WO2019006607A1

WO2019006607A1 - Passivator, surface passivation process for metal-plated part and metal workpiece

Info

Publication number: WO2019006607A1
Application number: PCT/CN2017/091541
Authority: WO
Inventors: 刘国平
Original assignee: 深圳市宏昌发科技有限公司
Priority date: 2017-07-03
Filing date: 2017-07-03
Publication date: 2019-01-10

Abstract

A passivator and a surface passivation process for a metal-plated part. The passivator comprises, per 1000 parts by weight thereof, the following components in parts by weight: 2-10 parts of sodium molybdate, 0.5-3 parts of potassium dihydrogen phosphate, 2-10 parts of potassium nitrate, 1-5 parts of acetic acid and the balance of distilled water. The protective film formed by the above passivator provides strong passivation, anti-oxidation and anti-corrosion capabilities to metal and plating, forms a transparent rigid protective film on the surface of the plating when dried, which is temperature-, salt- and corrosion-resistant and can be widely applied to a variety of metal-plated parts, and is particularly beneficial to passivation of a nickel-plated layer.

Description

Passivation agent, metal plated surface passivation treatment method and metal workpiece

[0001] The present invention relates to the field of surface treatment technologies, and in particular, to a passivating agent, a surface passivation treatment method for metal plating parts, and a metal workpiece.

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, steel and its electroplated parts, copper and its alloys or the surface treatment of aluminum-magnesium and its alloys go deep into all walks of life. Passivation is a common surface treatment.

[0003] The conventional passivation methods include boiling water method, dichromate method, metal salt method, etc. Although the boiling water passivation method is non-polluting, it is prone to powder frost, affecting the quality appearance and the bonding force between the paint layer and the substrate. And energy consumption is large. The dichromate method has been polluted by the environment and has been eliminated by the existing market. The metal salt method has a variety of ions, and there are some impurity ions, and the impurity ions have a certain interference with the passivation treatment. Moreover, the protective layer produced by the conventional passivation treatment is not dense, is not resistant to temperature, and has poor corrosion resistance.

technical problem

[0004] In view of the above, a passivating agent having strong bonding strength, temperature resistance, corrosion resistance, a surface passivation treatment method for a metal plating member, and a metal workpiece are provided.

Problem solution

Technical solution

[0005] A passivating agent, comprising 1000 parts by weight of the following components by weight: 22-10 parts of sodium molybdate, 0.5-3 parts of potassium dihydrogen phosphate, 2-10 parts of potassium nitrate, 1-5 Part of acetic acid and the balance of distilled water.

[0006] A metal plated surface passivation treatment method, comprising the steps of: preparing a passivating agent as described above, treating the metal plated part with a passivating agent, and controlling the pH of the solution to be in the range of 2.0-5.5, After the predetermined time is processed, a passivation protective film is formed on the surface of the metal plating.

And a metal workpiece having a metal plating film on the surface thereof, wherein the metal plating film is formed with a passivation protective film according to the surface passivation treatment method of the metal plating member as described above.

Advantageous effects of the invention Beneficial effect

[0008] The protective film layer formed by the above passivating agent has strong passivation property and anti-oxidation and anti-corrosion ability to the metal and the plating layer, and forms a colorless and transparent strong protective film on the surface of the plating layer after drying, and has temperature resistance and resistance. Salt and corrosion resistance can be widely used in various metal plating parts, especially for nickel plating. It is a better choice for anti-corrosion and anti-discoloration of the surface of the coating. The process of the above treatment method is easy to operate, and both dip coating and spray coating can be used. The passivating agent is a water-soluble preservative passivating substance. This product is non-toxic, non-combustible, environmentally friendly and easy to use. The protective film formed after the treatment is insoluble in water, has good resistance to vulcanization and moisture resistance, has good toughness of the film layer, and is bendable and deformable. After the passivation treatment of the above passivating agent, the surface of the passivated metal plating member is improved in gloss and hardness, and can be widely applied to various metal plating members.

Embodiments of the invention

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

[0010] An embodiment of the present invention provides a passivating agent comprising a passivating agent, comprising 1000 parts by weight, including the following parts by weight: 2-10 parts of sodium molybdate, 0.5-3 parts of phosphoric acid Potassium hydrogen, 2-10 parts of potassium nitrate, 1-5 parts of acetic acid and the balance of distilled water.

[0011] Preferably, the sodium molybdate is 5-8 parts by weight. The parts by weight of potassium dihydrogen phosphate are preferably 1-2 parts by weight. The parts by weight of potassium nitrate are preferably 4-8 parts by weight. The parts by weight of acetic acid are preferably 2-4 parts by weight.

[0012] The passivating agent is controlled in the range of 2.0-5.5 using the 吋PH value. Among the passivating agents, sodium molybdate and potassium dihydrogen phosphate are the main components of the passivation film. Potassium nitrate provides oxidative properties, and acetic acid provides acidity, which together promotes film formation.

[0013] Embodiments of the present invention also provide a method for surface passivation treatment of a metal plated part, comprising the steps of: preparing a passivating agent as described above, treating the metal plated part with a passivating agent solution, and controlling the pH of the solution The value is in the range of 2.0-5.5. After the predetermined time is processed, a passivation protective film is formed on the surface of the metal plated part, and then dried or naturally dried.

[0014] wherein the treatment of the metal plated member with the passivating agent solution comprises a dipping method, a spraying method or a brushing method, preferably a dipping method. In the treatment of the passivating solution, the control temperature is preferably from 40 to 60 ° C, and the treatment time is preferably from 4 to 8 minutes.

[0015] In addition, an embodiment of the present invention further provides a metal workpiece having a metal plating film on the surface thereof, for example, forming a plating layer by electroless plating on metal plating. Metal plating on the metal plating table as described above The surface passivation treatment method is formed with a passivation protective film.

[0016] The processing object of the above metal plating member may be, but not limited to, a nickel-plated member. After the surface treatment as described above, the surface of the metal workpiece has a good protective effect, and the formed protective film has strong passivation property to the metal and the plating layer. It has anti-oxidation and anti-corrosion ability. After drying, it forms a colorless and transparent solid protective film on the surface of the coating. It has the properties of temperature resistance, salt resistance and corrosion resistance. It has the properties of temperature resistance, moisture resistance and corrosion resistance. It is anti-corrosion on the surface of the coating. The best choice for anti-tarnishing. The process of the above treatment method is simple and easy to operate, and the dip coating can be used. The above passivating agent is a water-soluble antiseptic passivating substance. This product is non-toxic, non-combustible, non-polluting and easy to use. The protective film formed after the treatment is insoluble in water, has good resistance to vulcanization and moisture resistance, has good toughness of the film layer, and is bendable and deformable. In addition to being applied to metal workpieces, passivation agents are also widely used in decorative coatings and corrosion-resistant coatings for hardware machinery, communication equipment, instruments, household appliances, lamps and other products.

[0017] Hereinafter, the composition range, the preparation method, and the use effect of the above-mentioned passivating agent are exemplified by a plurality of embodiments, and the metal workpieces of the following embodiments are all exemplified by steel nickel plated parts.

Embodiment 1

[0019] The components are mixed according to the following parts by weight (based on 1000 total weight fraction): 2 parts of sodium molybdate, 0.5 parts of potassium dihydrogen phosphate, 2 parts of potassium nitrate, 1 part of acetic acid and the balance of distilled water, stirred, mixed Uniform, formulated as a passivating agent.

[0020] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivation solution, and the pH of the passivating solution is controlled at 3.5, the temperature is 65 ° C, and after 10 minutes of treatment, that is, in the metal A passivation protective film was formed on the surface of the plated member, and taken out and dried at 80 ° C for 15 minutes.

[0021] The treated metal plated parts have a bright appearance, uniform color, and a neutral salt spray test of 24 hours or more.

Embodiment 2

[0023] The components are mixed according to the following parts by weight (based on 1000 total weight fraction): 4 parts of sodium molybdate, 1 part of potassium dihydrogen phosphate, 4 parts of potassium nitrate, 2 parts of acetic acid and the balance of distilled water, stirred, mixed Uniform, formulated as a passivating agent.

[0024] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivation solution, and the pH of the passivating solution is controlled at 3.5, the temperature is 65 ° C, and after 10 minutes of treatment, that is, in the metal A passivation protective film was formed on the surface of the plated member, and taken out and dried at 80 ° C for 15 minutes.

[0025] The treated metal plated part has a bright appearance, uniform color, and a neutral salt spray test of 36 hours or more. Embodiment 3

[0027] The components are mixed according to the following parts by weight (based on 1000 total weight fraction): 6 parts of sodium molybdate, 2 parts of potassium dihydrogen phosphate, 5.5 parts of potassium nitrate, 3 parts of acetic acid and the balance of distilled water, stirred, mixed Uniform, formulated as a passivating agent.

[0028] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivation solution, and the pH of the passivating solution is controlled at 3.5, the temperature is 65 ° C, and after 10 minutes of treatment, that is, in the metal A passivation protective film was formed on the surface of the plated member, and taken out and dried at 80 ° C for 15 minutes.

[0029] The treated metal plated parts have a bright appearance, uniform color, and a neutral salt spray test of 48 hours or more.

Embodiment 4

[0031] The components are mixed according to the following parts by weight (based on 1000 total weight fraction): 8 parts of sodium molybdate, 2.5 parts of potassium dihydrogen phosphate, 7 parts of potassium nitrate, 4 parts of acetic acid and the balance of distilled water, stirred, mixed Uniform, formulated as a passivating agent.

[0032] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivating agent solution, and the pH of the passivating agent solution is controlled at 3.5, the temperature is 65 ° C, and after 10 minutes of treatment, that is, in the metal A passivation protective film was formed on the surface of the plated member, and taken out and dried at 80 ° C for 15 minutes.

[0033] The treated metal plated parts have a bright appearance and uniform color, and the neutral salt spray test is more than 72 hours.

Example 5

[0035] The components are mixed according to the following parts by weight (based on 1000 total weight fraction): 10 parts of sodium molybdate, 3 parts of potassium dihydrogen phosphate, 10 parts of potassium nitrate, 5 parts of acetic acid and the balance of distilled water, stirred, mixed Uniform, formulated as a passivating agent.

[0036] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivation solution, and the pH of the passivating solution is controlled at 3.5, the temperature is 65 ° C, and after 10 minutes of treatment, that is, in the metal A passivation protective film was formed on the surface of the plated member, and taken out and dried at 80 ° C for 15 minutes.

[0037] The treated metal plated parts have a bright appearance, uniform color, and a neutral salt spray test of 72 hours or more.

[0038] 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 passivating agent, wherein the passivating agent comprises the following components in parts by weight based on 1000 parts by weight: 2-10 parts of sodium molybdate, 0.5-3 parts of phosphoric acid Potassium hydrogen, 2-10 parts of potassium nitrate, 1-5 parts of acetic acid and the balance of distilled water.

[Claim 2] The passivating agent according to claim 1, wherein the sodium molybdate is 5 parts by weight

-8 servings.

[Claim 3] The passivating agent according to claim 1, wherein the potassium dihydrogen phosphate is in an amount of from 1 to 2 parts by weight.

[Claim 4] The passivating agent according to claim 1, wherein the potassium nitrate has a weight fraction of 4

-8 servings.

[Claim 5] The passivating agent according to claim 1, wherein the acetic acid is in an amount of 2 to 4 parts by weight.

[Claim 6] The passivating agent according to claim 1, wherein the PH value is 2.0 to 5.5, and is adjusted with nitric acid or sodium hydroxide.

[Claim 7] The passivating agent according to claim 1, wherein the passivating agent is used at a temperature of 20 to 80. C.

[Claim 8] A method for surface passivation treatment of a metal plated member, comprising the steps of: preparing a passivating agent according to any one of claims 1 to 7; and performing a metal plated member with a passivating agent After treatment, the pH of the control solution is in the range of 2.0-5.5, and after the predetermined turn, the passivation protective film is formed on the surface of the metal plated part.

[Claim 9] The method for surface passivation treatment of a metal plated part according to claim 7, wherein the treating the metal plated member with the passivating agent solution comprises a dipping method, a spraying method or a brushing method, During the treatment of the passivating solution, the control temperature is 20-80 ° C, and the treatment time is 3-10 minutes.

[Claim 10] A metal workpiece having a metal plating film on a surface thereof, wherein the metal plating film is formed with a passivation protective film according to the surface passivation treatment method of the metal plating member according to claim 8. .