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采用硅烷A-187为前驱体,制备了一种应用于2024铝合金基体表面的无铬硅烷转化膜。通过扫描电子显微镜(SEM)、能谱(EDS)、表面分析系统(XPS)、中性盐雾实验、动电位极化曲线和电化学阻抗谱对硅烷膜的表面/截面形貌、成分及耐蚀性能进行了表征和分析。结果表明:制备的无铬硅烷水解液处理后的2024铝合金具有优异的耐蚀性能,中性盐雾实验168 h,无腐蚀产物产生,硅烷膜使铝合金的腐蚀电位正移154 m V;硅烷膜下基体腐蚀反应的阻抗值随浸泡时间逐渐升高,说明硅烷膜可以有效抑制基体的腐蚀,为2024铝合金提供良好防护。
A silane-free silane conversion coating was prepared on the surface of 2024 aluminum alloy substrate using silane A-187 as a precursor. The surface / cross section morphology, composition and resistance of the silane films were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), surface analysis system (XPS), neutral salt spray, potentiodynamic polarization curve and electrochemical impedance spectroscopy Erosion performance was characterized and analyzed. The results show that the prepared 2024 aluminum alloy without chromium hydrolyzate has excellent corrosion resistance. The neutral salt spray experiment for 168 h produces no corrosion products and the silane film causes the corrosion potential of the aluminum alloy to shift forward 154 mV. Silane membrane under the substrate corrosion reaction resistance value gradually increased with the soaking time, indicating that the silane film can effectively inhibit the corrosion of the substrate, providing good protection for the 2024 aluminum alloy.