Inhibition effect of traditional corrosion inhibitors is significantly reduced under harsh marine environment. Hence developing corrosion inhibitors with strong adsorption to satisfy efficient corrosion protection for reinforced concrete in harsh marine environment is urgent. By using multiple adsorption sites and abundant internal pores in metal organic frameworks (MOFs), a novel highly efficient monofluorophosphate-loaded zeolitic imidazolate framework (MFP@ZIF-8) nano corrosion inhibitors are prepared by in-situ synthesis method in this study. The influence of MFP@ZIF-8 nano corrosion inhibitors on corrosion performance of reinforced mortar was extensively investigated. The corrosion initiation time of the reinforcement embedded in mortar is dramatically prolonged in the presence of MFP@ZIF-8 nano corrosion inhibitors. After corrosion initiation, FePO4 product layer forms and the contents of corrosion products with higher protective properties (FeOOH and Fe2O3) are also increased on the surface of the reinforcement embedded in mortar with MFP@ZIF-8 nano corrosion inhibitors. Meanwhile, the porosity and chloride concentration at the reinforcement/mortar interface is reduced by 10.7 % and 30.5 % in the presence of 0.8 wt% MFP@ZIF-8 nano corrosion inhibitors after 210 days immersion in 3.5 wt% NaCl solutions. As a result, the corrosion resistance of the embedded reinforcement is significantly enhanced by MFP@ZIF-8 nano corrosion inhibitors. Higher corrosion inhibition efficiency is related to larger dosage of MFP@ZIF-8 nano corrosion inhibitors. The inhibition efficiency is 87.8 % and 65.8 % in reinforced mortar in the presence of 0.8 wt% MFP@ZIF-8 nano corrosion inhibitors after 180 days and 210 days immersion.

中文翻译：

---

单氟磷酸盐负载 ZIF-8 金属有机框架纳米缓蚀剂在加筋砂浆中的抑制效果


传统缓蚀剂在恶劣的海洋环境下抑制作用显著降低。因此，开发具有强吸附力的缓蚀剂以满足恶劣海洋环境中钢筋混凝土的高效防腐需求是当务之急。利用金属有机框架 （MOFs） 中的多个吸附位点和丰富的内孔，本研究采用原位合成法制备了一种新型高效的单氟磷酸盐负载沸石咪唑酸盐框架 （MFP@ZIF-8） 纳米缓蚀剂。MFP@ZIF-8 纳米缓蚀剂对增强砂浆腐蚀性能的影响得到了广泛的研究。在 MFP@ZIF-8 纳米缓蚀剂存在下，嵌入砂浆中的增强材料的腐蚀起始时间显着延长。腐蚀开始后，FePO4 产物层形成，具有更高保护性能的腐蚀产物（FeOOH 和 Fe2O3）的含量在嵌入 MFP@ZIF-8 纳米缓蚀剂的砂浆增强体表面也增加。同时，在 0.8 wt% MFP@ZIF-8 纳米缓蚀剂存在下，在 3.5 wt% NaCl 溶液中浸泡 210 天后，增强/砂浆界面处的孔隙率和氯化物浓度分别降低了 10.7 % 和 30.5 %。因此，MFP@ZIF-8 纳米缓蚀剂显著提高了嵌入增强材料的耐腐蚀性。较高的缓蚀效率与 MFP@ZIF-8 纳米缓蚀剂的用量较大有关。在 0.8 wt% MFP@ZIF-8 纳米缓蚀剂存在下，浸泡 180 天和 210 天后，增强砂浆的抑制效率分别为 87.8 % 和 65.8 %。