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《金属表面有机-无机防腐杂化膜制备及其性能的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、南京航空航天大学硕士学位论文摘要为提高金属的耐腐蚀性能,本文采用溶胶-凝胶法,以γ-氨丙基三乙氧基硅烷(γ-APS)和正硅酸乙酯(TEOS)为硅源,乙酸为催化剂制备了杂化溶胶,通过浸渍-提拉法,在低碳钢基体表面制备了有机-无机杂化涂层。在溶胶的配制过程中,溶液PH值应控制在4~4.5之间,TEOS与γ-氨丙基三乙氧基硅烷摩尔比为1:5,乙醇的加入量为γ-APS与TEOS总摩尔含量的4倍左右。当涂覆膜厚为10μm且热处理温度为300℃时,不仅能够得到由Si-O-Si键组成的空间交联结构而且能够使杂化溶胶的有机组分得到大部分
2、的保留,提高了杂化膜的强度以及耐腐蚀性能,有利于金属基体的保护。为改善杂化膜的性能,在溶胶中添加纳米二氧化硅粒子,使得溶胶的粘度增大,凝胶时间缩短,且增强了杂化材料的热稳定性,Si-O-C、Si-C等化学键分解转变温度为400℃,高于未掺杂时的300℃。当纳米SiO2粒子加入量为3g时,杂化膜表面完整、致密、均匀、团聚现象不明显,杂化膜的硬度、附着力和耐冲击性能都有所提高。结合Tafel曲线和EIS图谱的测试可以得知,在实验选取的参数范围内,当纳米二氧化硅掺杂量为3g时杂化膜的耐蚀性能也是最好的。关键词:溶胶-凝胶法,浸
3、渍-提拉法,有机无机杂化膜,防腐蚀,纳米二氧化硅I金属表面有机-无机防腐杂化膜制备及其性能研究AbstractOrganic-inorganichybridsolswerepreparedbysol-gelmethod.Tetraethoxysilane(TEOS)andγ-aminopropyltriethoxysilane(γ-APS)wereusedasthesiliconsource,aceticacidwasusedasthecatalyst.Thecoatingsweredip-coatedonmildste
4、elsubstrates,inordertoimprovethecorrosionresistanceofthesteel.Duringthepreparationofthesol,thesolutionpHshouldbecontrolledat4~4.5,themolratioofTEOSandγ-APSis1:5,themolalquantityofethanolisabout3timesmorethanthetotalcontentofTEOSandγ-APS.Whenheatedat300℃andthethic
5、knessoffilmis10μm,thehybridcoatingnotonlyhastheSi-O-Sispacialinterlacedstructure,butalsoreservesthegreatmassoforganicgroups.Thereby,thesearebenefitfortheenhancementoftheperfectionandcorrosionresistanceaboutthehybridfilm,soforprotectionofthemetalsubstrates.Inorder
6、toenhancetheperformanceofhybridfilm,thesilicananoparticleswereadded.Theyaugmentedtheviscosityofsol,shortenedthegelationtimeandimprovedtheheatstabilityofthehybridmaterial.ThebreakingtemperatureoftheSi-O-C,Si-Cetc.bondis400℃,whichishigherthannonadulteratedmaterial(
7、300℃).WhentheadditionalquantityofSiO2nanoparticlesis3grams,thehybridfilmisintegrated,dense,uniformandconglomeration-free.Thehardness,adhesionandconcussionresistancebecometobehigher.WiththeTafelandEIStests,takethehybridfilmcorrosionresistanceintoaccount,itcanbecon
8、cludedthattheadditionof3gramsSiO2nanoparticlesisthebestchoicewithintheexperimentalparameters.Keywords:sol-gelmethod,dip-coating,organic-inorganichybridfilm,cor