冷轧钢表面复合纳米硅烷膜的耐蚀性能研究

Study on Corrosion Resistance of Composite Nano Silane Films on the Surface of Cold Rolled Steel

采用正交试验法探讨了在冷轧钢表面制备复合纳米硅烷膜的最佳工艺条件,通过塔菲尔曲线研究了硅烷膜在3.50%NaCl溶液中的自腐蚀电流密度与自腐蚀电位。实验表明,形成复合纳米硅烷膜的最佳工艺条件为:水解温度为40℃、水解时间为8h、水解溶液的pH为10、水解溶液各组分的体积比为V(γ-APS硅烷)∶V(乙醇)∶V(水)=7∶22∶75、浸涂时间20min、固化温度90℃、固化时间20min。纳米材料最佳用量为0.3g.L-1。通过阳极极化曲线研究了存在与不存在纳米材料的硅烷膜的耐蚀性能,用扫描电子显微镜观察了在相同超电势下存在与不存在硅烷膜的冷轧钢在腐蚀前后的形貌变化。结果表明,复合纳米硅烷膜的耐蚀性能明显优于纯γ-APS硅烷膜。

It was studied on the best craftwork condition of composite nano silane films on the surface of cold rolled steel by orthogonal experiment, and the corrosion current density and corrosion potential of the composite nano si- lane films was studied in 3.5 % NaCl solution by Tafel curves. The experiment indicate , the optimum process condi- tions of prepared composite nano silane films as follows： hydrolysis temperature was 40 ℃, hydrolysis time was 8 h, the pH value of the solution was 10,100 mL solution containing 7 mL 7-APS and the composition of the solvent ethanol and water ratio was 22 ： 75, curing temperature of films was 90 ℃, coating time was 20 min, curing time was 20 min. The best dosage of ZSM-5 nanometer materials was 100 mL solution containing 30 mg ZGM-5 nanome- ter materials. The corrosion resistance of the composite nano silane films and nano silane without nanometer materi- als was studied by using anode polarization curve testing. The change in the shape of the composite nano silane films and nano silane without nanometer materials before and after corrosion testing under same overpotential was re- searched by scanning electron microscope. The study indicated that the corrosion resistance of composite nano silane films is apparently superior to pure γ-APS silane films.