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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Al_2O_3+SiO_2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Al_4C_3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 corrosion behavior of ZL101-based SiCp / Al composites in neutral and acidic environments was investigated by salt spray and cyclic infiltration experiments.The corrosion rate was measured by weight loss method, X-ray diffraction and scanning electron microscopy respectively, and the corrosion products The results show that the polarization curve of SiCp / Al composites shows a buffer layer and a passivating area of self-corrosion current, and the surface of the alloy is protected by the oxidation of Al 2 O 3 + SiO 2 The corrosion rate of the composites decreased with the increase of the content of Mg in the matrix alloy. The corrosion resistance of the composites increased in different environments and increased in the salt spray environment than in the cyclic infiltration environment. The Mg Adding not only can reduce the formation of harmful interface products Al_4C_3, thus reducing the production of amorphous aluminum sulfate compounds, but also improve the penetration of composites, reduce material defects, greatly increase the density of composite materials, thereby enhancing the material corrosion resistance Sex.