pH值对镁合金表面氧化硅溶胶凝胶成膜及膜层性能的影响
Influence of pH on Performance of SiO2 Film Prepared by Sol-Gel
摘 要
采用溶胶-凝胶(Sol-Gel)浸渍提拉法在AZ91D镁合金表面制备不同pH值下的SiO2溶胶-凝胶膜层; 对膜层耐酸性、耐碱性、抗氧化性及耐蚀性等性能进行测试和表面形貌分析。结果表明, 当SiO2溶胶组分比(正硅酸乙酯∶无水乙醇∶蒸馏水的物质的量之比)为1∶15∶9.5, 浸渍时间为120 s, 浸渍次数为1, 干燥温度为120 ℃时, 调节溶胶的pH值为2.8, 可获得均匀、重复性好的SiO2溶胶凝胶膜, 该膜层具有良好的耐蚀性。
镁合金
SiO2溶胶
pH值
耐蚀性
sol-gel
magnesium alloy
SiO2 sol
pH value
corrosion resistance
Abstract
An anti-corrosion silicon dioxide coating on the surface of AZ91D was prepared by sol-gel method. Characteristics and the surface morphology of the SiO2 sol coatings were tested and analyzed. The results showed that an uniform, repeatable SiO2 sol-gel coating was obtained when the mass ratio of TEOS ∶ ethanol ∶ water was 1∶15∶9.5, soaking time was 120 s, dipped for once, drying temperature was 120 ℃, pH of SiO2 sol was 2.8. The coating had fairly good corrosion resistance and thus improved the corrosion resistance of the AZ91D alloy greatly.
中图分类号 TG178
所属栏目 应用技术
基金项目 广西教育厅科研项目(No.200911MS110)
收稿日期 2010/7/15
修改稿日期 2010/8/24
网络出版日期
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引用该论文: WEN Yu-qing,SHANG Wei,LI Xiao-xiao,JIANG Xiu-juan. Influence of pH on Performance of SiO2 Film Prepared by Sol-Gel[J]. Corrosion & Protection, 2011, 32(6): 477
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参考文献
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【2】Mathieu S, Rapin C, Hazan J, et al. Corrosion behavior of high pressure die-cast and semi-solid cast AZ91D alloys[J]. Corrosion Science, 2002, 44:27-37.
【3】Kwo Zong Chong, Teng Shih. Conversion-coating treatment for magnesium alloys by a permanganate-phosphate solution[J]. Mater Chem Phys, 2003(1):191-200.
【4】Yfantis A, Paloumpa I, Schmeier D, et al. Novel corrosion resistant films for Mg alloys[J]. Surface and Coatings Technology, 2002, 151-152(3):400-404.
【5】Umehara H, Takaya M, Terauch S. Chrome-free surface treatment for magnesium alloy[J]. Surface and Coatings Technology, 2003, 169-170(6):666-669.
【6】Phani A R, Gammel F J, Hack T. Structural mechanical and corrosion resistance properties of Al2O3-CeO2 nanocomposites in silica matrix on Mg alloys by a sol-gel dip coating technique[J]. Surface and Coatings Technology, 2006, 201(6):3299-3306.
【7】许越, 李英杰, 吕祖舜, 等. Sol-gel法制备耐蚀涂层的技术及应用[J]. 材料科学与工艺, 2005, 13(2):200-204.
【8】王秀华, 孙益民, 刘守华, 等. 有机-无机杂化涂层制备及耐腐蚀性能研究[J]. 腐蚀科学与防护技术, 2006, 18(4):292-294.
【9】蒋奎胜, 唐聿明, 赵旭辉, 等. 电流密度对AZ91D镁合金阳极氧化膜表面形貌及粘接性能的影响[J]. 材料研究学报, 2010, 24(3):305-310.
【10】时海芳, 李晓, 马壮, 等. MB2镁合金SiO2基陶瓷涂层的性能[J]. 腐蚀与防护, 2008, 29(8):457-459.
【11】郭志光, 周峰, 刘维民, 等. 溶胶凝胶法制备仿生超疏水性薄膜[J]. 化学学报, 2006, 64(8):761-766.
【12】罗小萍, 夏兰廷, 臧东勉. 镁合金表面化学转化处理研究现状[J]. 铸造设备研究, 2007(2):44-47.
【13】张军军, 李文芳, 杜军. 室温下铝合金表面Ce-Mn转化膜的制备及性能[J]. 金属学报, 2009, 45(12):1466-1472.
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