Electroplating pearl nickel additive, electroplating pearl nickel solution and electroplating method thereof

A technology of nickel plating solution and pearl nickel, which is applied in the field of pearl nickel, can solve the problems of low production efficiency and high cost, and achieve the effects of low consumption, simple types and stable plating solution

Active Publication Date: 2020-05-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use a cooling and heating cycle device to ensure that the temperature of the solution is maintained above the cloud point. If the plating solution is unstable, it needs to stop production and add carbon powder for filtration. The production efficiency is low and the cost is high.

Method used

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  • Electroplating pearl nickel additive, electroplating pearl nickel solution and electroplating method thereof
  • Electroplating pearl nickel additive, electroplating pearl nickel solution and electroplating method thereof
  • Electroplating pearl nickel additive, electroplating pearl nickel solution and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 6.0g / L sodium dicyanamide (Na[DCA]) additive to the solution containing 170g / LNiSO 4 ·6H 2 O, 25g / LH 3 BO 3 in the aqueous solution. The effect of current density and temperature on pearl nickel coating was investigated by Hall cell experiment. According to the formula j=i(5.1-5.42lgl), the current density from the proximal end to the distal end is changed from 0.3A / dm 2 Rise to 15.3A / dm 2 , at different temperatures, the coating condition of the Hall cell is as follows figure 1 shown.

[0033] from figure 1 It can be seen that at 40°C, when the current density is greater than 2A / dm 2 When the nickel coating has white pearlescent properties, when the current density is less than 2A / dm 2 , the color of the coating becomes darker, grayish black. As the temperature increases, the pearlescent region narrows and the film becomes rough in the low current density region.

Embodiment 2

[0035] Add 1.0g / L sodium dicyanamide (Na[DCA]) additive to the solution containing 170g / LNiSO 4 ·6H 2 O, 25g / L H 3 BO 3 in the aqueous solution. The effect of current density on pearl nickel coating was investigated by Hall cell experiment. According to the formula j=i(5.1-5.42lgl), the current density from the proximal end to the distal end is changed from 0.3A / dm 2 Rise to 15.3A / dm 2 , at different temperatures, the coating condition of the Hall cell is as follows figure 2 shown. At 40°C, at a current density of 3-11A / dm 2 The coating in the interval presents white pearlescent. As the temperature rises, the pearlescent region narrows and moves to the low current density region. Cracks occur in the plating layer in the high current density area.

Embodiment 3

[0037] 4.0g / L sodium dicyanamide additive is added to containing 330g / LNiSO 4 ·6H 2 O, 37g / L H 3 BO 3 in the aqueous solution. The effect of current density on pearl nickel coating was investigated by Hall cell experiment. According to the formula j=i(5.1-5.42lgl), the current density from the proximal end to the distal end is changed from 0.3A / dm 2 Rise to 15.3A / dm 2 , at different temperatures, the coating condition of the Hall cell is as follows image 3 shown. Pearlescent nickel exhibits white pearlescence in the high current density area, and the coating color becomes darker in the low current density area, showing gray black. As the temperature of the plating solution increases, the pearlescent region becomes narrower. At 60°C, the current density is higher than 11A / dm 2 , the coating cracks.

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Abstract

The invention provides an electroplating pearl nickel additive, an electroplating pearl nickel solution and an electroplating method, and belongs to the technical field of pearl nickel. The electroplating pearl nickel additive contains organic dicyanamide radical anions, and is suitable for a full sulfate plating solution and a watt plating solution. The electroplating method is different from anemulsifier method, commonly used nowadays, for preparation of pearlescent nickel, the solution is not required to be heated to the cloud point, no emulsion is formed, and the plating solution is morestable. In the full sulfate plating solution, the additive amount of dicyanamide salt is 1.0 g / L-6.0 g / L, and the white pearlescent nickel can be obtained in the working temperature range of 40 DEG C-60 DEG C; in the watt plating solution, the additive amount of dicyanamide sodium is 0.5 g / L-3.0 g / L, and the working temperature range is 40 DEG C-60 DEG C; and the type of the additive is simple, preparing and monitoring are easy, pearlescent performance on the surface of a plating is good, and adhesion with a substrate is good.

Description

technical field [0001] The invention relates to the technical field of pearl nickel, in particular to an electroplating pearl nickel additive, which is suitable for a full sulfate nickel plating solution, a Watt nickel plating solution and an electroplating method. Background technique [0002] Pearl nickel is also known as satin nickel, sand fog nickel, satin nickel, etc. The pearl nickel coating is milky white, with fine and soft luster, low internal stress and good corrosion resistance. It is an excellent protective decorative coating. Traditionally, pearl nickel has been electroplated by two methods: composite plating and emulsifier method. The composite plating method utilizes co-deposition of metal compound particles and nickel ions to form an uneven coating. The luster of the coating obtained by this method is not ideal, and the plating solution is not easy to maintain. The emulsifier method is to add one or more non-ionic surfactants to the nickel plating solution...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/12
CPCC25D3/12
Inventor 吴敏娴张慧敏李思敏秦水平王文昌陈智栋
Owner CHANGZHOU UNIV
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