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Nickel-silicon carbide composite plating solution for electroplating

A composite electroplating, silicon carbide technology, applied in electrolytic coatings, coatings, mechanical equipment, etc., can solve problems such as low hardness and slow plating speed

Inactive Publication Date: 2008-11-12
薛玉田
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the composite coating is in contact with the sliding friction surface, the matrix metal nickel is first worn away, and then the solid particles embedded in the metal are protruded and subjected to wear. In addition, the nickel on the surface of the coating is worn away from the surrounding particles. It will form grooves with different depths and different directions. It can store lubricating oil (agent) so that it has good wear resistance. The Watt-type electroplating commonly used at present has a slow plating speed, about 2-3um / min, it takes a long time to complete (supplementary value), the hardness is not high, and the Watt type only has HV 0.2 ≈200~350

Method used

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  • Nickel-silicon carbide composite plating solution for electroplating
  • Nickel-silicon carbide composite plating solution for electroplating
  • Nickel-silicon carbide composite plating solution for electroplating

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A composite electroplating solution for electroplating nickel-silicon carbide: it includes nickel sulfamate 350g / L, boric acid 50g / L, sodium hypophosphite 0.85g / L, silicon carbide 25g / L, pH 4.4T (℃) 52 wherein . It is carried out by stirring method.

[0033] The following is the process of electroplating cast aluminum alloy cylinders with this electroplating solution:

[0034] Aluminum cylinder - degreasing - alkali corrosion - Idemitsu - first galvanizing - zinc stripping - second galvanizing - composite electroplating

[0035] This process is known as post-galvanizing plating. It must be thoroughly washed with water between each step to avoid the residual liquid from the previous process being brought into the next process.

[0036] 1. Degreasing: Before the surface treatment of any part, it must be degreased. The purpose of degreasing is to remove the dirt on the surface of the part, anti-rust oil and substances left on the surface in the previous process;

[003...

Embodiment 2

[0045] The process of this embodiment is the same as that of Embodiment 1, except that the composite plating solution and stirring method are changed to some extent. It includes nickel sulfamate 398g / L, boric acid 59g / L, sodium hypophosphite 0.9g / L, silicon carbide 29g / L, pH 4.5, T(°C) 54. The stirring method used in the composite plating solution is the D of the upflow circulation method. K =25A / dm 2 .

[0046] The part not described in this implementation is the same as that of Embodiment 1

Embodiment 3

[0048] The process of this embodiment is the same as that of Embodiment 2, except that the composite plating solution and stirring method are changed to some extent. It includes nickel sulfamate 320g / L, boric acid 45g / L, sodium hypophosphite 0.75g / L, silicon carbide 21g / L, pH 4.3, T(°C) 50. The stirring method used in the composite plating solution is the D of the upflow circulation method. K =20A / dm 2 .

[0049] The parts not described in this embodiment are the same as those in Embodiment 2.

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Abstract

The invention discloses a nickel-silicon carbide composite electroplate liquid, which comprises 300 to 400 g / L of nickel sulfamic acid, 40 to 60 g / L of boric acid, 0.7 to 1.0 g / L of sodium hypophosphite and 20 to 30 g / L of silicon carbide, wherein the pH value of the electroplate liquid is between 4.3 and 4.5 and the temperature of the electroplate liquid is between 50 and 55 DEG C. The nickel-silicon carbide composite electroplate liquid has the advantages of high hardness and quick plating speed.

Description

technical field [0001] The invention relates to a composite electroplating process, in particular to a composite electroplating solution used in the nickel-silicon carbide process for electroplating the inner wall of an aluminum alloy cylinder. Background technique [0002] The composite coating is a two-phase structure, one phase is the coating metal nickel formed by reduction reaction, which is the matrix metal and is a uniform continuous phase; the other phase is insoluble solid particle silicon carbide, which are usually discontinuously dispersed in the In the matrix metal, a discontinuous phase is formed. Composite coatings have the comprehensive properties of matrix metal and solid particles. When the composite coating is in contact with the sliding friction surface, the matrix metal nickel is first worn away, and then the solid particles embedded in the metal are protruded and subjected to wear. In addition, the nickel on the surface of the coating is worn away from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/02C25D3/12F16J10/04
Inventor 薛玉田
Owner 薛玉田
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