SiC_p/Al基复合材料的耐蚀性研究

Corrosion Protection of SiCp/Al Metal Matrix Composite

用电化学方法和腐蚀失重法研究了 2 0 2 4Al和SiCp/ 2 0 2 4Al基复合材料在 3.5 %NaCl水溶液中的耐蚀性 ,用电化学交流阻抗技术对它们的硫酸阳极氧化膜的耐蚀性进行了研究。结果表明 ,SiCp/ 2 0 2 4Al复合材料在 3.5 %NaCl水溶液中比相应的基体金属有较大的腐蚀敏感性。SiCp/ 2 0 2 4Al的阳极氧化膜耐NaCl溶液腐蚀能力不如 2 0 2 4Al合金的阳极氧化膜 。

The corrosion resistance of 2024 Al and SiCp/2024Al metal matrix composite in 3. 5% NaCl solution was studied by electrochemical methods and corrosion loss weight tests. And the corrosion protection of sulfuric acid anodized coating on these materials was measured by electrochernical impedance spectroscopy. The results show that the SiCp/2024Al metal matrix cornposite is more susceptible to corrosion than its matrix alloy in 3. 5% NaC1. For 2024A1 the anodized coating provides excellent corrosion protection to salt solution. The anodized coating on the SiCp!2024A1 provides satisfactory corrosion protection but it is not as effective as for 2024Al because the structure of the anodized layer is affected by the SiC particulates.