WO2019000450A1 - Oil removal, rust removal and phosphorization combination coating agent, steel piece and surface coating method therefor - Google Patents

Abstract

An oil removal, rust removal, and phosphorization combination coating agent, a steel piece and a surface coating method therefor. The oil removal, rust removal, and phosphorization combination coating agent is used for pretreatment on the surface of a steel piece, and comprises, on the basis of 1000 parts by weight, the following components in parts by weight: 20-80 parts of phosphoric acid, 6-30 parts of sodium carbonate, 1-4.5 parts of nickel nitrate, 0.1-0.45 parts of copper sulfate, 1-6 parts of sodium molybdate, 0.05-3 parts of citric acid monohydrate, 0.1-3 parts of a surfactant, and the balance of water. The oil removal, rust removal, and phosphorization combination coating agent above can simultaneously remove oil contamination and rust, and form a film layer, the film having a fine layer structure and firm adhesion; and the oil removal, rust removal, and phosphorization combination coating agent can form a colored film on the surface of steel, has a good corrosion resistance and is capable of improving the adhesion of a subsequent coating.

Description

 Degreasing and descaling phosphating three-in-one filming agent, steel parts and film processing method thereof

 Technical field

 [0001] The present invention relates to the technical field of steel surface treatment, and in particular to a degreasing and rusting phosphating triple film coating agent

, steel parts and their surface degreasing, descaling, film treatment methods.

 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, steel and its alloys goes deep into all walks of life. Moreover, most of the workpieces need to be pretreated before surface treatment, for example, cleaning, decontamination and degreasing, and steel parts for certain applications need to be filmed.

 [0003] The filming treatment generally uses a filming agent to pretreat the steel piece to form a film layer on the surface of the steel piece for subsequent surface treatment, thereby increasing the bonding force and corrosion resistance of the subsequent film. For example, before the phosphating treatment, it is necessary to degrease, derust, and adjust the steel parts. It is very complicated and cumbersome to use, and the energy consumption is required. The processing tank needs to be long, and the processing time needs to be long.

 technical problem

 [0004] In view of the above, an easy-to-use, one-time degreasing and rusting phosphating three-in-one film treatment is provided, which saves time and energy consumption. The film structure is fine and the adhesion is firm, as well as the surface treatment method of the steel parts and the steel parts obtained by the film treatment.

 Problem solution

 Technical solution

 [0005] A degreasing and rusting phosphating triple-filming agent for forming a film on a surface of a steel part, comprising 1000 parts by weight, including the following parts by weight: 20-80 parts of phosphoric acid, 6-30 parts Sodium carbonate, 1-4.5 nickel nitrate, 0.1-0.45 parts of copper sulfate, 1-6 parts of sodium molybdate, 0.05-3 parts of citric acid monohydrate, 0.1-3 parts of surfactant, balance of water.

[0006] A method for treating a surface of a steel piece, comprising the steps of: formulating according to any one of claims 1-8 The degreasing and rusting phosphating three-in-one filming agent described in the item; immersing the steel piece in the filming agent solution, after the predetermined daytime treatment, washing the steel piece and drying.

 Further, a steel piece having a surface having a film formed by a surface treatment method of a steel member as described above.

 Advantageous effects of the invention

 Beneficial effect

 [0008] The above-mentioned degreasing and descaling phosphating three-in-one film forming agent has a fine film structure and strong adhesion, and can produce a colored film having good corrosion resistance on the surface of the steel piece.

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 degreasing and rusting phosphating triple film coating agent for surface pretreatment of steel parts, comprising 1000 parts by weight, including the following parts by weight: 20-80 parts of phosphoric acid, 6-30 parts of sodium carbonate, 1-4. 5 nickel nitrate, 0.1-0.45 parts of copper sulfate, 1-6 parts of sodium molybdate, 0.05-3 parts of citric acid monohydrate, 0.1-3 parts of surfactant, balance water.

 [0011] Specifically, the parts by weight of the phosphoric acid are 40-80 parts. Preferably, the weight fraction of the sodium carbonate is 1

0 to 25 parts, the nickel nitrate is preferably 2-4 parts by weight, the copper sulfate is preferably 0.2-0.4 parts by weight, and the sodium molybdate is preferably 2-5 parts by weight. The weight fraction of the citric acid monohydrate is preferably

1- 3 servings. The surfactant is preferably from 1 to 3 parts by weight.

 [0012] In the above-described degreasing and descaling phosphating triple-filming agent, a preferable film forming effect is achieved by controlling the balance of the respective distribution ratios. For example, when the phosphoric acid content is low, the rust removal is slow or the rust is not removed, and the film formation is too slow or too thin to form a film, and if the reaction is too fast, the film formation is too fast, and the newly formed film is dissolved again. The film is not sufficiently strong, so this embodiment is preferably a part by weight of phosphoric acid. Phosphoric acid and molybdenum salts are the main components of the coating layer, surfactants are used as degreasing components, and other components are used as auxiliary components to promote film formation.

 [0013] In the embodiment, the oil-repellent and rust-phosphorating three-in-one film forming agent has a fine structure and strong adhesion, and can remove grease and rust on the surface of the steel piece and form a colored film with good corrosion resistance. .

[0014] An embodiment of the present invention further provides a method for treating a surface of a steel piece, comprising the steps of: preparing a degreasing and phosphating triple-layer film agent as described above; immersing the steel piece in a film solution, Pre-previous After the daytime treatment, the steel parts are washed and dried.

 [0015] Specifically, it is preferred that the steel member is immersed in the coating agent solution for a period of from 3 to 30 minutes.

 [0016] Embodiments of the present invention also provide a steel piece which is treated by a surface filming treatment method of a steel piece as described above to form a film on the surface of the steel piece. The film protects steel parts and has a strong adhesion. Hereinafter, the degreasing and derusting phosphating triple-film agent of the embodiment of the present invention and a treatment method thereof will be described by way of specific examples.

 [0017] Embodiment 1

 [0018] The components are mixed according to the following parts by weight: 1000 parts by weight, 20 parts of phosphoric acid, 6 parts of sodium carbonate, 1 part of nickel nitrate, 0.1 part of copper sulfate, 1 part of sodium molybdate, 0.05 part of citric acid monohydrate , 0.1 part of nonylphenol ethoxylate, the balance of water.

 [0019] Treatment method: preparing a degreasing and phosphating three-in-one film agent; immersing the steel parts in the film agent solution, and washing the steel pieces at room temperature after 30 minutes, and drying. During the treatment, a film agent can be added to ensure the effect of the working fluid. The film drying temperature should not be too high, should be controlled at about 70 degrees to prevent cracks in the film.

 [0020] After the treatment of the above-mentioned film agent solution, the surface of the workpiece is observed, and the surface of the workpiece is found to be colored, free from oil, rust-free, uniform in color, and fine in phosphating. It can be placed in a dry place to ensure no rust in March, after spraying According to the adhesion test of 2 small boiling water, the adhesion level 0 can be used as a good intermediate layer for steel parts coating and can also be used as anti-corrosion treatment.

 Embodiment 2

 [0022] The components are mixed according to the following parts by weight: 40 parts by weight, 40 parts of phosphoric acid, 16 parts of sodium carbonate, 2 parts of nickel nitrate, 0.2 parts of copper sulfate, 2.5 parts of sodium molybdate, 1 part of citric acid monohydrate. , 1 part of nonylphenol ethoxylate, the balance of water.

 [0023] Treatment method: preparing a degreasing and phosphating triple-layer film agent; immersing the steel parts in the film agent solution, and washing the steel pieces at room temperature after 25 minutes, and drying. During the treatment, a film agent can be added to ensure the effect of the working fluid. The film drying temperature should not be too high, should be controlled at about 70 degrees to prevent cracks in the film.

[0024] After the treatment of the above-mentioned film agent solution, the surface of the workpiece is observed, and the surface of the workpiece is found to be colored, free from oil, rust-free, uniform in color, and fine in phosphating. It can be placed in a dry place to ensure no rust in June, after spraying According to the adhesion test of 2 small boiling water, the adhesion level 0 can be used as a good intermediate layer for steel parts coating and can also be used as anti-corrosion treatment.

Embodiment 3

 [0026] The components are mixed according to the following parts by weight: 1000 parts by weight, 60 parts of phosphoric acid, 23 parts of sodium carbonate, 3 parts of nickel nitrate, 0.3 parts of copper sulfate, 4 parts of sodium molybdate, 2 parts of citric acid monohydrate , 2 parts of nonylphenol ethoxylate

, the balance of water.

 [0027] Treatment method: preparing a degreasing and phosphating three-in-one film agent; immersing the steel parts in the film solution, and washing the steel pieces at room temperature after being treated for 20 minutes, and drying. During the treatment, a film agent can be added to ensure the effect of the working fluid. The film drying temperature should not be too high, should be controlled at about 70 degrees to prevent cracks in the film.

 [0028] After the above-mentioned film agent solution treatment, the surface of the workpiece is observed, and the surface of the workpiece is colored, no oil, no rust, uniform color, fine phosphating, and can be placed in a dry place to ensure no rust in December, spray treatment After the adhesion test according to 2 small boiling water, the adhesion level 0 can be used as a good intermediate layer for steel parts coating and can also be used as anti-corrosion treatment.

 Embodiment 4

 [0030] The components are mixed according to the following parts by weight: 80 parts by weight, 80 parts of phosphoric acid, 30 parts of sodium carbonate, 4 parts of nickel nitrate, 0.4 parts of copper sulfate, 5 parts of sodium molybdate, 3 parts of citric acid monohydrate. , 3 parts of nonylphenol ethoxylate

, the balance of water.

 [0031] Treatment method: preparing a degreasing and phosphating triple-layer film agent; immersing the steel piece in the film agent solution, and washing the steel piece at room temperature after 15 minutes, and drying. During the treatment, a film agent can be added to ensure the effect of the working fluid. The film drying temperature should not be too high, should be controlled at about 70 degrees to prevent cracks in the film.

 [0032] After the above-mentioned coating agent solution treatment, the surface of the workpiece is observed, and the surface of the workpiece is colored, no oil, no rust, uniform color, fine phosphating, and can be placed in a dry place to ensure no rust in December, spraying treatment After the adhesion test according to 2 small boiling water, the adhesion level 0 can be used as a good intermediate layer for steel parts coating and can also be used as anti-corrosion treatment.

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 made according to the inventive spirit of the present invention, All should be included in the scope of the claimed invention.

Claims

Claim  [Claim 1] A degreasing and rusting phosphating triple-filming agent for forming a film on a surface of a steel member, characterized in that it comprises, by weight of 1000 parts by weight, a component of the following parts by weight: 20-80 parts Phosphoric acid, 6-30 parts sodium carbonate, 1-4.5 nickel nitrate, 0.1-0.45 parts copper sulfate, 1-6 parts sodium molybdate, 0.0 5-3 parts citric acid monohydrate, 0.1-3 parts surface active ij, The amount of water.  [Claim 2] The degreasing and descaling phosphating triple-filming agent according to claim 1, wherein the phosphoric acid is in an amount of 40 to 80 parts by weight. [Claim 3] The degreasing and rusting phosphating triple-filming agent according to claim 1, wherein the sodium carbonate is 10-25 parts by weight. [Claim 4] The degreasing and descaling phosphating triple-filming agent according to claim 1, wherein the nickel nitrate is in an amount of 2 to 4 parts by weight. [Claim 5] The degreasing and descaling phosphating triple-filming agent according to claim 1, wherein the copper sulfate has a part by weight of 0.2 to 0.4 parts. [Claim 6] The degreasing and descaling phosphating triple-filming agent according to claim 1, wherein the sodium molybdate is in an amount of 2 to 5 parts by weight. [Claim 7] The degreasing and rusting phosphating triple-filming agent according to claim 1, wherein the citric acid monohydrate is in an amount of from 1 to 3 parts by weight. [Claim 8] The degreasing and rusting phosphating triple-filming agent according to claim 1, wherein the surfactant is sodium dodecylbenzenesulfonate or sodium petroleum sulfonate or sulfonium Phenolic polyoxyethylene ether, in parts by weight to 1-3 parts.  [Claim 9] A steel material film processing method comprising the steps of: formulating the degreasing and rusting phosphating triple film coating agent according to any one of claims 1 to 8; immersing the steel piece into the film agent In the solution, after a predetermined daytime treatment, the steel pieces are washed and dried.  [Claim 10] A steel piece, wherein the surface of the steel piece is treated by the steel sheet processing method according to claim 9, and the surface is degreased, derusted, and formed with a film.