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A kind of plating solution for nanocrystalline trivalent chromium composite coating and preparation method of composite coating

A composite coating, trivalent chromium technology, applied in the field of electrochemical deposition, can solve problems such as poor plasticity of amorphous coating, and achieve the effect of overcoming cracks and good plasticity

Active Publication Date: 2019-09-20
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plasticity of the amorphous coating is often poor, which has a certain impact on the use of the chromium coating
However, there is not yet a mature process that can use trivalent chromium plating solution to prepare a relatively stable crystalline chromium plating layer.

Method used

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  • A kind of plating solution for nanocrystalline trivalent chromium composite coating and preparation method of composite coating
  • A kind of plating solution for nanocrystalline trivalent chromium composite coating and preparation method of composite coating

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preparation example Construction

[0037] In another specific embodiment, the present invention also provides a method for preparing a composite coating using the plating solution for the above-mentioned nanocrystalline trivalent chromium composite coating, wherein the specific steps are as follows:

[0038] Step 1, pretreatment before plating;

[0039] Step 2, trivalent chromium spray electrodeposition composite process, the specific process parameters are as follows:

[0040] ① Preheat the plating solution at a temperature of 35-45°C;

[0041] ② Adjust the distance between the spray gun and the anode to 5-8mm;

[0042] ③The flow rate of the plating solution is 2.7-3.5L / min;

[0043] ④The current density is 40-65A / dm2;

[0044] ⑤ The moving speed of the spray gun is 1.2-1.8mm / s;

[0045] ⑥The spraying time is 25min~75min.

[0046] The pre-plating pretreatment is carried out by brush plating, and the specific process is: sandpaper polishing → electric cleaning → activation of No. 2 activation solution → ac...

Embodiment 1

[0050] A kind of plating solution for nanocrystalline trivalent chromium composite coating, the mass fraction composition of described plating solution is as follows: trivalent chromium solution: 18g / L; Composite additive: 15g / L; Buffer: 80g / L; Catalyst: 10g / L L.

Embodiment 2

[0052] A kind of plating solution for nanocrystalline trivalent chromium composite coating, the mass fraction composition of described plating solution is as follows: trivalent chromium solution: 38g / L; Composite additive: 45g / L; Buffer: 240g / L; Catalyst: 40g / L L.

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Abstract

The invention provides a plating solution for a nanocrystalline trivalent chromium composite plating layer and a preparation method of the composite plating layer. The plating solution comprises the following components of, by mass part, 18-38g / L of a trivalent chromium solution, 15-45g / L of a compound additive, 80-240 g / L of buffering agents and 10-40g / L of catalysts, wherein the composite additive is SiO2, and the diameters of SiO2 particles are in the range of 10-30nm. According to the plating solution, the crystallization process of trivalent chromium electrodeposition is changed mainly byadding the nanometer SiO2 particles with optimized proportions into the trivalent chromium plating solution and performing spraying electrodeposition, so that the preparation of the nanocrystalline trivalent chromium composite plating layer is realized, subsequent heat treatment processes are not required, the plasticity of the chromium plating layer is improved, and cracks generated due to internal stress of the chromium plating layer can be overcome.

Description

technical field [0001] The invention belongs to the technical field of electrochemical deposition, and in particular relates to a plating solution for a nanocrystalline trivalent chromium composite coating and a preparation method for the composite coating. Background technique [0002] Chromium is a transition metal, which is easy to passivate, has high chemical stability, good wear resistance and ablation resistance. The chromium layer is mainly prepared by electrodeposition, through a specific chemical plating solution under the action of external power supply , with the base metal to be plated as the cathode and chromium or other inert conductors as the anode, a solid chromium coating is obtained on the surface of the base under electrochemical action. The crystalline structure of the chromium coating is dense, the surface of the coating is smooth, and its hardness can vary in the range of 500-1000HV with different process conditions. Chromium plating can be divided int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/06C25D5/08C25D15/00
Inventor 张庆谭俊李家柱臧艳孟令东叶雄唐振郑晓辉
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY