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Nickel-base composite cladding for preventing cold-welding effect under high vacuum environment and its plating process

A composite coating, high vacuum technology, applied in coatings, electrolytic coatings, etc., can solve the problems of high film preparation cost, harsh process conditions, high price, etc., and achieve the effect of low friction coefficient, pollution-free production process and low price

Inactive Publication Date: 2007-03-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods have a common disadvantage, that is, the required equipment is complicated, the process conditions are harsh and the preparation cost of the film is high.
Taking magnetron sputtering as an example, in the preparation of MoS 2 The molybdenum target used in thin film requires extremely high purity (>99.99%) and is very expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After the aluminum alloy is degreased, alkaline etched and acid etched, the electroless nickel is deposited by secondary zinc immersion and pre-plating, and then the Ni-P composite containing nano-molybdenum disulfide is plated on the aluminum substrate by electroless plating. plating. Its plating method is as follows:

[0018] (1) Preparation of chemical plating solution consists of: nickel sulfate 25g / L, sodium hypophosphite 20g / L, sodium acetate 20g / L, sodium citrate 30g / L, lactic acid 5ml / L, nano molybdenum disulfide 5g / L , adjust the pH value of plating solution with acetic acid, pH=4.5;

[0019] (2) Degreasing, activation, and pre-plating of plated parts;

[0020] (3) The plating solution is heated to 90°C, and the plating time is 0.2 to 1 hour.

[0021] The friction coefficient of the coating is 0.018-0.028, while the friction coefficient of the MoS2 thin film obtained by sputtering is 0.01-0.04.

Embodiment 2

[0023] After the amorphous alloy is deoiled and acid-etched, the Ni-P composite coating containing nano-molybdenum disulfide is plated on the Zr-based bulk amorphous alloy substrate by electroless plating. Its plating method is as follows:

[0024] (1) prepare electroless plating solution and its composition is: nickel sulfate 22g / L, sodium hypophosphite 25g / L, sodium acetate 20g / L, sodium citrate 35g / L, lactic acid 6ml / L, nanomolybdenum disulfide 5g / L ; Adjust the pH value of the plating solution with acetic acid (ammonium sulfate) and sodium acetate (ammonia liquor), pH=8;

[0025] (2) Degreasing, activation, and pre-plating of plated parts;

[0026] (3) The plating solution is heated to 90°C, and the plating time is 0.2 to 1 hour.

[0027] The friction coefficient of the coating is 0.02-0.04, and the MoS obtained by sputtering 2 The friction coefficient of the film is in the range of 0.01 to 0.04.

Embodiment 3

[0029] After the aluminum alloy is degreased, alkaline etched and acid etched, it is electroless nickel deposited by secondary zinc dipping and pre-plating, and then Ni-P containing nano-molybdenum disulfide is plated on the aluminum substrate by a composite electrodeposition method. Composite coating. The electroplating method is as follows:

[0030] (1) Prepare electroplating solution and its composition is: nickel sulfate 210g / L, nickel chloride 20g / L, sodium hypophosphite 15g / L, sodium sulfate 50g / L, nano molybdenum disulfide 10g / L; Adjust with sulfuric acid and ammoniacal liquor The pH value of the plating solution, pH=2~4;

[0031] (2) Degreasing, activation, and pre-plating of plated parts;

[0032] (3) The bath is heated to 55-60°C, and the cathode current density is 1A / dm 2 Next, the plating time is 0.2 to 1 hour.

[0033] The friction coefficient of the coating is 0.028-0.035, and the MoS obtained by sputtering 2 The friction coefficient of the film is in the ra...

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Abstract

The invention discloses a cold welding effect proofing nickel base composite plating in high vacuum environment and the coating technology. It adopts chemical composite plating or composite electrodeposition to make nickel base composite plating containing nanometer molybdenum disulfide in plate, and containing 2-30g / L nanometer molybdenum disulfide in chemical bath and electric bath. It has wide application prospect in navigation, mechanical, chemical industrial filed, and it has the advantages of simple technology, low price, low device cost and non pollution.

Description

technical field [0001] The invention relates to the surface plating of bulk amorphous alloys or aluminum alloys and the like with metal materials, in particular to a nickel-based composite plating layer and a plating process thereof for preventing cold welding effects in a high vacuum environment. Background technique [0002] The space pressure that the spacecraft bears during its operation in the high orbit of space is 10 -11 Pa level, and the space pressure it endures during its operation in low-Earth orbit is at 10 -5 ~10 -7 The range of Pa level, corresponding to the vacuum degree in the cabin is 10 -4 Pa level. Studies have shown that in the above-mentioned high-vacuum environment, the metal surfaces of two clean mechanical parts in contact with each other are very prone to adhesion, and because the frictional heat is difficult to dissipate, the temperature rise of the contact interface is very high, and high temperature (including ambient temperature) liters) and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/16C25D15/00
Inventor 于金库马明臻刘日平
Owner YANSHAN UNIV
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