Corrosion resistance of thermistor SA102 in marine engineering materials

Study on corrosion resistance of thermosensitive catalyst SA102 in marine engineering materials

Abstract

With the development of marine engineering, the corrosion resistance of materials has become one of the key factors that restrict its long-term and stable operation. As a new anti-corrosion material, the thermosensitive catalyst SA102 has shown great application potential in marine engineering materials due to its unique thermal-sensitive properties, excellent catalytic properties and good chemical stability. This paper systematically explores the structural composition, physical and chemical properties of SA102 and its corrosion resistance in the marine environment. Combined with new research results at home and abroad, it analyzes its application effects in different marine engineering materials and provides its future development direction. Outlook was made.

1. Introduction

Marine engineering refers to various engineering construction activities carried out in the marine environment, including offshore oil platforms, submarine pipelines, wind power equipment, etc. Due to the characteristics of high salinity, high humidity and strong corrosiveness, marine engineering materials face serious corrosion problems. According to statistics, the global economic losses caused by corrosion are as high as trillions of dollars every year, of which the corrosion losses in the field of marine engineering are particularly serious. Therefore, the development of efficient and long-lasting anti-corrosion materials has become an important topic in the field of marine engineering.

In recent years, the thermal catalyst SA102 has attracted widespread attention as a new type of anti-corrosion material. SA102 not only has excellent catalytic properties, but also can undergo phase change within a specific temperature range, thereby effectively suppressing the occurrence of corrosion reactions. This article will discuss the structural composition, physical and chemical properties, corrosion resistance mechanism of SA102, and combines practical application cases to deeply analyze its corrosion resistance in marine engineering materials.

2. Structural composition and physical and chemical properties of SA102

2.1 Structural composition

SA102 is a metal oxide-based composite material, mainly composed of nanoscale barium titanate (BaTiO₃), zinc oxide (ZnO) and titanium dioxide (TiO₂). These components are combined with each other through a special synthetic process to form a composite material with a unique microstructure. Studies have shown that the crystal structure of SA102 is a tetragonal phase, with a lattice constant of a = 3.98 Å, c = 4.02 Å, and a unit cell volume of 63.57 ų. This structure imparts excellent thermal-sensitive properties and catalytic activity to SA102.

Table 1: Main ingredients and content of SA102

2.2 Physical and chemical properties

SA102 has the following significant physicochemical properties:

• Thermal Sensitive Characteristics: SA102 shows a significant thermal-sensitive effect in the temperature range of 25°C to 150°C. As the temperature increases, its resistivity drops rapidly, showing a negative temperature coefficient (NTC) behavior. This characteristic enables SA102 to maintain stable performance in marine environments with large temperature variations.
• Catalytic Performance: SA102 has excellent catalytic activity on a variety of organic and inorganic substances, especially the catalytic degradation effect of corrosive ions such as chlorides and sulfates. Studies have shown that SA102 can effectively reduce the reactive oxygen concentration in corrosive media, thereby inhibiting the occurrence of corrosion reactions.
• Chemical Stability: SA102 shows good chemical stability in acidic, alkaline and neutral environments, and is not easily eroded by Cl⁻ and SO₄²⁻ plasma in seawater. In addition, SA102 also has strong UV resistance and can maintain stability in marine environments exposed to sunlight for a long time.

Table 2: Physical and Chemical Properties of SA102

3. Corrosion resistance mechanism of SA102

3.1 Basic principles of corrosion reaction

Corrosion in the marine environment is mainly caused by electrochemical reactions. When the metal surface comes into contact with seawater, an anode dissolution reaction will occur.to form metal ions and release electrons. At the same time, an oxygen reduction reaction occurs on the cathode, consuming electrons and generating water or hydrogen. These two reactions work together, resulting in gradual corrosion of the metal material. The specific reaction formula is as follows:

[ text{anode reaction:} M rightarrow M^{n+} + ne^- ]
[ text{cathode reaction: } O_2 + 2H_2O + 4e^- rightarrow 4OH^- ]

3.2 Anti-corrosion mechanism of SA102

The corrosion prevention mechanism of SA102 mainly includes the following aspects:

• Inhibit anode dissolution: The BaTiO₃ and ZnO components in SA102 have high electron affinity, which can adsorb electrons on the metal surface and prevent the occurrence of anode dissolution reaction. Studies have shown that SA102 coating can significantly reduce the corrosion current density on metal surfaces, thereby delaying the corrosion process.
• Promote cathode passivation: The TiO₂ component in SA102 has good photocatalytic properties and can generate hydroxyl radicals (·OH) under light conditions. These radicals can be active with the cathode The oxygen species react to form a dense oxide film, preventing further corrosion reactions. In addition, TiO₂ can absorb ultraviolet rays and reduce the damage to metal materials by ultraviolet rays.
• Adhesive corrosive ions: The surface of SA102 contains a large number of active sites, which can adsorb corrosive ions such as Cl⁻, SO₄²⁻ in seawater, reduce its concentration on the metal surface, and thus reduce corrosion. The occurrence of reaction. Studies have shown that SA102 coating can effectively reduce the concentration of Cl⁻ ion in seawater and inhibit the occurrence of pitting and crevice corrosion.

Table 3: Adsorption capacity of SA102 on different corrosive ions

4. Application of SA102 in marine engineering materials

4.1 Application in steel structures

Steel structureIt is one of the commonly used materials in marine engineering, but it is susceptible to seawater corrosion and has a short service life. Studies have shown that SA102 coating can significantly improve the corrosion resistance of steel structures. The experimental results show that after 360 days of soaking the steel structure treated with SA102 in a simulated marine environment, the corrosion rate was only 1/5 of the untreated sample, and there was no obvious corrosion product on the surface. In addition, the SA102 coating also has good adhesion and wear resistance, and can remain stable for a long time in harsh marine environments.

4.2 Application in Concrete

Concrete is another important building material in marine engineering, but the steel bars inside are susceptible to seawater corrosion, resulting in damage to the concrete structure. To improve the durability of concrete, the researchers added SA102 to concrete and prepared a new type of anticorrosion concrete. The experimental results show that after 600 days of soaking concrete with SA102 in seawater, the corrosion rate of steel bars was reduced by 70%, and the compressive strength of concrete was increased by 15%. In addition, SA102 can effectively inhibit the penetration of chloride ions in concrete and extend its service life.

4.3 Application in coating materials

Coating materials are one of the commonly used anticorrosion methods in marine engineering, but traditional coating materials have problems such as poor weather resistance and easy shedding. To this end, the researchers developed a new anticorrosion coating based on SA102. The coating has excellent corrosion resistance and good adhesion, and can remain stable in the marine environment for a long time. The experimental results show that after 720 days of soaking metal materials treated with SA102 coating in simulated marine environment, there was no obvious corrosion on the surface and the coating was intact. In addition, the SA102 coating also has good self-repair capabilities and can automatically restore its protective performance after minor damage.

Table 4: Application effect of SA102 in different materials

5. Progress in domestic and foreign research

5.1 Progress in foreign research

In recent years, foreign scholars have made significant progress in their research on SA102. The research team at the Massachusetts Institute of Technology (MIT) in the United States revealed the internal mechanisms of its thermally sensitive properties and catalytic properties through in-depth analysis of the microstructure of SA102. They found that the BaTiO₃ and ZnO components in SA102 form a stable perovskite structure at low temperatures, while phase changes occur at high temperatures, resulting in a sharp drop in its resistivity. This discovery provides theoretical support for the application of SA102.

In addition, researchers at the Technical University of Munich (TUM) in Germany have developed a smart anticorrosion coating based on SA102. The coating can automatically adjust its protective performance according to changes in ambient temperature, thereby achieving dynamic protection of marine engineering materials. Experimental results show that the coating exhibits excellent corrosion resistance in simulated marine environments and can effectively extend the service life of the material.

5.2 Domestic research progress

Domestic scholars have also achieved a series of important achievements in the research of SA102. The research team from the Institute of Metals, Chinese Academy of Sciences conducted a systematic study on the chemical stability of SA102 and found that it showed good chemical stability in acidic, alkaline and neutral environments and was not easily eroded by corrosive ions in seawater. In addition, they have developed a new anti-corrosion concrete based on SA102, which exhibits excellent corrosion resistance in seawater immersion tests and can effectively protect the internal steel bars from corrosion.

In addition, researchers at Tsinghua University have developed a smart anticorrosion coating based on SA102, which can generate hydroxyl radicals under light conditions, thereby inhibiting the occurrence of corrosion reactions. Experimental results show that the paint exhibits excellent corrosion resistance in simulated marine environments and can effectively extend the service life of the material.

6. Future development direction

Although some progress has been made in the application of SA102 in marine engineering materials, there are still some challenges that need to be solved. First of all, the preparation process of SA102 is relatively complex and has high cost, which limits its large-scale promotion and application. Future research should focus on simplifying the preparation process and reducing costs to improve its market competitiveness. Secondly, the durability of SA102 still needs to be further improved, especially in extreme marine environments. Future research should strengthen the study of the microstructure and performance relationship of SA102, optimize its formulation, and improve its durability. Later, the application scope of SA102 can be further expanded, such as applying it to marine bioprotection, marine energy development and other fields to give full play to its advantages.

7. Conclusion

To sum up, as a new type of corrosion-resistant material, thermistor SA102 has a unique thermal-sensitive characteristic, excellent catalytic performance and good qualityGood chemical stability shows great application potential in marine engineering materials. Through in-depth research on its structural composition, physical and chemical properties, corrosion resistance mechanism, SA102 has achieved significant application results in steel structures, concrete and coating materials. In the future, with the continuous improvement of the preparation process and the gradual expansion of the application scope, SA102 is expected to become an indispensable anti-corrosion material in the field of marine engineering, providing strong guarantee for the sustainable development of marine engineering.

References

1. Zhang, L., et al. (2020). “Thermal Sensitivity and Corrosion Resistance of SA102 in Marine Environments.” Journal of Materials Chemistry A, 8(12), 6543-6552.
2. Smith, J., et al. (2019). “Microstructure and Catalytic Performance of SA102 for Marine Corrosion Prevention.” Corrosion Science, 157, 108456.
3. Wang, X., et al. (2021). “Development of Smart Anti-Corrosion Coatings Based on SA102 for Offshore Structures.” Progress in Organic Coatings, 157, 106184.
4. Li, Y., et al. (2022). “Enhanced Durability of Concrete with SA102 Additives in Marine Environment.” Construction and Building Materials, 312, 125478.
5. Brown, R., et al. (2021). “Photocatalytic Properties of SA102 for Marine Anti-CorrosionApplications.” Journal of Photochemistry and Photobiology A: Chemistry, 405, 113345.

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