Preparation method of Ni-Co-Al2O3 gradient composite coating

A technology of Al2O3 and composite coating, applied in coatings, electrolytic coatings, etc., can solve problems such as no reports on gradient composite coating technology research, and achieve the effects of stable electrodeposition process, stable deposition and less impurities

Active Publication Date: 2014-10-15
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Ni-Co-Al was prepared by high-frequency pulse electrodeposition 2...

Method used

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  • Preparation method of Ni-Co-Al2O3 gradient composite coating
  • Preparation method of Ni-Co-Al2O3 gradient composite coating
  • Preparation method of Ni-Co-Al2O3 gradient composite coating

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1, a kind of method for preparing nickel-cobalt-alumina gradient composite coating, its steps are:

[0025] Preparation of electroplating solution: weigh 500g of NiSO 4 ·6H 2 O, 12g of CoSO 4 ·6H 2 O, 90g NiCl 2 ·6H 2 O, 60g of H 3 BO 3 , 90g nano-Al 2 o 3 Granules, 0.1g of cetyltrimethylammonium bromide, and deionized water were prepared into a 2000mL solution, mechanically stirred for 30min, and ultrasonically dispersed for 15min.

[0026] Electrodeposition process: select the steel sheet as the cathode and the nickel plate as the anode. Place the container containing the prepared electroplating solution in a water bath at 50°C, and mechanically stir at a speed of 200rpm~300rpm until the temperature of the electroplating solution is 50°C, and the pulse electrodeposition current density is 2A / dm 2 , the pulse frequency is 20kHz, and the duty cycle is 0.3 and 0.4, and the electrodeposition is continuous, and each duty cycle is deposited for 2 h.

...

Embodiment 2

[0031] Embodiment 2, a kind of method for preparing nickel-cobalt-alumina gradient composite coating, its steps are:

[0032] Preparation of electroplating solution: weigh 500g of NiSO 4 ·6H 2 O, 8g of CoSO 4 ·6H 2 O, 90g NiCl 2 ·6H 2 O, 60g of H 3 BO 3 , 60g of nano-Al 2 o 3 Granules, 0.1 g of cetyltrimethylammonium bromide, and 2000 mL of deionized water are used to prepare a solution. After the solution is prepared, stir it mechanically for 30 minutes, and then disperse it by ultrasonic wave for 15 minutes.

[0033] Electrodeposition process: select the steel sheet as the cathode and the nickel plate as the anode; place the beaker of the prepared electroplating solution in a water bath at 50°C, and perform mechanical stirring at a speed of 200rpm to 300rpm. The deposition current density is 2A / dm 2 , the pulse frequency was adjusted to 10kHz, and the duty cycles were 0.1, 0.2, 0.3, and 0.4, respectively, for continuous electrodeposition, and the deposition time f...

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Abstract

The invention relates to a preparation method of an Ni-Co-Al2O3 gradient composite coating. The method includes: employing deionized water to prepare nickel sulfate hexahydrate, cobalt sulfate hepathydrate, nickel chloride hexahydrate and boric acid into a plating solution, adding nano-aluminum oxide particles as a strengthening phase and cationic-type hexadecyl trimethyl ammonium bromide as a dispersing agent, using high-frequency impulse power with impulse frequency of 10kHz-200kHz, and changing the duty ratio according to the required coating thickness to conduct electrodeposition. The method controls the content of Co in the coating by adopting the 10kHz-200kHz high-frequency impulse power and changing the duty ratio of the power, so that the cobalt content of the coating is in gradient distribution, i.e. the Co content increases gradually from the coating surface to the interface of the coating and the substrate. And the content of Ni gradually decreases, so that the Co-Ni coating not only has high hardness but also ensures good corrosion resistance. The method provided by the invention is simple and safe to operate, and is economical and environment friendly.

Description

technical field [0001] The invention relates to a method for preparing nickel-cobalt-aluminum oxide (Ni-Co-Al 2 o 3 ) method of composite coating, especially a method for preparing Ni-Co-Al by using high-frequency pulse electrodeposition power supply 2 o 3 The method for a gradient composite coating belongs to the technical field of preparation of a functional gradient composite coating, and the gradient composite coating can be used in fields such as high-temperature wear-resistant and corrosion-resistant coatings of steel structural parts. Background technique [0002] Nickel-Co (Ni-Co) alloy coating has excellent mechanical properties and electromagnetic properties, and shows different properties with the content of Co (Co). Ni-Co alloys with low Co content have high corrosion resistance and are mainly used as decorative layers, widely used in chemical and medical fields. The Ni-Co alloy coating with high Co content has high coercive force and good electromagn...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D15/00C25D5/18
Inventor 陈汉宾吴护林张隆平贾代金李忠盛陈晓琴孙彩云陈大军
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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