Rust remover suitable for ferriferrous oxide rust layer and preparation method

Abstract

The invention relates to a rust remover suitable for a ferriferrous oxide rust layer and a preparation method, and the rust remover is prepared from the following components in parts by weight: 5.0 to 15.0 parts of potassium fluoride, 11.0 to 16.0 parts of potassium dichromate, 8.0 to 12.0 parts of sodium ethoxide, 1.0 to 4.0 parts of tridecyl dimethyl benzyl ammonium chloride and 53.0 to 75.0 parts of water. The rust remover can efficiently remove a ferroferric oxide blocking rust layer and other oxide rust layers in the plate heat exchanger, the treatment process and the rust remover preparation method are simple, the ferroferric oxide rust layer can be removed at the normal temperature, and a metal matrix is not corroded.

Description

Technical Field

[0001] The invention relates to a rust remover suitable for ferroferric oxide rust layer and a preparation method thereof, belonging to the technical field of metal surface treatment. Background Art

[0002] The plate heat exchanger of the TDA hydrogenation reactor in the industry adopts the internal heat exchange form, and the circulating water enters and exits from the top. Due to the long-term lack of oxygen in the carbon steel pipe connected to the heat exchanger, ferroferric oxide corrosion products gradually form inside and flow into the bottom of the plate heat exchanger with the circulating water, gradually blocking the internal channel of the plate heat exchanger. Since the plate heat exchanger is built into the reactor and cannot be disassembled, the blockage can only be removed by chemical cleaning. Since ferroferric oxide is composed of Fe 2+ , Fe 3+ , O 2- The trans-spinel structure complex ionic crystals formed. Conventional rust removers cannot remove the ferroferric oxide rust layer or the rust removal effect is poor. Therefore, for the ferroferric oxide rust layer, the development of efficient rust removers is of great significance for maintaining stable operation on site. In the existing rust removal technology, CN201710927658.0 discloses a metal rust remover, which relates to the field of mechanical technology, and is characterized in that the metal rust remover is composed of the following raw materials in parts by weight: 20-25 parts of hydrochloric acid, 15-20 parts of tartaric acid, 5-10 parts of HS-99, 5-10 parts of dodecyl sulfuric acid, and 10-20 parts of additives. The formula of the invention contains a variety of acidic substances, the configuration process is relatively risky and will cause a certain degree of corrosion to the metal matrix, and the formula is not effective for ferroferric oxide rust layers.

[0003] In view of the above-mentioned needs, it is necessary to develop an efficient rust remover for the ferroferric oxide rust layer. Summary of the invention

[0004] The object of the present invention is to provide a rust remover for ferroferric oxide rust layer and a preparation method thereof, which has the characteristics of obvious rust removal effect, simple preparation, being able to remove rust layer at room temperature and not corroding metal substrate.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 5.0-15.0 parts of potassium fluoride, 11.0-16.0 parts of potassium dichromate, 8.0-12.0 parts of sodium ethoxide, 1.0-5.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0007] Preferably, the method is composed of the following raw material components in percentage by mass: 6.0-12.0 parts of potassium fluoride, 12.0-14.0 parts of potassium dichromate, 10.0-12.0 parts of sodium ethoxide, 2.0-4.0 parts of tridecyldimethylbenzylammonium chloride, and the balance is deionized water.

[0008] Further preferably, the method is composed of the following raw material components in percentage by mass: 10.0 parts of potassium fluoride, 12.0 parts of potassium dichromate, 11.0 parts of sodium ethoxide, 3.0 parts of tridecyldimethylbenzylammonium chloride, and the balance is deionized water.

[0009] A method for preparing a rust remover for a ferroferric oxide rust layer, the method comprising the following specific steps: (1) dissolving potassium dichromate in water, then putting it into a reaction kettle, and heating and stirring to allow the potassium dichromate to dissolve completely until the solution is orange-red and transparent; (2) adding sodium ethoxide and potassium fluoride in sequence, and stirring; (3) adding tridecyl dimethyl benzyl ammonium chloride to the reaction kettle, stirring, and then adding the remaining water to the reaction kettle, stirring while adding, until the solution is clear and light yellow, and then cooling to room temperature.

[0010] In the present invention, the amount of water used in step (1) is 1 / 2 to 2 / 3 of the total amount of water used;

[0011] In the present invention, the heating temperature in step (1) is 40-50° C. and the stirring time is 10-20 min.

[0012] In the present invention, the stirring time in step (2) is 10 to 20 minutes;

[0013] In the present invention, the stirring time in step (3) is 10 to 20 minutes.

[0014] The principle of the present invention for rust removal is as follows:

[0015] The fluoride ion has a small radius and a large charge density, and has a strong ability to replace the O in ferroferric oxide. 2- function, thereby initially destroying the stable structure of ferroferric oxide and increasing Fe 2+ and Fe 3+ The leaching rate of dichromate is further oxidized by Fe 2+ Fe 3+ , thereby inhibiting Fe 2+ and Fe 3+ The process of hydrolysis and reaction to generate ferroferric oxide. Sodium ethoxide dissolves in water to generate ethanol and sodium hydroxide. Sodium hydroxide inhibits the hydrolysis of F ions, thereby maintaining the F ion concentration in the solution at a high level and improving the destruction efficiency of the ferroferric oxide structure.

[0016] Dichromate passivates the metal matrix to form new Cr 2 O3 The oxide layer prevents the substrate from contacting with the rust remover and protects the substrate from corrosion. In addition, ethanol, as an organic solvent, plays a role in dispersion and dilution, preventing the local concentration of F ions from being too high to Cr 2 O 3 Oxide layer damage.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the present invention can efficiently remove the ferroferric oxide rust layer on the surface of the metal substrate at room temperature, the reagent configuration is simple, the raw materials are easily available, and no acid mist is generated, which has little harm to the human body. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described.

[0019] Raw materials and sources

[0020] Potassium fluoride, commercial analytical grade reagent

[0021] Potassium dichromate, commercially available analytical grade reagent

[0022] Sodium ethoxide, commercial analytical grade reagent

[0023] Tridecyldimethylbenzyl ammonium chloride, commercially available analytical grade reagent

[0024] Example 1

[0025] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 6.0 parts of potassium fluoride, 12.0 parts of potassium dichromate, 10.0 parts of sodium ethoxide, 2.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0026] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0027] Step 1: Dissolve potassium dichromate in 40 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, stir it for 10 minutes, and allow it to dissolve completely until the solution is orange-red and transparent;

[0028] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0029] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 10 minutes, then add the remaining water to the reaction kettle while stirring until the solution becomes clear and light yellow, and cool to room temperature.

[0030] Example 2

[0031] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 7.0 parts of potassium fluoride, 13.0 parts of potassium dichromate, 12.0 parts of sodium ethoxide, 4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0032] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0033] Step 1: Dissolve potassium dichromate in 45 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, stir it for 10 minutes, and allow it to dissolve completely until the solution is orange-red and transparent;

[0034] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0035] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 10 minutes, then add the remaining water to the reaction kettle while stirring until the solution becomes clear and light yellow, and cool to room temperature.

[0036] Example 3

[0037] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 8.0 parts of potassium fluoride, 12.0 parts of potassium dichromate, 12.0 parts of sodium ethoxide, 5.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0038] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0039] Step 1: Dissolve potassium dichromate in 40 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, and stir it for 20 minutes to allow it to dissolve completely until the solution is orange-red and transparent;

[0040] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0041] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 20 minutes, then add the remaining water to the reaction kettle, stirring while adding until the solution becomes clear and light yellow, and cool to room temperature.

[0042] Example 4

[0043] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 5.0 parts of potassium fluoride, 11.0 parts of potassium dichromate, 8.0 parts of sodium ethoxide, 1.0 part of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0044] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0045] Step 1: Dissolve potassium dichromate in 50 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, and stir it for 20 minutes to allow it to dissolve completely until the solution is orange-red and transparent;

[0046] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0047] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 20 minutes, then add the remaining water to the reaction kettle, stirring while adding until the solution becomes clear and light yellow, and cool to room temperature.

[0048] Example 5

[0049] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 15.0 parts of potassium fluoride, 16.0 parts of potassium dichromate, 12.0 parts of sodium ethoxide, 4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0050] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0051] Step 1: Dissolve potassium dichromate in 30 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, and stir it for 20 minutes to allow it to dissolve completely until the solution is orange-red and transparent;

[0052] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0053] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 20 minutes, then add the remaining water to the reaction kettle, stirring while adding until the solution becomes clear and light yellow, and cool to room temperature.

[0054] Comparative Example 1

[0055] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 15.0 parts of potassium fluoride, 12.0 parts of sodium ethoxide, 4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0056] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0057] Step 1: Sodium ethoxide and potassium fluoride are sequentially placed in 30 parts of deionized water, then placed in a reaction kettle, heated to 50° C., stirred for 20 minutes, and allowed to dissolve completely until the solution is transparent;

[0058] Step 2: Add tridecyldimethylbenzyl ammonium chloride to the reaction kettle and stir for 20 minutes. Then add the remaining water to the reaction kettle while stirring until the solution becomes clear and colorless, and cool to room temperature.

[0059] Comparative Example 2

[0060] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 16.0 parts of potassium dichromate, 12.0 parts of sodium ethoxide, 4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0061] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0062] Step 1: Dissolve potassium dichromate in 30 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, and stir it for 20 minutes to allow it to dissolve completely until the solution is orange-red and transparent;

[0063] Step 2, add sodium ethoxide and stir for 20 minutes;

[0064] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 20 minutes, then add the remaining water to the reaction kettle, stirring while adding until the solution becomes clear and light yellow, and cool to room temperature.

[0065] Comparative Example 3

[0066] A rust remover for ferroferric oxide rust layer is prepared from the following components based on 100 parts by weight: 2.0 parts of potassium fluoride, 16.0 parts of potassium dichromate, 12.0 parts of sodium ethoxide, 4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

[0067] The above-mentioned method for preparing a rust remover for ferroferric oxide rust layer is as follows:

[0068] Step 1: Dissolve potassium dichromate in 30 parts of deionized water, then put it into a reaction kettle, heat it to 50°C, and stir it for 20 minutes to allow it to dissolve completely until the solution is orange-red and transparent;

[0069] Step 2, add sodium ethoxide and potassium fluoride in sequence, and stir for 20 minutes;

[0070] Step 3: add tridecyldimethylbenzyl ammonium chloride to the reaction kettle, stir for 20 minutes, then add the remaining water to the reaction kettle, stirring while adding until the solution becomes clear and light yellow, and cool to room temperature.

[0071] Rust removal effect test:

[0072] Experimental process: Take 100 ml of each of the neutral environmentally friendly rust removers of Examples 1-3 above, add 2 g of ferroferric oxide rust and a 316L standard sheet respectively, soak for different time periods, check the rust removal effect and the corrosion of 316L material and record in detail as shown in Tables 1-3 below.

[0073]

[0074]

[0075] As can be seen from the above data, the present invention has a strong rust removal ability of ferroferric oxide, which can be almost completely removed by soaking for about 30 minutes and has no obvious corrosion effect on the metal substrate. The above description of the embodiments is to facilitate the understanding and use of the invention by ordinary technicians in this technical field. It is obvious that personnel familiar with the technology in this field can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without having to go through creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A rust remover for ferroferric oxide rust layer, which is made of the following ingredients based on 100 parts by weight: 5.0-15.0 parts of potassium fluoride, 11.0-16.0 parts of potassium dichromate, 8.0-12.0 parts of sodium ethoxide, 1.0-5.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

2. The rust remover according to claim 1, characterized in that The invention is composed of the following raw material components in percentage by mass: 6.0-12.0 parts of potassium fluoride, 12.0-14.0 parts of potassium dichromate, 10.0-12.0 parts of sodium ethoxide, 2.0-4.0 parts of tridecyl dimethyl benzyl ammonium chloride, and the balance is deionized water.

3. The rust remover according to claim 1 or 2, characterized in that: The invention is composed of the following raw material components in percentage by mass: 10.0 parts of potassium fluoride, 12.0 parts of potassium dichromate, 11.0 parts of sodium ethoxide, 3.0 parts of tridecyldimethylbenzylammonium chloride, and the balance is deionized water.

4. A method for preparing a rust remover for ferroferric oxide rust layer according to any one of claims 1 to 3, the method comprising the following specific steps: (1) dissolving potassium dichromate in water, then placing the solution in a reaction kettle, and heating and stirring the solution to allow the solution to dissolve completely until the solution is orange-red and transparent; (2) adding sodium ethoxide and potassium fluoride in sequence, and stirring; (3) adding tridecyldimethylbenzylammonium chloride to the reaction kettle, stirring, and then adding the remaining water to the reaction kettle, stirring while adding, until the solution becomes clear and light yellow, and then cooling to room temperature.

5. The preparation method according to claim 4, characterized in that: The amount of water used in step (1) is 1 / 2 to 2 / 3 of the total amount of water used.

6. The preparation method according to claim 4 or 5, characterized in that: The heating temperature in step (1) is 40-50° C. and the stirring time is 10-20 min.

7. The preparation method according to any one of claims 4 to 6, characterized in that: The stirring time in step (2) is 10 to 20 minutes; and / or the stirring time in step (3) is 10 to 20 minutes.

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