The application of polysilazane in the field of chemical corrosion protection is mainly reflected in the high temperature resistant anticorrosion coating, and it has become a leader in this field with its excellent performance. The following is a detailed description of the application of polysilazane in the field of chemical corrosion protection:
1. Characteristics of polysilazane
Polysilazane (PSZ) is a polymer with Si-N bond as the main chain, with unique molecular structure characteristics. It can be divided into three categories: cyclic, oligomeric and polymeric. According to the difference in functional groups, it can also be divided into inorganic type (perhydropolysilazane) and organic type (containing methyl, vinyl, fluorinated and other modified varieties). Polysilazane combines the chemical and oxidative stability, high temperature resistance, corrosion resistance and hydrophobicity of silicon, and has the chemical inertness and hydrophobicity of nitrogen, showing excellent thermal stability, mechanical and chemical stability.
High temperature resistance: Polysilazane has excellent temperature resistance. The long-term working temperature of oligomer resin can reach above 400℃, while polymer resin can continue to work in high temperature environment of 600℃ to 1000℃, and even in some application scenarios, its high temperature resistance can reach above 1800℃.
Mechanical properties: Polysilazane has excellent pencil hardness and substrate adhesion. The film thickness is only about 10 microns, but it can resist flame erosion and thermal shock.
Chemical stability: Polysilazane has excellent antioxidant, anti-corrosion, insulation, flame retardant, heat insulation, wear resistance and hydrophobic properties.
2. Application of polysilazane in high temperature resistant anti-corrosion coating
High temperature resistant anti-corrosion coating is a special coating that provides long-term corrosion protection for substrates such as metal materials under high temperature environment. Polysilazane has become an ideal material for preparing such coating due to its excellent performance.
Coating composition: High temperature resistant anti-corrosion coating is mainly composed of fillers such as high temperature resistant polymers, hybrid resins or special ceramics. As a kind of high-temperature resistant polymer, polysilazane can withstand high-temperature corrosion of about 600℃ to 1200℃.
Mechanism of action: The OH active groups in polysilazane coatings can react rapidly with the active components in the filler and the polar groups on the active surface of steel to form a polymer with a three-dimensional cross-linked structure. This polymer not only gives the material and coating excellent mechanical properties, but also enhances the bonding force with the substrate, so that the coating is closely combined with the steel substrate, and together constitutes a high-temperature resistant anti-corrosion coating with dual functions of electrochemical protection and physical shielding.
Application scenarios: Polysilazane high-temperature resistant anti-corrosion coatings are widely used in aerospace, semiconductor electronics, photovoltaic cells, high-temperature resistant anti-corrosion industrial coatings, adhesives, resin-based composite materials and other fields. In the fields of military and civilian dual-use automobiles and trucks, polysilazane is also often used as a key anti-corrosion material for engines, exhaust pipes, pistons, heat exchangers and high-temperature sealing, industrial high-temperature furnaces, fireproof and heat-insulating materials, etc.
3. Advantages of polysilazane coatings
High-temperature stability: Polysilazane coatings can maintain stable performance in extremely high temperature environments, effectively preventing corrosion and deterioration of substrates.
Strong adhesion: Polysilazane can form a tight covalent bond with the substrate to ensure the strong adhesion of the coating.
Excellent durability: After rigorous testing, the polysilazane coating can remain intact under harsh conditions such as long-term high temperature, rapid cooling and heating, without blistering or shedding.
In summary, the application of polysilazane in the field of chemical corrosion protection has significant advantages and broad prospects. With the advancement of science and technology and the development of industry, the application of polysilazane in high temperature resistant anti-corrosion coatings will be more extensive and in-depth.