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Cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation plating layer and preparation method thereof

A technology of titanium alloy and trivalent chromium, applied in metal material coating process, coating, liquid chemical plating, etc., can solve the problems of low corrosion resistance, pollution of coating production, insufficient density of coating, etc., and achieve increased Corrosion ability, improvement of wear resistance, effect of production process safety

Inactive Publication Date: 2019-08-13
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation coating and its preparation method to solve the problems of insufficient coating compactness, low corrosion resistance, and pollution caused by coating production in the prior art.

Method used

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  • Cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation plating layer and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0036] Such as figure 1 As shown, a cyanide-free electroplating process for cadmium-plated titanium alloy and trivalent chromium passivation coating, including an aluminum alloy substrate 1, a galvanized layer 2 prepared sequentially from the inside to the outside on the surface of the aluminum alloy substrate, medium phosphorus electroless plating Nickel layer 3, cyanide-free cadmium titanium alloy coating 4, trivalent chromium blue-white passivation layer 5, nano-graphene sealing layer 6.

[0037] The zinc-impregnated layer 2 is prepared by AZIN-113 zinc-precipitating agent on acidic aluminum produced by Chaobang Chemical. The process parameters are the same as the current zinc dipping process, and the process parameters are as follows: zinc precipitating agent on acidic aluminum 150-250mL / L; temperature 15°C-30°C; pH3.4-4.2; time 10-90s.

[0038] The thickness of the medium phosphorous electroless nickel plating layer 3 is 2-10 μm, which is prepared by the GG-155 medium ph...

Embodiment 2

[0058] Such as figure 1 As shown, a cyanide-free electroplating process for cadmium-plated titanium alloy and trivalent chromium passivation coating, including an aluminum alloy substrate 1, a galvanized layer 2 prepared sequentially from the inside to the outside on the surface of the aluminum alloy substrate, medium phosphorus electroless plating Nickel layer 3, cyanide-free cadmium titanium alloy coating 4, trivalent chromium color passivation layer 5, nano-graphene sealing layer 6.

[0059] The zinc-impregnated layer 2 is prepared by AZIN-113 zinc-precipitating agent on acidic aluminum produced by Chaobang Chemical.

[0060] Technology is with embodiment 1.

[0061] The medium phosphorous electroless nickel plating layer 3 is prepared by the GG-155 medium phosphorescent bright electroless nickel plating process of Chaobang Chemical Co., Ltd., and the thickness of the plating layer is 2-10 μm.

[0062] Technology is with embodiment 1.

[0063] The cyanide-free and cadmiu...

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Abstract

The invention discloses a cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation plating layer and a preparation method of the cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation plating layer. The cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation plating layer comprises an aluminum alloy matrix, a zinc immersion layer, achemical nickel plating layer, a cyanide-free cadmium-titanium alloy plating layer, a trivalent chromium passivation layer and a nano-graphite seal layer, wherein the zinc immersion layer, the chemical nickel plating layer, the cyanide-free cadmium-titanium alloy plating layer, the trivalent chromium passivation layer and the nano-graphite seal layer are sequentially prepared on the surface of the aluminum alloy matrix from inside to outside. The cyanide-free cadmium-titanium alloy plating layer is prepared by the adoption of a potassium chloride cyanide-free cadmium titanium alloy electroplating technology, and the graphene seal layer is prepared from nanometer hydroxyl graphene modified seal agent. The cyanide-free cadmium-plated titanium alloy and trivalent chromium passivation platinglayer has the advantages that the potassium chloride cyanide-free cadmium titanium alloy plating layer can greatly improve the compactness, the corrosion resistance and the brightness of the platinglayer; the nanometer hydroxyl graphene modified seal agent is adopted to prepare the seal layer on the trivalent chromium passivation layer, so that the wear resistance, the corrosion resistance and the scratch resistance of the plating layer can be remarkably improved, and the nanometer hydroxyl graphene modified seal agent layer has the self-repairing performance and can make up the technical defect that the trivalent chromium passivation layer is in lake of self-repairing performance.

Description

technical field [0001] The invention belongs to the field of metal electroplating, and in particular relates to an electroplating process for cyanide-free cadmium plating titanium alloy and trivalent chromium passivation coating. Background technique [0002] The plated spacer has excellent corrosion resistance and is widely used in aerospace, marine parts and some electronic products with special requirements. At present, cyanide cadmium plating and / or cyanide-free cadmium plating are used to prepare protective layers for aerospace aluminum alloy parts. The original standard QJ 453-1988 "Technical Conditions for Cadmium Coatings" of the Ministry of Aerospace Industry requires that the neutral salt spray test of the plating layer should not be tested for 96 hours. White corrosion appears. [0003] The cadmium-titanium alloy coating has the characteristics of low light brittleness and is currently used to prepare the protective layer of aerospace high-strength steel parts. ...

Claims

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Application Information

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IPC IPC(8): C23C18/16C23C18/18C23C18/32C25D3/56C25D5/48C25D5/52C23C28/00
CPCC23C18/1653C23C18/1844C23C18/32C23C28/321C23C28/34C25D3/56C25D5/48C25D5/52
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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