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Plating process for low-nickel non-cyanogen alkalescent zinc-nickel alloy

An electroplating process and zinc-nickel alloy technology, applied in the field of alloy electroplating, can solve the problems of unfavorable practical application in production sites and high cost, and achieve the effects of convenient industrial application, low cost and stable process

Inactive Publication Date: 2008-12-03
杭州东方表面技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents all use single or composite polyamines as complexing agents for nickel. The content of nickel in the alloy coating is generally about 15%, and the cost is relatively high, and the mass fraction of nickel in the coating varies within a large range, which is not conducive to Practical application on the production site

Method used

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  • Plating process for low-nickel non-cyanogen alkalescent zinc-nickel alloy
  • Plating process for low-nickel non-cyanogen alkalescent zinc-nickel alloy
  • Plating process for low-nickel non-cyanogen alkalescent zinc-nickel alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1-5

[0022] Example 1-5: Effect of Temperature on Nickel Content and Current Efficiency of Coating

[0023] Plating solution composition: add ZN-1A additive 8ml / liter, ZN-1B additive 2ml / liter, nickel complex 60ml / liter, nickel sulfate 8g / liter to the basic solution. Prepare 1 liter of solution according to the above concentration, use zinc plate or nickel plate as anode, 2 square centimeter iron plate as cathode, and use 2A / dm 2 The current density was electroplated at different temperatures for 20 minutes, and the results were as follows:

[0024]

example 6-10

[0025] Example 6-10: The influence of the amount of nickel sulfate on the nickel content of the coating

[0026] Plating solution composition: add ZN-1A additive 8ml / liter, ZN-1B additive 2ml / liter, nickel complex 60ml / liter, nickel sulfate 8g / liter to the basic solution. Prepare 1 liter of solution according to the above concentration, use zinc plate or nickel plate as anode, 2 square centimeter iron plate as cathode, and use 2A / dm 2 The current density was electroplated at 26°C for 20 minutes, and the results were as follows:

[0027]

example 11-14

[0028] Example 11-14: The influence of the amount of complexing agent on the nickel content of the coating

[0029] Plating solution composition: add ZN-1A additive 8ml / liter, ZN-1B additive 2ml / liter, nickel sulfate 8g / liter to the basic solution, and the concentration of the complex is changed according to the test requirements. Prepare 1 liter of solution according to the above concentration, use zinc plate or nickel plate as anode, 2 square centimeter iron plate as cathode, and use 2A / dm 2 The current density was electroplated at 25°C for 20 minutes, and the results were as follows:

[0030]

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Abstract

The invention relates to a plating technology of alkaline zinc nickel alloy without cyanogen with low nickel content. The technology comprises the steps as follows: nickel retention agent is synthesized in the water medium through the reaction between divinyl triammonium and epoxy chloropropane in the temperature of 60 to 70 DEG C, wherein, the mol ratio between the divinyl triammonium and the epoxy chloropropane is 1:1; nickel composition is obtained after sufficient complexation between the nickel complexing agent and the nickel ions; the nickel composition is dissolved in alkaline zincate basic liquid, and then the mixed solution is mixed well; plating additive is added and then the mixed solution is mixed well; the plating is processed according to the plating technology demands. The plating technology has the beneficial effects that: the plating solution has excellent dispersive capacity; cladding alloying component is homogeneous in a wilder ampere density range; the thickness of a cladding layer is homogeneous; the equipment and the workpiece are corrupted slightly; the technology is steady, the operation is simple, and the cost is lower; a zinc plate or a nickel plate can be adopted as an anode; the plating technology has the advantages that the technology is stable, the dispersive capacity is good, the high temperature is endured and the nickel content is steady in the cladding layer, etc.; the industrial application is convenient.

Description

technical field [0001] The invention belongs to the field of alloy electroplating, and mainly relates to an electroplating process for a cyanide-free alkaline zinc-nickel alloy with low nickel content. Background technique [0002] The zinc-nickel alloy coating refers to an alloy coating containing a small amount of nickel (generally, the mass fraction is 5-20%). Zinc-nickel alloy coating has better corrosion resistance, bonding force and weldability than pure zinc coating, and its corrosion resistance and wear resistance are 3 to 6 times that of ordinary zinc coating, especially in harsh industrial atmospheres and It has excellent corrosion resistance in the harsh marine environment. Therefore, the zinc-nickel alloy process has long been a research hotspot, and it is one of the fastest-growing plating types in the past ten years, and has been widely used in auto parts, coal mining machinery, ship water conservancy engineering and other industries. There are two systems of...

Claims

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Application Information

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IPC IPC(8): C25D3/56
Inventor 曾鑫张光前
Owner 杭州东方表面技术有限公司
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