WO2018218432A1

WO2018218432A1 - Film passivator, metal component, and passivation treatment method therefor

Info

Publication number: WO2018218432A1
Application number: PCT/CN2017/086355
Authority: WO
Inventors: 王饶玲
Original assignee: 深圳市恒兆智科技有限公司
Priority date: 2017-05-27
Filing date: 2017-05-27
Publication date: 2018-12-06
Also published as: CN110691864A

Abstract

A film passivator, a metal component and a passivation treatment method therefor. The film passivator is used for the surface pretreatment of the metal component. The film passivator comprises the following components in mass contents: 0.2 g/L-8 g/L of titanium potassium oxalate, 0.1 g/L to 0.2 g/L of nitric acid, 0.02 g/L to 0.1 g/L of borofluorhydric acid, and 0.1 g/L to 20 g/L of acidic silicasol. The film passivator can form a corrosion-resistant passivation layer that is colorless to light-colored on an aluminum surface by means of spraying or immersion. The film passivator does not contain chromium ions or other heavy metals harming the environment, and is used for providing a bottom layer for coating treatment, is also used in final treatment, and is a green and environmentally-friendly product.

Description

Title: Film passivation agent, metal parts and passivation treatment method thereof

[0001] The present invention relates to the field of metal surface treatment technology, and in particular, to a film passivating agent, a metal member, and a passivation treatment method thereof.

Background technique

[0002] At present, most electronic products use metal components, and the metal surface is usually treated to improve the surface properties or appearance of the product. It is well known that the surface of steel, zinc, aluminum and their alloys usually requires surface treatment. Moreover, most workpieces require pre-treatment before surface treatment, for example, cleaning, decontamination and degreasing, and metal workpieces for certain applications require process passivation.

[0003] Generally in the mechanical processing and electrical and electronic industries, metal workpieces need to be surface pretreated before coating, such as aluminum alloy parts or steel alloys, which are generally passivated by passivation solution. The traditional passivation agent contains chromium. The composition of phosphorus, phosphorus or other hazardous environments clearly cannot meet the increasingly high environmental requirements.

technical problem

[0004] In view of the above, the invention provides a chromium-free environment-friendly, film-passivating agent which has strong adhesion to coating and strong corrosion resistance, and a metal member passivation treatment method and a metal member obtained by passivation treatment. .

Problem solution

Technical solution

[0005] A film passivating agent comprising the following components in a mass content: titanium oxalate 0.2-8 g/L, nitric acid 0.1-0.2 g/L, fluoroboric acid 0.02-0. lg/L, acidic silica sol 0.1-20 g /L.

[0006] A metal member passivation treatment method, comprising the steps of: formulating a film passivating agent as described above; dissolving the film passivating agent in water to prepare a passivation solution, and controlling the pH to 3.8-5.5; The passivation solution is used to treat the metal parts, and after a predetermined daytime treatment, the metal parts are washed and dried.

And a metal member whose surface is treated by a metal member passivation treatment method as described above.

Advantageous effects of the invention

Beneficial effect

[0008] The above-mentioned film passivating agent has a corrosion-resistant passivation film which forms a colorless to light color on the metal surface, and the passivating agent It does not contain environmentally harmful chromium ions and other heavy metals. It is used to provide a coating treatment base layer and can also be used as a final treatment. It is a green passivation agent. The passivation film formed on the surface of the metal part has good bonding ability with the coating paint film and strong corrosion resistance, and is a new material which is energy-saving, environmentally friendly and pollution-free. Embodiments of the invention

The present invention will be described in detail below with reference to specific embodiments.

[0010] The embodiment of the present invention provides a film passivating agent, comprising the following components in a mass content: titanium oxalate 0.2-8 g / L, nitric acid 0.1-0.2 g / L, fluoroboric acid 0.02-0. lg / L, Acidic silica sol 0.1-20g/L.

[0011] The film passivating agent further includes sodium molybdate, and the sodium molybdate has a mass content of 0-2 g/L. Preferably, the sodium molybdate has a mass content of from 1 to 2 g/L. Specifically, the mass content of the titanium potassium oxalate is preferably from 1 to 4 g/L. The mass content of the fluoroboric acid is preferably 0.04 to 0.08 g/L. The acidic silica sol preferably has a mass content of 2-1 0 g/L. The film passivator has a pH of 3.8-5.5, and the nitric acid solution has a mass concentration of 68 < 3⁄4.

[0012] A metal member passivation treatment method, comprising the steps of: formulating a film passivating agent as described above; pH value is controlled to be 3.8-5.5; treating the metal member with a passivation solution, after a predetermined daytime treatment, Wash the metal parts and dry. The passivation solution treatment metal member is sprayed or impregnated with a metal member by a passivation solution, the spray or immersion enthalpy is 120-240 seconds, and the spray pressure is 0.8-1.2 kgf/cm. Ammonia water is used to adjust the pH.

[0013] Embodiments of the present invention also provide a metal member whose surface is treated by a metal member passivation treatment method as described above. The metal parts can be various aluminum alloy parts, steel alloy parts.

[0014] The film passivating agent has a colorless to light-colored corrosion-resistant passivation film formed on the surface of the metal, and the passivating agent does not contain environmentally harmful chromium ions and other heavy metals, and is used for providing a coating treatment underlayer. It can also be used as a final treatment. It is a green passivator. The passivation film formed on the surface of the metal part has good bonding ability and corrosion resistance, and is a new material which is energy-saving, environmentally friendly and pollution-free.

[0015] In the above film passivating agent, titanium oxalate and sodium molybdate are the main passivation film components, fluoroboric acid is used as a promoter and a buffer pH component, nitric acid provides acidity, and acidic silica sol is used as a filler to adsorb pores in the film. Increase the corrosion resistance of the film.

[0016] Hereinafter, the film passivating agent and the passivation treatment method thereof, and the properties of the metal parts and the like of the embodiment of the present invention will be described by way of specific examples. The following metal parts are all made of aluminum alloy. [0017] Embodiment 1

[0018] The ingredients were mixed according to the following mass ratios: titanium potassium oxalate 200 g, nitric acid 100 g, fluoroboric acid 20 g, acidic silica sol 100 g, and then water was added to 1000 L.

[0019] Treatment method: preparing the film passivating agent as described above; dissolving the film passivating agent in water to prepare a passivation solution, the pH value is controlled to 4.0; treating the surface clean metal parts with a passivation solution, after 10 minutes After the immersion treatment, the metal parts are washed with water and dried.

[0020] After the above passivating agent solution is treated, the surface of the workpiece is observed, and the entire surface is clean and bright, with no water spots, water marks, and the neutral salt spray test of the workpiece is 18 hours or more. After spraying, follow the 2 small boiling water adhesion test, and attach the force rating to 0.

Embodiment 2

[0022] The components were mixed according to the following mass ratio: 1000 g of potassium oxalate, 120 g of nitric acid, 80 g of fluoroboric acid, 1000 g of acidic silica sol, and then water was added to 1000 L.

[0023] Treatment method: preparing the film passivating agent as described above; dissolving the film passivating agent in water to prepare a passivation solution, the pH value is controlled to 5.5; treating the surface clean metal parts with a passivation solution, after 10 minutes After the immersion treatment, the metal parts are washed with water and dried.

[0024] After the above passivation agent solution is treated, the surface of the workpiece is observed, and the entire surface is clean and bright, with no water spots, water marks, and the neutral salt spray test of the workpiece is 36 hours or more. After spraying, follow the 2 small boiling water adhesion test, and attach the force rating to 0.

Embodiment 3

The ingredients were mixed according to the following mass ratios: potassium oxalate 5000 g, 150 g of nitric acid, 50 g of fluoroboric acid, 3000 g of acidic silica sol, and then water was added to 1000 L.

[0027] Treatment method: preparing the film passivating agent as described above; dissolving the film passivating agent in water to prepare a passivation solution, the pH value is controlled to 5.5; treating the surface clean metal parts with a passivation solution, after 10 minutes After the immersion treatment, the metal parts are washed with water and dried.

[0028] After the above-mentioned passivating agent solution treatment, the surface of the workpiece was observed, and the entire surface was clean and bright, with no water spots, water marks, and the neutral salt spray test of the workpiece was 72 hours or more. After spraying, follow the 2 small boiling water adhesion test, and attach the force rating to 0.

[0029] Example 4 [0030] Each component was mixed according to the following mass ratio: 8000 g of potassium oxalate, 200 g of nitric acid, 100 g of fluoroboric acid, 10000 g of acidic silica sol, and then water was added to 1000 L.

[0031] Treatment method: preparing the film passivating agent as described above; dissolving the film passivating agent in water to prepare a passivation solution, the pH value is controlled to 3.8; treating the surface clean metal parts with a passivation solution, after 10 minutes After the immersion treatment, the metal parts are washed with water and dried.

[0032] After the above passivation agent solution is treated, the surface of the workpiece is observed, and the entire surface is clean and bright, with no water spots, water marks, and the neutral salt spray test of the workpiece is more than 48 hours. After spraying, follow the 2 small boiling water adhesion test, and attach the force rating to 0.

[0033] It should be noted that the present invention is not limited to the above embodiments, and other changes may be made by those skilled in the art according to the inventive spirit of the present invention, and the changes according to the inventive spirit of the present invention should be It is intended to be included within the scope of the invention as claimed.

Claims

Claim

[Claim 1] A film passivating agent comprising the following components in a mass content: titanium potassium oxalate

0.2-8g/L, nitric acid 0.1-0.2g/L, fluoroboric acid 0.02-0. lg/L, acidic silica sol 0.1-20g/L

[Claim 2] The film passivating agent according to claim 1, wherein the titanium potassium oxalate has a mass content of from 1 to 4 g/L.

[Claim 3] The film passivating agent according to claim 1, wherein the fluoroboric acid has a mass content of 0.04 to 0.08 g/L.

[Claim 4] The film passivating agent according to claim 1, wherein the acidic silica sol has a mass content of 2 to 10 g/L.

[Claim 5] The film passivating agent according to claim 1, further comprising sodium molybdate, the sodium molybdate having a mass content of 0-2 g/L.

[Claim 6] The film passivating agent according to claim 1, wherein the sodium molybdate has a mass content of from 1 to 2 g/L.

[Claim 7] The film passivating agent according to claim 1, wherein the nitric acid solution has a mass concentration of 68%.

[Claim 8] A method for passivating a metal member, comprising the steps of: formulating a film passivating agent according to any one of claims 1 to 7; dissolving a film passivating agent in water to prepare a passivation solution The pH value is controlled to 3.8-5.5; the metal parts are treated with a passivation solution, and after a predetermined daytime treatment, the metal parts are washed and dried.

[Claim 9] The metal member passivation treatment method according to claim 8, wherein the passivation solution treatment metal member is sprayed or impregnated with a metal member by a passivation solution, the spray or impregnation The daytime is 120-240 seconds, the spray pressure is 0.8-1.2 kgf/cm ² , and the passivation solution is adjusted with a hydrochloric acid neutralizing agent.

[Claim 10] A metal member, characterized in that the surface of the metal member is treated by the metal member passivation treatment method according to claim 8 or 9.