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Passivating solution and passivation method for zinc-nickel alloy plating

A technology of nickel alloy and passivation solution, applied in the direction of metal material coating process, etc., can solve the problem of lack of red-brown passivation film reports, etc., and achieve the effect of strong bonding force and good decoration.

Active Publication Date: 2014-04-23
SUZHOU CHANGFENG AVIATION ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the more common passivation film colors are white, iridescent, and black, but there is a lack of relevant reports on reddish-brown passivation films.

Method used

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  • Passivating solution and passivation method for zinc-nickel alloy plating
  • Passivating solution and passivation method for zinc-nickel alloy plating
  • Passivating solution and passivation method for zinc-nickel alloy plating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A zinc-nickel alloy coating passivation solution, the composition comprises chromium oxide, sodium chloride, hydrochloric acid, acetic acid, and it consists of:

[0023]

[0024] Use the above passivation solution to passivate the zinc-nickel alloy coating with 5% Ni and the balance of Zn.

[0025] Step 1: Activation: Activate with hydrochloric acid with a volume fraction of 10% to 15%, and the time is 1S to 3S.

[0026] Step 2: Passivation: Prepare the components of the above passivation solution in proportion and stir evenly to form a passivation solution; immerse the workpiece coated with zinc-nickel alloy coating on the surface into the passivation solution, and pay attention to the workpiece during the treatment process. Shaking, it has been guaranteed to obtain a uniform passivation film, the passivation temperature and time are as follows:

[0027] Temperature: 18~30℃;

[0028] Time: 30~60S;

[0029] Step 3: Washing with flowing cold water: wash off the res...

Embodiment 2

[0034] A zinc-nickel alloy coating passivation solution, the composition comprises chromium oxide, sodium chloride, hydrochloric acid, acetic acid, and it consists of:

[0035]

[0036] Use the above passivation solution to passivate the zinc-nickel alloy coating with 5% Ni and the balance of Zn.

[0037] Step 1: Activation: Activate with hydrochloric acid with a volume fraction of 10% to 15%, for 1S to 3S.

[0038] Step 2: Passivation: Prepare the components of the passivation solution in proportion and stir them evenly to form a passivation solution; immerse the workpiece coated with zinc-nickel alloy coating on the surface into the passivation solution. Note that the workpiece should be shaken during the processing to ensure a uniform passivation film. The passivation temperature and time are as follows:

[0039] Temperature: 18~30℃;

[0040] Time: 30~60S;

[0041] Step 3: Washing with flowing cold water: wash off the residual passivation solution on the surface of t...

Embodiment 3

[0046] A zinc-nickel alloy coating passivation solution, the composition comprises chromium oxide, sodium chloride, hydrochloric acid, acetic acid, and it consists of:

[0047]

[0048]

[0049] Use the above passivation solution to passivate the zinc-nickel alloy coating with 18% Ni and the balance of Zn.

[0050] Step 1: Activation: Activate with hydrochloric acid with a volume fraction of 10% to 15%, for 1S to 3S.

[0051] Step 2: Passivation: Prepare the components of the passivation solution in proportion and stir them evenly to form a passivation solution; immerse the workpiece coated with zinc-nickel alloy coating on the surface into the passivation solution. Note that the workpiece should be shaken during the processing to ensure a uniform passivation film. The passivation temperature and time are as follows:

[0052] Temperature: 18~30℃;

[0053] Time: 30~60S;

[0054] Step 3: Washing with flowing cold water: wash off the residual passivation solution on the...

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Abstract

The invention relates to a pose-processing technology for a zinc-nickel alloy plating, specially relates to a passivating solution and a passivation method for the zinc-nickel alloy plating, and belongs to the field of metal material surface processing. The passivating solution is composed of chrome oxide (CrO3) with a concentration of 18-25 g / L, sodium chloride (NaCl) with a concentration of 8-12 g / L, hydrochloric acid (HCl) with a concentration of 20-25 mL / L, acetic acid (CH3COOH) with a concentration of 18-22 mL / L, and the balance water. The passivating solution does not contain coloring agents, and nickel ions in the zinc-nickel alloy are utilized as a rubefacient. The zinc-nickel alloy plating is in contact with the passivating solution and chemical dissolving takes place, zinc ions and nickel ions generated because of dissolving is reacted with the passivating solution for generating substances such as oxides, chromates and the like; and the substances cover the surface of the plating, and a compact glossy passive film with reddish brown appearance is obtained by performing blow-drying and bake-drying. The reddish brown passive film obtained by utilizing the passivating solution is strong in bonding force with a base material, and is good in protection property and decoration property; and an extremely good passive film can be formed on zinc-nickel alloy platings with different nickel contents.

Description

technical field [0001] The invention relates to a zinc-nickel alloy coating post-treatment process, in particular to a zinc-nickel alloy coating passivation solution and a passivation method thereof, which are applied to the field of metal material surface treatment. Background technique [0002] The zinc-nickel alloy coating itself has high corrosion resistance, but since the main component of the zinc-nickel alloy is zinc, if it is not passivated, it is still relatively easy to corrode in harsh environments, forming zinc oxide or zinc hydroxide Waiting for white embroidery, thus affecting the protection and decoration of the zinc-nickel alloy coating. [0003] According to the application requirements of the coating, appropriate passivation treatment can be carried out on the zinc-nickel alloy to obtain passivation films of different colors. At present, the more common passivation film colors are white, iridescent, and black, but there is a lack of relevant reports on red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/27
Inventor 王琳琳
Owner SUZHOU CHANGFENG AVIATION ELECTRONICS