WO2019006688A1

WO2019006688A1 - Blackening phosphatizing agent, metal member and surface phosphatizing method thereof

Info

Publication number: WO2019006688A1
Application number: PCT/CN2017/091756
Authority: WO
Inventors: 方招娣
Original assignee: 深圳市长宏泰科技有限公司
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2019-01-10
Also published as: CN110809636A

Abstract

A blackening phosphatizing agent, a metal member and a surface phosphatizing method thereof. The blackening phosphatizing agent is used for forming a film on the surface of a metal member. The black phosphatizing agent comprises, based on 1,000 parts by weight, the following components in parts by weight: 20-50 parts of phosphoric acid, 1-4 parts of nitrobenzenesulfonic acid sodium salt, 10-25 parts of zinc nitrate, 1-3 parts of citric acid, 2-10 parts of sodium tungstate, 0.1-1.0 parts of nickel nitrate, 5-10 parts of zinc oxide, and 0.5-2 parts of sodium fluoroborate, with the balance being water. The film layer formed by the blackening phosphatizing agent is densely crystallized, capable of blackening and brightening, and has good corrosion resistance and decorative properties.

Description

Black phosphating agent, metal parts and surface phosphating treatment method thereof

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

Background technique

[0002] In order to improve the surface properties or appearance of a product, the surface treatment technology of the workpiece is usually applied. For example, the surface treatment of aluminum, iron and their alloys goes deep into all walks of life. Moreover, most of the work needs to be pretreated before surface treatment, for example, cleaning, decontamination and degreasing, and some metal parts need to be phosphated.

[0003] Phosphating treatment generally uses a phosphating agent to pretreat a metal member to form a phosphating layer on the surface of the metal member for subsequent surface treatment, thereby increasing the bonding force and corrosion resistance of the subsequent film. For example, before painting, pipe drawing, spinning, cold forging, and anti-rust treatment of metal parts, it is necessary to form a film on the surface of the metal part to increase the corrosion resistance of the workpiece and increase the adhesion of the subsequent coating. However, the existing surface film of metal parts is insufficient in corrosion resistance and wear resistance, and it is easy to return rust when stored in the crucible.

technical problem

[0004] In view of the above, a blackening phosphating agent having a dense crystal layer, a black hair, a good corrosion resistance, a decorative property, and a good adhesion is provided, and a phosphating treatment method and a surface of the metal member are provided. Metal parts obtained after phosphating.

Problem solution

Technical solution

[0005] A blackening phosphating agent for forming a film on a surface of a metal member, comprising 1000 parts by weight of the following components by weight: 20-50 parts of phosphoric acid, 1-4 parts of m-nitrobenzenesulfonate Sodium, 10-25 parts zinc nitrate, 1-3 parts citric acid, 2-10 parts sodium tungstate, 0.1-1.0 parts nickel nitrate, 5-10 parts zinc oxide, 0.5-2 parts sodium fluoroborate and

[0006] A method for phosphating a surface of a metal member, comprising the steps of: formulating a blackening phosphating agent as described above, immersing the metal member in the phosphating solution, and after a predetermined inter-turn treatment, washing the metal member and drying. And a metal member having a surface having a film formed by a surface phosphating treatment of a metal member as described above.

Advantageous effects of the invention

Beneficial effect

[0008] The film formed by the blackening phosphating agent has a dense crystal structure, is black and bright, has good corrosion resistance and decoration, and is an advanced normal temperature blackening phosphating agent, which can store and lubricate excellently. Oil, its film thickness, high hardness, and strong corrosion resistance.

Embodiments of the invention

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

[0010] Embodiments of the present invention provide a blackening phosphating agent for forming a film on a surface of a metal member, which comprises, by weight of 1000 parts by weight, a component of the following parts by weight: 20-50 parts of phosphoric acid, 1-4 parts Sodium m-nitrobenzenesulfonate, 10-2 5 parts zinc nitrate, 1-3 parts citric acid, 2-10 parts sodium tungstate, 0.1-1.0 parts nickel nitrate, 5-10 parts zinc oxide, 0.5

- 2 parts sodium fluoroborate and the balance water.

[0011] Specifically, the parts by weight of the phosphoric acid are preferably from 30 to 40 parts by weight. The sodium m-nitrobenzenesulfonate is preferably 2-3 parts by weight. The zinc nitrate is in an amount of 15 to 20 parts by weight. The citric acid is preferably present in an amount of from 2 to 3 parts by weight. The nickel nitrate is present in an amount of from 0.4 to 0.8 parts by weight. The sodium tungstate is 4-8 parts by weight. The zinc oxide is 6-8 parts by weight. The sodium fluoroborate is used in an amount of from 1 to 2 parts by weight.

[0012] In the above blackening phosphating agent, a preferable film forming effect is achieved by controlling the balance of the respective distribution ratios. Phosphoric acid provides the main acidity, stabilizes the pH of the bath and is the primary film-forming component. Sodium tungstate, zinc nitrate, and zinc oxide are the main film-forming components. Sodium nitrobenzenesulfonate, citric acid, and nickel nitrate can increase the corrosion resistance of the phosphating film. Sodium fluoroborate acts as an auxiliary film former and increases the film formation rate.

[0013] In the present embodiment, the manganese-based phosphating film has a large thickness, a small number of pores, and the phosphating grains are densely granulated, and can be widely applied to decorative treatment and anti-corrosion treatment. The blackening phosphating agent is a combination of sodium tungstate, zinc salt, phosphate and various additives. The metal workpiece is immersed in a weakly acidic treatment liquid composed of the phosphating solution, and the metal interacts with the acid and the salt to form a protective black film layer which is insoluble in water on the surface of the workpiece. The film is densely crystallized and has good corrosion resistance, decorativeness and adhesion. Can be used with anti-rust oil, better anti-rust effect [0014] Embodiments of the present invention also provide a metal component surface phosphating treatment method, comprising the steps of: preparing a blackening phosphating agent as described above; immersing the metal member in the phosphating solution, after a predetermined daytime treatment , Washed metal parts, dry.

[0015] The metal member is immersed in a phosphating solution. The metal member is immersed in the mash of the phosphating solution preferably for 6 to 9 minutes. Before the metal parts are immersed in the phosphating solution, the metal workpiece is degreased and pickled.

[0016] Embodiments of the present invention also provide a metal member which is processed by a surface phosphating treatment of a metal member as described above to form a film on the surface of the metal member. The film is formed to a thickness of 2 to 10 μm. The film protects the metal, gives it a bright, bright, and has good corrosion, decorative and adhesion. It can be used together with anti-rust oil for better anti-rust effect.

[0017] The blackening phosphating agent and the treatment method thereof and the like in the embodiments of the present invention are described below by way of specific examples.

Embodiment 1

[0019] The components are mixed in the following parts by weight (total amount is 1000 parts by weight): 20 parts of phosphoric acid, 1 part of sodium m-nitrobenzenesulfonate, 10 parts of zinc nitrate, 1 part of citric acid, 2 parts of sodium tungstate , 0.1 parts of nickel nitrate, 5 parts of zinc oxide, 0.5 parts of sodium fluoroborate and the balance of water, stirred, uniformly mixed, and formulated into a phosphating agent.

[0020] Phosphating treatment method: According to the above method, the blackening phosphating agent is prepared; the metal parts are iron parts, for example, the iron parts are degreased, washed with water, then pickled and washed, and then immersed in the phosphating solution at room temperature. Next, after 8 minutes of treatment, the metal parts are washed and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0021] After the treatment of the phosphating solution, the surface of the workpiece was observed, and the surface of the workpiece was found to be black and bright, and the color was uniform.

, the film is fine, copper sulfate drip test does not change color for 100 seconds.

Embodiment 2

[0023] The ingredients are mixed in the following parts by weight (total amount 1000 parts by weight): 30 parts of phosphoric acid, 2 parts of sodium m-nitrobenzenesulfonate, 15 parts of zinc nitrate, 2 parts of citric acid, 5 parts of sodium tungstate , 0.4 parts of nickel nitrate, 7 parts of zinc oxide, 1 part of sodium fluoroborate and the balance of water, stirred, mixed evenly, formulated into a phosphating agent.

[0024] Phosphating treatment method: according to the above method, the blackening phosphating agent is prepared; the metal parts are iron parts, for example, the iron parts are degreased, washed with water, then pickled and washed, and then immersed in the phosphating solution at room temperature. Next, after 8 minutes of treatment, the metal parts are washed and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid. [0025] After the phosphating solution is treated, the surface of the workpiece is observed, and the surface of the workpiece is found to be black and bright, and the color is uniform.

, the film is fine, copper sulfate drip test does not change color for 160 seconds.

Embodiment 3

[0027] The components are mixed in the following parts by weight (total amount 1000 parts by weight): 40 parts of phosphoric acid, 3 parts of sodium m-nitrobenzenesulfonate, 20 parts of zinc nitrate, 2 parts of citric acid, 7 parts of sodium tungstate , 0.7 parts of nickel nitrate, 8 parts of zinc oxide, 1. 5 parts of sodium fluoroborate and the balance of water, stirred, evenly mixed, formulated into a phosphating agent.

[0028] Phosphating treatment method: according to the above method, the blackening phosphating agent is prepared; the metal parts are iron parts, for example, the iron parts are degreased, washed with water, then pickled and washed, and then immersed in the phosphating solution at room temperature. Next, after 8 minutes of treatment, the metal parts are washed and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0029] After the treatment of the phosphating solution, the surface of the workpiece was observed, and the surface of the workpiece was found to be black and bright, and the color was uniform.

, the film is fine, copper sulfate drip test does not change color for 190 seconds.

Embodiment 4

[0031] The components are mixed in the following parts by weight (total amount 1000 parts by weight): 50 parts of phosphoric acid, 4 parts of sodium m-nitrobenzenesulfonate, 25 parts of zinc nitrate, 3 parts of citric acid, 10 parts of sodium tungstate , 1 part of nickel nitrate, 10 parts of zinc oxide, 2 parts of sodium fluoroborate and the balance of water, stirred, mixed evenly, formulated into a phosphating agent.

[0032] Phosphating treatment method: According to the above method, the blackening phosphating agent is prepared; the metal parts are taken as iron, the iron parts are degreased, washed with water, then pickled and washed, and then immersed in the phosphating solution at room temperature. Next, after 8 minutes of treatment, the metal parts are washed and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0033] After the phosphating solution was processed, the surface of the workpiece was observed, and the surface of the workpiece was found to be black and bright, and the color was uniform.

[0034] 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 creative spirit of the present invention, and the changes according to the creative 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 blackening phosphating agent for forming a film on a surface of a metal member, which comprises, by weight of 1000 parts by weight, a component of the following parts by weight: 20-50 parts of phosphoric acid, 1-4 Sodium nitrobenzene sulfonate, 10-25 parts zinc nitrate, 1-3 parts citric acid, 2-10 parts sodium tungstate, 0.1-1.0 parts nickel nitrate, 5-10 parts zinc oxide, 0.5-2 parts Sodium fluoroborate and the balance of water.

[Claim 2] The blackening phosphating agent according to claim 1, wherein the phosphoric acid is in a range of 30 to 40 parts by weight.

[Claim 3] The blackening phosphating agent according to claim 1, wherein the sodium nitrobenzenesulfonate is 2-3 parts by weight, and the nickel nitrate is in parts by weight. 0.4-0.8 parts.

[Claim 4] The blackening phosphating agent according to claim 1, wherein the zinc nitrate is in an amount of 15 to 20 parts by weight.

[Claim 5] The blackening phosphating agent according to claim 1, wherein the citric acid is in an amount of from 2 to 3 parts by weight.

[Claim 6] The blackening phosphating agent according to claim 1, wherein the sodium tungstate is 4-8 parts by weight.

[Claim 7] The blackening phosphating agent according to claim 1, wherein the sodium tungstate is 4-8 parts by weight.

[Claim 8] A method for phosphating a surface of a metal member, comprising the steps of: formulating the blackening phosphating agent according to any one of claims 1 to 7; immersing the metal member in the phosphating solution, after predetermined After the daytime treatment, the metal parts are washed and dried.

[Claim 9] The method for phosphating a surface of a metal member according to claim 8, wherein the metal workpiece is degreased and pickled before the metal member is immersed in the phosphating solution, and the predetermined daytime It is 5-12 minutes.

[Claim 10] A metal member characterized in that the surface of the metal member is formed with a film by the surface phosphating treatment method of the metal member according to claim 8.