Application of calcium cebacetate, rust-proof oil containing calcium cebacetate and preparation method thereof

Abstract

This invention discloses an application of calcium sucrate, a rust-preventive oil containing calcium sucrate, and its preparation method. Calcium sucrate is used in a rust-preventive oil to prevent rust and corrosion on metal surfaces caused by rainwater erosion, chloride ion corrosion, or carbon dioxide corrosion. The rust-preventive oil comprises the following components by weight percentage: 80%–85% polyalphaolefin base oil, 11%–13% barium petroleum sulfonate, 1%–3% lanolin, and 3%–5% calcium sucrate. This invention significantly improves rust-preventive performance by adding calcium sucrate to the rust-preventive oil. Because sucrate ions are negatively charged, they strongly repel negative ions such as chloride ions, significantly inhibiting the promoting effect of negative ions in the liquid film on the metal surface. The polyhydroxy groups in sucrate ions enhance adsorption to metals and can cross-link with other double bonds such as carbonyl and sulfinyl groups to form new substances, enhancing the density of the oil film and isolating corrosive media. The calcium ions in calcium sucrate can react with carbonate ions ionized in dissolved carbon dioxide water to form carbonates, thereby isolating corrosive media from contact with the base metal.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field corrosion and protection technology, and more specifically, to the application of calcium sucrate, a calcium sucrate-containing rust-preventive oil, and its preparation method. Background Technology

[0002] Natural gas station facilities are exposed to high temperature and high humidity environments for a long time, and are also subject to erosion from rainwater, carbon dioxide and chloride ions. This makes it easy for the organic coating of the station facilities to peel off, leading to rust on exposed parts of steel structural components and severe corrosion of station ancillary facilities (such as exposed bolts and flange gaps). This seriously affects the removability of bolts and the rust blockage of flange gaps, and may even lead to the deterioration of the mechanical properties of bolts and flanges.

[0003] Oil-soluble corrosion inhibitors generally consist of base oil and oil-soluble corrosion-inhibiting materials. Barium petroleum sulfonate is a good corrosion inhibitor and is currently one of the most widely used petroleum sulfonate materials both domestically and internationally, with an addition amount typically ranging from 1% to 10%. Magnesium lanolin soap is a drying agent and film-forming agent, enabling the rust-preventive oil to have a longer rust-preventive period. While current oil-soluble corrosion inhibitors possess certain resistance to damp heat or salt spray corrosion, they do not have resistance to carbon dioxide corrosion. Therefore, current oil-soluble corrosion inhibitors cannot simultaneously possess resistance to damp heat, salt spray, and carbon dioxide corrosion.

[0004] Calcium sucrate is a novel organic substance that is soluble in oil. Currently, calcium sucrate is not used as a corrosion inhibitor or rust remover in rust-preventive oils.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] The problem with existing technologies is that while current rust-removing oils have certain resistance to damp heat or salt spray corrosion, they do not have resistance to carbon dioxide corrosion. In order to solve the above problems, this invention provides an application of calcium sucrate, a rust-preventive oil containing calcium sucrate, and a preparation method thereof. By introducing calcium sucrate as a corrosion inhibitor into the rust-preventive oil, the corrosion resistance of metals in damp heat, carbon dioxide, and salt spray atmospheres can be significantly improved, making it suitable for the protection of exposed substrates in natural gas stations.

[0007] This invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides an application of calcium sucrate for preventing rust and corrosion on metal surfaces.

[0009] In one particular manner, the rusting and corrosion are caused by rainwater erosion, chloride ion or carbon dioxide corrosion.

[0010] In one specific embodiment, the calcium sucrate is prepared as follows: sucrose is saponified in an alkaline potassium hydroxide solution at 80–90°C; then it is decomposed with calcium nitrate to produce calcium sucrate.

[0011] Secondly, the present invention also provides a rust-preventive oil containing calcium sucrate, comprising a polyalphaolefin base oil and calcium sucrate.

[0012] In one particular embodiment, sulfonate rust inhibitors and ester rust inhibitors are also included.

[0013] In one specific embodiment, the sulfonate rust inhibitor is barium petroleum sulfonate.

[0014] In one particular embodiment, the ester-based rust inhibitor is lanolin.

[0015] In one specific embodiment, the rust-preventive oil contains 3% to 5% calcium sucrate.

[0016] In one specific embodiment, the rust-preventive oil comprises the following components by weight percentage: 80%–85% polyalphaolefin base oil, 11%–13% barium petroleum sulfonate, 1%–3% lanolin, and 3%–5% calcium sucrate.

[0017] In one specific embodiment, the viscosity of the rust-preventive oil is 7 mPa·s.

[0018] This invention significantly enhances rust prevention performance by adding calcium sucrate to the rust-preventive oil. Firstly, the negatively charged sucrate ion strongly repels negative ions such as chloride ions, thus significantly inhibiting the promoting effect of negative ions in the liquid film on the metal surface. Secondly, the polyhydroxyl groups in the sucrate ion not only enhance adsorption to metals but, more importantly, can cross-link with other double bonds such as carbonyl and sulfinyl groups to form new substances, further strengthening the oil film's density and isolating it from corrosive media. Finally, the calcium ions in calcium sucrate can react with carbonate ions ionized from dissolved carbon dioxide in water to form carbonates, thereby preventing contact between corrosive media and the base metal. Therefore, this calcium sucrate-containing rust-preventive oil can be applied to the rust protection of exposed metal areas in natural gas stations, exhibiting resistance to damp heat, chloride ions, and carbon dioxide corrosion.

[0019] Thirdly, the present invention also provides a method for preparing a rust-preventive oil containing calcium sucrate, comprising the following steps:

[0020] (1) Heat the polyalphaolefin base oil to 80-85°C;

[0021] (2) Add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0022] (3) Continue heating the solution until the temperature reaches 90°C, add lanolin, and stir thoroughly for 15 minutes until all components are completely and evenly mixed.

[0023] (4) Add calcium sucrate and stir thoroughly for 5 minutes until all components are completely and evenly mixed to obtain rust-preventive oil.

[0024] Fourthly, the present invention also provides a method for using a rust-preventive oil containing calcium sucrate, wherein the rust-preventive oil is applied to a metal surface.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. The present invention provides an application of calcium sucrate, a rust-preventive oil containing calcium sucrate, and a preparation method thereof, which can have the properties of resistance to damp heat, chloride ion and carbon dioxide corrosion, and can be applied to exposed metal parts of natural gas stations to solve the corrosion of uncoated parts and areas where the coating has peeled off in natural gas station facilities.

[0027] 2. The present invention provides an application of calcium sucrate, a rust-preventive oil containing calcium sucrate, and a preparation method thereof. Because sucrate ions are negatively charged, they can strongly repel negative ions such as chloride ions, thereby significantly inhibiting the negative ion-promoting effect in the liquid film on the metal surface.

[0028] 3. The present invention provides an application of calcium sucrate, a rust-preventive oil containing calcium sucrate and a preparation method thereof. The polyhydroxy groups in the sucrate group can not only enhance the adsorption of metals, but also crosslink with other double bonds such as carbonyl and sulfinyl groups to form new substances, thereby further enhancing the compactness of the oil film and playing the role of isolating corrosive media.

[0029] 4. The present invention provides an application of calcium sucrate, a rust-preventive oil containing calcium sucrate, and a preparation method thereof. The calcium ions in calcium sucrate can react with carbonate ions ionized from carbon dioxide dissolved in water to form carbonates, thereby isolating the corrosive medium from contact with the base metal. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 Macroscopic corrosion diagram of a cold-rolled steel sheet without anti-rust oil after simulated corrosion testing;

[0032] Figure 2This is a macroscopic corrosion diagram of a cold-rolled steel sheet after simulated corrosion testing following the application of calcium sucrate-free rust-preventive oil, as provided in Comparative Example 1 of this invention.

[0033] Figure 3 Macroscopic corrosion diagram of cold-rolled steel sheet after simulated corrosion detection following application of 3% calcium sucrate rust-preventive oil as provided in Embodiment 1 of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known materials or methods have not been specifically described in order to avoid obscuring the invention.

[0036] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0" and "5" have been listed in this document; "0-5" is merely a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. Unless otherwise specified, all steps in this application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) can be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0038] Oil-soluble corrosion inhibitors generally consist of base oil and oil-soluble corrosion-inhibiting materials. Barium petroleum sulfonate is a good corrosion inhibitor and is currently one of the most widely used petroleum sulfonate materials both domestically and internationally, with an addition amount typically ranging from 1% to 10%. Magnesium lanolin soap is a drying agent and film-forming agent, enabling the rust-preventive oil to have a longer rust-preventive period. While current oil-soluble corrosion inhibitors possess certain resistance to damp heat or salt spray corrosion, they do not have resistance to carbon dioxide corrosion. Therefore, current oil-soluble corrosion inhibitors cannot simultaneously possess resistance to damp heat, salt spray, and carbon dioxide corrosion.

[0039] To solve the above technical problems,

[0040] In a first aspect, the present invention provides an application of calcium sucrate for preventing rust and corrosion on metal surfaces.

[0041] In one particular manner, the rusting and corrosion are caused by rainwater erosion, chloride ion or carbon dioxide corrosion.

[0042] In one specific embodiment, the calcium sucrate is prepared as follows: sucrose is saponified in an alkaline potassium hydroxide solution at 80–90°C; then it is decomposed with calcium nitrate to produce calcium sucrate.

[0043] Secondly, the present invention also provides a rust-preventive oil containing calcium sucrate, comprising a polyalphaolefin base oil and calcium sucrate.

[0044] In one particular embodiment, sulfonate rust inhibitors and ester rust inhibitors are also included.

[0045] In one specific embodiment, the sulfonate rust inhibitor is barium petroleum sulfonate.

[0046] In one particular embodiment, the ester-based rust inhibitor is lanolin.

[0047] In one specific embodiment, the rust-preventive oil contains 3% to 5% calcium sucrate.

[0048] In one specific embodiment, the rust-preventive oil comprises the following components by weight percentage: 80%–85% polyalphaolefin base oil, 11%–13% barium petroleum sulfonate, 1%–3% lanolin, and 3%–5% calcium sucrate.

[0049] In one specific embodiment, the viscosity of the rust-preventive oil is 7 mPa·s.

[0050] This invention significantly enhances rust prevention performance by adding calcium sucrate to the rust-preventive oil. Firstly, the negatively charged sucrate ion strongly repels negative ions such as chloride ions, thus significantly inhibiting the promoting effect of negative ions in the liquid film on the metal surface. Secondly, the polyhydroxyl groups in the sucrate ion not only enhance adsorption to metals but, more importantly, can cross-link with other double bonds such as carbonyl and sulfinyl groups to form new substances, further strengthening the oil film's density and isolating it from corrosive media. Finally, the calcium ions in calcium sucrate can react with carbonate ions ionized from dissolved carbon dioxide in water to form carbonates, thereby preventing contact between corrosive media and the base metal. Therefore, this calcium sucrate-containing rust-preventive oil can be applied to the rust protection of exposed metal areas in natural gas stations, exhibiting resistance to damp heat, chloride ions, and carbon dioxide corrosion.

[0051] Thirdly, the present invention also provides a method for preparing a rust-preventive oil containing calcium sucrate, comprising the following steps:

[0052] (1) Heat the polyalphaolefin base oil to 80-85°C;

[0053] (2) Add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0054] (3) Continue heating the solution until the temperature reaches 90°C, add lanolin, and stir thoroughly for 15 minutes until all components are completely and evenly mixed.

[0055] (4) Add calcium sucrate and stir thoroughly for 5 minutes until all components are completely and evenly mixed to obtain rust-preventive oil.

[0056] Fourthly, the present invention also provides a method for using a rust-preventive oil containing calcium sucrate, wherein the rust-preventive oil is applied to a metal surface.

[0057] Example 1

[0058] This invention provides a calcium sucrate-containing rust-preventive oil, which is made from the following raw materials by weight: 83% PAO8 (polyalphaolefin base oil), 12% barium petroleum sulfonate rust inhibitor, 3% lanolin rust inhibitor, and 3% calcium sucrate.

[0059] The method for preparing the rust-preventive oil specifically includes:

[0060] (1) Add PAO8 base oil to a beaker, heat the base oil to 80°C using a water bath, then add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0061] (2) Add lanolin when the temperature reaches 90℃ in the first step, stir thoroughly for 15 minutes until all components are completely and evenly mixed.

[0062] (3) Add calcium sucrate to the mixed oil obtained in the second step and stir thoroughly for 5 minutes until all components are completely and evenly mixed.

[0063] Example 2

[0064] This invention provides a calcium sucrate-containing rust-preventive oil, which is made from the following raw materials by weight: 83% PAO8 (polyalphaolefin base oil), 11% barium petroleum sulfonate rust inhibitor, 1% lanolin ester rust inhibitor, and 5% calcium sucrate.

[0065] The method for preparing the rust-preventive oil specifically includes:

[0066] (1) Add PAO8 base oil to a beaker, heat the base oil to 80°C using a water bath, then add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0067] (2) Add lanolin when the temperature reaches 90°C in the first step, and stir thoroughly for 15 minutes until all components are completely and evenly mixed.

[0068] (3) Add calcium sucrate to the mixed oil obtained in the second step and stir thoroughly for 5 minutes until all components are completely and evenly mixed.

[0069] Example 3

[0070] This invention provides a calcium sucrate-containing rust-preventive oil, which is made from the following raw materials by weight: 80% PAO8 (polyalphaolefin base oil), 13% barium petroleum sulfonate rust inhibitor, 2% lanolin rust inhibitor, and 5% calcium sucrate.

[0071] The method for preparing the rust-preventive oil specifically includes:

[0072] (1) Add PAO8 base oil to a beaker, heat the base oil to 80°C using a water bath, then add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0073] (2) Add lanolin when the temperature reaches 90°C in the first step, and stir thoroughly for 15 minutes until all components are completely and evenly mixed.

[0074] (3) Add calcium sucrate to the mixed oil obtained in the second step and stir thoroughly for 5 minutes until all components are completely and evenly mixed.

[0075] Example 4

[0076] This invention provides a calcium sucrate-containing rust-preventive oil, which is made from the following raw materials by weight: 95% PAO8 (polyalphaolefin base oil) and 5% calcium sucrate.

[0077] The method for preparing the rust-preventive oil specifically includes:

[0078] Add PAO8 base oil to a beaker, heat the base oil to 80°C using a water bath, add calcium sucrate, and stir thoroughly for 5 minutes until all components are completely and evenly mixed.

[0079] Comparative Example 1

[0080] The present invention provides a comparative example of a rust-preventive oil, which is made from the following raw materials by weight: 85% PAO8 (polyalphaolefin base oil), 12% barium petroleum sulfonate rust inhibitor, and 3% lanolin ester rust inhibitor.

[0081] The method for preparing the rust-preventive oil specifically includes:

[0082] (1) Add PAO8 base oil to a beaker, heat the base oil to 80°C using a water bath, then add barium petroleum sulfonate and stir thoroughly for 10 minutes until the components are completely and evenly mixed.

[0083] (2) Add lanolin at 90°C and stir thoroughly for 15 minutes. Cool after all components are completely and evenly mixed.

[0084] Comparative Example 2

[0085] The present invention provides a rust-preventive oil made from the following raw materials: 100% PAO8 (polyalphaolefin base oil).

[0086] Test case

[0087] 1. The viscosity of the rust-preventive oils prepared in Examples 1-4 and Comparative Examples 1-2 was determined using an SNB-1 digital rotational viscometer. The test conditions were: rotor #1, rotation speed 60 rpm, and room temperature. The results are shown in Table 1.

[0088] 2. Following the national standard GB / T 10125-2021, resistance to damp heat, carbon dioxide, and salt spray corrosion was tested on metals coated with the rust-preventive oils prepared in Examples 1-4 and Comparative Examples 1-2, with the experimental atmosphere being carbon dioxide. After the corrosion tests, the rust grade of the samples after the salt spray test was evaluated according to the SH / T0081 standard. The rust grades of the steel materials are shown in Table 1. Under the same conditions, the addition of calcium sucrate significantly reduced the degree of corrosion, and in some cases, no obvious corrosion marks were observed on the test plate surface.

[0089] Table 1

[0090] Performance indicators cold-rolled steel sheet Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 Example 4 Viscosity / mPa.s —— 7 6 7 7 7 7 Corrosion level E B E A A A B

[0091] The results show that the addition of calcium sucrate does not affect the viscosity of the rust-preventive oil; the overall viscosity of the rust-preventive oil remains low, allowing it to be applied to metal surfaces.

[0092] The results from Examples 1-3 and Comparative Example 1 and Figures 1-3 It can be seen that, under the same conditions, the surface of the cold-rolled sheet without anti-rust oil is covered with rust and the degree of corrosion is very high; after the cold-rolled sheet is coated with conventional anti-rust oil, although the degree of corrosion is reduced, there are still obvious corrosion marks; after adding calcium sucrate to the anti-rust oil, the degree of corrosion on the surface of the cold-rolled sheet is significantly reduced, and the surface of the cold-rolled sheet is even smooth without obvious corrosion marks.

[0093] The results from Example 4 and Comparative Example 2 show that, under the same conditions, the addition of calcium sucrate significantly improves viscosity and salt spray corrosion resistance, and reduces the corrosion grade to B.

[0094] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An application of calcium sucrate, characterized in that, Used to prevent metal surfaces from rusting and corroding.

2. The application of calcium sucrate according to claim 1, characterized in that, The rust and corrosion are caused by rainwater erosion, chloride ion or carbon dioxide corrosion.

3. The application of calcium sucrate according to claim 1, characterized in that, The method for preparing calcium sucrate is as follows: sucrose is saponified in an alkaline solution at 80-90°C; then it is decomposed with calcium salt to produce calcium sucrate.

4. A rust-preventive oil containing calcium sucrate, characterized in that, It includes polyalphaolefin base oil and calcium sucrate.

5. The rust-preventive oil containing calcium sucrate according to claim 4, characterized in that, It also includes sulfonate rust inhibitors and ester rust inhibitors.

6. The rust-preventive oil containing calcium sucrate according to claim 5, characterized in that, The sulfonate rust inhibitor is barium petroleum sulfonate.

7. The rust-preventive oil containing calcium sucrate according to claim 5, characterized in that, The ester-based rust inhibitor is lanolin.

8. The rust-preventive oil containing calcium sucrate according to claim 4, characterized in that, The rust-preventive oil contains 3% to 5% calcium sucrate.

9. The rust-preventive oil containing calcium sucrate according to claim 4, characterized in that, The rust-preventive oil comprises the following components by weight percentage: 80%–85% polyalphaolefin base oil, 11%–13% barium petroleum sulfonate, 1%–3% lanolin, and 3%–5% calcium sucrate.

10. The rust-preventive oil containing calcium sucrate according to claim 5, characterized in that, The viscosity of the rust-preventive oil is 7 mPa·s.

11. The method for preparing the rust-preventive oil containing calcium sucrate according to any one of claims 4 to 10, characterized in that, Includes the following steps: (1) Heat the polyalphaolefin base oil to 80-85°C; (2) Add barium petroleum sulfonate and mix thoroughly. (3) Continue heating the solution until the temperature reaches 90°C, add lanolin, and stir thoroughly to mix evenly; (4) Add calcium sucrate and mix thoroughly to obtain rust-preventive oil.

12. The method of using the calcium sucrate-containing rust-preventive oil according to any one of claims 4 to 10 or the rust-preventive oil prepared by the method according to claim 11, characterized in that, The rust-preventive oil is applied to the metal surface.

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