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Additive component of alkaline solution for electroplating zinc-nickel alloy and brass and its preparation method

A technology of electroplating zinc-nickel and alkaline solution, applied in alkaline solution electroplating zinc-nickel alloy, additive components of brass and its preparation, electro-zinc-nickel alloy field, can solve the problem of poor bonding strength, poor solution uniform plating ability, problems such as uneven coating, to achieve the effect of improving bonding strength and improving efficiency

Inactive Publication Date: 2004-02-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After literature search, it was found that Zhou Xiaorong, Li Huafeng, Liu Liming, etc. in "Research on Electroplating Black Bright Zinc-Nickel Alloy in Alkaline System", (Material Protection, vol.32, No.5, 1999, 1-3) and Zhang Baocheng Editor-in-Chief "Electroplating Technology" (Beijing University of Aeronautics and Astronautics Press, Beijing, 1993) page 199 uses triethanolamine as an additive for electroplating brass and zinc-nickel alloys in alkaline solutions, but in the two electroplating processes, triethanolamine additives The disadvantages are that the coating is uneven, the coating is loose, the bonding strength is poor, the brightness of the coating is not high, and the throwing ability of the solution is poor.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 100mL, 10mL, and 100mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 10g of coumarin and 20g of thiourea in 10mL of absolute ethanol, then add 100mL of distilled water above 80°C, then add 20g of p-toluenesulfonate, 20g of sodium benzenesulfinate, and 0.1g of sodium dodecyl sulfate, mix Uniformly used as No. 2 solution. Take 12mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, add 10g / L to the alkaline electroplating brass solution, at 20°C, use zinc-impregnated ZK60 magnesium alloy as the cathode and stainless steel as the anode, and pass through at 2A / dm 2 The electric current treatment for 10 minutes can get a bright, dense and uniform brass coating of more than 10 microns.

Embodiment 2

[0014] First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 100mL, 40mL, and 120mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 20g of coumarin and 60g of thiourea in 20mL of absolute ethanol, then add 200mL of distilled water above 80°C, then add 60g of ammonium p-toluenesulfonate, 60g of sodium benzenesulfinate, and 0.2g of sodium dodecyl sulfate, mix Uniformly used as No. 2 solution. Take 30mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, take 10g / L and add it to the alkaline electroplating zinc-nickel alloy solution. At 40°C, use zinc-impregnated ZL20 aluminum alloy as the cathode and stainless steel as the anode, and pass through at 1A / dm 2 The electric current is treated for 10 minutes, and a bright, dense and uniform zinc-nickel alloy coating of more than 12 microns can be obtained.

Embodiment 3

[0016] First, measure triethanolamine, vanillin, and ethanolamine in sequence with a measuring cylinder to 50mL, 5mL, and 50mL respectively, and mix them uniformly in this order as No. 1 solution for later use. Dissolve 10g of coumarin and 30g of thiourea in 10mL of absolute ethanol, then add 100mL of distilled water above 80°C, then add 30g of p-toluenesulfonate, 30g of sodium benzenesulfinate, and 0.1g of sodium dodecyl sulfate, mix Uniformly used as No. 2 solution. Take 25mL of No. 1 solution and add the mixed No. 2 solution and mix well. After standing still for 24 hours, take 10g / L and add it to the alkaline electroplating zinc-nickel alloy solution. At 25°C, use the zinc-dipped AZ91 magnesium alloy as the cathode and stainless steel as the anode, and pass through at 4A / dm 2 The electric current is treated for 10 minutes, and a bright, dense and uniform zinc-nickel alloy coating of 18 microns or more can be obtained.

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Abstract

The present invention relates to an additive for electroplating zinc-nickel alloy and electroplating brass by using alkaline solution and its preparation method. The composition of the additive includes (wt%) 32-36.5% of primary brightening agent, 62.5-67% of secondary brightening agent and 0.5-1% of surfactant. Its preparation method includes the following steps: mixing triethanolamine, vanillinand ethanolamine according to a certain ratio, uniformly stirring them to obtain mixed solution; then using small quantity of absolute ethanol to dissolve coumarin and thiourea, adding small quantityof distilled water, and adding p-toluenesulfonamide, sodium benzene sulfinate and sodium lauryl sulfate or sodium lauryl sulfonate to obtain mixed solution, then mixing the above-mentioned two mixed solutions.

Description

technical field [0001] The invention relates to an additive component for electroplating zinc-nickel alloy and brass and a preparation method thereof, in particular to an additive component and preparation method for electroplating zinc-nickel alloy and brass in an alkaline solution, and belongs to the technical field of electroplating. Background technique [0002] In alkaline solution, the additive affects the surface roughness, uniformity, dispersion ability and deep plating ability of electroplated zinc-nickel alloy and brass coating. The additive improves the cathode polarization and refines the grains. When the grains of the coating are refined to less than the wavelength of visible light, the light cannot be diffused, making the coating look very bright. Zinc-nickel alloy plating and brass plating additives mainly use the principles of alkaline solution zinc plating additives, nickel plating additives, and copper plating additives to prepare zinc-nickel alloy plating ...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D3/58
Inventor 蒋永锋翟春泉郭兴伍曾小勤丁文江
Owner SHANGHAI JIAO TONG UNIV
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