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Method for chemical nickel-plating on surface of cement-based piezoelectric composite

A piezoelectric composite material and surface chemistry technology, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of affecting the stability of the plating solution, strong particle catalytic activity, and unsuitable nickel plating. Achieve the effect of low cost, tight combination of grains and uniform coating

Active Publication Date: 2016-05-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional electroless nickel plating process for non-metallic materials uses PdCl 2 Acid roughening-acid sensitization-acid activation-nickel plating process, the process is relatively complicated, PdCl 2 Palladium particles are expensive and toxic, and the particles have strong catalytic activity. During the electroless plating process, it is inevitable that palladium particles will fall into the plating solution, which will affect the stability of the plating solution.
In addition, the palladium salt activation method needs to be carried out under acidic conditions, and the acid has a strong corrosive effect on cement, so the palladium salt activation method is not suitable for cement-based piezoelectric composite materials.
[0005] At present, there is no literature report on the method of palladium-salt-free activated electroless nickel plating on the surface of cement-based piezoelectric composite materials. The electroless nickel plating process of sensitization and activation to avoid the erosion of cement-based piezoelectric composites by acidic media is of great significance for the application and development of cement-based piezoelectric composites and the improvement of the electroless nickel plating process

Method used

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  • Method for chemical nickel-plating on surface of cement-based piezoelectric composite
  • Method for chemical nickel-plating on surface of cement-based piezoelectric composite
  • Method for chemical nickel-plating on surface of cement-based piezoelectric composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] For above 8×8mm 2 , the surface of the cement-based piezoelectric composite material with a thickness of 2mm is nickel-plated, and the steps are as follows:

[0054] Step 1: Grinding and degreasing the surface of the cement-based piezoelectric composite material to be plated:

[0055] Grind the cement-based piezoelectric composite material to be plated with 600# and 1000# sandpaper in sequence, and then finely polish it with metallographic sandpaper. After ultrasonic cleaning for 10 minutes, immerse it in a degreasing solution containing acetone and ultrasonically clean it for 20 minutes.

[0056] Step 2: Surface roughening of the cement-based piezoelectric composite material to be plated:

[0057] Put the degreased cement-based piezoelectric composite material in the roughening solution for roughening, treat it at 30°C for 30 minutes, and then rinse it with water to remove the roughening solution. The preparation method of the coarsening solution is: mix sodium hydro...

Embodiment 2

[0072] For above 8×8mm 2 , the surface of the cement-based piezoelectric composite material with a thickness of 2mm is nickel-plated, and the steps are as follows:

[0073] Step 1: Same as Example 1.

[0074] Step 2: Same as Example 1.

[0075] Step 3: Reduction treatment of the cement-based piezoelectric composite material substrate to be plated:

[0076] Put the roughened cement-based piezoelectric composite into the reducing solution and soak for 10 min at room temperature.

[0077] Step 4: Activation treatment of the cement-based piezoelectric composite material substrate to be plated:

[0078] The reduced cement-based piezoelectric composite material was taken out and immersed in the activation solution, soaked at 35°C for 10 minutes, so that nickel ions could be reduced to elemental nickel and adsorbed on the surface of the substrate, and rinsed with water. The activation solution is an aqueous solution of nickel acetate, and the content of nickel acetate is 25g / L. ...

Embodiment 3

[0086] For above 8×8mm 2 , the surface of the cement-based piezoelectric composite material with a thickness of 2mm is nickel-plated, and the steps are as follows:

[0087] Step 1: Same as Example 1.

[0088] Step 2: Same as Example 1.

[0089] Step 3: Same as Example 1.

[0090] Step 4: Activation treatment of the cement-based piezoelectric composite material substrate to be plated:

[0091] Take the reduced cement-based piezoelectric composite material out and immerse it in the activation solution, and soak it at 35°C for 10 minutes, so that nickel ions can be reduced to simple nickel and adsorbed on the surface of the substrate, and rinsed with water after activation.

[0092] Step 5: Same as Example 1.

[0093] In the above step 4, the activation solution is an aqueous solution of nickel acetate or nickel sulfate, and the content of nickel acetate or nickel sulfate is 25g / L.

[0094] The coatings obtained by nickel acetate and nickel sulfate have bright and smooth sur...

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Abstract

The invention discloses a method for chemical nickel-plating on the surface of a cement-based piezoelectric composite. The method comprises the steps of coarsening, reducing, activating and nickel plating. Coarsening is conducted in alkaline coarsening fluid. The applied reducing solution is a sodium borohydride methyl alcohol water solution or a sodium borohydride ethyl alcohol water solution. The applied activating solution is an additive-contained nickel acetate water solution or an additive-contained nickel sulfate water solution. The nickel-plating solution comprises 18-22 g / L of nickel sulfate, 8-16 g / L of trisodium citrate, 26-32 g / L of sodium hypophosphite, 8-14 g / L of sodium acetate and 6-10 g / L of borax, and the pH is 6.5-7.5. The method for chemical nickel-plating on the surface of the cement-based piezoelectric composite is suitable for all kinds of cement-based piezoelectric composites with piezoelectric ceramics as function bodies and cement and epoxy resin as base bodies, the cost is low, and the environmental protection property is better; prepared coatings are flat in surface, uniform, consistent, good in corrosion resistance and electrical conductivity, high in weldability, capable of being closely combined with the cement-based piezoelectric composite, not prone to being disengaged and good in binding force, and application prospects are very good.

Description

technical field [0001] The invention relates to a method for plating nickel on the surface of a cement-based piezoelectric composite material, in particular to a method for palladium-salt-free activated electroless nickel plating on the surface of a cement-based piezoelectric composite material, and belongs to the technical field of non-metallic electroless plating. Background technique [0002] Piezoelectric materials are widely used in health monitoring of large-scale civil engineering because of their special electromechanical conversion properties. Piezoelectric materials mainly include piezoelectric ceramics and piezoelectric composite materials. The electromechanical coupling effect of piezoelectric ceramics is strong, and the piezoelectric strain constant is high, but the dielectric constant is high, so the piezoelectric voltage constant is generally low. Moreover, they have poor toughness and are prone to brittle cracking, resulting in low reliability and poor durab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18
CPCC23C18/18C23C18/36
Inventor 黄世峰张颖徐丽雯渠娇徐东宇程新
Owner UNIV OF JINAN
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