Boron elements improve the corrosion resistance of organic polysilazanes mainly through the following mechanisms:
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Enhancing the stability of the molecular structure: Boron atoms can form special chemical bonds with silicon, nitrogen and other atoms in organic polysilazanes. For example, boron and nitrogen can form boron-nitrogen bonds (B-N) with relatively high bond energy. The formation of these chemical bonds changes the electron cloud distribution of the molecule, making the molecular structure more stable. When the material is eroded by corrosive substances, these stable chemical bonds can resist chemical reactions, reducing the breakage and degradation of molecular chains, thus improving the corrosion resistance of the material.
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Increasing the degree of cross-linking: Boron elements can promote the cross-linking reaction between organic polysilazane molecules. During the polymerization process, boron atoms act as cross-linking centers and react with multiple organic polysilazane molecular chains to form a three-dimensional network structure. As the degree of cross-linking increases, the density of the material increases, and the movement of molecular chains is restricted, making it difficult for corrosive substances to diffuse and penetrate inside the material. At the same time, the cross-linked structure can withstand greater external forces and chemical effects and is not easily damaged, thereby enhancing the corrosion resistance of the material.
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Forming a surface protective film: On the surface of the material, boron elements can react with oxygen in the air or other substances to form a dense protective film of boron oxide (B₂O₃) or other boron-containing compounds. This protective film has good chemical stability and barrier properties, which can prevent corrosive media such as water, acids, and alkalis from directly contacting the material matrix, reducing the occurrence probability of corrosion reactions. In addition, the protective film can also repair the tiny defects on the material surface, further improving the corrosion resistance of the material.
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