通过盐雾实验和周期浸润实验研究了Mg含量对ZL101基SiCp/Al复合材料在中性及酸性环境中的腐蚀行为. 分别采用失重法、X射线衍射仪以及扫描电镜测定腐蚀速率、分析腐蚀产物的物相组成以及观察表面形貌. 结果表明: 加入Mg后, SiCp/Al复合材料的极化曲线出现了自腐蚀电流明显缓冲平台及钝化区, 合金表面生成具有保护性的Al2O3+SiO2氧化物膜, 减缓了复合材料腐蚀速度; 随着基体合金中Mg含量的增加, 复合材料在不同环境中的抗腐蚀能力得到提高, 盐雾环境中提高的要比周期浸润环境中的多; Mg的加入不仅能减少有害界面产物Al4C3的生成, 进而减少非晶态硫酸铝化合物的产生, 还能提高复合材料的渗透程度, 减少材料的缺陷, 大大增加复合材料的致密度, 从而提高材料的耐腐蚀性.
The corrosin resistance of SiCp/Al composites with different amount of Mg was investigated by the salt-fog test and alternate immersion test. Mass loss was used to evaluate the corrosion rate. The phase constituent and surface morphology of corrosion products were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Experiment results showed that,with the addition of Mg, a flat plateau appeared on the polarization curves indicating passivation of the composites with Mg. While oxide scales consisted of Al2O3 and SiO2 formed on the composites, thereby enhanced the corrosion resistance of SiCp/Al composites in the above two test environments. It was revealed that the amount of harmful phase Al4C3 could be reduced with the addition of Mg, thus decreased the amount of Alx(SO4)y(OH)z and of the corrosion products; Mg could also reduce defects in the composites, which might be beneficial to densifying the composites and enhancing their corrosion resistance.
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