Preparation method of long-chain fatty acid surfactant metal plate thermal barrier corrosion-resistant coating

Abstract

The application discloses a kind of long-chain fatty acid surfactant metal plate thermal barrier corrosion inhibition coating preparation method, it is related to the technical field of enhanced ceramic coating product, the excellent comprehensive performance protective coating is formed on stainless steel substrate by specific slurry formulation and preparation process, the surface hardness of the prepared coating is as high as 1950-2100HV, there is no rust after 50 days neutral salt spray test, there is no blister, no rust, no powdering, no peeling after 1000 hours artificial aging, impart excellent corrosion resistance and long-term use stability to substrate, and the friction coefficient is 0.60-0.61, the contact angle reaches 131°-133°, with good skid resistance and high hydrophobic self-cleaning characteristics, simultaneously using long-chain fatty acid flexible segment to improve slurry elastic modulus, thereby synergistically enhancing the wear resistance and corrosion inhibition performance of coating.

Description

Technical Field

[0001] This invention relates to the field of reinforced ceramic coating products, specifically a method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants. Background Technology

[0002] When engineering equipment operates under harsh conditions such as marine environments and industrial atmospheres, the synergistic effect of corrosion and wear can significantly accelerate material failure. This coupled damage manifests as follows: friction damages the protective film on the material surface (such as passivation film and coating), causing fresh metal to be continuously exposed to the corrosive medium. At the same time, the loose layer formed by corrosion products exacerbates abrasive wear. Related studies have shown that the material loss rate under the synergistic effect of corrosion and wear can be 3 to 10 times that under the action of a single factor, seriously threatening the long-term service reliability of key aerospace components and marine engineering equipment.

[0003] To address the engineering challenge of synergistic corrosion-wear damage, surface coating technology offers an effective solution. By constructing a coating with specific functions on the substrate surface, it is possible not only to significantly improve the surface hardness of the material (typically up to 2-5 times that of the substrate), but more importantly, to form a dense protective barrier that effectively blocks the penetration of corrosive media, reducing the corrosion current density by 1-3 orders of magnitude. The key breakthrough of this technology lies in achieving synergistic optimization of wear resistance and corrosion resistance, thereby balancing the mechanical stability and chemical durability of the coating. Based on this, a method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants, in order to solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants includes the following steps: Step 1: Preparation of compound surfactant solution: Place TritiumX-100, fatty acid methyl ester ethyl oxide sulfonate and deionized water in a reaction vessel and stir to mix to obtain compound surfactant solution; Step 2: Ultrasonic deagglomeration: Add potassium polyethylene sulfate to the compound surfactant solution. And fused yttrium stabilized zirconia 8YSZ, which is ultrasonically treated with a high-energy ultrasonic cell disruptor to achieve powder deagglomeration; Step 3: Ball milling and mixing: Add the mixture obtained in Step 2 into a ball mill jar and transfer it to a planetary ball mill for bidirectional ball milling. Step 4: pH adjustment and settling: Pour the ball-milled slurry into a mixing tank, add ammonia water and stir to adjust the pH value, and then let it stand to obtain the coating slurry.

[0006] Based on the above technical solutions, the present invention also provides the following optional technical solutions: In one alternative: in step one, the amount of TrititionX-100 used is 1-2 g / L, the amount of fatty acid methyl ester ethyl oxide sulfonate used is 0.5-1 g / L, and the stirring time is 20-30 min.

[0007] In one alternative approach: the concentration of potassium sulfate in step two is 1 g / L. The concentration of zirconia is 5 g / L, and the concentration of fused yttrium stabilized zirconia 8YSZ is 20 g / L.

[0008] In one alternative: the high-energy ultrasonic cell disruptor used in step two is model JY92-IIN.

[0009] In one alternative: the output power of the high-energy ultrasonic cell disruptor in step two is 80W, and the ultrasonic treatment time is 10min.

[0010] In one alternative: the planetary ball mill in step three is model QM-SP.

[0011] In one alternative: the rotational speed of the planetary ball mill in step three is set to 300 r / min. -1 The process involves rotating clockwise for 30 minutes, then rotating counterclockwise for 30 minutes at the same speed.

[0012] In one alternative: in step four, the amount of ammonia used is 0.5–2 mL / L, and the target pH value is adjusted to pH=6.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through a specific slurry formulation and preparation process, forms a protective coating with excellent comprehensive performance on a stainless steel substrate. The resulting coating has a surface hardness of 1950-2100 HV, shows no rust after a 50-day neutral salt spray test, and exhibits no blistering, rusting, powdering, or peeling after 1000 hours of artificial aging. This endows the substrate with excellent corrosion resistance and long-term stability. Furthermore, the coefficient of friction is 0.60-0.61, and the contact angle reaches 131°-133°, providing good anti-slip properties and high hydrophobic self-cleaning characteristics. Simultaneously, the flexible segments of long-chain fatty acids are used to improve the elastic modulus of the slurry, thereby synergistically enhancing the wear resistance and corrosion inhibition performance of the coating. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the process steps of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] Example 1 A method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants includes the following steps: Example 2 A method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants includes the following steps: Performance testing: After the coated blank stainless steel plates from the above embodiments were dried, their hardness, contact angle, coefficient of friction, salt spray resistance (50 days), and artificial aging resistance were measured. The test results are shown in Table 1. Table 1 As shown in Table 1, the performance of the coated blank stainless steel plates obtained in Examples 1-2 of this invention is within the performance standard range. Therefore, the method for preparing a long-chain fatty acid surfactant thermal barrier corrosion inhibitor coating for metal plates provided by this invention uses a compound surfactant system containing Triton X-100 and FMES, combined with PVSK, A coating slurry was prepared using fused yttrium stabilized zirconium oxide 8YSZ, with a specific concentration ratio, 80W ultrasonic deagglomeration and 300r / min planetary forward and reverse ball milling process, combined with ammonia water to adjust the pH to 6. The aim was to protect the slurry formulation and preparation process, thereby preparing a thermal barrier corrosion inhibitory coating for metal plates. The coating can make the stainless steel surface hardness reach 1950-2100HV, with no rust after 50 days of neutral salt spray, and no blistering, rusting, powdering or peeling after 1000 hours of artificial aging. The coefficient of friction is 0.60-0.61, and the contact angle is 131°-133°. It has high hardness, excellent corrosion resistance, aging stability, good wear resistance and high hydrophobic self-cleaning properties, which significantly improves the comprehensive protection capability of metal substrates. It should be noted that fused yttrium stabilized zirconia 8YSZ is a fully stable cubic phase zirconia material prepared by fusion process with 8 mol% yttrium oxide as a stabilizer. It suppresses the volume expansion and cracking caused by the room temperature phase transformation of zirconia by yttrium oxide and has the characteristics of high melting point, high density, low impurity content, good high temperature stability, low thermal conductivity and excellent oxygen ion conductivity.

[0017] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for preparing a thermal barrier corrosion inhibitor coating for metal plates using long-chain fatty acid surfactants, characterized in that, Includes the following steps: Step 1: Preparation of compound surfactant solution: Place TritiumX-100, fatty acid methyl ester ethyl oxide sulfonate and deionized water in a reaction vessel and stir to mix to obtain compound surfactant solution; Step 2: Ultrasonic deagglomeration: Add potassium polyethylene sulfate to the compound surfactant solution. And fused yttrium stabilized zirconia 8YSZ, which is ultrasonically treated with a high-energy ultrasonic cell disruptor to achieve powder deagglomeration; Step 3: Ball milling and mixing: Add the mixture obtained in Step 2 into a ball mill jar and transfer it to a planetary ball mill for bidirectional ball milling. Step 4: pH adjustment and settling: Pour the ball-milled slurry into a mixing tank, add ammonia water and stir to adjust the pH value, and then let it stand to obtain the coating slurry.

2. The method for preparing a long-chain fatty acid surfactant-based thermal barrier corrosion inhibitor coating for metal plates according to claim 1, characterized in that, In step one, the dosage of TrititionX-100 is 1-2 g / L, the dosage of fatty acid methyl ester ethyl oxide sulfonate is 0.5-1 g / L, and the stirring time is 20-30 min.

3. The method for preparing a long-chain fatty acid surfactant-based thermal barrier corrosion inhibitor coating for metal plates according to claim 1, characterized in that, In step two, the concentration of potassium sulfate in polyethylene is 1 g / L. The concentration of zirconia is 5 g / L, and the concentration of fused yttrium stabilized zirconia 8YSZ is 20 g / L.

4. The method for preparing a long-chain fatty acid surfactant-based thermal barrier corrosion inhibitor coating for metal plates according to claim 1, characterized in that, The high-energy ultrasonic cell disruptor used in step two is model JY92-IIN.

5. The method for preparing a long-chain fatty acid surfactant-based thermal barrier corrosion inhibitor coating for metal plates according to claim 4, characterized in that, In step two, the high-energy ultrasonic cell disruptor has an output power of 80W and an ultrasonic treatment time of 10 minutes.

6. The method for preparing a long-chain fatty acid surfactant thermal barrier corrosion inhibitor coating for metal plates according to claim 1, characterized in that, The model of the planetary ball mill in step three is QM-SP.

7. The method for preparing a long-chain fatty acid surfactant-based thermal barrier corrosion inhibitor coating for metal plates according to claim 6, characterized in that, In step three, the rotational speed of the planetary ball mill is set to 300 r / min. -1 The process involves rotating clockwise for 30 minutes, then rotating counterclockwise for 30 minutes at the same speed.

8. The method for preparing a long-chain fatty acid surfactant thermal barrier corrosion inhibitor coating for metal plates according to claim 1, characterized in that, In step four, the amount of ammonia used is 0.5–2 mL / L, and the target pH value is adjusted to pH=6.

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