Method of preparing copper-zinc-copper composite coating with high corrosion resistance on surface of low-carbon steel

A technology of high corrosion resistance and composite coating, applied in the field of anti-corrosion treatment of metal material surface, can solve the problems of poor corrosion resistance, uneven coating, many pores, etc., to improve corrosion resistance, fast electrodeposition, simple operation Effect

Active Publication Date: 2016-07-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing low carbon steel surface electroplating methods have problems such as uneven coating, many pores, poor quality, and poor corrosion resistance.

Method used

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  • Method of preparing copper-zinc-copper composite coating with high corrosion resistance on surface of low-carbon steel

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Embodiment 1

[0016] A method for preparing a highly corrosion-resistant copper-zinc-copper composite coating on the surface of low-carbon steel of the present invention is characterized in that the method steps include:

[0017] (1). Degreasing the surface of low carbon steel: first prepare a degreasing solution with a concentration of 30g / LNaOH and 10g / L zinc powder, heat it to 35-50°C, and put the low carbon steel into the above degreasing solution Carry out degreasing, the degreasing time is 20-40min, take it out, then rinse with deionized water, then remove the residue of surface oxide, rinse with deionized water, and obtain the pretreated low carbon steel;

[0018] (2). The low carbon steel after the above-mentioned step (1) pretreatment is carried out pulse copper-plating electroplating treatment: first prepare pulse copper-plating electroplating solution; The component of described pulse copper-plating electroplating solution is: copper sulfate 100g / L, sulfuric acid 20g / L, sodium ch...

Embodiment 2

[0024] Present embodiment 2 is basically the same as above-mentioned embodiment 1 method, and difference is, the step (2) described in present embodiment 2 described in step (2) to the preparation pulse copper-plating electroplating solution, galvanized electroplating solution, The components of alkaline copper-plating electroplating solution, copper-plating electroplating solution and their electroplating process parameters are as follows:

[0025] Pulse copper-plating electrolyte components described in step (2): copper sulfate 200g / L, sulfuric acid 40g / L, sodium chloride 0.02g / L, 209 cylinder opener A0.3ml / L, 209 cylinder opener B0 .3ml / L, 209 cylinder opening agent C8.0ml / L; electroplating process parameters: electroplating current intensity: 4A / dm 2 , temperature: 35°C, plating time: 10min;

[0026] Components of the galvanized electroplating solution described in step (3): zinc sulfate 220g / L, boric acid 16g / L, SZ-97 brightener 16ml / L; electroplating process parameters:...

Embodiment 3

[0030] Present embodiment 3 is basically the same as above-mentioned embodiment 1 method, difference is, the preparation pulse copper-plating electroplating solution, galvanized electroplating solution, The components of alkaline copper-plating electroplating solution, copper-plating electroplating solution and its electroplating process parameters are as follows: the pulse copper-plating electroplating solution component described in step (2): copper sulfate 220g / L, sulfuric acid 55g / L, chlorine Sodium chloride 0.03g / L, 209 cylinder opener A0.5ml / L, 209 cylinder opener B0.5ml / L, 209 cylinder opener C9.0ml / L; electroplating process parameters: electroplating current intensity: 8A / dm 2 , temperature: 20°C, plating time: 10min;

[0031] The components of the galvanized electroplating solution described in step (3): zinc sulfate 250g / L, boric acid 15g / L, SZ-97 brightener 15ml / L; electroplating process parameters: electroplating current intensity: 3A / dm 2 , temperature: 25°C, pla...

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Abstract

The invention discloses a method of preparing a copper-zinc-copper composite coating with high corrosion resistance on the surface of low-carbon steel. The method comprises the following steps of: (1) carrying out oil removal treatment on the surface of the low-carbon steel; (2) carrying out pulse copper plating electroplating treatment on the pretreated low-carbon steel; (3) carrying out electrogalvanizing electroplating treatment on the low-carbon steel subjected to pulse copper plating; (4) carrying out alkaline copper plating electroplating treatment on the low-carbon steel subjected to electrogalvanizing; (5) carrying out electrocoppering electroplating treatment on the low-carbon steel subjected to alkaline copper plating; and (6) putting the low-carbon steel subjected to electrocoppering in an alloying furnace, and alloying the low-carbon steel in a protective nitrogen atmosphere, wherein the alloying temperature is 250-400 DEG C, and the heating rate is 0.01-50 DEG C / S; carrying out heat preservation for 2 to 50 hours, then carrying out fast cooling to a room temperature, wherein the cooling rate is 0.01-50 DEG C / S; and finally obtaining the copper-zinc-copper composite coating with the high corrosion resistance on the surface of the low-carbon steel. The copper-zinc-copper composite coating prepared on the surface of the low-carbon steel by using the method is uniform and compact and can obviously improve the corrosion resistance of metals. The method has the advantages of simple operation, large electric current density and fast electrodeposition rate.

Description

technical field [0001] The invention relates to a method for preparing a high-corrosion-resistant copper-zinc-copper composite coating on the surface of low-carbon steel, and belongs to the technical field of anti-corrosion treatment on the surface of metal materials. Background technique [0002] Copper and its plating have excellent electrical conductivity, thermal conductivity and solderability, and are widely used in instrumentation and electronics industries, but are prone to severe corrosion in high humidity or corrosive media (such as oxygen-containing air, seawater) , limiting its further application. In this regard, research on the corrosion resistance of copper or copper alloys has been vigorously carried out at home and abroad, but most of them focus on the corrosion resistance of copper or copper alloys themselves, and relatively few studies on the corrosion resistance of copper coatings. Copper plating is more and more widely used, but it is mixed with various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D5/18C25D3/38C25D3/22C25D5/36C25D5/50
CPCC25D3/22C25D3/38C25D5/10C25D5/18C25D5/36C25D5/50
Inventor 钟庆东孙金虎任帅东李辉张俊良赵启亮
Owner SHANGHAI UNIV
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