纳米SiO_2杂化涂层对铝合金耐腐蚀性能的影响  

Effect of Nano-SiO_2 Hybrid Coatings on Corrosion Resistance of Aluminum Alloys

作　　者：李恒[1] 李澄[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《涂料工业》2010年第9期25-28,33,共5页Paint & Coatings Industry

摘　　要：为了改善铝合金材料的耐腐蚀性能,本研究用正硅酸乙酯(TEOS)为主要原料,加入一定量的去离子水、KH-550和纳米SiO2,以冰乙酸为催化剂制备溶胶。通过浸渍-提拉法和相应的处理在铝合金基体表面形成杂化涂层,通过电化学测试和扫描电镜(SEM)观察,结果表明:添加纳米SiO2制备的涂层有效地提高了铝合金在3.5%NaCl溶液中的防腐性能,使铝合金基体的耐腐蚀性能和稳定性得到大幅度的提高。涂层中的纳米SiO2含量和热处理温度对涂覆铝合金的耐蚀性能有不同影响,当纳米SiO2含量为0.1%、热处理温度为130℃时,制备的杂化涂层性能最佳,在3.5%NaCl溶液中的腐蚀电流密度约为3.613×10-7A/cm2,这一数值相对于铝合金基体的腐蚀电流密度4.208×10-5A/cm2降低了2个数量级,显示出涂层对铝合金基体具有较好的防护效果。To improve the corrosion resistance of aluminum alloy, a kind of sol- gel coatings was prepared from TEOS as the main component in addition to H2O, KH -550 ,and Nano- SiO2 particles. HAc was used as catalyst for sol - gel process. Dip - coating techniques was applied to form a hybrid coatings on Alalloy substrate. Electrochemical techniques and Scanning Electron Microscopy （SEM） were used to characterize the characteristics of hybrid coatings. The results showed that the Nano - SiO2 - containing hybrid coatings can improve the corrosion resistance of aluminum alloys in 3.5% NaCl effectively, and provide effective protection for aluminum alloy substrates and greatly improve their stability. When 0. 1% of Nano - SiO2 was addied and heat treatement temperature was 130 ℃, the corrosion current density of the sample was estimated 3. 613 10^-7 A/cm^2in 3.5% NaCl solution,which was two orders of magnitude lower compared with the corro- sion current density of bared aluminium alloys. This indicated a good protection for aluminium alloys by hybrid coatings.

关 键 词：纳米氧化硅 溶胶-凝胶 耐腐蚀性 杂化涂层 

分 类 号：TQ630.7[化学工程—精细化工]