The aging of materials in marine environments is a typical multi factor collaborative degradation process, where seawater corrosion and oxidative aging exacerbate each other. The new generation of ocean engineering antioxidants integrates multiple functions through molecular design: hydrophobic long chains resist saltwater penetration, metal chelating groups inhibit electrochemical corrosion, and free radical capture units provide antioxidant protection. On site testing shows that the protective life of marine platform coatings containing such multifunctional antioxidants in the high temperature and high salt environment of the South China Sea has been extended from 3 years to over 8 years.
The challenge of chlorine oxidation resistance for seawater desalination membrane materials is particularly severe. Reverse osmosis membranes are prone to oxidation and performance degradation in chlorine containing water treatment. Researchers embed antioxidant nanoparticles (such as ceria) into polyamide active layers to form a "sacrificial protection" mechanism. Nanoparticles preferentially react with hypochlorous acid to protect the polymer matrix from attack. Industrial tests have shown that this protective technology extends the service life of reverse osmosis membranes by three times under residual chlorine conditions of 0.5 ppm, significantly reducing the frequency of membrane replacement in seawater desalination plants.
The antioxidant requirements of deep-sea exploration equipment are extremely special. In high-pressure, low-temperature, and low oxygen deep-sea environments, the oxidation mechanism of materials is completely different from atmospheric pressure. Antioxidants for deep-sea development adopt rigid molecular structures to prevent configuration changes and failure under high pressure; Simultaneously introducing pressure responsive functional groups enhances antioxidant activity under high pressure. According to the testing data of the Mariana Trench, the sealing material of deep-sea robots containing special antioxidants still maintains mechanical properties of over 90% after continuous operation for 500 hours at 1100 atmospheres, far exceeding the performance of traditional materials.
