tailieunhanh - Synthesis, characterization and corrosion inhibitive ability of composites silica – polypyrrole

The results shows that the SiO2/PPy in PVB coating has corrosion inhibitive ability for carbon steel, it can shift the potential of steel into anode areas and reduce the corrosion current density more than 100 times. | Vietnam Journal of Chemistry, International Edition, 55(6): 781-786, 2017 DOI: Synthesis, characterization and corrosion inhibitive ability of composites silica – polypyrrole Vu Thi Hai Van1,3, Pham Thi Nam1, Nguyen Thi Thom1, Nguyen Thu Phuong1, To Thi Xuan Hang1, Dinh Thi Mai Thanh2,3* 1 Institute for Tropical Technology, Vietnam Academy of Science and Technology (VAST) 2 University of Science and Technology of Hanoi, VAST 3 Graduate University of Science and Technology, VAST Received 22 March 2017; Accepted for publication 25 December 2017 Abstract Composites silica/polypyrrole (SiO2/PPy) were synthesized by in-situ, using FeCl3 as oxidant, the quantity of silica is varied from g, g, g to g (SP1, SP2, SP3 and SP4, respectively). The morphologies and characterizations of composites were evaluated by FT-IR, EDX, SEM, TEM and TGA. EDX result indicated that the percentage of silicon increase from to % when the quantities of silica in initial mixture increase. Carbon steel were coated with polyninylbutyral (PVB) resin and PVB coatings containing 10 % SP1, SP2, SP3 and SP4 by spin coating technique. Corrosion protection performance of PVB coating containing SiO2/PPy was evaluated by measurement of OCP and potentiodynamic polarization. The results shows that the SiO2/PPy in PVB coating has corrosion inhibitive ability for carbon steel, it can shift the potential of steel into anode areas and reduce the corrosion current density more than 100 times. Keywords. Composite silica-polypyrrrole, corrosion inhibitive ability, corrosion performance. 1. INTRODUCTION Corrosion of metals is an enormous problem throughout the world. The bad performance and environmental toxicity of conventional coatings persuade scientists to find a proper replacement coating to combat corrosion [1, 2]. Several techniques have been used to protect metals from corrosion. Polymer coatings maybe are the most widely used technique [3,