WO2019006618A1

WO2019006618A1 - Passivator, surface processing method of metal-plated part and metal workpiece

Info

Publication number: WO2019006618A1
Application number: PCT/CN2017/091553
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
Also published as: CN110809638A

Abstract

A passivator, a surface processing method of a metal-plated part and a metal workpiece. The passivator comprises, per 1000 parts by weight thereof, the following components in parts by weight: 1-5 parts of chromic anhydride, 0.1-0.5 parts of potassium ferricyanide, 0.5-3 parts of sodium silicate, 0.1-0.5 parts of γ-aminopropyltriethoxysilane, 0.5-4 parts of acetic acid, 0.1-0.5 parts of triethanolamine, 0.1-0.5 parts of sodium fluoride and the balance of distilled water. The passivated zinc-plated plate is formed with a yellow rigid protective film on a plated surface thereof, greatly increasing the capabilities of anti-corrosion, anti-oxidation and anti-sulfuration, can be widely applied to a variety of metal-plated parts, and is particularly beneficial to passivation of a zinc-plated layer.

Description

Passivation agent, metal plated surface treatment method and metal workpiece

[0001] The present invention relates to the field of surface treatment technology, and in particular to a passivating agent, a metal plated surface treatment method, 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 surface treatment methods for electroplated parts go deep into all walks of life. Passivation is a common surface treatment method.

[0003] The conventional passivation method includes a boiling water method, a metal salt method, etc., although the boiling water passivation method is non-polluting, it is prone to powder frosting, affecting the combination of the quality appearance and the lacquer layer and the matrix, and the energy consumption is large. The metal salt method has a plurality 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 after the treatment of the passivation agent 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 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, the passivating agent comprising the following components in parts by weight: 1 - 5 parts of chromic anhydride, 0.1 - 0.5 parts of potassium ferricyanide, 0.5 - 3 parts of silicon Sodium, 0.1-0.5 parts of γ-aminopropyltriethoxysilane, 0.5-4 parts of acetic acid, 0.1-0.5 parts of triethanolamine, 0.1-0.5 parts of sodium fluoride and the balance of distilled water.

[0006] A method for surface 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, controlling the enthalpy value of the solution to be in the range of 2.0-5.0, and processing the predetermined After the daytime, a passivation protective film is formed on the surface of the metal plated part.

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 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 to the metal and the plating layer, and has the properties of oxidation resistance, sulfurization and blackening resistance, and forms a yellow strong protective film on the surface of the plating layer after drying, and has corrosion resistance. It has greatly enhanced properties such as oxidation resistance and resistance to sulfurization and blackening. It can be widely used in various metal plating parts, especially for galvanizing layer passivation. It is a better choice for anti-corrosion and anti-discoloration of coating surface. The process of the above treatment method is easy to operate, and both dip coating and spray 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. After passivation treatment of the above passivating agent, the surface of the passivated metal plated member has improved surface gloss and hardness, and can be widely applied to various metal plated parts.

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 passivating agent comprising a passivating agent comprising, in 1000 parts by weight, the following components in a proportion by weight: 1-5 parts of chromic anhydride, 0.1-0.5 parts potassium ferricyanide, 0.5-3 parts sodium silicate, 0.1-0.5 parts γ-aminopropyl triethoxy silicon, 0.5-4 parts acetic acid, 0.1-0.5 parts triethanolamine, 0.1-0.5 parts Sodium fluoride and the balance of distilled water.

[0011] Preferably, the chromium anhydride is in a range of 2 to 4 parts by weight. The parts by weight of potassium ferricyanide are preferably 0.2 to 0.5 parts by weight.

The parts by weight of sodium silicate are preferably 1.5 to 2.5 parts by weight. The parts by weight of γ-aminopropyltriethoxysilane are preferably 0.2 to 0.4 parts by weight. The parts by weight of acetic acid are preferably from 1 to 3 parts by weight. The parts by weight of triethanolamine are preferably 0.2 to 0.4 parts by weight. The parts by weight of sodium fluoride are preferably 0.2 to 0.4 parts by weight.

[0012] The passivating agent is controlled in the range of 2.0 to 5.0 in use. Among the passivating agents, chromic anhydride is the main component of the passivation film, potassium ferricyanide and sodium fluoride are promoters, and acetic acid and triethanolamine jointly assist in film formation, γ-aminopropyltriethoxysilane and silicic acid. Sodium increases the corrosion resistance of the film.

[0013] Embodiments of the present invention also provide a metal plating part surface treatment method, comprising the steps of: preparing a passivating agent as described above, treating a metal plated part with a passivating agent solution, and controlling a enthalpy value of the solution In the range of 2.0-5.0, after the predetermined time is processed, a passivation protective film is formed on the surface of the metal plating member, and then naturally dried or dried.

[0014] wherein, the passivation solution is used to treat the metal plated part, including the dipping method, the spraying method or the brushing method, preferably For the impregnation method. In the passivation solution treatment, the control temperature is preferably 20 to 40 ° C, and the treatment time is preferably 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 metal plating or electroless plating. A passivation protective film is formed on the metal plating film in accordance with the surface treatment method of the metal plating member as described above.

[0016] The processing object of the above metal plating member may be, but not limited to, a galvanized member. After the surface treatment of the above treatment, 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. And anti-oxidation, anti-sulfurization and blackening properties, after drying, a yellow strong protective film is formed on the surface of the coating. Corrosion resistance, oxidation resistance, resistance to sulfurization and blackening are greatly enhanced, and the surface of the coating is corrosion-resistant and discolor-proof. best choice. 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, 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. In addition to being applied to metal workpieces, passivation is 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 a galvanized piece.

Embodiment 1

[0019] The components are mixed according to the following parts by weight (based on a total weight fraction of 1000). The passivating agent comprises the following components in parts by weight: 1 part of chromic anhydride, 0.1 part of potassium ferricyanide, 0.5 part of silicic acid Sodium, 0.1 part of γ-aminopropyltriethoxysilane, 0.5 part of acetic acid, 0.1 part of triethanolamine, 0.1 part of sodium fluoride and the balance of distilled water, stirred, uniformly mixed, and formulated into a passivating agent.

[0020] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivating agent solution, and the enthalpy value of the passivating agent solution is controlled to be controlled at a temperature of 30 ° C with phosphoric acid or sodium hydroxide. After 8 minutes, a passivation protective film was formed on the surface of the metal plated member, taken out, and dried at a temperature of 80 ° C for 15 minutes.

[0021] The surface of the treated metal plated part is bright, yellow, uniform in color, free from pitting, spotting, etc., and the neutral salt spray test is more than 36 hours.

Embodiment 2

[0023] mixing the components in parts by weight (based on a total weight fraction of 1000), the passivating agent comprises parts by weight The following ingredients are ratio: 2 parts of chromic anhydride, 0.2 parts of potassium ferricyanide, 1.5 parts of sodium silicate, 0.2 parts of γ-aminopropyltriethoxysilane, 1.5 parts of acetic acid, 0.2 parts of triethanolamine, 0.2 parts of fluorine Sodium and the balance of distilled water, stirred, mixed evenly, formulated as a passivating agent.

[0024] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivating agent solution, and the enthalpy value of the passivating agent solution is controlled to be controlled by phosphoric acid or sodium hydroxide at 3.0, and the temperature is 30 ° C. After 8 minutes, a passivation protective film was formed on the surface of the metal plated member, taken out, and dried at a temperature of 80 ° C for 15 minutes.

[0025] After treatment, the surface of the metal plated part is bright, yellow, uniform in color, free from pitting, spotting, etc., and the neutral salt spray test is more than 48 hours.

Embodiment 3

[0027] The components are mixed according to the following parts by weight (based on a total weight fraction of 1000). The passivating agent comprises the following components in parts by weight: 3 parts of chromic anhydride, 0.3 parts of potassium ferricyanide, 2.0 parts of silicic acid Sodium, 0.3 parts of γ-aminopropyltriethoxysilane, 2.5 parts of acetic acid, 0.3 parts of triethanolamine, 0.3 parts of sodium fluoride and the balance of distilled water, stirred, uniformly mixed, and formulated into a passivating agent.

[0028] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivating agent solution, and the enthalpy value of the passivating agent solution is controlled to be controlled by phosphoric acid or sodium hydroxide at 3.0, and the temperature is 30 ° C. After 8 minutes, a passivation protective film was formed on the surface of the metal plated member, taken out, and dried at a temperature of 80 ° C for 15 minutes.

[0029] After treatment, the surface of the metal plated part is bright, yellow, uniform in color, free from pitting, spotting, etc., and the neutral salt spray test is more than 60 hours.

Embodiment 4

[0031] The components are mixed in the following parts by weight (based on a total weight fraction of 1000). The passivating agent comprises the following components in parts by weight: 4 parts of chromic anhydride, 0.4 parts of potassium ferricyanide, 2.5 parts of silicic acid Sodium, 0.4 parts of γ-aminopropyltriethoxysilane, 3 parts of acetic acid, 0.4 parts of triethanolamine, 0.4 parts of sodium fluoride and the balance of distilled water, stirred, uniformly mixed, and formulated into a passivating agent.

[0032] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivation solution, and the enthalpy value of the passivating solution is controlled to be controlled at a temperature of 30 ° C with phosphoric acid or sodium hydroxide. After 8 minutes, a passivation protective film was formed on the surface of the metal plated member, taken out, and dried at 70 ° C for 20 minutes.

[0033] After treatment, the metal plated part has a bright surface, yellow color, uniform color, no abnormalities such as pitting and stains, 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 a total weight fraction of 1000). The passivating agent comprises the following components in parts by weight: 5 parts of chromic anhydride, 0.5 part of potassium ferricyanide, 3 parts of silicic acid Sodium, 0.5 parts of γ-aminopropyltriethoxysilane, 4 parts of acetic acid, 0.5 parts of triethanolamine, 0.5 parts of sodium fluoride and the balance of distilled water, stirred, uniformly mixed, and formulated into a passivating agent.

[0036] Passivation treatment method: After the metal workpiece is coated, the metal plating member is immersed in the passivating agent solution, and the enthalpy value of the passivating agent solution is controlled to be controlled by phosphoric acid or sodium hydroxide at 3.0, and the temperature is 30 ° C. After 8 minutes, a passivation protective film was formed on the surface of the metal plated member, taken out, and dried at a temperature of 80 ° C for 15 minutes.

[0037] After treatment, the surface of the metal plated part is bright, yellow, uniform in color, free from pitting, spotting, etc., and the neutral salt spray test is more than 72 hours.

[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 characterized in that the passivating agent comprises the following components in parts by weight based on 1000 parts by weight: 1-5 parts of chromic anhydride, 0.1-0.5 parts of potassium ferricyanide , 0.5-3 parts of sodium silicate, 0.1-0.5 parts of γ-aminopropyltriethoxysilane, 0.5-4 parts of acetic acid, 0.1-0.5 parts of triethanolamine, 0.1-0.5 parts of sodium fluoride and the balance of distilled water .

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

[Claim 3] The passivating agent according to claim 1, wherein the potassium ferricyanide is 0.2 to 0.4 parts by weight.

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

.5-2.5 parts.

[Claim 5] The passivating agent according to claim 1, wherein the γ-aminopropyltriethoxysilane is 0.2-0.4 parts by weight and 1-3 parts by weight of acetic acid.

[Claim 6] The passivating agent according to claim 1, wherein the triethanolamine is 0.2-0.4 parts by weight and 0.2-0.4 parts by weight of sodium fluoride.

[Claim 7] The passivating agent according to claim 1, wherein the enthalpy value is 2.0-5.0 adjusted with phosphoric acid or sodium hydroxide, and the treatment temperature is 20-80 °C.

[Claim 8] A method for surface treatment of a metal plated member, comprising the steps of: formulating the passivating agent according to any one of claims 1 to 7; treating the metal plated member with a passivating agent, The pH of the control solution is in the range of 2.0 to 5.0, and after the predetermined turn, the passivation protective film is formed on the surface of the metal plated member.

[Claim 9] The surface treatment method for metal plating according to claim 7, wherein the treatment of the metal plating member with the passivating agent solution comprises a dipping method, a spraying method or a brushing method, and is passivated During the treatment of the 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 treatment method of the metal plating member according to claim 8.