含硅有机-无机复合涂层对铝合金的保护作用  

Protection of Aluminum Alloys by Silicate-Based Organic-Inorganic Hybrid Coatings

作　　者：朱建龙[1] 王加余[2] 贾文杰[2] 李澄[2] 

机构地区：[1]江苏法尔胜新日制铁缆索有限公司,江苏江阴214445 [2]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《材料保护》2009年第2期25-27,共3页Materials Protection

摘　　要：为了改善铝合金材料的耐腐蚀性能,采用正硅酸乙酯为主要原料制备溶胶,涂覆于铝合金基体表面,经过适当处理后形成了具有有机-无机复合结构的涂层。采用电化学法、扫描电镜(SEM)等手段研究了涂层性能。结果表明,该涂层兼容了有机和无机成分的特点,涂覆试样的腐蚀电流密度可达(4.26～6.58)×10-6A/cm2,显示涂层对于铝合金基体具有与现行的含Cr(VI)传统表面处理工艺相当的保护效果。涂层有效地减缓了铝合金在含NaCl中性水溶液中的腐蚀,能够对铝合金基体提供有效的保护。本工艺不产生有害化学物质,是一项绿色环保工艺。A sol was prepared using tetraethyl orthosilicate(TEOS)as the raw material.The resulting sol was painted onto the surface of Al al-loys and properly heat-treated to generate organic-inorganic hy-brid coatings,aiming at improving the corrosion resistance of the Al alloys.The microstructure and properties of the coatingB were analyzed using an electrochemical device and a scanning electron microscope.Results indicated that the coatings combine the ad-vantages of both organic and inorganic species,making it feasible to well protect the Al alloys substrata.The coated specimen had a corrosion current of(4.26～6.58)×10-6 A/cm2,showing pro-tection comparable to conventional Cr(VI)electroplated coating for Al alloys.Moreover,the present coating was capable of effec-tively preventing Al alloys from corrosion in Cl-containing neutral aqueous solutions,and no harmful chemicals were discharged a-long with the present technology,showing environmental accepta-bility.

关 键 词：复合涂层 有机-无机 溶胶-凝胶 耐腐蚀性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]