Ag@SiO_2纳米复合涂层在大肠杆菌作用下的电化学阻抗谱研究  

Electrochemical impedance spectroscopic studies of the effect of Ag@SiO_2 nanocomposites on the corrosion of epoxy coatings influenced in the presence of Escherichia coli

作　　者：张新生[1] 王洁欣[1] 乐园[1] 陈建峰[1] 

机构地区：[1]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2011年第5期35-39,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(20821004);国家"863"计划(2009AA033301)

摘　　要：研究了添加不同含量Ag@SiO2纳米材料的环氧树脂涂层在大肠杆菌溶液中浸泡前和浸泡110h后的电化学阻抗谱特征,分别提出了其等效电路模型,并比较了浸泡前和浸泡850 h后的涂层形貌变化。结果表明,浸泡后未添加Ag@SiO2的涂层的阻抗降低了96%,添加0.3%的Ag@SiO2涂层的阻抗也下降了73%,且两者都出现了明显的锈斑;而添加0.1%的Ag@SiO2涂层的阻抗和形貌在浸泡前后基本保持不变。可见,添加适量的Ag@SiO2可以显著提高涂层的耐微生物腐蚀性能。Electrochemical impedance spectra （EIS） of epoxy coatings pigmented with Ag@ SiO2 nanoparticles at different concentrations were recorded before and after immersion for 110 h in Escherichia coli （E. coli） solution. Corresponding equivalent circuits for the coatings were proposed, and their surface topography before and after im- mersion for 850 h in E. coli solution was compared. The results showed that after immersion, the resistance of coat- ings with zero and 0. 3% mass ratio of Ag@SiO2 pigment to resin decreased by 96% and 73% , respectively. Obvious corrosion spots were found on the surfaces of both coatings. However, there was little change in either resistance or topography of the coating containing 0. 1% Ag@SiO2. This shows that the addition of an appropriate a- mount of Ag@ SiO2 can increase the microbiological corrosion resistance of coatings.

关 键 词：纳米复合涂层 大肠杆菌 耐腐蚀性 电化学阻抗谱 

分 类 号：TQ630.4[化学工程—精细化工]