过去,对AZ91D压铸镁合金表面硅烷化的报道较少.以耐点蚀性能为指标,采用正交试验法优选了AZ91D压铸镁合金表面制备γ-氨丙基三乙氧基硅烷(KH-500)膜的主要工艺参数,包括硅烷体积分数、乙醇与去离子水体积比、水解时间、溶液pH值和浸涂时间等；通过盐水全浸试验考察了优化工艺条件下所得硅烷膜的耐蚀性能,利用扫描电镜(SEM)和能谱仪(EDS)分析其表面形貌和组成.结果表明:影响AZ91D压铸镁合金表面KH-550硅烷成膜因素的主次顺序为溶液pH值＞水解时间＞乙醇与去离子水体积比＞硅烷体系分数＞浸涂时间；最佳成膜工艺条件为硅烷体积分数为5％,乙醇与去离子水体积比为85:15,水解时间为2h,pH值为9,浸涂时间90 s；以最佳工艺制备的KH-550硅烷膜自然干燥后不太均匀,膜主要由C,N,O,Mg,A1,Si等元素组成,其防护能力略优于常规低铬钝化膜,可显著改善镁合金基体的耐蚀性能.
参考文献
| [1] | 陈言坤,鲁彦玲,杜仕国.镁合金表面植酸转化膜的研究进展[J].材料保护,2010(10):50-52. |
| [2] | 杨晓冰,郭瑞光,兰力强.国内外镁合金无铬转化技术研究规模及进展[J].材料保护,2011(09):48-50,68. |
| [3] | V. Subramanian;W. J. Van Ooij .Effect of the amine functional group on corrosion rate of iron coated with films of organofunctional silanes[J].Corrosion: The Journal of Science and Engineering,1998(3):204-215. |
| [4] | T. Van Schaftinghen;C. Le Pen;H. Terryn;F. Horzenberger .Investigation of the barrier properties of silanes on cold rolled steel[J].Electrochimica Acta,2004(17/18):2997-3004. |
| [5] | 郑勇,谭澄宇,贺甜,唐娟.乙烯基硅烷处理的Q235钢在3．5％NaCl中腐蚀性的阻抗谱分析[J].材料保护,2012(06):46-50. |
| [6] | Zand, BN;Mahdavian, M .Corrosion and adhesion study of polyurethane coating on silane pretreated aluminum[J].Surface & Coatings Technology,2009(12):1677-1681. |
| [7] | Seth A;van Ooij WJ;Puomi P;Yin Z;Ashirgade A;Bafna S;Shivane C .Novel, one-step, chromate-free coatings containing anticorrosion pigments for metals - An overview and mechanistic study[J].Progress in Organic Coatings: An International Review Journal,2007(2/3):136-145. |
| [8] | Danqing Zhu;Wim J. van Ooij .Enhanced corrosion resistance of AA 2024-T3 and hot-dip galvanized steel using a mixture of bis-[triethoxysilylpropyl]tetrasulfide and bis-[trimethoxysilylpropyl]amine[J].Electrochimica Acta,2004(7):1113-1125. |
| [9] | Bexell U;Grehk TM .A corrosion study of hot-dip galvanized steel sheet pre-treated with gamma-mereaptopropyltrimethoxysilane[J].Surface & Coatings Technology,2007(26):4734-4742. |
| [10] | Zucchi F;Frignani A;Grassi V et al.Organo-silane coatings for AZ31 magnesium alloy corrosion protection[J].Materials Chemistry and Physics,2008,110(2/3):263-268. |
| [11] | M. F. Montemor;M. G. S. Ferreira .Electrochemical study of modified bis-[triethoxysilylpropyl] tetrasulfide silane films applied on the AZ31 Mg alloy[J].Electrochimica Acta,2007(27):7486-7495. |
| [12] | 张津,吴超云,黄福祥,张微.AZ31B镁合金表面硅烷处理研究[J].中国腐蚀与防护学报,2008(03):146-150. |
| [13] | 吴超云,张津,高琪.氨基硅烷化对AZ31B镁合金阴极电泳涂层性能的影响[J].稀有金属,2010(06):797-801. |
| [14] | Saju Pillai;Ranjith Krishna Pai .Effect of lateral morphology formation of polymer blend towards patterning silane-based SAMs using selective dissolution method[J].Ultramicroscopy,2008(5):458-464. |
| [15] | 胡吉明,刘倞,张金涛,张鉴清,曹楚南.铝合金表面BTSE硅烷化处理研究[J].金属学报,2004(11):1189-1194. |
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