Study on Thermal Stability and Corrosion Resistance of Microencapsulated Corrosion Inhibitors for Reinforcement Steel
The use of corrosion inhibitors is an effective way to stop the corrosion of reinforced concrete structures.The microencapsulation of corrosion inhibitors overcomes the shortcomings of the traditional corrosion inhibitors,such as easy loss,high toxicity and low corrosion-inhibiting efficiency,improves the stability of corrosion inhibitors in concrete,and delays their release.It also significantly improves the durability of reinforced concrete.In this paper,double-layered microcapsules with the co-responsive effect of chloride and hydroxide ions were prepared by solvent evaporation and spray drying method.The morphology,physical phase,thermal stability,and corrosion-inhibiting properties of the microcapsules were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),thermogravimetric analysis(TGA)and electrochemical tests.The results show that the prepared single-layered microcapsules and double-layered microcapsules have good morphology,ideal core-shell structure,and good thermal stability,with 53.2％and 38.6％of core material content respectively.Through the electrochemical test of simulated concrete pore solution,the single-layered microcapsules released all the core material within 24 hours,and the double-layered microcapsules extended the time to 80 days with a better corrosion-inhibiting effect.
microcapsulecorrosion inhibitors for reinforcement steeldouble-layer structuredynamic potential
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