Huang Lizhen, Liu Jingwen, Wan Li, Li Bojie, Wang Xianwei, Kang Silin, Zhu Lei
School of Civil Engineering, Hubei Engineering Research Center for Cement-Based Ultra-High-Performance Concrete and Prefabricated Building Technology, Hubei Engineering Research Center for Key Technologies in Modern Paper and Sanitary Products Manufacturing, Hubei Engineering University, Xiaogan 432000, China.
School of Physics and Electronic Information Engineering, Ningxia Normal University, Guyuan 756099, China.
Materials (Basel). 2025 Jun 26;18(13):3031. doi: 10.3390/ma18133031.
This study synthesized two eco-friendly inhibitors-a chitosan-copper metal-organic framework (CS@Cu MOF) and chitosan-Schiff base-Cu complex (Schiff-CS@Cu)-for Q345 steel protection in 3.5% NaCl/1M HCl. Electrochemical and weight loss analyses demonstrated exceptional corrosion inhibition: untreated specimens showed a 25.889 g/(m·h) corrosion rate, while 100 mg/L of CS@Cu MOF and Schiff-CS@Cu reduced rates to 2.50 g/(m·h) (90.34% efficiency) and 1.67 g/(m·h) (93.56%), respectively. Schiff-CS@Cu's superiority stemmed from its pyridine-Cu chelation forming a dense coordination barrier that impeded Cl/H penetration, whereas CS@Cu MOF relied on physical adsorption and micro-galvanic interactions. Surface characterization revealed that Schiff-CS@Cu suppressed pitting nucleation through chemical coordination, contrasting with CS@Cu MOF's porous film delaying uniform corrosion. Both inhibitors achieved optimal performance at 100 mg/L concentration. This work establishes a molecular design strategy for green inhibitors, combining metal-organic coordination chemistry with biopolymer modification, offering practical solutions for marine infrastructure and acid-processing equipment protection.
本研究合成了两种环保型缓蚀剂——壳聚糖-铜金属有机框架（CS@Cu MOF）和壳聚糖-席夫碱-铜配合物（Schiff-CS@Cu），用于在3.5% NaCl/1M HCl溶液中对Q345钢进行防护。电化学分析和失重分析表明它们具有优异的缓蚀性能：未处理的试样腐蚀速率为25.889 g/(m·h)，而100 mg/L的CS@Cu MOF和Schiff-CS@Cu分别将腐蚀速率降至2.50 g/(m·h)（缓蚀效率90.34%）和1.67 g/(m·h)（缓蚀效率93.56%）。Schiff-CS@Cu的优势源于其吡啶-铜螯合作用形成了致密的配位屏障，阻碍了Cl/H的渗透，而CS@Cu MOF则依靠物理吸附和微电偶相互作用。表面表征显示，Schiff-CS@Cu通过化学配位抑制点蚀形核，这与CS@Cu MOF形成的多孔膜延缓均匀腐蚀形成对比。两种缓蚀剂在100 mg/L浓度下均达到最佳性能。这项工作建立了一种绿色缓蚀剂的分子设计策略，将金属有机配位化学与生物聚合物改性相结合，为海洋基础设施和酸处理设备的防护提供了切实可行的解决方案。
