Method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy

A nickel-cobalt alloy, electrodeposition technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as research on the influence of nickel-cobalt alloy coatings, and achieve good flatness and tight structure. , the effect of high finish

Inactive Publication Date: 2011-11-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on bidirectional pulse electrodeposition of nickel-cobalt alloys, and no specific research has been done on the influence of double-pulse parameters on nickel-cobalt alloy coatings

Method used

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  • Method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy
  • Method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy
  • Method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) The soluble nickel plate with a purity greater than 99.99% is used as an anode plate after the following treatment: first use coarse sandpaper for preliminary grinding to remove the surface oxide layer, stains, etc., then wash it with distilled water, and after degreasing, use Rinse with distilled water, then clean the surface with absolute ethanol, and dry it with a hair dryer for later use;

[0057] 2) The iron sheet is used as the cathode plate after the following treatment. After the iron sheet is polished and polished with 600#, 1000#, 1200#, 2000# metallographic sandpaper in turn, it is cleaned by chemical degreasing, and then passed through Strong acid descaling, neutralization, weak etching Ⅰ, pre-nickel plating, weak etching Ⅱ, bright sulfate copper plating, weak etching Ⅲ, the process conditions of each surface treatment step are as follows:

[0058] basic component Concentration or Process Conditions sodium hydroxide 75g / L Sodiu...

Embodiment 2

[0104] 1) Treat the soluble nickel plate with a purity greater than 99.99% by the method of step 1) in Example 1 and use it as an anode plate;

[0105] 2) After the iron sheet is processed by the method of step 1) in Example 1, it is used as a cathode plate;

[0106] 3) Prepare the plating solution, the components and their contents in the plating solution are as follows:

[0107] Nickel Sulfate (NiSO 4 ·6H 2 O) 180g / L

[0108] Cobalt Sulfate (CoSO 4 ·6H 2 O) 5g / L

[0109] Sodium Chloride (NaCl) 10 g / L

[0110] Sodium Sulfate (Na 2 SO 4 ) 25~30 g / L

[0111] Boric acid (H 3 BO 3 ) 40g / L

[0112] Sodium formate (HCOONa) 40 g / L

[0113] Formaldehyde (HCHO) 2 g / L

[0114] Saccharin 1g / L

[0115] pH 5~6

[0116] 4) Inject the plating solution prepared in step 3) into the electrodeposition tank, use the soluble nickel plate after surface treatment in step 1) and the iron sheet after surface treatment in step 2) as the anode and cathode respectively, and adopt the dou...

Embodiment 3

[0131] 1) Treat the soluble nickel plate with a purity greater than 99.99% by the method of step 1) in Example 1 and use it as an anode plate;

[0132] 2) The iron sheet is used as a cathode plate after being processed by the method of step 1) in Example 1;

[0133] 3) Prepare the plating solution, the components and their contents in the plating solution are as follows:

[0134] Nickel Sulfate (NiSO 4 ·6H 2 O) 250g / L

[0135] Cobalt Sulfate (CoSO 4 ·6H 2 O) 10g / L

[0136] Sodium Chloride (NaCl) 15 g / L

[0137] Sodium Sulfate (Na 2 SO 4 ) 25~30 g / L

[0138] Boric acid (H 3 BO 3 ) 50g / L

[0139] Sodium formate (HCOONa) 50 g / L

[0140] Formaldehyde (HCHO) 2 g / L

[0141] Saccharin 1g / L

[0142]pH 5~6

[0143] 4) Inject the plating solution prepared in step 3) into the electrodeposition tank, use the soluble nickel plate after surface treatment in step 1) and the iron sheet after surface treatment in step 2) as the anode and cathode respectively, and adopt the doub...

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Abstract

The invention relates to a method for electrodepositing a nanocrystalline nickel-cobalt alloy by double-pulse. The method for electrodepositing the nanocrystalline nickel-cobalt alloy by double-pulse is characterized by comprising the following processing steps: in a plating solution with a pH value of 5-6, a nickel ion concentration of 0.68-0.95 mol / L and a cobalt ion concentration of 1.9*10<-2>to 3.8*10<-2> mol / L, taking a soluble nickel plate after the soluble nickel plate is subjected to surface treating as a anode, taking an iron sheet after the iron sheet is subjected to surface treating as a cathode and electroplating a nanocrystalline nickel-cobalt alloy layer by using double-pulse electrodepositing technology, wherein the time for electrodepositing is 15-20 min, the positive-going pulse current density is 1.0-2.0 A / dm<2>, the positive-going duty ratio is 60-80%, the working time of the positive-going pulse is 50-100 ms and the positive-going cycle is 40-60 ms; and the negative-going pulse current density is 0.1-0.2 A / dm<2>, the negative-going duty ratio is 60-80%, the working time of the negative-going pulse is 10-20 ms, the negative-going cycle is 1-2 ms and the workingtime of the positive-going pulse is 5-10 times of that of the negative-going pulse. The nickel-cobalt alloy coating prepared by the method has the advantages of smooth surface, compact structure, fine and even crystal, good smoothness, no crack and excellent corrosion resistance.

Description

technical field [0001] The invention relates to a method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy, which belongs to the field of electroplating alloys. technical background [0002] Surface treatment engineering (technology) has developed rapidly in recent years. Electroplating technology is one of the most effective methods in surface treatment engineering, and it is widely used. However, for a long time in the past, it was mainly used for electroplating single metal coatings, which is far from meeting the needs of modern industry and scientific and technological development. Alloy coatings composed of different metals have many excellent properties and can often meet the requirements of various special properties. For example, the surface material obtained by electroplating nickel alloy is much more colorful than the various surface properties obtained by plating single metal nickel. [0003] Alloy coatings have many special properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/18C25D3/56B82Y40/00B82Y30/00C25C1/24
CPCY02P10/20
Inventor 葛文杨倩程文
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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