WO2019006689A1

WO2019006689A1 - Black phosphatizing agent, metal member and surface phosphatizing method thereof

Info

Publication number: WO2019006689A1
Application number: PCT/CN2017/091757
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: CN110809640A

Abstract

A black 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: 30-50 parts of manganous dihydrogen phosphate, 40-60 parts of zinc nitrate, 2-5 parts of nickel nitrate, 1-4 parts of acetic acid, 1-4 parts of ammonium citrate, and 0.5-2 parts of bismuth molybdate, with the balance being water. The film layer formed by the black phosphatizing agent is dense and even, has good toughness, large thickness, high corrosion resistance, and a little sediment, and is suitable for corrosion resistance treatment of a steel surface.

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 black 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 passivation layer on the surface of the metal member for subsequent surface treatment, thereby increasing the bonding force, corrosion resistance, lubricity, and the like of the subsequent film. For example, screw fasteners, etc., which do not spray and require long-term rust prevention, often require high corrosion resistance and phosphating. However, most of the existing phosphating agents are complicated in process, more sturdy, high in energy consumption, and poor in corrosion resistance.

technical problem

[0004] In view of the above, a black phosphating agent having a dense, uniform, strong, good toughness, a large thickness, and a strong corrosion resistance, and a phosphating treatment method for the surface of the metal member and a phosphating treatment are provided. metallic parts. Problem solution

Technical solution

[0005] A black phosphating agent for forming a film on a surface of a metal member, comprising 1000 parts by weight of the following components by weight: 30-50 parts of manganese dihydrogen phosphate, 40-60 parts of zinc nitrate, 2-5 parts of nickel nitrate, 1-4 parts of acetic acid, 1-4 parts of ammonium citrate, 0.5-2 parts of bismuth molybdate and the balance water.

[0006] A method for phosphating a surface of a metal member, comprising the steps of: formulating a black phosphating agent as described above

The metal member is immersed in the phosphating solution and subjected to a predetermined daytime treatment, washed with water, and dried.

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 black phosphating agent is compounded by manganese dihydrogen phosphate, zinc nitrate and various additives, and the formed film layer is dense and dense, has a large film thickness, high hardness, and strong corrosion resistance. The black phosphating agent is widely used for metal corrosion protection and lubrication.

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 black 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: 30-50 parts of manganese dihydrogen phosphate, 40- 60 parts of zinc nitrate, 2-5 parts of nickel nitrate, 1-4 parts of acetic acid, 1-4 parts of ammonium citrate, 0.5-2 parts of bismuth molybdate and the balance water.

[0011] Specifically, the weight ratio of the manganese dihydrogen phosphate is preferably 35 to 45 parts. The zinc nitrate is preferably used in an amount of from 45 to 55 parts by weight. The nickel nitrate is used in an amount of from 3 to 4 parts by weight. The parts by weight of the acetic acid are preferably from 2 to 3 parts. The parts by weight of the bismuth molybdate are 1-2 parts by weight. The parts by weight of the ammonium citrate are 2-3 parts by weight.

[0012] In the above black phosphating agent, a preferable film forming effect is achieved by controlling the balance of the respective distribution ratios. Among them, ammonium citrate and acetic acid stabilize the bath pH and promote film formation. Manganese dihydrogen phosphate and zinc nitrate are the main film-forming components. Nickel nitrate and bismuth molybdate make the film fine and uniform to increase the corrosion resistance and wear resistance of the phosphating film.

[0013] In the present embodiment, the black phosphating film has a large thickness, a small number of pores, and the phosphating grains are densely granulated, and can be widely applied to steel corrosion prevention. The black phosphating agent is compounded by manganese dihydrogen phosphate, zinc nitrate and various additives. The metal workpiece is immersed in an acidic treatment liquid prepared from 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 the characteristics of large film thickness, high hardness and strong corrosion resistance.

[0014] Embodiments of the present invention also provide a metal component surface phosphating treatment method, comprising the steps of: formulating a black phosphating agent as described above; dissolving the black phosphating agent in water to prepare a phosphating solution, and the metal The piece is immersed in the phosphating solution, and after a predetermined daytime treatment, it is washed with water and dried.

[0015] The metal member is immersed in a phosphating solution. After surface treatment, the black phosphating agent temperature is controlled at 60-80 °C. The metal member is immersed in the mash of the phosphating solution preferably for 15 to 25 minutes. Preferably, before the metal member is immersed in the phosphating solution, the metal workpiece is degreased and pickled, and after the metal member is immersed in the phosphating solution, the metal member may be further immersed in the rust inhibitor or the rust preventive oil to increase the Corrosion resistance. [0016] Embodiments of the present invention also provide a metal member which is processed by a surface phosphating treatment method of a metal member as described above to form a film on the surface of the metal member. The film protects, lubricates and protects the metal parts from corrosion.

[0017] Hereinafter, the black phosphating agent and the treatment method thereof and the like of the embodiments of the present invention will be described by way of specific examples.

Embodiment 1

[0019] The components are mixed in the following parts by weight (total amount of 1000 parts by weight): 30 parts of manganese dihydrogen phosphate, 40 parts of zinc nitrate, 2 parts of nickel nitrate, 1 part of acetic acid, 1 part of ammonium citrate, 0.5 part of molybdenum The acid and the remaining amount of water are stirred, evenly mixed, and formulated into a phosphating agent.

[0020] Phosphating treatment method: According to the above method, the black phosphating agent is prepared; the metal member is exemplified by the iron member, the iron member is immersed in the phosphating solution, and the phosphating solution is controlled at a temperature of 80 ° C for 25 minutes. After the treatment, it is washed with water and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0021] After the phosphating solution was treated, the surface of the workpiece was observed, and it was found that the surface of the workpiece had a black film layer, the color was uniform, and the film was fine. The corrosion resistance was tested by a copper sulfate drop test, and the color was not changed for more than 1 minute.

Embodiment 2

[0023] The components are mixed in the following parts by weight (total amount of 1000 parts by weight): 38 parts of manganese dihydrogen phosphate, 48 parts of zinc nitrate, 3 parts of nickel nitrate, 2 parts of acetic acid, 2 parts of ammonium citrate, 1 part of molybdenum The acid and the remaining amount of water are stirred, evenly mixed, and formulated into a phosphating agent.

[0024] Phosphating treatment method: According to the above method, the black phosphating agent is prepared; the metal member is exemplified by the iron member, the iron member is immersed in the phosphating solution, and the phosphating solution is controlled at a temperature of 80 ° C for 25 minutes. After the treatment, it is washed with water and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0025] After the phosphating solution was treated, the surface of the workpiece was observed, and it was found that the surface of the workpiece had a black film layer, the color was uniform, and the film was fine. The corrosion resistance was tested by a copper sulfate drop test, and the color was not changed for more than 3 minutes.

Embodiment 3

[0027] The components are mixed in the following parts by weight (total amount of 1000 parts by weight): 45 parts of manganese dihydrogen phosphate, 53 parts of zinc nitrate, 4 parts of nickel nitrate, 3 parts of acetic acid, 3 parts of ammonium citrate, 1.5 parts of molybdenum The acid and the remaining amount of water are stirred, evenly mixed, and formulated into a phosphating agent.

[0028] Phosphating treatment method: According to the above method, the black phosphating agent is prepared; the metal member is exemplified by the iron member, the iron member is immersed in the phosphating solution, and the phosphating solution is controlled at a temperature of 70 ° C for 20 minutes. After treatment, washed, dried Dry. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0029] After the phosphating solution was treated, the surface of the workpiece was observed, and it was found that the surface of the workpiece had a black film layer, the color was uniform, and the film was fine. The corrosion resistance was tested by a copper sulfate drop test, and the color was not changed for more than 5 minutes.

Embodiment 4

[0031] The components are mixed in the following parts by weight (total amount is 1000 parts by weight): 50 parts of manganese dihydrogen phosphate, 60 parts of zinc nitrate, 5 parts of nickel nitrate, 4 parts of acetic acid, 4 parts of ammonium citrate, 2 parts of molybdenum The acid and the remaining amount of water are stirred, evenly mixed, and formulated into a phosphating agent.

[0032] Phosphating treatment method: preparing the black phosphating agent according to the above method; taking the iron member as an example, the iron member is immersed in the phosphating solution, and the phosphating solution is controlled at a temperature of 70 ° C for 15 minutes. After the treatment, it is washed with water and dried. During the treatment, phosphating agent can be added to ensure the effect of the working fluid.

[0033] After the phosphating solution was treated, the surface of the workpiece was observed, and it was found that the surface of the workpiece had a black film layer, the color was uniform, and the film was fine. The corrosion resistance was tested by a copper sulfate drop test, and the color was not changed for more than 5 minutes.

[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 black phosphating agent for forming a film on a surface of a metal member, characterized in that it comprises, by weight of 1000 parts by weight, of the following components by weight: 30-50 parts of manganese dihydrogen phosphate, 40- 60 parts of zinc nitrate, 2-5 parts of nickel nitrate, 1-4 parts of acetic acid, 1-4 parts of ammonium citrate, 0.5-2 parts of bismuth molybdate and the balance water.

[Claim 2] The black phosphating agent according to claim 1, wherein the manganese dihydrogen phosphate has a weight fraction of 35 to 45 parts.

[Claim 3] The black phosphating agent according to claim 1, wherein the zinc nitrate has a weight fraction of 45 to 55 parts.

[Claim 4] The black phosphating agent according to claim 1, wherein the nickel nitrate has a weight fraction of 3-4 parts.

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

[Claim 6] The black phosphating agent according to claim 1, wherein the acetic acid is in an amount of from 2 to 3 parts by weight.

[Claim 7] The black phosphating agent according to claim 1, wherein the bismuth molybdate is in an amount of from 1 to 2 parts by weight.

[Claim 8] A method for phosphating a surface of a metal member, comprising the steps of: formulating the black phosphating agent according to any one of claims 1 to 7; immersing the metal member in the phosphating solution, after a predetermined enthalpy After the treatment, it was washed with water and dried.

[Claim 9] The method for phosphating a surface of a metal member according to claim 8, wherein the metal workpiece is degreased, pickled, and phosphatized before the metal member is immersed in the phosphating solution. The temperature is 60-80 °C.

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