Cobalt-tungsten nanometer alloy plating layer and preparation method thereof

A nano-alloy, tungsten alloy technology, applied in nano-technology, nano-technology, nano-technology for materials and surface science, etc., to achieve the effect of energy saving, small investment and simple method

Inactive Publication Date: 2012-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, there are few relevant patents and papers on cobalt-based alloy coatings at hom

Method used

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  • Cobalt-tungsten nanometer alloy plating layer and preparation method thereof
  • Cobalt-tungsten nanometer alloy plating layer and preparation method thereof
  • Cobalt-tungsten nanometer alloy plating layer and preparation method thereof

Examples

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Embodiment 1

[0019] A preparation method of a cobalt-tungsten nano-alloy coating, the specific steps are as follows:

[0020] Prepare the electroplating solution of cobalt-tungsten nano-alloy coating, its component is to include in every liter of plating solution: 112g cobalt sulfate, 33g sodium tungstate, 19g boric acid, 0.06g sodium dodecylbenzenesulfonate, 59g sodium citrate, 100g sodium sulfate, 1g sodium saccharin. The above plating solution is electroplated, the anode is a platinum titanium mesh, and the cathode is a brass substrate that has undergone degreasing-cleaning-acid activation. Electroplating adopts double-pulse electroplating method, and the average current density of forward and reverse is 4A / dm respectively 2 and 0.4A / dm 2 , the forward and reverse pulse frequency is 1000hz, the magnetic stirring speed is 100 rpm, the control temperature is 20°C, the Ph value is 3, and the electroplating is 1h. The cobalt-tungsten nano-alloy coating is prepared, and its XRD spectrum is...

Embodiment 2

[0022] A preparation method of a cobalt-tungsten nano-alloy coating, the specific steps are as follows:

[0023] Prepare the electroplating solution of cobalt-tungsten nano-alloy coating, its component is to include in every liter of plating solution: 100g cobalt sulfate, 30g sodium tungstate, 20g boric acid, 0.05g sodium dodecylbenzenesulfonate, 60g sodium citrate, 100g sodium sulfate, 1.5g sodium saccharin. The above plating solution is electroplated, the anode is a platinum titanium mesh, and the cathode is a brass substrate that has undergone degreasing-cleaning-acid activation. Electroplating adopts double-pulse electroplating method, and the average current density of forward and reverse is 6A / dm respectively 2 and 0.6A / dm 2 , the forward and reverse pulse frequency is 800hz, the magnetic stirring speed is 100 rpm, the control temperature is 70°C, the Ph value is 8, and the electroplating is 3h, and the cobalt-tungsten nano-alloy coating is prepared, and its XRD spectr...

Embodiment 3

[0025] A preparation method of a cobalt-tungsten nano-alloy coating, the specific steps are as follows:

[0026] Prepare the electroplating solution of cobalt-tungsten nano-alloy coating, its component is to comprise in every liter of plating solution: 120g cobalt sulfate, 33g sodium tungstate, 30g boric acid, 0.06g sodium dodecylbenzenesulfonate, 59g sodium citrate, 100g sodium sulfate, 1g sodium saccharin. The above plating solution is electroplated, the anode is a platinum titanium mesh, and the cathode is a brass substrate that has undergone degreasing-cleaning-acid activation. Electroplating adopts double-pulse electroplating method, and the average current density of forward and reverse is 8A / dm respectively 2 and 0.8A / dm 2 , the forward and reverse pulse frequency is 1500hz, the magnetic stirring speed is 200 rpm, the control temperature is 50°C, the Ph value is 5, and the electroplating is 2h. The cobalt-tungsten nano-alloy coating is prepared, and its XRD spectrum i...

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Abstract

The invention discloses a preparation method of a cobalt-tungsten nanometer alloy plating layer, which comprises steps of electroplating by using a platinum titanium or cobalt-tungsten alloy as an anode and a workpiece to be plated as a cathode and using a mixed solution as electrolyte, wherein the mixed solution contains 100-200 g/L of cobaltous sulfate, 10-70 g/L of sodium tungstate, 50-150 g/L of g/L of sodium sulfate, 15-50 g/L of boracic acid, 1-4 g/L of saccharin sodium salt, 0.01-0.1 g/L of surfactant and 40-120 g/L of complexing agent; the alloy plating layer is of a nanometer crystal structure, and the dimension of a crystalline grain is 20-40 nm; and the tungsten content in the nanometer alloy plating layer is 13.2-25.1 wt%. The invention has the advantages that the preparation method of the plating layer is simple, and the plating layer not only has the hardness of a hard chromium plating layer, but also has better wearing resistance and friction reduction performance than the hard chromium plating layer. The plating layer is suitable for components with high hardness, high wearing resistance and low friction coefficients and has an extensive application range.

Description

technical field [0001] The invention discloses a cobalt-tungsten nano-alloy coating and a preparation method thereof. The coating of the invention not only has high hardness, but also has very excellent wear resistance and antifriction properties. It is suitable for components that require high hardness, high wear resistance and low friction coefficient, and can replace the traditional hard chromium coating that pollutes the environment. It has a wide range of applications in the fields of automobiles, machinery, precision manufacturing and aerospace. Background technique [0002] With the rapid development of modern automobile industry, machinery industry, aviation and aerospace industry, more and more high-load cylinder pistons and sliding parts are used under the action of dry friction, hydraulic pressure and lubricating oil medium. Electroplating high-hardness, high-temperature-resistant, corrosion-resistant and fatigue-resistant coating materials on the surface of slid...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/18C25D21/10B82Y40/00B82Y30/00
Inventor 苏峰华黄平刘灿森姚创海
Owner SOUTH CHINA UNIV OF TECH
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