Al_2O_3纳米粒子环氧涂层对钢筋防护性能的电化学噪声分析  

Electrochemical Noise Analysis for Evaluating the Protection Properties of Al_2O_3 Nanoparticles Epoxy Coating for Steel Bar

作　　者：张哲[1,2] 严刚[2] 倪福松 贾明子[2] 

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《表面技术》2014年第2期18-23,54,共7页Surface Technology

基　　金：广西自然科学基金(2013GXNSFBA019248);广西建筑工程检测与试验重点实验室开放基金(12-KF-03)~~

摘　　要：目的研究Al2O3纳米粒子环氧复合涂层对钢筋的防护性能。方法制备Al2O3纳米粒子,将其添加至环氧涂料中,并涂覆在工业钢筋表面成膜。通过XRD和SEM对Al2O3进行表征;利用电化学噪声、交流阻抗谱分析技术,对复合涂层在3.5%(质量分数)NaCl介质中对工业钢筋的防护性能进行测试分析。结果制备的氧化铝纳米粒子的粒径平均为75 nm。通过对电化学噪声测试的有效数据进行时域和频域分析,通过交流阻抗谱分析及数据拟合,认为Al2O3纳米粒子添加量为0.1%(以占环氧树脂质量的百分比计)时,涂层对钢筋的防护性能最好。结论向环氧涂层中添加适量的Al2O3纳米粒子,可以明显提升其对钢筋的防护性能。Objective To study the protective performance of Al2O3 nanoparticles epoxy composite coating of steel. Methods The Al2 03 nanopartieles were prepared, and then added into the epoxy coating, coated on the steel as a film. The Al2O3 nanoparticles were characterized by XRD and SEM. The anti-corrosive properties of the composite coatings in the solution of 3.5 % NaCI were evaluated by electrochemical noise and electrochemical impedance spectroscopy. Results The average size of Al2O3 nanoparticles was 75 nm. Based on the time and frequency domains analysis of electrochemical noise data, the analysis of electrochemical impedance spectroscopy and data fitting, it was found that the composite coating with 0.1% Al2O3 nanoparticles （ as a percentage in the weight of epoxy resin） had the best protective performance on steel. Conclusion The epoxy coating supplemented with a suitable amount of Al2O3 nanoparticles showed significantly improved protective performance on steel.

关 键 词：Al2O3纳米粒子 环氧涂层 钢筋 电化学噪声 交流阻抗谱 

分 类 号：TG174.461[金属学及工艺—金属表面处理]