物理化学学报2022，Vol.38Issue(4)：8-17,10.DOI:10.3866/PKU.WHXB202003033
基于癸二酸二异辛酯的环保型复合缓蚀剂对钢筋的缓蚀效应
Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel
摘要
Abstract
Corrosion protection of reinforcing steel in concrete is an urgent task in modern society.Use of corrosion inhibitors in concrete is an effective,simple,and economical method for protecting reinforcing steel from corrosion.Mixed corrosion inhibitors usually perform better than a single inhibitor in actual reinforced concrete systems because of their synergistic inhibition effects.In recent years,environmentally friendly corrosion inhibitors have attracted increasing attention from corrosion researchers.Diisooctyl sebacate and sodium D-gluconate are environmentally friendly organic corrosion inhibitors,and ZnSC4 is an inorganic cathodic inhibitor,they may form an innovative,nontoxic,and pollution-free mixed corrosion inhibitor to control reinforcing steel corrosion.Additionally,diisooctyl sebacate and sodium D-gluconate serve as absorption-type inhibitors,and ZnSO4 acts as a precipitation-type inhibitor.We hypothesized that their combination might show a good synergistic corrosion inhibition effect on reinforcing steel.In this study,we developed a diisooctyl sebacate-based mixed corrosion inhibitor that includes D-gluconate and ZnSO4 and investigated its synergistic inhibition effects on reinforcing steel(Q235 steel)corrosion in a simulated polluted concrete pore solution.The reinforcing steel corrosion behavior and the properties of the mixed corrosion inhibitor were studied by polarization curve measurements,electrochemical impedance spectroscopy tests,and surface analysis methods(scanning electron microscopy,X-ray photoelectron spectroscopy,and Raman spectroscopy).The results indicated that the reinforcing steel in the simulated polluted concrete pore solution(pH 11.00,0.5 mol·L-1 NaCl)was in an active dissolving state and that localized corrosion took place.The mixed corrosion inhibitor,consisting of diisooctyl sebacate(59 mmol·L-1),sodium D-gluconate(0.5 mmol·L-1),and ZnSO4(1.5 mmol·L-1),had an obvious and powerful inhibition effect.Its inhibition efficiency reached 96.8％and 90.0％in the simulated polluted concrete pore solution and the cement mortar,respectively.The mixture of diisooctyl sebacate with sodium D-gluconate and ZnSO4 acted as a mixed-type inhibitor and effectively controlled both anodic and cathodic reactions of the steel corrosion.关键词
钢筋/氯化物/局部腐蚀/缓蚀剂/模拟混凝土孔隙液Key words
Reinforcing steel/Chloride/Localized corrosion/Corrosion inhibitor/Simulated concrete pore solution分类
化学化工引用本文复制引用
郭亚,金飘,邵敏华,董士刚,杜荣归,林昌健..基于癸二酸二异辛酯的环保型复合缓蚀剂对钢筋的缓蚀效应[J].物理化学学报,2022,38(4):8-17,10.基金项目
The project was supported by the National Natural Science Foundation of China(51731008,21573182,21073151,21203158).国家自然科学基金(51731008,21573182,21073151,21203158)资助项目 （51731008,21573182,21073151,21203158）
