磷酸铈掺杂环氧-硅氧烷涂层的制备及其性能研究  

Preparation of cerium phosphate-doped epoxy–siloxane coating and study on its properties

作　　者：周街胜 蓝秀玲 张胜军 丁金森 彭叔森 刘光明[2] ZHOU Jie-sheng;LAN Xiu-ling;ZHANG Sheng-jun;DING Jin-sen;PENG Shu-sen;LIU Guang-ming(Guangzhou Special Pressure Equipment Testing Institute,Guangzhou 510000,China)

机构地区：[1]广州特种承压设备检测研究院,广东广州510000 [2]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《电镀与涂饰》2018年第22期1039-1044,共6页Electroplating & Finishing

基　　金：广东省质量技术监督局科技项目(2017CT14);江西省教育厅项目(GJJ160717);国家自然科学基金青年项目(51501214)

摘　　要：以磷酸钠和硝酸铈为原料,采用沉淀法合成了磷酸铈,然后将其混于用γ-氨丙基三乙氧基硅烷(KH-550)和环氧树脂E51以化学接枝法制备的环氧-硅氧烷清漆,制得磷酸铈掺杂环氧-硅氧烷涂层。考察了磷酸铈用量对涂层力学性能和耐蚀性的影响,并测量了其在3.5%NaCl溶液中的电化学阻抗谱。在扫描电镜中观察到磷酸铈颗粒呈微纳米六方晶系结构。当磷酸铈质量分数为2.5%时,其在涂层骨架中的分散性较好,提升了涂层的致密性,所制涂层具有最好的综合性能:铅笔硬度6H,耐冲击性(1 kg)40 cm,附着力1级,柔韧性1 mm,中性盐雾试验72 h后外观完好。Cerium phosphate was synthesized by precipitation reaction of sodium phosphate and cerium nitrate,and then mixed with an epoxy–siloxane varnish,which was prepared from 3-aminopropyltriethoxysilane(KH-550)and epoxy resin E51 by chemical grafting,to form a cerium phosphate-doped epoxy–siloxane coating.The effect of cerium phosphate content on mechanical properties and corrosion resistance of the coating was studied.The electrochemical impedance spectra of the coatings prepared with different contents of cerium phosphate were measured in 3.5%NaCl solution.The cerium phosphate particle had a hexagonal micro/nano-crystal structure as shown in the scanning electron micrograph.The coating containing 2.5wt.%cerium phosphate featured a pencil hardness of 6H,a failure height of 40 cm for 1 kg impact,an adhesion strength of 1 grade,a flexibility of 1 mm,and good appearance after being suffered in neutral salt spray test for 72 h,showing the optimal comprehensive properties due to the good dispersion of cerium phosphate in the skeleton of the coating which contributed to the compactness improvement of the coating.

关 键 词：环氧树脂 硅氧烷 接枝改性 磷酸铈 掺杂 无机-有机杂化涂层 耐蚀性 

分 类 号：TQ630.7[化学工程—精细化工]