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Pure nickel or nickel-based alloy plating layer with nano twin crystal structure and electro-deposition preparation method of pure nickel or nickel-based alloy plating layer

A nano-twin, nickel-based alloy technology, applied in the field of pure nickel or nickel-based alloy plating and its electrodeposition preparation, to achieve the effects of high versatility, unique microstructure, and excellent mechanical properties

Active Publication Date: 2021-01-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on the electrodeposition of nickel and nickel-based alloys from citrate solutions is still in its infancy, and there are almost no literature and patent reports on the preparation of nano-twinned nickel and nickel-based alloys by electrodeposition from citrate-containing solutions.

Method used

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  • Pure nickel or nickel-based alloy plating layer with nano twin crystal structure and electro-deposition preparation method of pure nickel or nickel-based alloy plating layer
  • Pure nickel or nickel-based alloy plating layer with nano twin crystal structure and electro-deposition preparation method of pure nickel or nickel-based alloy plating layer
  • Pure nickel or nickel-based alloy plating layer with nano twin crystal structure and electro-deposition preparation method of pure nickel or nickel-based alloy plating layer

Examples

Experimental program
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Effect test

Embodiment 1

[0041] In this embodiment, a citrate system plating solution is used to electrodeposit a nano-twinned pure nickel coating.

[0042] Electrodeposition equipment: DC power supply.

[0043] Electrolyte raw material composition: 400g / L nickel sulfate hexahydrate, 40g / L nickel chloride hexahydrate, 40g / L sodium citrate dihydrate; additives are sodium lauryl sulfate 0.05g / L, sodium saccharin 2.0g / L , 1,4 butynediol 0.64g / L; the above reagents were all dissolved in deionized water, stirred and dissolved and then filtered through filter paper; then the pH value was adjusted to 6.0 with NaOH and sulfuric acid solution with a concentration of 10wt.%.

[0044] Cathode and anode requirements: the anode is a pure nickel plate with a purity of 99.6wt.%, and the cathode is a nickel substrate after surface degreasing and sensitization treatment.

[0045] 2) Electrolysis process parameters: DC current density is 60mA / cm 2 , the electrolyte temperature is 60±1°C, the area ratio of cathode and...

Embodiment 2

[0052] This embodiment adopts citrate system plating solution to electrodeposit nano-twin crystal pure nickel coating:

[0053] Electrodeposition equipment: DC power supply

[0054] Electrolyte raw material composition: 200g / L nickel sulfate hexahydrate, 60g / L nickel chloride hexahydrate, 10g / L sodium citrate dihydrate; additives are sodium lauryl sulfate 0.06g / L, sodium saccharin 2.0g / L , 0.74g / L of 1,4 butynediol, 0.07g / L of glacial acetic acid; the above reagents were all dissolved in deionized water, stirred and dissolved, and then filtered through filter paper; then the pH value was adjusted to 6.7;

[0055] Cathode and anode requirements: the anode is a pure nickel plate with a purity of 99.6wt.%, and the cathode is a nickel substrate after surface degreasing and sensitization treatment.

[0056] 2) Electrolysis process parameters: DC current density is 70mA / cm 2 , the temperature of the electrolyte is 65±1°C, the area ratio of cathode and anode is 1:50, the distance ...

Embodiment 3

[0059] In this embodiment, a citrate system plating solution is used to electrodeposit a nano-twinned pure nickel coating.

[0060] Electrodeposition equipment: DC power supply

[0061] Electrolyte raw material composition: 120g / L nickel sulfate hexahydrate, 20g / L nickel chloride hexahydrate, 60g / L sodium citrate dihydrate; additives are sodium lauryl sulfate 0.05g / L, sodium saccharin 1.0g / L , 1,4 butynediol 0.64g / L; the above reagents were all dissolved in deionized water, stirred and dissolved, and filtered through filter paper; then the pH value was adjusted to 6.4 with 10% NaOH and sulfuric acid solution;

[0062] 2) Electrolysis process parameters: DC current density is 80mA / cm 2 , the electrolyte temperature is 60±1°C, the area ratio of cathode and anode is 1:50, the distance between cathode and anode is 60mm, the electrolyte is stirred by magnetic force, the stirring speed is 1500r / min, and the electrodeposition time: 6h.

[0063] 3) This process can produce a columna...

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Abstract

The invention discloses a pure nickel or nickel-based alloy plating layer with the nano twin crystal structure and an electro-deposition preparation method of the pure nickel or nickel-based alloy plating layer, and belongs to the technical field of preparation of nano crystal metal materials and plating protection. The plating solution adopts a citrate system and mainly comprises nickel source-nickel sulfate, an alloy source (sodium molybdate or cobalt sulfate or copper sulfate), a complexing agent-sodium citrate, an additive, and the balance water; and the pure nickel and nickel alloy plating prepared through direct-current electrodeposition are both composed of columnar crystal particles, the columnar crystal particles internally contain high-density twin crystal sheet layers arranged in parallel, the average thickness of the twin crystal sheet layers ranges from 1.0 nanometer to 100 nanometers, the nano twin crystal nickel / nickel-based alloy plating has high hardness and high thermal stability, under the condition of room temperature, the Vickers hardness value of the pure nickel plating layer is 2.0-8.5 GPa, and the maximum structure roughening temperature can exceed 600 DEG C, the Vickers hardness value of the nickel-based alloy plating is 4.0-8.5 GPa, and the structure roughening temperature is higher than 400 DEG C.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-crystalline metal materials and coating protection, in particular to a pure nickel or nickel-based alloy coating with a nano-twin structure and an electrodeposition preparation method thereof. Background technique [0002] Nickel and nickel alloys (such as nickel-phosphorus, nickel-molybdenum and nickel-tungsten alloys) are bright silver-white metals, which are easily passivated in the air, have good chemical stability, and are not affected by water, atmosphere and alkali at room temperature. erosion. In addition, nickel and nickel alloys have the advantages of high hardness, good wear resistance and good ductility. Therefore, nickel and nickel alloy coatings are one of the most widely used surface coatings, and are widely used in automobiles, bicycles, instruments, medical appliances, stationery and daily hardware. [0003] In recent years, nano-twinned materials have attracted exte...

Claims

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Application Information

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IPC IPC(8): C25D3/16C25D3/56C25D5/08C25D5/40
CPCC25D3/16C25D3/562C25D5/08C25D5/40
Inventor 段峰辉潘杰李毅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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