Passivating treatment solution for surface of zinc or zinc alloy and passivation treatment method

A passivation treatment, zinc alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of poor anti-corrosion effect and low passivation efficiency, and achieve the effect of reducing surface resistance, fast passivation and reducing hidden dangers

Active Publication Date: 2009-03-04
江苏三耐特种设备制造有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of low passivation efficiency or poor anti-corrosion effect of the existing rare earth passivation process, and to reduce hidden dangers to users by reducing resistance to improve electronic and electromagnetic conductivity, and to provide a A solution for passivation treatment on the surface of zinc or zinc alloy and a process for passivation treatment using the solution

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  • Passivating treatment solution for surface of zinc or zinc alloy and passivation treatment method

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preparation example Construction

[0017] The passivation treatment solution can be prepared according to conventional preparation methods, for example, water-soluble yttrium salt, oxidant, complexing agent and soluble metavanadate are added to water and mixed uniformly, then, the pH of the passivation treatment solution The value is adjusted to 2.0-5.0, preferably 2.5-4, more preferably 3.0-3.5. The amount of each substance is such that in the prepared passivation treatment solution, the content of the water-soluble yttrium salt is 0.01-0.3 mole / liter in terms of yttrium, preferably 0.02-0.1 mole / liter, more preferably 0.05-0.06 mole / liter liter; the content of the oxidizing agent is 0.5-50 g / l, preferably 10-30 g / l, more preferably 15-25 g / l; the content of the complexing agent is 1-10 g / l, preferably 1-2 g / L, more preferably 1.5-1.8 g / L; the content of soluble metavanadate is 0.1-3 g / L, preferably 0.5-2 g / L, more preferably 0.8-1.5 g / L Lift.

[0018] The method for passivating the surface of zinc or zinc a...

Embodiment 1

[0035] Preparation of passivation treatment solution: Weigh 3 grams of yttrium nitrate and 1 gram of trisodium EDTA into a 1-liter beaker, add distilled water and stir until the solids are completely dissolved, then add 0.5 grams of hydrogen peroxide dropwise with a pipette, stir well, weigh and Add 0.5 g of ammonium metavanadate, and finally add distilled water to 1 liter and adjust the pH value to 2.0 with 0.1 mol / liter sodium carbonate solution.

[0036] Passivation treatment method: Take the die-cast zinc alloy product ZA-8, and degrease it through a degreasing solution (NaOH: 5 g / L; Na2CO3: 10 g / L; Na3PO4: 5 g / L; Na2B4O7: 1 g / L) (temperature: 55°C, time: 5 minutes), wash with pure water for 20 seconds; use an activator (fluorosilicic acid: 1 ml / liter; fatty alcohol polyoxyethylene ether (AEO-9): 0.5 g / liter) to degrease the product Conduct activation treatment, activate at room temperature for 3 minutes, wash with pure water for 20 seconds, put the zinc alloy product into...

Embodiment 2

[0038] This embodiment is used to illustrate the passivation treatment solution of the present invention and the passivation treatment method using the passivation treatment solution.

[0039] Preparation of passivation treatment solution: Pour 5 grams of yttrium nitrate and 1.0 grams of sodium citrate into a 1-liter beaker, add distilled water and stir until the solids are completely dissolved, then add 10 grams of hydrogen peroxide and 0.5 grams of ammonium metavanadate and stir well, and finally add Distill water to 1 L and adjust pH to 4.5 with 0.1 mol / L sodium carbonate solution.

[0040]Passivation treatment method: Take ZA-8, a die-cast zinc alloy product, and pass through a degreasing solution (NaOH: 5 g / L; NaOH: 5 g / L; 2 CO 3 : 10 g / L; Na 3 PO 4 : 15 g / L; Na 2 B 4 o 7 : 3 g / L) degreasing (temperature: 55°C, time: 5 minutes), washed with pure water for 3 minutes; then put the zinc alloy product into the passivation treatment solution prepared above for passivatio...

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Abstract

The invention relates to passivation solution of the surface of zinc or zinc alloy, which contains passivation main salt, oxidant, complexing agent, accelerant and water, wherein, the passivation main salt is water soluble yttrium salt, and the accelerant is soluble metavanadate. The invention also provides a method for passivating the surface of zinc or zinc alloy with the passivation slution. Using the passivation solution and passivation process to passivate the surface of zinc or zinc alloy has high passivation speed, good corrosion of the passivating film, reduces the harm to the environment and the surface resistance of the zinc or zinc alloy passivating film layer, improves the electronic and electromagnetic conductibility, and reduces the hidden danger to the users.

Description

technical field [0001] The invention relates to a passivation treatment solution and a passivation treatment method, in particular to a passivation treatment solution and a passivation treatment method for the surface of zinc or zinc alloy. Background technique [0002] In order to improve the corrosion resistance of zinc or zinc alloys (including castings and plating), increase surface gloss and anti-pollution ability, passivation treatment is required to form a dense and stable passivation film on the surface. At present, the passivation method of zinc or zinc alloy surface includes contacting zinc or zinc alloy with passivation solution. According to the composition of passivation solution, passivation method can be divided into hexavalent chromium passivation method and non-hexavalent chromium passivation method . [0003] The passivation solution used in the hexavalent chromium passivation method contains hexavalent chromium, which can form a dense, stable, and corrosi...

Claims

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Application Information

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IPC IPC(8): C23C22/40
Inventor 乔林军
Owner 江苏三耐特种设备制造有限公司
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