热镀锌钢板表面氨基硅烷膜的制备及其耐腐蚀性能

Preparation and Corrosion Resistance of Amino Silane Deposited Film on Hot-Dip Galvanized Steel Sheets

为了减少金属材料硅烷化处理时挥发性有机物的排放,采用水溶性氨丙基三乙氧基硅烷(γ-APS)处理液在热镀锌钢板表面沉积了γ-APS膜。以NaCl溶液浸泡失重、塔菲尔极化曲线和电化学阻抗谱测技术,研究了γ-APS膜的耐蚀性能;通过傅立叶红外反射光谱(FTIR)和X射线光电子能谱(XPS)对γ-APS膜的化学组成、结构及形貌进行了分析、表征。结果表明:γ-APS膜主要由Zn,Si,O,N和C等元素组成,并以Si-O-Si与Si-O-Zn化合键形成网络结构;γ-APS膜显著提高了热镀锌钢板的耐腐蚀性能。

Gamma-aminopropyltriethoxysilane(γ-APS) film was deposited on the surface of hot-dip galvanized steel sheets.Weight loss tests in sodium chloride solution as well as measurements of Tafel polarization curves and electrochemical impedance spectra were carried out to evaluate the corrosion resistance of the γ-APS film.The chemical composition,microstructure and morphology of the film were analyzed by means of Fourier transformation infrared spectrometry and X-ray photoelectron spectroscopy.Results indicate that as-prepared γ-APS film consists of Zn,Si,O,N and C.Network structure was formed in the film via Si-O-Si and Si-O-Zn covalent bonds.The γ-APS film significantly increased the corrosion resistance of the steel substrate.