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Corrosion prevention principle of silicone-based anticorrosion coating
2025-07-21
The corrosion protection principle of organosilicon anticorrosion coatings is mainly based on their chemical stability and physical protection mechanism, achieving substrate protection through multiple mechanisms:
Electrochemical protection
The epoxy resin and ultrafine zinc powder in the coating form a composite protective layer. When the corrosive medium contacts the coating, the zinc powder will preferentially react with the corrosive medium (electrochemical corrosion), thus sacrificing itself to protect the substrate from corrosion.
Physical barrier
The organosilicon resin forms a dense network structure, effectively isolating moisture, oxygen, and other corrosive factors from the substrate. Its high bond energy (459 kJ/mol) of the silicon-oxygen bond (Si-O) gives the coating excellent weather resistance, allowing it to remain stable in harsh environments.
Adhesion enhancement
The coating, through the strong adhesion of the epoxy resin and substrate pretreatment (such as sandblasting to Sa2.5 cleanliness), ensures a firm bond between the coating and the metal surface, preventing delamination.
High-temperature resistance
Some organosilicon formulations can withstand high temperatures of 250-800℃ (such as high-temperature component protection for aircraft), forming a stable structure through condensation reaction or peroxide-catalyzed crosslinking.
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