摘要
ZA27/SiC_p复合材料在氯化钠溶液中浸泡30 d,通入氧气,研究腐蚀对其表观和显微组织的影响。通过复合铸造制备不同SiC粒子含量的复合材料。采用光学显微镜和扫描电子显微镜研究材料的显微组织,结果表明复合材料基体发生了腐蚀,且优先发生在富锌η相。腐蚀过程不影响嵌入基体合金中的SiC粒子。电化学极化测试表明,复合材料中SiC粒子含量的增加,导致复合材料的耐腐蚀性降低。
The influence of corrosion on the surface appearance and microstructure of particulate ZA27/SiCp composites was examined after 30 d immersion in a sodium chloride solution with the access of atmospheric oxygen. The composites with different contents of SiC micro-particles were synthesized via compo casting. Microstructural studies by means of optical microscopy （OM） and scanning electron microscopy （SEM） showed that corrosion occurred in the composite matrices, preferentially in regions of the η phase, rich in zinc. The corrosion processes did not affect the silicon carbide particles incorporated in the matrix alloy. According to the results of electrochemical polarization measurements, an increase in the content of SiC particles in the composite matrice has led to the lower corrosion resistance in the composites.
基金
The Ministry of Education, Science and Technological Development of the Republic of Serbia has supported financially this work through projects TR 35021 and OI 172005
关键词
金属基复合材料
ZA27合金
腐蚀
显微组织
极化电阻
腐蚀率
metal-matrix composites
ZA27 alloy
corrosion
microstructure
polarization resistance
corrosion rate
