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Alkali system electroplating bright zinc-nickel alloy process

A technology of nickel alloy and system, applied in the field of bright zinc-nickel alloy electroplating in alkaline system, to achieve the effect of ensuring stability, low brittleness and easy passivation

Inactive Publication Date: 2012-01-04
武汉吉和昌新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a bright zinc-nickel alloy electroplating process in an alkaline system for the defects of the existing electroplating zinc-nickel alloy process

Method used

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  • Alkali system electroplating bright zinc-nickel alloy process
  • Alkali system electroplating bright zinc-nickel alloy process
  • Alkali system electroplating bright zinc-nickel alloy process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The formulation of the electroplating solution is as follows:

[0038]

[0039] The plating temperature is room temperature, and the cathode current density is 5.0A / dm 2 , Plating time 15 minutes.

[0040] Electroplating solution preparation method of the present invention is as follows, is example with 1000 milliliters:

[0041] (1), in a container with a capacity of 1000 milliliters, put 500 milliliters of deionized water, add 100 grams of NaOH, and stir to dissolve;

[0042] (2), then add 8 grams of ZnO while it is hot, stir, and dissolve it completely; after the temperature drops to room temperature, add 45 milliliters of complexing agent:

[0043] (3), in another 500 ml container, put 250 ml of hot deionized water at 50 degrees, add 35 grams of tartaric acid, 12 grams of NiSO 4 ·6H 2 O stir, dissolve:

[0044] (4) Pour the solution of the above step (3) into the solution of step (2), add 8 ml of brightener, add deionized water to 1000 ml, and stir evenly. ...

Embodiment 2

[0059] The formulation of the electroplating solution is as follows:

[0060]

[0061] The plating temperature is room temperature, and the cathode current density is 1.0A / dm 2 , Plating time 30 minutes.

[0062] Electroplating solution preparation method of the present invention is as follows, is example with 1000 milliliters:

[0063] (1), in a container with a capacity of 1000 milliliters, put 500 milliliters of deionized water, add 120 grams of NaOH, and stir to dissolve;

[0064] (2), then add 10 grams of ZnO while it is hot, stir, and dissolve it completely; after the temperature drops to room temperature, add 50 milliliters of complexing agent:

[0065] (3), in another 500 ml container, put 250 ml of hot deionized water at 50 degrees, add 35 grams of tartaric acid, 12 grams of NiSO 4 ·6H 2 O stir, dissolve:

[0066] (4) Pour the solution of the above step (3) into the solution of step (2), add 8 ml of brightener, add deionized water to 1000 ml, and stir evenly. ...

Embodiment 3

[0081] The formulation of the electroplating solution is as follows:

[0082]

[0083]

[0084] The plating temperature is room temperature, and the cathode current density is 4.0A / dm 2 , Plating time 20 minutes.

[0085] Electroplating solution preparation method of the present invention is as follows, is example with 1000 milliliters:

[0086] (1), in a container with a capacity of 1000 milliliters, put 500 milliliters of deionized water, add 140 grams of NaOH, and stir to dissolve;

[0087] (2), then add 12 grams of ZnO while it is hot, stir, and dissolve it completely; after the temperature drops to room temperature, add 60 milliliters of complexing agent:

[0088] (3), in another 500 ml container, put 300 ml of hot deionized water at 50 degrees, add 45 grams of tartaric acid, 18 grams of NiSO 4 ·6H 2 O stir, dissolve:

[0089] (4) Pour the solution of the above step (3) into the solution of step (2), add 12 milliliters of brightener, add deionized water to 1000...

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Abstract

The invention relates to a process for electroplating zinc-nickel alloy, in particular to an alkali system electroplating bright zinc-nickel alloy process. The formula of electroplating liquid is that: one liter of electroplating liquid comprises 8 to 12 grams of ZnO, 100 to 140 grams of NaOH, 45 to 60 milliliters of complexing agent, 12 to 18 grams of NiSO4.6H2O, 35 to 45 grams of C6H6O5 and 8 to 12 milliliters of brightening agent. The zinc-nickel alloy is electroplated at room temperature, the cathode-current density is 0.5 to 5.0 A / dm<2>, and the electroplating time is 15 to 30 minutes. The coating obtained by the process is bright, uniform, low in fragility and easy in passivation; the content of nickel in the alloy coating is stable and between 10 and 14 percent; influence of the temperature and the cathode-current density is little; and the process is easy to operate and control.

Description

technical field [0001] The invention relates to a process for electroplating a zinc-nickel alloy, in particular to a process for electroplating a bright zinc-nickel alloy in an alkaline system. Background technique [0002] Electroplating zinc-nickel alloy is a kind of steel anode protective coating that has emerged in the past ten or twenty years. Zinc-nickel alloys usually refer to low-nickel-content alloys with a nickel content of less than 20%. Generally speaking, as long as the nickel content in the alloy layer is 8-15%, it has high corrosion resistance, especially when it is about 13%, it can pass the 5% NaCl neutral salt spray test for 2000 hours. The alloy coating in this range not only has corrosion resistance 7 to 10 times that of galvanized coating, but also has good paintability, weldability and formability, so it can be widely used in automobiles, aerospace, light industry, and home appliances Steel protection in other fields. In addition, because zinc-nickel...

Claims

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Application Information

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IPC IPC(8): C25D3/56
Inventor 宋文超左正忠胡哲周自强
Owner 武汉吉和昌新材料股份有限公司
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