纳米二氧化硅颗粒增强镁基复合材料在典型介质溶液中的耐蚀性研究

Corrosion resistance of nano silica particles reinforced magnesium matrix composites in a typical medium solution

本文以纯镁粉末为基体材料,以纳米二氧化硅颗粒为增强相,按照原材料之间三种不同的体积配比,采用粉末冶金法制备出了三种纳米二氧化硅颗粒增强镁基复合材料样品。文中用扫描电子显微镜观察、对比了样品的显微组织,研究出了纳米二氧化硅颗粒的加入对镁基体产生的影响;用动电位极化试验法对三种样品在不同温度的典型介质溶液(Na_2SO_4溶液和Na Cl溶液)中的腐蚀行为进行了研究,从而分析出纳米二氧化硅颗粒增强镁基复合材料的腐蚀规律和腐蚀机理,进而建立其腐蚀模型。

Three kinds of samples of nano silica particles reinforced magnesium matrix composites were prepared taking pure magnesium powder as matrix material and nano silica particles as reinforcement, according to three different volume ratios of raw materials. In this paper, the microstructures of the sample were observed by the scanning electron microscopy and the influences of uano silica particles on magnesium matrix were studied. The corrosion behavior of three samples in a typical medium solution （ Na2SO4 and NaCl solution） at different temperature was researched by the potentiodynamic polariza- tion method, and the corrosion rule and mechanism of nano silica particles reinforced magnesium matrix composite were analyzed, then its corrosion model established.