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制备了一种由有机硅树脂和无机金属组成的硅烷钝化液,该钝化液可以在铝表面形成有机无机杂化膜。研究了钝化液浓度、钝化液p H、硅树脂的质量分数和聚氨酯树脂的质量分数对杂化膜耐腐蚀性能的影响,并用傅里叶变换红外光谱仪对杂化膜进行红外光谱分析,通过SEM扫描电镜对杂化膜的微观形貌进行了表征,通过电化学实验对杂化膜进行测量,用开路电位、交流阻抗、tafel极化曲线研究不同条件下杂化膜的耐腐蚀性能。结果表明,钝化液浓度越高耐腐蚀性能越好。钝化液p H趋于3.9,硅树脂质量分数大约为21%,聚氨酯树脂质量分数为6%时,杂化膜耐腐蚀性能较好。
A silane passivation solution composed of a silicone resin and an inorganic metal was prepared. The passivation solution formed an organic-inorganic hybrid film on the aluminum surface. The effects of concentration of passivation solution, p H of passivation solution, mass fraction of silicone resin and mass fraction of polyurethane resin on the corrosion resistance of hybrid membranes were studied. The infrared spectra of hybrid membranes were analyzed by Fourier transform infrared spectroscopy, The morphology of hybrid membranes was characterized by scanning electron microscopy (SEM). The hybrid membranes were measured by electrochemical experiments. The corrosion resistance of hybrid membranes under different conditions was investigated by open circuit potential, AC impedance and tafel polarization curves. The results show that the higher the concentration of passivation solution, the better corrosion resistance. Passivation solution pH tends to 3.9, the silicone mass fraction of about 21%, the polyurethane resin mass fraction of 6%, the hybrid film corrosion resistance better.