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Plating solution for electroless plating of Ni-W-Zn-P alloy coating and coating process thereof

An alloy coating and electroless plating technology, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the problem of low alloying degree, limited variation range of coating composition, poor compactness of Ni-W-P alloy coating, etc. problem, to achieve the effect of strong corrosion resistance

Active Publication Date: 2015-11-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the poor compactness and low alloying degree of the Ni-W-P alloy coating obtained by the existing technology, the variation range of the coating composition is limited, and the improvement of hardness and corrosion resistance has reached a bottleneck.

Method used

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  • Plating solution for electroless plating of Ni-W-Zn-P alloy coating and coating process thereof
  • Plating solution for electroless plating of Ni-W-Zn-P alloy coating and coating process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Step 1: Substrate pretreatment

[0083] A mechanical grinding. Grind the Q235 steel samples with a size of 15mm*15mm*1.5mm with 200#, 400#, 600#, 800#, 1000# and 1500# sandpaper until the surface is basically smooth, and then rinse with water.

[0084] B Degreasing. Soak the sample treated in step A in step 1 with 6% NaOH solution at about 65°C to remove the oil stain on the surface of the sample. The presence of oil stain will seriously affect the bonding force between the coating and the sample. The test method of whether the oil is completely removed is to drop a drop of water on the sample. If the water drop can completely spread the sample, the oil is completely removed. Otherwise, continue to soak to remove oil. Rinse with clean water after degreasing.

[0085] C chemical rust removal. Soak the sample treated in step B in step 1 in 20% sulfuric acid solution for 5-10 minutes to remove surface oxides. Rinse the sample with clean water after derusting.

[0086...

Embodiment 2

[0112] Step 1: Substrate pretreatment

[0113] A mechanical grinding. Grind the Q235 steel samples with a size of 15mm*15mm*1.5mm with 200#, 400#, 600#, 800#, 1000# and 1500# sandpaper until the surface is basically smooth, and then rinse with water.

[0114] B Degreasing. Soak the sample treated in step A in step 1 with 6% NaOH solution at about 65°C to remove the oil stain on the surface of the sample. The presence of oil stain will seriously affect the bonding force between the coating and the sample. The test method of whether the oil is completely removed is to drop a drop of water on the sample. If the water drop can completely spread the sample, the oil is completely removed. Otherwise, continue to soak to remove oil. Rinse with clean water after degreasing.

[0115] C chemical rust removal. Soak the sample treated in step B in step 1 in 20% sulfuric acid solution for 5-10 minutes to remove surface oxides. Rinse the sample with clean water after derusting.

[0116...

Embodiment 3

[0142] Step 1: Substrate pretreatment

[0143] A mechanical grinding. Grind the Q235 steel samples with a size of 15mm*15mm*1.5mm with 200#, 400#, 600#, 800#, 1000# and 1500# sandpaper until the surface is basically smooth, and then rinse with water.

[0144] B Degreasing. Soak the sample treated in step A in step 1 with 6% NaOH solution at about 65°C to remove the oil stain on the surface of the sample. The presence of oil stain will seriously affect the bonding force between the coating and the sample. The test method of whether the oil is completely removed is to drop a drop of water on the sample. If the water drop can completely spread the sample, the oil is completely removed. Otherwise, continue to soak to remove oil. Rinse with clean water after degreasing.

[0145] C chemical rust removal. Soak the sample treated in step B in step 1 in 20% sulfuric acid solution for 5-10 minutes to remove surface oxides. Rinse the sample with clean water after derusting.

[0146...

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Abstract

The invention discloses a plating solution for electroless plating of a Ni-W-Zn-P alloy coating and a coating process thereof. The plating solution comprises 15-30 g / L of nickel sulfate, 30-60 g / L of sodium tungstate, 3-10 g / L of zinc sulfate, 80-120 g / L of sodium citrate, 15-25 g / L of sodium hypophosphite, 30-50 g / L of ammonium chloride, 10-20 mg / L of lead nitrate, 3-10 mL / L of lactic acid, and 0.15-0.3 g / L of cerium sulfate. In the experimental process, PH is regulated to be at 8.5-9.5 by ammonium hydroxide; the plating temperature is 70-90 DEG C; and plating time is 2 hours. A coating obtained through the coating process is 20-30 [mu] m in thickness and up to 600 HV0.1 in microhardness. The zinc sulfate is added to the plating solution, so that the obtained coating contains zinc, and corrosion resistance of the coating can be improved to a large extent. After heat treatment, a zinc-phosphorus alloy phase is separated out, so that texture is refined and a dispersion strengthening function is achieved. The cerium sulfate is added, so that not only is the plating speed increased, but also the coating is more even and compact.

Description

technical field [0001] The invention relates to an electroless plating solution and a coating process of an electroless plating layer, in particular to a plating solution of an electroless Ni-W-Zn-P alloy coating and a coating process thereof. technical background [0002] With the development of industrial production, the surface of the material is required to have higher corrosion resistance, wear resistance and hardness, etc., but because the whole part is made of this high-performance material, it not only causes waste of materials, but also requires higher production technology. The method of preparing a certain thickness of high-performance coating on the surface of the material by using the material surface modification technology can solve this problem very well. Ni-P alloys are widely used because they not only have high corrosion resistance, wear resistance and mechanical properties, but also can impart many other properties to the material surface, such as brazabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/48
Inventor 林涛韩宇超邵慧萍金钟铃何新波
Owner UNIV OF SCI & TECH BEIJING
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