WO2019006622A1

WO2019006622A1 - Passivator, metal workpiece and passivation process therefor

Info

Publication number: WO2019006622A1
Application number: PCT/CN2017/091557
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, a metal workpiece and a passivation process therefor. The passivator comprises, per 1000 parts by weight thereof, the following components in parts by weight: 2-10 parts of chromium chloride, 1-4 parts of cobaltous sulfate, 1-5 parts of manganese sulfate, 0.5-5 parts of nitric acid, 1-6 parts of cerium sulfate, 2-5 parts of sodium molybdate and the balance of distilled water. The passivated zinc-plated plate is formed with a black rigid protective film on a plated surface thereof, greatly increasing the capabilities of anti-corrosion, anti-oxidation and decorativeness, 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 workpiece and passivation treatment method thereof

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

Problem solution

Technical solution

[0005] A passivating agent comprising 1000 parts by weight of the following components in parts by weight: 2-10 parts of chromium chloride, 1-4 parts of cobalt sulfate, 1-5 parts of sulfuric acid Manganese, 0.5-5 parts nitric acid, 1-6 parts barium sulfate, 2-5 parts sodium molybdate and the balance distilled water.

[0006] A metal workpiece passivation treatment method, the metal workpiece surface has a metal plating film, comprising the following steps: preparing a passivating agent as described above, treating the metal plating member with a passivating agent, and controlling the pH value of the solution In the range of 2.0-4.0, after the predetermined turn, the 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 metal workpiece passivation treatment method 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 oxidation resistance and decorative property to the metal and the plating layer, and forms a strong black protective film on the surface of the plating layer after drying, corrosion resistance and oxidation resistance. Sex, decorative and other properties are greatly enhanced, can be widely used in various metal plating parts, especially for galvanizing layer passivation is better, is the plating surface is better anti-corrosion, anti-discoloration. 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, 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] Embodiments of the present invention provide a passivating agent comprising a passivating agent, the passivating agent comprising the following components in a proportion by weight: 1000 parts by weight: 2-10 parts of chromium chloride , 1-4 parts of cobalt sulfate, 1-5 parts of manganese sulfate, 0.5-5 parts of nitric acid, 1-6 parts of barium sulfate, 2-5 parts of sodium molybdate and the balance of distilled water.

[0011] Preferably, the chromium chloride is preferably 4-8 parts by weight. The parts by weight of cobalt sulfate are preferably 2-3 parts by weight. The parts by weight of manganese sulfate are preferably 2-4 parts by weight. The parts by weight of nitric acid are preferably 2-4 parts by weight. The weight fraction of barium sulfate is preferably 2 to 5 parts. The parts by weight of sodium molybdate are preferably 3-4 parts by weight.

[0012] The passivating agent is controlled in the range of 2.0-4.0 using 吋PH value. Among the passivating agents, chromium chloride and barium sulfate are the main components of the passivation film, nitric acid is an oxidizing agent, cobalt sulfate, manganese sulfate is a blackening agent, and sodium molybdate is a promoter.

[0013] The embodiment of the present invention further provides a metal workpiece passivation processing method, the metal workpiece surface has a metal plating film, comprising the following steps: preparing the passivating agent as described above, using a passivating agent solution to the metal plating part The treatment is carried out, and the pH of the control solution is in the range of 2.0-4.0. After the predetermined treatment is performed, a passivation protective film is formed on the surface of the metal plating member, and then naturally dried or dried. The metal plating film is preferably a galvanized film.

[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. The control temperature is preferably 40-60 ° C during the treatment of the passivating solution, and preferably 10-20 seconds between treatments.

[0015] In addition, an embodiment of the present invention further provides a metal workpiece having a metal coating on a surface thereof. The plating layer is formed, for example, by metal plating or electroless plating. A passivation protective film is formed on the metal plating film in accordance with the metal workpiece passivation treatment method 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. With anti-oxidation, decorative properties, etc., it forms a strong black protective film on the surface of the coating after drying. It has greatly enhanced corrosion resistance, oxidation resistance and decorative properties. It is the best choice for anti-corrosion and anti-discoloration of the coating surface. 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 anti-corrosion passivation 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 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 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: 2 parts of chromium chloride, 1 part of cobalt sulfate, 1 part of manganese sulfate, 1 part of nitric acid, 1 part of barium sulfate, 2 parts of sodium molybdate 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 PH value of the passivating agent solution is controlled to be controlled by phosphoric acid or ammonia water at 3.0, the temperature is 40 ° C, and the treatment is performed for 30 seconds. Thereafter, a passivation protective film was formed on the surface of the metal plating member, and after taking out, it was baked at a temperature of 80 ° C for 15 minutes.

[0021] After treatment, the surface of the metal plated part is bright, black and black, uniform color, no pitting, stains and other abnormalities, and the neutral salt spray test is more than 15 hours.

Embodiment 2

[0023] 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: 4 parts of chromium chloride, 2 parts of cobalt sulfate, 2 parts of manganese sulfate, 2 parts of nitric acid, 3 parts of barium sulfate, 3 parts of sodium molybdate and the balance of distilled water, stirred, uniformly mixed, and formulated into 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 PH value of the passivating agent solution is controlled to be controlled by phosphoric acid or ammonia water at 3.5, the temperature is 40 ° C, and the treatment is performed for 25 seconds. After, that is, in metal plating A passivation protective film was formed on the surface of the device, and after removal, it was baked at a temperature of 80 ° C for 15 minutes.

[0025] After treatment, the surface of the metal plated part is bright, black and black, uniform color, no pitting, stains and other abnormalities, and the neutral salt spray test is more than 26 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: 6 parts of chromium chloride, 3 parts of cobalt sulfate, 3 parts of manganese sulfate, 3 parts of nitric acid, 4 parts of barium sulfate, 3 parts of sodium molybdate 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 pH value of the passivating agent solution is controlled to be controlled by phosphoric acid or ammonia water at 4.0, the temperature is 35 ° C, and the treatment is performed for 20 seconds. Thereafter, a passivation protective film was formed on the surface of the metal plating member, and after taking out, it was baked at a temperature of 80 ° C for 15 minutes.

[0029] After treatment, the surface of the metal plated part is bright, black and black, uniform color, no pitting, stains and other abnormalities, and the neutral salt spray test is more than 33 hours.

Embodiment 4

[0031] 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: 8 parts of chromium chloride, 4 parts of cobalt sulfate, 4 parts of manganese sulfate, 4 parts of nitric acid, 5 parts of barium sulfate, 4 parts of sodium molybdate 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 passivating agent solution, and the pH value of the passivating agent solution is controlled to be 4.5 at a phosphoric acid or ammonia water, and the temperature is 45 ° C, and the treatment is performed for 10 seconds. Thereafter, a passivation protective film was formed on the surface of the metal plating member, and after taking out, it was baked at a temperature of 80 ° C for 15 minutes.

[0033] After treatment, the surface of the metal plated part is bright, black and black, uniform color, no pitting, stains and other abnormalities, and the neutral salt spray test is more than 43 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: 10 parts of chromium chloride, 5 parts of cobalt sulfate, 5 parts of manganese sulfate, 5 parts of nitric acid, 6 parts of barium sulfate, 5 parts of sodium molybdate 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 pH value of the passivating agent solution is controlled to be controlled by phosphoric acid or ammonia water at 5.0, the temperature is 40 ° C, and the treatment is performed for 15 seconds. Thereafter, a passivation protective film was formed on the surface of the metal plating member, and after taking out, it was baked at a temperature of 80 ° C for 15 minutes. [0037] After treatment, the surface of the metal plated part is bright, black and black, uniform color, no abnormalities such as pitting and staining, and the neutral salt spray test is more than 38 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 a proportion by weight: based on 1000 parts by weight: 2-10 parts of chromium chloride,

1-4 parts of cobalt sulfate, 1-5 parts of manganese sulfate, 0.5-5 parts of nitric acid, 1-6 parts of barium sulfate, 2-5 parts of sodium molybdate and the balance of distilled water.

[Claim 2] The passivating agent according to claim 1, wherein the chromium chloride has a weight fraction of 4

-8 servings.

[Claim 3] The passivating agent according to claim 1, wherein the cobalt sulfate has a weight fraction of 2

-3 copies.

[Claim 4] The passivating agent according to claim 1, wherein the manganese sulfate has a part by weight of 2

-4 parts.

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

[Claim 6] The passivating agent according to claim 1, wherein the barium sulfate has a weight fraction of 2

- 5 parts and 3-4 parts of sodium molybdate.

[Claim 7] The passivating agent according to claim 1, wherein the PH value is 2.0 to 4.0 adjusted with phosphoric acid or ammonia water, and the treatment temperature is 30 to 80 °C.

[Claim 8] A metal workpiece passivation treatment method, the surface of the metal workpiece having a metal plating film, comprising the steps of: formulating the passivating agent according to any one of claims 1 to 7; The metal plating member is treated with a chemical agent, and the pH of the control solution is in the range of 2.0 to 4.0. After the predetermined time is processed, a passivation protective film is formed on the surface of the metal plating member.

[Claim 9] The metal workpiece passivation treatment method according to claim 7, wherein the treating 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 30-80 ° C, and the treatment time is 5-30 seconds.

[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 metal workpiece passivation treatment method according to claim 8.