电镀锌钢硅烷-有机膦酸复合钝化膜的制备及性能表征  

Preparation and Characterization of the Silane-Phosphonic Acid Composite Passivation Coating for Electrogalvanized Steel

作　　者：管勇[1] 刘建国[1] 严川伟[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,辽宁沈阳110016

出　　处：《电化学》2010年第4期378-384,共7页Journal of Electrochemistry

基　　金：国家自然科学基金(21003141)资助

摘　　要：利用N-(β-氨乙基)-γ-氨丙基三甲氧基硅烷(AAPTMS)、γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷(GPTMS)和1-羟基亚乙基-1,1-二膦酸(HEDP),在电镀锌钢基体上制备了一种新型硅烷-有机膦酸复合钝化膜.X射线光电子能谱、傅立叶变换红外光谱以及中性盐雾试验、动电位极化曲线和电化学阻抗谱测试表明:该复合钝化膜主体结构由Si—O—Si、Si—O—P等组成;120 h中性盐雾试验后白锈面积小于5%,达到铬酸盐彩色钝化膜水平;且其腐蚀反应呈现更为明显的阳极扩散控制特征,属于物理阻挡机制.A new silane-phosphonic acid composite passivation coating process has been developed for the protection of electrogalvanized steel based on N-（β-aminoethyl）-γ-aminopropyltrimethoxysilane（AAPTMS）,γ-（2,3-epoxypropoxy）propyltrimethoxy-silane（GPTMS） and 1-hydroxy ethylidene-1,1-diphosphonic acid（HEDP）.The results of X-ray photoelectron spectroscopy（XPS）,Fourier transform infrared spectroscopy（FTIR）,potentiodynamic polarization scan,electrochemical impedance spectroscopy（EIS） and neutral salt spray（NSS） tests indicated that the major structure of the prepared silane-phosphonic acid composite passivation coating consisted mainly of Si—O—Si and Si—O—P bonds.The area of white rust was not more than 5% of the total panal after 120 h NSS test,which could be compared favourably with the chromate colour passivation coating.However,the corrosion reaction on the anode of the silane-phosphonic acid composite passivation coating had more distinct diffusion control characteristics and belonged to the physical blocking mechanism.

关 键 词：电镀锌钢 复合钝化 硅烷 有机膦酸 耐蚀性能 

分 类 号：TQ153[化学工程—电化学工业]