations of various additives are 0.5, 1 and 3g / L respectively, and the temperature of the plating solution is 25°C;

[0031] c. Electrodeposition is carried out by DC electroplating method; in the electroplating tank filled with the above-mentioned sulfate plating solution, the carbon steel sheet to be plated is used as the cathode, and the platinum sheet is used as the anode, and 3.5A / cm 2 DC current, electroplating 1min; such as figure 1 As shown in (c), the XRD diffraction peaks of the zinc coating have been significantly broadened and are (101) random orientation. The aver...

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Abstract

The invention belongs to the technical field of surface engineering and surface treatment, in particular providing a preparation method of a nano-crystalline zinc plating layer by using direct current electrodeposition. The preparation method is characterized by taking acidic zinc sulfate solution as a base plating solution, adopting three organics of cetyl trimethyl ammonium bromide (CTAB), benzylidene acetone (BA) and polyethylene glycol (PEG) as mixed additives for remarkably increasing the cathodic polarization of zinc deposition; and applying direct current for deposition by taking carbon plated steel as a cathode and insoluble electrode as an anode with the application of the direct current electrodeposition method, wherein current density is 0.5-4 A/cm2, and electroplating time is 1-6 minutes. By adopting the invention, the zinc plating layer with a luminant and smooth surface and the size of a crystalline grain less than 50 nm.

Description

technical field [0001] The invention relates to a method for preparing a nanocrystalline zinc coating by DC electrodeposition in an acidic zinc sulfate aqueous solution, and belongs to the technical field of surface engineering and surface treatment. Background technique [0002] Corrosion of metal materials such as iron and steel pervades all fields of the national economy and has attracted much attention. It will not only consume a lot of precious resources and energy, bring huge economic losses, but also cause catastrophic accidents. In order to prevent steel components from being damaged by corrosion, people often apply metal coatings such as zinc on the surface of steel to play the role of anode sacrificial protection and shield the corrosive medium. As one of the most commonly used and effective protective coatings, zinc coatings have been widely used in automotive steel sheets, steel wires and other fields. [0003] Due to the nanocrystalline zinc coating, its surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 李谋成伍玉琴邬明钰李伟华阮伟慧
Owner SHANGHAI UNIV
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