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Preparation method of Ni-W-P graded alloy

A gradient alloy and alloy technology, applied in the field of metal protection, can solve the problems of prone to cracks, high brittleness, and high internal stress of the coating, and achieve the effect of improving corrosion resistance and wear resistance, and improving corrosion resistance and wear resistance.

Active Publication Date: 2017-10-20
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for preparing gradient Ni-W-P alloys by using the scanning potential method in order to solve the problems of high internal stress, high brittleness and easy occurrence of cracks in the coating caused by constant potential and constant current deposition in the prior art. The alloy has a multi-layer gradient structure with strong corrosion and wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take about 800mL water and heat it to 50°C, add 80g of nickel sulfate, 20g of nickel chloride, 10g of sodium tungstate, 30g of sodium sulfate, 20g of sodium citrate, 10g of citric acid, 15g of phosphorous acid and 10g of boric acid under mechanical stirring. Set the volume to 1 L, adjust the pH value to 7 with sodium hydroxide solution, stir mechanically for 30 min, control the temperature in a constant temperature water bath to 45°C and stir for 10 min. First, the workpiece is derusted, degreased, washed, and activated in sequence according to the conventional pretreatment method, and then the pretreated workpiece is placed in the electrolyte, with the nickel plate as the auxiliary electrode and the workpiece as the working electrode. / s scanning speed from -1.3 V to -0.5 V continuously, rinse with water after plating, and dry naturally to obtain a single-layer gradient Ni-W-P alloy.

Embodiment 2

[0028] Take about 900 mL of water and heat it to 60 °C, add 20 g of nickel sulfate, 60 g of sodium tungstate, 60 g of potassium sulfate, 15 g of sodium citrate, 30 g of citric acid, 5 g of phosphorous acid, and 30 g of boric acid in sequence under magnetic stirring, and set the volume to 1 L, adjust the pH value to 6.5 with ammonia solution, stir with magnetic force for 45 minutes, control the temperature in a constant temperature water bath to 75°C and stir for 20 minutes. First, the workpiece is derusted, degreased, washed, and activated in sequence according to the conventional pretreatment method, and then the pretreated workpiece is placed in the electrolyte, with graphite as the auxiliary electrode and the workpiece as the working electrode. The scanning speed is continuously scanned from -0.5 V to -1.3 V. After plating, rinse with water and dry naturally to obtain a thinner single-layer gradient Ni-W-P alloy.

Embodiment 3

[0030] Take about 850mL of water and heat it to 55°C, add 40g of nickel sulfate, 50g of ammonium tungstate, 35g of ammonium chloride, 25g of sodium tartrate, 15g of citric acid, 10g of phosphorous acid, and 15g of boric acid under mechanical stirring, and make the volume 1 L , adjust the pH value to 7.5 with sodium hydroxide solution, stir mechanically for 20 min, and control the temperature in a constant temperature water bath to 50 °C and stir for 30 min. First, the workpiece is derusted, degreased, washed, and activated in sequence according to the conventional pretreatment method, and then the pretreated workpiece is placed in the electrolyte, with the nickel plate as the auxiliary electrode and the workpiece as the working electrode. / s scanning speed in the potential range -0.5 V - -1.3 V forward continuous scanning 10 times, rinse with water after plating, and dry naturally to obtain a single-layer gradient Ni-W-P alloy.

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Abstract

The invention relates to a preparation method of Ni-W-P graded alloy. The preparation method is characterized in that an electrolyte of the Ni-W-P alloy comprises the following components according to concentrations: 20-100 g / L of nickel salt, 10-60 g / L of tungstate, 30-60 g / L of conducting salt, 15-40g / L of a dispersing agent, 10-30 g / L of citric acid, 5-40 g / L of phosphorous acid and 10-30 g / L of boric acid; the preparation method comprises the following steps: immersing workpieces after pretreatment in the electrolyte of 45-75 DEG C, adopting the linear sweep voltammetry or cyclic linear sweep voltammetry for scanning at the speed of 0.1-100 mV / s within the range from minus 1.3 V to minus 0.5 V, and adjusting the sedimentary dynamic states of different ions by adjusting the deposition potential, so as to obtain the Ni-W-P graded alloy. According to the preparation method of the Ni-W-P graded alloy, the Ni-W-P graded alloy coating prepared by adopting the preparation method has a single-layer or multi-layer graded structure and contains amorphous phases, the microhardness can reach 500-1150 Hv, the corrosion resistance and wear resistance of the coating are obviously improved, and the preparation method has a potential application prospect.

Description

technical field [0001] The invention relates to a preparation method of a Ni-W-P alloy, in particular to a scanning potential preparation method of a Ni-W-P gradient alloy, which belongs to the field of metal protection. Background technique [0002] The improvement of alloy properties by designing multilayer or gradient alloys has become a research hotspot in the performance design of alloy materials in recent years. Ni-W alloy is widely used in the field of mechanical protection due to its excellent corrosion resistance and wear resistance, but the traditional constant potential and constant current deposition methods have some insurmountable defects, such as high internal stress of the coating, high brittleness, long Time thick plating is prone to cracks, and it is difficult to avoid, thus seriously reducing its corrosion resistance. In order to solve the above problems, we have made improvements in the following two aspects. One is to redesign the composition of the pla...

Claims

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Application Information

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IPC IPC(8): C25D3/56
CPCC25D3/562
Inventor 李保松环宇星张薇薇
Owner HOHAI UNIV
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