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Method for rapidly forming zirconium film on surface of high-strength steel for automobile

A high-strength steel, fast technology, applied in the direction of metal material coating process, etc., can solve the problems of insignificant improvement of zirconium-based conversion coating defects, many cracks in zirconium-based conversion coating, low corrosion resistance, etc., to suppress the generation of hydrogen , Small influence on the environment and human body, the effect of improving the film forming efficiency

Inactive Publication Date: 2021-08-03
NORTHEASTERN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Although the prior art and some published papers have also proposed methods for preparing zirconium-based conversion coatings on the surface of high-strength steel, the zirconium-based conversion coatings produced by the existing preparation methods in a short period of time have many cracks and poor adhesion. and low corrosion resistance, and the improvement of zirconium-based conversion coating defects is not obvious after prolonging the treatment time

Method used

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  • Method for rapidly forming zirconium film on surface of high-strength steel for automobile
  • Method for rapidly forming zirconium film on surface of high-strength steel for automobile
  • Method for rapidly forming zirconium film on surface of high-strength steel for automobile

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preparation example Construction

[0028] b. Preparation of zirconium-based conversion liquid: add 1-7g / L zirconating agent, 2-8g / L oxidizing agent, 0.2-10g / L complexing agent and 0.2-1.5g / L accelerating Agent, mix evenly and let stand;

[0029] c. Preparation of zirconium-based conversion film: Put the prepared zirconium-based conversion liquid in a container, add a pH regulator dropwise at room temperature to adjust the pH value of the zirconium-based conversion liquid to 3.8-4.2, then add water to a constant temperature water bath, and Place the container containing the zirconium-based conversion solution in a water bath and heat it. When the zirconium-based conversion solution reaches 23-27°C, keep the temperature constant, and hang the pretreated substrate in the zirconium-based conversion solution for zirconization treatment for 1-5 Minutes, the zirconium-based conversion solution is continuously stirred during the treatment process, the substrate is taken out after the treatment is completed, washed with...

Embodiment 1

[0032] A method for rapid film formation of zirconium film on the surface of high-strength steel for automobiles, the mass percentage of raw materials is as follows: 3g / L of zirconium agent, 5g / L of oxidizing agent, 4g / L of complexing agent, 0.2g / L of accelerator, and the balance is water.

[0033] Wherein, the zirconating agent is selected from fluozirconic acid.

[0034] Wherein, the oxidizing agent is selected from sodium tungstate.

[0035] Wherein, the complex is selected from ethylenediamineglycolic acid.

[0036] Wherein, the accelerator is calcium chloride.

[0037] According to the method described above, the raw materials are added in order to configure the conversion solution, and the pH of the conversion solution is adjusted to 4.0 by using a pH regulator. The pH regulator can be any pH regulator commonly used in the market; To treat the surface of high-strength steel, the steps are as follows:

[0038] (1) Use industrial alcohol to ultrasonically clean the high-...

Embodiment 2

[0042] A method for rapid film formation of zirconium film on the surface of high-strength steel for automobiles, the mass percentage of raw materials is as follows: 5g / L of zirconium agent, 6g / L of oxidizing agent, 6g / L of complexing agent, 0.6g / L of accelerator, and the balance is water.

[0043] Wherein, the zirconating agent is selected from fluozirconic acid.

[0044] Wherein, the oxidizing agent is selected from sodium tungstate.

[0045] Wherein, the complex is sodium pyrophosphate.

[0046] Wherein, the accelerator is calcium chloride.

[0047] According to the method described above, add raw materials in order to configure the conversion solution, and use the pH regulator to adjust the pH of the conversion solution to 3.9. The pH regulator can be any pH regulator commonly used in the market; To treat the surface of high-strength steel, the steps are as follows:

[0048] (1) Use industrial alcohol to ultrasonically clean the high-strength steel for 4 minutes, wash ...

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Abstract

The invention discloses a method for rapidly forming a zirconium film on the surface of high-strength steel for an automobile. A zirconium-based conversion solution is an aqueous solution and comprises 1-7 g / L of a zirconium agent, 2-8 g / L of an oxidizing agent, 0.2-10 g / L of a complexing agent and 0.2-1.5 g / L of an accelerant, and a pretreated matrix is soaked in the zirconium-based conversion solution with the PH value adjusted for zirconium treatment. The zirconium-based conversion liquid is prepared from the low-cost additive, a high-strength steel substrate with poor surface conditions can be treated, a zirconium-based conversion film with excellent corrosion resistance and adhesion performance is formed on the surface, meanwhile, the novel additive is introduced to improve the film forming performance of the zirconium-based conversion liquid, and the effect of accelerating zirconium film forming is achieved.

Description

technical field [0001] The invention relates to the technical field of preparing chemical conversion films on metal surfaces, in particular to a method for rapidly forming zirconium films on the surface of high-strength steel for automobiles. Background technique [0002] Surface pretreatment refers to the surface treatment of the metal surface before the application of organic coatings and surface treatment to improve adhesion and anti-corrosion performance. One of the pretreatment methods is to use chemical conversion coating technology to deposit the pretreatment solution onto the metal substrate. A dense conversion coating layer is formed on it. Traditionally, the most commonly used surface pretreatment method is phosphate conversion coating technology. Because the metal surface film formed by the phosphating process has the characteristics of hardness, continuity, insolubility, excellent corrosion resistance, non-conductivity and good adhesion, etc., It has been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/36
CPCC23C22/34C23C22/367
Inventor 严森李建中刘包发石俊杰高宣雯于凯
Owner NORTHEASTERN UNIV
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