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Preparation method of amorphous nickel-tungsten alloy coating layer

An amorphous nickel and tungsten alloy technology is applied in the field of preparation of amorphous nickel-tungsten alloy coatings, which can solve the problems of easy waveform change, unsuitable coating preparation, expensive equipment, etc. Application prospect and effect of promoting alloying

Inactive Publication Date: 2014-09-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To adjust the positive and negative pulse voltage, duty cycle and other parameters of the pulse current, it is necessary to combine the signal generator, power amplifier and oscilloscope for real-time monitoring. However, in the actual preparation process, the waveform is easy to change and cannot be prepared under constant parameters. Real-time monitoring is required. adjust
Using a hypergravity field can solve the problem of real-time parameter adjustment, but the equipment is expensive and not suitable for coating preparation on large parts

Method used

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  • Preparation method of amorphous nickel-tungsten alloy coating layer
  • Preparation method of amorphous nickel-tungsten alloy coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] follow first figure 1 As shown, the DC power supply 5, the ultrasonic motor 6 and the electric heater 7 are connected into a circuit, the anode 2 and the cathode 4 are drawn out from the DC power supply 5, and placed in the reaction vessel, and the thermometer 1 and the stirrer 3 are placed in the reaction vessel near the bottom of the container. Prepare the electroplating solution according to Table 1, pour it into the reaction container, and adjust the pH value of the electroplating solution to 6.9 with dilute hydrochloric acid. Grind and polish the substrate copper sample with 2000# alumina water-resistant sandpaper, ultrasonically clean it for 30 minutes, dry it, and immerse it in a hot alkaline solution with a volume mass of 50 g / L of sodium hydroxide and a volume mass of sodium dihydrogen phosphate of 10 g / L. After 15 minutes, the positive electrode was electrolyzed in a citric acid solution with a mass of citric acid volume of 20 g / L for pickling and activation,...

Embodiment 2

[0034] Prepare the electroplating solution according to Table 2, pour it into the reaction container, and adjust the pH value of the electroplating solution to 6.9 with dilute hydrochloric acid. Grind and polish the substrate copper sample with 2000# alumina water-resistant sandpaper, ultrasonically clean it for 60 minutes, dry it, and immerse it in a hot alkaline solution with a volume mass of 20 g / L of sodium hydroxide and a volume mass of sodium dihydrogen phosphate of 5 g / L. After 10 minutes, the positive electrode was electrolyzed in a citric acid solution with a volume mass of 10 g / L for pickling and activation, and the treatment time was 30 s. Then put the substrate copper sample into the electroplating solution at 40°C for electroplating treatment. The treatment conditions are that the ultrasonic power is controlled at 30kHz, the stirring speed is 100r / min, and the DC current density is 0.40A / cm 2 , the plating time is 20min, and the amorphous Ni-W alloy coating is pre...

Embodiment 3

[0039] Prepare the electroplating solution according to Table 3, pour it into the reaction container, and adjust the pH value of the electroplating solution to 7 with dilute hydrochloric acid. Grind and polish the substrate copper sample with 2000# alumina water-resistant sandpaper, ultrasonically clean it for 60 minutes, dry it, and immerse it in a hot alkaline solution with a volume mass of 60 g / L of sodium hydroxide and a volume mass of sodium dihydrogen phosphate of 20 g / L. After 20 minutes, the positive electrode was electrolyzed in a citric acid solution with a mass of citric acid volume of 30 g / L for pickling and activation, and the treatment time was 20 s. Then put the matrix copper sample into the electroplating solution at 68°C for electroplating treatment. The treatment conditions are that the ultrasonic power is controlled at 40kHz, the stirring speed is 300r / min, and the DC current density is 0.40A / cm 2 , the plating time is 30min, and the amorphous Ni-W alloy coa...

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Abstract

The invention relates to a preparation method of an amorphous nickel-tungsten alloy coating layer. The method combines ultrasonic wave with direct current, and uses a synergistic effect of the two to perform electroplating for preparing the amorphous nickel-tungsten alloy coating layer. Compared with the prior art, the method uses the ultrasonic wave to passivate defects of the coating layer, and accelerates solute mixing to promote alloying of nickel and tungsten; the device structure is simple; the easily-controlled direct current is adopted in the electroplating process; and the method can prepare the amorphous nickel-tungsten alloy coating layer with excellent surface quality. The method can improve the production efficiency of the amorphous nickel-tungsten alloy coating layer, reduces the production and operation costs, and has excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical surface coating, and relates to a preparation method of an alloy coating, in particular to a preparation method of an amorphous nickel-tungsten alloy coating. Background technique [0002] Nickel (Ni), has good corrosion resistance and decorative properties. Nickel and nickel alloys are widely used in surface protection materials, but the thermal stability of its amorphous coating is poor, and its applicability in high temperature environments is poor. . Tungsten (W) has high hardness and high melting point, but the preparation energy consumption of tungsten coating is very high, the color is black, and the application range as a protective material is not large. Ni-W alloy combines the advantages of nickel and tungsten metals, and its alloy coating has excellent corrosion resistance and heat resistance, which is beyond the reach of other nickel-based alloy coatings. Ni-W alloy has excel...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/34
Inventor 严彪杨颖张瑜徐莉莉张晴
Owner TONGJI UNIV
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