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Method for plating zinc-nickel alloy in alkaline electroplate liquid

A technology for electroplating zinc-nickel and alkaline plating solution, applied in the field of electro-zinc-nickel alloy, can solve the problems of low nickel content in the coating layer, low cathode current efficiency, etc. Effect

Inactive Publication Date: 2012-03-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of research has been done on zinc-nickel alloy electroplating processes at home and abroad, but most of them belong to the acid zinc-nickel alloy electroplating process, while the number of processes for electroplating zinc-nickel alloys in alkaline baths is small, the process is not mature, and there are coatings The nickel content is low (7-9%), the coating phase structure is not a single γ phase (the zinc-nickel alloy with a single γ phase has good corrosion resistance), and the cathode current efficiency is low (50-70%).

Method used

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  • Method for plating zinc-nickel alloy in alkaline electroplate liquid
  • Method for plating zinc-nickel alloy in alkaline electroplate liquid
  • Method for plating zinc-nickel alloy in alkaline electroplate liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment one: Electroplated zinc-nickel alloy coating on 30CrMnSiA steel substrate.

[0052] The first step is to prepare alkaline cleaning solution, pickling solution and electroplating solution.

[0053] Each liter of alkaline washing solution contains: NaOH 70g, NaOH 3 PO 4 12H 2 O 30g, Na 2 CO 3 10H 2 O 30g, Na 2 SiO 3 ·nH 2 O 30g. The rest is water.

[0054] Each liter of pickling solution contains 6mL of HCl.

[0055] Each liter of alkaline zinc-nickel alloy electroplating solution contains: ZnO 10g, NiSO 4 5g, NaOH 120g, complexing agent tetraethylenepentamine 3mL, triethanolamine 38mL, ammonia water 10mL, additive DE 1.5mL, CTAB 2g, brightener ZB 3mL, vanillin 0.2g, and the rest is water.

[0056] The second step is to mechanically polish and clean the plated parts.

[0057] Grind the substrate of the plated part to 1000 with aluminum oxide sandpaper # For sandpaper, use organic solution ethanol to ultrasonically clean the surface of the subst...

Embodiment 2

[0067] Embodiment two: Electroplated zinc-nickel alloy coating on stainless steel substrate.

[0068] The first step is to prepare alkaline cleaning solution, pickling solution and electroplating solution.

[0069] The preparation of alkaline washing solution and pickling solution is the same as in Example 1.

[0070] Electroplating solution is ZnO, NiSO 4 , NaOH, ammonium citrate, tetraethylenepentamine, triethanolamine, EDTA, phytic acid, DE, thiourea, and each liter of alkaline zinc-nickel alloy plating solution contains: ZnO 20g, NiSO 4 10g, NaOH 100g, complexing agent amine citrate 15g, tetraethylenepentamine 20mL, triethanolamine 40mL, EDTA 15g, additive phytic acid 0.15mL, DE 9mL, brightener thiourea 1g, the rest is water.

[0071] The second step is to mechanically polish and clean the plated parts.

[0072] Use sandpaper to polish the surface of the plated part to 1000 # , choose the organic solution acetone to ultrasonically clean the surface of the substrate ...

Embodiment 3

[0080] Embodiment three: A zinc-nickel alloy coating is electroplated on a copper substrate.

[0081] The first step is to prepare alkaline cleaning solution, pickling solution and electroplating solution.

[0082] Preparation of alkali washing solution and pickling solution is the same as in Example 1.

[0083] Alkaline zinc-nickel alloy plating solution is ZnO, NiSO 4 , NaOH, potassium sodium tartrate, tetraethylenepentamine, triethanolamine, sodium phytate, DE, saccharin, and contains 30g of ZnO, NiSO 4 13g, NaOH 140g, complexing agent potassium sodium tartrate 20g, tetraethylenepentamine 20mL, triethanolamine 80mL, additives sodium phytate 0.15g and DE 15mL, brightener saccharin 1g, and the rest is water.

[0084] The second step is to mechanically polish and clean the plated parts.

[0085] Grind the substrate of the plated part to 1000 with aluminum oxide sandpaper #, select the organic solution acetone to ultrasonically clean the surface of the substrate for 15 mi...

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Abstract

The invention discloses a method for electroplating alkaline Zn-Ni alloy, comprising the steps of: preparing alkali wash and acid wash, preparing electroplating Zn-Ni alloy plating solution, mechanical grinding, degreasing with organic solvent or water-based detergent, alkali washing, acid washing and electroplating. The invention provides a stable electroplating solution formula and complete electroplating process. The coating electroplated by the method is proved to have good flat surface, uniform coating distribution and alloy distribution, the coating is single gamma-phase, the nickel hasa content of 10% to 15%; the coating has superior corrosion resistance, red rust appears on the non-passivated Zn-Ni coating after 1500 hours in a neutral salt spray test; compared with general alkali electroplating solution, the coating has high current efficiency, reaching up to 80% to 90%.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a method for electroplating a zinc-nickel alloy in an alkaline plating solution. Background technique [0002] Electroplated zinc-nickel alloys have many excellent properties, such as excellent corrosion resistance, thermal stability and low hydrogen embrittlement, etc. Compared with galvanized layer and cadmium-plated layer, it can improve the corrosion resistance by more than 3 times, its thermal stability, hardness and wear resistance are significantly improved, and its hydrogen embrittlement can be greatly reduced. The electroplated zinc-nickel alloy plating solutions currently used can be divided into acidic systems and alkaline systems. The acidic system adopts acidic plating solution. Yubo et al. pointed out in the article "Research on Electroplating Zinc-Nickel Alloy for Aeronautical High-Strength Steel and Low Hydrogen Embrittlement" that the acidic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
Inventor 刘建华陈珏伶李松梅于美柳木桐
Owner BEIHANG UNIV
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