Chromium stainless steel wire rod antirust liquid and application thereof

Abstract

The invention belongs to the field of steel processing, and discloses a chromium stainless steel wire rod rust-proof liquid and application thereof.The rust-proof liquid comprises water, phosphoric acid, potassium hydroxide and potassium n-decanoate, the phosphoric acid accounts for 1%-5% of the total volume of the rust-proof liquid, the mass volume ratio of potassium hydroxide to phosphoric acid is 2.2-3.4 kg: 1 L, the concentration of potassium n-decanoate in the rust-proof liquid is 2.5-15 g / L, and the concentration of potassium n-decanoate in the rust-proof liquid is 2.5-15 g / L. And the balance of water. By designing the phosphate-potassium n-decanoate anti-rust liquid, the problem that suspended particulate matter of the ethanol-containing anti-rust liquid is continuously separated out along with evaporation of ethanol can be effectively avoided, and the salt mist resistance and the anti-rust capacity of the treated acid pickling chromium stainless steel wire rod are effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of steel processing, and in particular to a chrome stainless steel disc anti-rust liquid and its application. Background Art

[0002] Wire rod is also called wire rod, which usually refers to small diameter round steel in coils. Chromium stainless steel coil is a stainless steel wire rod with a diameter of 5.5-20mm and a chromium content of 12% to 20%.

[0003] At present, the main methods for rust prevention of chromium stainless steel round plates are pickling, passivation, alkali neutralization, and anti-rust liquid treatment. Commonly used water-based rust inhibitors such as SP410 water-based rust inhibitors have weak acid mist resistance and insufficient anti-rust ability. The anti-rust liquid contains ethanol, insoluble organic matter and fine suspended particles. During use, as ethanol evaporates, suspended particles continue to precipitate, which can easily cause changes in the composition of the anti-rust liquid and affect the anti-rust effect.

[0004] Therefore, finding an anti-rust liquid with good anti-rust effect and strong acid mist resistance has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The purpose of the present application is to provide a chrome stainless steel disc anti-rust liquid to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present application provides a chrome stainless steel round plate anti-rust liquid, the components of which include water, phosphoric acid, potassium hydroxide and potassium decanoate, wherein phosphoric acid accounts for 1%-5% of the total volume of the anti-rust liquid, the mass volume ratio of potassium hydroxide to phosphoric acid is 2.2-3.4kg:1L, the concentration of potassium decanoate in the anti-rust liquid is 2.5-15g / L, and the balance is water.

[0007] Furthermore, the mass concentration of phosphoric acid is ≥85%.

[0008] Furthermore, the potassium hydroxide is solid potassium hydroxide with a purity of 90% or more.

[0009] Furthermore, potassium decanoate is mixed and prepared in a ratio of water: potassium hydroxide: decanoic acid 70-75 L: 10 kg: 9 kg.

[0010] In a second aspect, the present application provides an application of a chrome stainless steel round plate rust-proof liquid, and performs rust-proof treatment on the chrome stainless steel round plate based on the above-mentioned rust-proof liquid.

[0011] Further applications include:

[0012] The chromium stainless steel round disc which has been successively pickled, passivated with concentrated nitric acid and rinsed with high pressure water is placed in a neutralization tank filled with potassium carbonate solution for immersion;

[0013] Put the chromium stainless steel round plate soaked in the neutralization tank into the anti-rust tank filled with anti-rust liquid;

[0014] The chromium stainless steel round disc is dried after being soaked in the anti-rust tank.

[0015] Further, the concentration of the potassium carbonate solution is 3-5 g / L and the temperature is 80-90°C;

[0016] The chromium stainless steel disc is immersed in the neutralization tank for 10-30 seconds.

[0017] Furthermore, the pH value of the potassium carbonate solution is ≥10.

[0018] Further, the temperature of the rust-proof liquid is 85-95°C;

[0019] The chromium stainless steel round plate is immersed in the anti-rust tank for 2-4 minutes.

[0020] Furthermore, the pH value of the rust-proof liquid is 11.8-14.

[0021] Technical effects and advantages of this application:

[0022] The chrome stainless steel round plate anti-rust liquid prepared by the present application adopts phosphate and potassium orthodecanoate, and its acid mist resistance ability is significantly improved compared with the existing anti-rust liquid, and the chrome stainless steel round plate treated by the anti-rust liquid does not rust for more than six months under normal factory storage conditions, and the anti-rust effect is remarkable.

[0023] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the contents recorded in the description and claims. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0025] Wire rod is also called wire rod, which usually refers to small diameter round steel in coils. Chromium stainless steel coil is a stainless steel wire rod with a diameter of 5.5-20mm and a chromium content of 12% to 20%.

[0026] At present, the rust prevention of chromium stainless steel round plates mainly adopts the pickling method. The SP410 water-based rust inhibitor produced by a certain company used in the process has weak acid mist resistance and insufficient rust prevention ability. In addition, the rust-proof liquid contains ethanol, insoluble organic matter and fine suspended particles. During use, with the evaporation of ethanol, suspended particles are continuously precipitated, which can easily cause changes in the composition of the rust-proof liquid and affect the rust prevention effect.

[0027] In order to solve the above problems, the present application provides a rust-proof liquid for chromium stainless steel discs, wherein the components of the rust-proof liquid include water, phosphoric acid, potassium hydroxide and potassium decanoate, wherein the phosphoric acid accounts for 1%-5% of the total volume of the rust-proof liquid, for example, 1%, 2%, 3%, 4% or 5%, and the mass volume ratio of potassium hydroxide to phosphoric acid is 2.2-3.4kg:1L, for example, 2.2kg:1L, 2.4kg:1L, 2.6kg:1L, 2.8kg:1L, 3kg:1L, 3.2kg:1L or 3.4kg:1L; the concentration of potassium decanoate in the rust-proof liquid is 2.5-15g / L, for example, 2.5g / L, 4.5g / L, 6.5g / L, 8.5g / L, 10.5g / L, 12.5g / L or 15g / L, and the balance is water. Furthermore, the mass concentration of phosphoric acid is ≥85%, and potassium hydroxide is solid potassium hydroxide with a purity of more than 90%, and potassium decanoate is prepared by mixing water: potassium hydroxide: decanoic acid 70-75L: 10kg: 9kg. Potassium decanoate is used to prepare the anti-rust liquid. During use, potassium decanoate is not easy to precipitate, and the anti-rust effect is excellent.

[0028] In addition, the present application also provides an application method of the above-mentioned rust-proof liquid, the method comprising:

[0029] 1. Soak the chrome stainless steel round disc, which has been pickled, passivated with concentrated nitric acid and rinsed with high-pressure water, in a neutralization tank filled with potassium carbonate solution for 10-30 seconds. During the soaking process, the concentration of the potassium carbonate solution is controlled at 3-5g / L and the temperature is controlled at 80-90℃. The pH value of the potassium carbonate solution in the neutralization tank is tested every day and the pH value is controlled to be ≥10, so as to reduce the nitric acid that has not been rinsed on the chrome stainless steel round disc from being brought into the anti-rust solution. It is also possible to directly treat the anti-rust solution without going through the neutralization step in the neutralization tank, but this will cause the concentration of nitrate ions in the anti-rust solution to increase rapidly.

[0030] 2. Put the chromium stainless steel round plate soaked in the neutralization tank into the anti-rust tank filled with anti-rust liquid for 2-4 minutes. During the soaking process, the temperature of the anti-rust liquid is controlled to be 85-95°C. The concentrations of potassium decanoate, phosphorus, and potassium in the anti-rust liquid and the pH value of the solution are tested every day. By adding phosphoric acid, potassium hydroxide, and potassium decanoate solution, the phosphoric acid in the anti-rust liquid is controlled to account for 1%-5% of the total volume of the anti-rust liquid. The mass volume ratio of potassium hydroxide to phosphoric acid is 2.2-3.4kg:1L, the concentration of potassium decanoate in the anti-rust liquid is 2.5-15g / L, and the pH value of the solution is 11.8-14.

[0031] 3. Take out the chrome stainless steel round disc after being soaked in the anti-rust pool, bake it in an oven at 70-130°C for 3-7 minutes, and then cool it to room temperature to obtain the chrome stainless steel round disc after anti-rust treatment.

[0032] In order to better illustrate the present invention, the following examples and comparative examples are provided.

[0033] Example 1

[0034] S1: Prepare potassium decanoate solution by mixing water: potassium hydroxide: decanoic acid in a ratio of 70 L: 10 kg: 9 kg.

[0035] S2: The rust-proof liquid is prepared according to the following conditions: (≥85%) industrial phosphoric acid accounts for 1% of the total volume of the rust-proof liquid, the mass volume ratio of (≥90%) potassium hydroxide to (≥85%) industrial phosphoric acid is 2.2kg:1L, the concentration of potassium decanoate in the rust-proof liquid is 2.5 / L, and the balance is water.

[0036] S3: Soak the chromium stainless steel disc, which has been pickled, passivated with concentrated nitric acid and rinsed with high-pressure water, in a neutralization tank containing a potassium carbonate solution at 80°C, a concentration of 3g / L and a pH value of ≥10 for 30 seconds;

[0037] After being soaked in the neutralization tank, the chromium stainless steel round disc is placed in an anti-rust tank filled with an anti-rust liquid at 85°C and a pH value of 11.8 and soaked for 2 minutes;

[0038] The chrome stainless steel round disc soaked in the anti-rust pool is taken out, baked in an oven at 70°C for 7 minutes, and then cooled to room temperature to obtain the chrome stainless steel round disc after rust prevention treatment. The chrome stainless steel round disc includes steel grades 410, 30Cr13, 40Cr13, 50Cr13, and 420F1, and specifications include φ5.5, φ6.0, φ6.5, φ7.5, and φ9.5.

[0039] Example 2

[0040] S1: Prepare potassium decanoate solution by mixing water: potassium hydroxide: decanoic acid in a ratio of 73L: 10kg: 9kg.

[0041] S2: The rust-proof liquid is prepared by 3% industrial phosphoric acid (≥85%) accounting for 3% of the total volume of the rust-proof liquid, the mass volume ratio of (≥90%) potassium hydroxide to (≥85%) industrial phosphoric acid is 2.9kg:1L, the concentration of potassium decanoate in the rust-proof liquid is 8.5g / L, and the balance is water.

[0042] S3: Soak the chromium stainless steel disc after pickling, passivation with concentrated nitric acid and high-pressure water washing in a neutralization tank filled with a potassium carbonate solution at 85°C, a concentration of 4g / L and a pH value of ≥10 for 20 seconds;

[0043] After being soaked in the neutralization tank, the chromium stainless steel round disc is placed in a rust-proof tank filled with 90°C, pH 13 rust-proof liquid and soaked for 3 minutes;

[0044] The chrome stainless steel round disc soaked in the anti-rust pool is taken out, baked in an oven at 100°C for 5 minutes, and then cooled to room temperature to obtain the chrome stainless steel round disc after rust prevention treatment. The chrome stainless steel round disc includes steel grades 410, 30Cr13, 40Cr13, 50Cr13, and 420F1, and specifications include φ5.5, φ6.0, φ6.5, φ7.5, and φ9.5.

[0045] Example 3

[0046] S1: Prepare potassium decanoate solution by mixing water: potassium hydroxide: decanoic acid in a ratio of 75 L: 10 kg: 9 kg.

[0047] S2: The rust-proof liquid is prepared by 5% industrial phosphoric acid (≥85%) accounting for 5% of the total volume of the rust-proof liquid, the mass volume ratio of (≥90%) potassium hydroxide to (≥85%) industrial phosphoric acid is 3.4kg:1L, the concentration of potassium decanoate in the rust-proof liquid is 15 / L, and the balance is water.

[0048] S3: placing the chromium stainless steel round disc, which has been pickled, passivated with concentrated nitric acid and rinsed with high-pressure water, into a neutralization tank filled with a potassium carbonate solution at 90°C, a concentration of 5g / L, and a pH value of ≥10, and soaking for 10 seconds;

[0049] After being soaked in the neutralization tank, the chromium stainless steel round disc is placed in a rust-proof tank filled with 95°C, pH 14 rust-proof liquid and soaked for 4 minutes;

[0050] The chrome stainless steel round disc soaked in the anti-rust pool is taken out, baked in an oven at 130°C for 2 minutes, and then cooled to room temperature to obtain the chrome stainless steel round disc after rust prevention treatment. The chrome stainless steel round disc includes steel grades 410, 30Cr13, 40Cr13, 50Cr13, and 420F1, and specifications include φ5.5, φ6.0, φ6.5, φ7.5, and φ9.5.

[0051] In order to verify the anti-rust effect of the anti-rust liquid of the present application, taking the most rust-prone easy-cutting steel 420F1 as an example, the anti-rust liquid of the present application at different ratios was used to treat the pickled and passivated φ5.5 420F1 round disc with anti-rust treatment. At the same time, the SP410 water-based rust inhibitor produced by Shenyang Parker Sei Co., Ltd. was mixed with water at a volume ratio of 1:11 as a comparative example. Under the same conditions, the pickled and passivated φ5.5 The 420F1 round disc was subjected to anti-rust treatment, and then two groups of salt spray tests were conducted on the round discs treated with two kinds of anti-rust liquids. At 30-35°C, the round disc after anti-rust treatment was placed in a porcelain plate, and a 50g / L sodium chloride solution was atomized and sprayed onto the surface of the round disc. Then the round disc and the porcelain plate were covered with a plastic cover, and the sodium chloride solution was sprayed once every 60 minutes. The time from the first spraying to the appearance of rust spots on the surface of the round disc was taken as the rust-free time, and the ratio of the rust-free time of the anti-rust liquid of the present application to the SP410 water-based rust inhibitor was defined as the relative rust-free time. The experimental results are shown in Tables 1 and 2.

[0052] It can be seen from Tables 1 and 2 that the 420F1 round plate treated with the anti-rust liquid under the various design ratios of this application has a rust-free time of 330-780 minutes under the above acid mist conditions, a relative anti-rust time of 3-7.09, and a significantly improved salt spray resistance compared to the SP410 water-based rust inhibitor.

[0053] In addition, according to statistics, the batch of chrome stainless steel round coils treated with the anti-rust liquid of the present application did not rust after being placed in the factory warehouse for six months, and the anti-rust ability was significantly improved, which met the market demand for storage and anti-rust of chrome stainless steel round coils.

[0054] In summary, the present application provides a phosphate-potassium decanoate anti-rust liquid and an application method thereof, which effectively improves the acid mist resistance, salt mist resistance and rust resistance of chromium stainless steel round plates, can greatly reduce the inventory loss of enterprises, and bring great economic benefits to enterprises.

[0055] Table 1 Salt spray test results

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[0060] Table 2 Salt spray test results II

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[0064] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A chrome stainless steel disc anti-rust liquid, characterized in that: The components of the rust-proof liquid include water, phosphoric acid, potassium hydroxide and potassium decanoate, wherein the phosphoric acid accounts for 1%-5% of the total volume of the rust-proof liquid, the mass volume ratio of potassium hydroxide to phosphoric acid is 2.2-3.4kg:1L, the concentration of potassium decanoate in the rust-proof liquid is 2.5-15g / L, and the balance is water.

2. The rust-proof liquid for chromium stainless steel discs according to claim 1, characterized in that: The mass concentration of the phosphoric acid is ≥85%.

3. The rust-proof liquid for chromium stainless steel discs according to claim 1, characterized in that: The potassium hydroxide is solid potassium hydroxide with a purity of more than 90%.

4. The rust-proof liquid for chromium stainless steel discs according to claim 1, characterized in that: The potassium decanoate is prepared by mixing water: potassium hydroxide: decanoic acid in a ratio of 70-75 L: 10 kg: 9 kg.

5. An application of rust-proof liquid for chromium stainless steel discs, characterized in that: The application is based on the rust-proofing treatment of chromium stainless steel round discs by the rust-proofing liquid described in any one of claims 1 to 4.

6. The use of a chrome stainless steel disc rust-proof liquid according to claim 5, characterized in that: include: The chromium stainless steel round disc which has been successively pickled, passivated with concentrated nitric acid and rinsed with high pressure water is placed in a neutralization tank filled with potassium carbonate solution for immersion; Putting the chromium stainless steel round plate soaked in the neutralization tank into the anti-rust tank filled with the anti-rust liquid for soaking; The chromium stainless steel round disc is dried after being soaked in the anti-rust tank.

7. The use of a chrome stainless steel disc rust-proof liquid according to claim 6, characterized in that: The concentration of the potassium carbonate solution is 3-5 g / L and the temperature is 80-90° C.; The chromium stainless steel disc is immersed in the neutralization tank for 10-30 seconds.

8. The use of a chrome stainless steel disc rust-proof liquid according to claim 6, characterized in that: The pH value of the potassium carbonate solution is ≥10.

9. The use of a chrome stainless steel disc rust-proof liquid according to claim 6, characterized in that: The temperature of the rust-proof liquid is 85-95°C; The chromium stainless steel round plate is immersed in the anti-rust pool for 2-4 minutes.

10. The use of a chrome stainless steel disc rust-proof liquid according to claim 6, characterized in that: The pH value of the rust-proof liquid is 11.8-14.

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