生物法改性纤维素纳米纤维制备高效CO_(2)缓蚀剂

Cellulose Nanofibers as an Effective CO_(2) Corrosion Inhibitor after Modification with Biotreatment

目的以绿色天然材料为原料,制备高效CO_(2)缓蚀剂。方法以植物乳杆菌为改性工具,采用生物法对纤维素纳米纤维进行改性,制备功能化的纳米材料。采用红外光谱对产物结构进行表征,使用失重测试和电化学测试相结合对碳钢在饱和CO_(2)盐溶液中的缓蚀性能进行评价。结果功能化的纤维素纳米纤维对碳钢的腐蚀具有明显的抑制作用。失重测试证实,当添加浓度达到10−4时,缓蚀效率可达到88.6%。极化曲线测试表明,改性后纳米缓蚀剂的作用机制属于混合抑制型,对阴极电荷的传递过程和阳极溶解过程均产生抑制作用,且纳米粒子在高过电位下会发生脱附。不同时间的电化学阻抗谱测试表明,纳米缓蚀剂的缓蚀作用在溶液中达到稳定的时间约8 h,明显长于传统的缓蚀剂。结论功能化的纤维素纳米纤维是一种缓蚀性能优异的新型纳米缓蚀剂,它独特的组成结构使其能在金属表面吸附成膜。这种特殊的改性方法为缓蚀剂的绿色安全生产提供了新的思路。

The work aims to develop an effective CO_(2)corrosion inhibitor with the novel biological method from green natural materials.The Lactobacillus plantarum is used as a modification tool,and cellulose nanofibers were modified by biological method to prepare functional nanomaterials.The structure of the product is characterized by infrared spectroscopy,and the corrosion inhibition performance of carbon steel in CO_(2)-saturated salt solution is evaluated by weight loss test and electrochemical measurements.The functionalized cellulose nanofibers(FCNFs)can inhibit the corrosion of carbon steel effectively,and the inhibition efficiency can reach 88.6%when the addition concentration reaches 10^(−4) in weight loss tests.In addition,the results in potentiodynamic polarization show that the FCNFs have mixed inhibition mechanism,which can inhibit both the charge transfer process in cathode and the anodic dissolution process,and the nano particles will desorb at high overpotential.Electrochemical impedance spectroscopy tests at different immersion time shows that the fluctuation time before the inhibition performance of FCNFs achieves stability in solution is about 8 hours,which is obviously longer than that of traditional inhibitors.The functionalized cellulose nanofiber is a new type of nano-inhibitor with excellent inhibition performance,and the unique structure enables nanoparticles to adsorb on metal surface.The special modification method provides a new idea for the green and safe production of corrosion inhibitor.