表面技术2017，Vol.46Issue(7)：13-19,7.DOI:10.16490/j.cnki.issn.1001-3660.2017.07.003
一种基于层层自组装的新型EPS防腐蚀复合涂层
A New EPS Anticorrosive Composite Coating Based on Layer-by-Layer Assembly
摘要
Abstract
The work aims to explore preparation method of EPS composite coating, and verify its anti-corrosion effect. Based upon electrostatic adsorption among nano-silica and poly (allylamine hydrochloride, PAH) and entrapping extracellular polymeric substances (EPS), a stable and uniform composite coating was prepared by introducing Layer-by-Layer (LbL) self-assembly technology. Stability and anti-corrosion effect of the coating were analyzed by means of Zeta potential, average grain diameter, corrosion weight loss experiment, electrochemical testing, X-ray diffractometer (XRD) and scanning electron microscope (SEM). Zeta potential, average grain diameter test of nano-silica solution, corrosion weight loss experiment and electrochemical experiment indicated that, the coating had the most efficient, stable and lasting anti-corrosion effect provided with mass percent of 1.5wt%, alcohol fraction of 30%, EPS solution concentration of 200 mg/L and layer number of n=7. Scan-ning electron microscope (SEM), XRD and electrochemical impedance spectroscopy (EIS) results showed that carbon steel coated with LbL multi-layer coating had more compact and orderly corrosion products (quantities of Fe3O4) after being exposed to corrosive conditions for 15 days, lowest corrosive electric current density and maximum impedance. Optimum parameters and preparation method of LbL-based EPS composite coating are obtained. Compared with the original carbon steel and EPS coating, the anti-corrosion effect of the multi-layer EPS coating coated with LbL is the best.关键词
胞外聚合物/纳米SiO2/层层自组装/复合防腐蚀涂层/EIS电化学测试Key words
extracellular polymeric substance (EPS)/nano-silica/layer-by-layer self-assembly/multi-layer anti-corrosive coating/electrochemical impedance spectroscopy (EIS)分类
矿业与冶金引用本文复制引用
许萍,高飞,翟羽佳,汪长征,张雅君,魏智刚,黄俊杰..一种基于层层自组装的新型EPS防腐蚀复合涂层[J].表面技术,2017,46(7):13-19,7.基金项目
国家自然科学基金(51578035) （51578035）
北京建筑大学基金项目(00331615008) （00331615008）
城市雨水系统与水环境省部共建教育部重点实验室项目(PXM2014014210000057)Supported by the National Natural Science Foundation of China (51578035), Doctoral Program Foundation of BUCEA (00331615008), Research Foundation of KLUSSWE-ME&BUCEA (PXM2014014210000057) （PXM2014014210000057）
