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Method for preparing high-temperature-resistant nanocrystalline nickel-cobalt coating on surface of copper alloy

A nickel-cobalt coating and copper alloy technology, applied in the field of electrodeposition, can solve the problems of cumbersome double-pulse electrodeposition operation, unsuitable for large-scale application, and no obvious improvement in hardness, and achieves reduction of hydrogen evolution, good high-temperature mechanical properties and high temperature. The effect of high mechanical properties and hardness

Active Publication Date: 2018-06-08
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Application Information

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Problems solved by technology

However, this method does not significantly improve the hardness of the nickel-cobalt alloy coating, especially at high temperatures; more importantly, the double-pulse electrodeposition operation is cumbersome and the conditions are harsh, which is not suitable for large-scale applications

Method used

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  • Method for preparing high-temperature-resistant nanocrystalline nickel-cobalt coating on surface of copper alloy
  • Method for preparing high-temperature-resistant nanocrystalline nickel-cobalt coating on surface of copper alloy

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Embodiment 1）

[0020] The method for preparing a high-temperature-resistant nanocrystalline nickel-cobalt coating on the copper alloy surface of the present embodiment has the following steps:

[0021] ① Grinding.

[0022] Use 200#, 400#, 800# sandpaper in turn to polish the surface of the copper alloy smooth, then use absolute ethanol to sonicate, and finally rinse with deionized water and dry.

[0023] ②Electric net degreasing.

[0024] The copper alloy connected to the negative pole of the power supply as the cathode is placed in a deposition tank filled with electrolytic solution and moved back and forth to remove rust and oil stains on the surface of the copper alloy.

[0025] The formula of the electric cleaning solution is as follows: sodium hydroxide 30g / L, sodium carbonate 28g / L, sodium phosphate 90g / L, sodium chloride 3g / L, pH=12.

[0026] Electro-cleaning process parameters are as follows: current density is 10A / dm 2 , The electric cleaning time is 60s.

[0027] ③ strong activ...

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Abstract

The invention discloses a method for preparing a high-temperature-resistant nanocrystalline nickel-cobalt coating on the surface of a copper alloy. The method comprises is characterized in that high-temperature-resistant nanocrystalline nickel-cobalt coating is prepared by adopting a free particle-assisted friction electrodeposition technology; the free particle-assisted friction electrodepositiontechnology is characterized in that ZrO2 ceramic particles are added into a deposition tank filled with an acid deposition solution, and then the copper alloy serving as the cathode is placed in thedeposition tank for reciprocating movement, so that the nickel-cobalt coating is deposited on the surface of the copper alloy; the formula of the acid deposition solution is characterize in that nickel sulfate is 220-250g / L, cobalt sulfate is 30-50g / L, nickel chloride is 45-60g / L, boric acid is 40-60g / L, and the pH value is equal to 4.0-5.0. According to the method for preparing the high-temperature-resistant nanocrystalline nickel-cobalt coating on the surface of the copper alloy, the acid deposition solution is selected for use, the ZrO2 ceramic particles are added into the acid deposition solution, by using relative movement formed by the ceramic particles and the copper alloy, the hydrogen evolution phenomenon can be greatly reduced, and the problems of pinholes, hard spots, nodulationand the like existing in the electrodeposition process are solve, so that the crystal grains are effectively refined, and the quality of the nickel-cobalt coating is finally improved.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, and in particular relates to a method for preparing a high-temperature-resistant nanocrystalline nickel-cobalt coating on the surface of a copper alloy. Background technique [0002] Electrodeposition technology has been widely used in the preparation of surface functional deposition layers due to its economic and technological advantages such as low cost and easy process control. However, due to factors such as hydrogen evolution in aqueous solution, impurity adsorption, and tip discharge, the grains of the deposited layer produced by conventional electrodeposition are relatively coarse, and are prone to defects such as pinholes, pitting, and nodules, which are not suitable for the preparation of nanocrystalline nickel-cobalt. plating. [0003] Chinese patent document CN102260891A discloses a method for double-pulse electrodeposition of nanocrystalline nickel-cobalt alloy, although th...

Claims

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Application Information

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IPC IPC(8): C25D5/22C25D5/04C25D3/56C25D5/34C25F1/04
Inventor 赵阳王晓明朱胜周超极韩国峰任智强王启伟徐安阳
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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