SiC_p/2024Al铝基复合材料及其阳极氧化膜的腐蚀行为

用电化学方法研究了碳化硅颗粒增强2024铝(SiCp/2024Al)基复合材料及其硫酸阳极氧化膜在35%NaCl水溶液中的耐蚀性;作为比较,对2024Al的耐蚀性也进行了研究·结果表明,SiCp/2024Al复合材料在35%NaCl水溶液中比相应的基体金属有较大的腐蚀敏感性·SiCp/2024Al复合材料的阳极氧化膜具有良好的耐NaCl溶液腐蚀的能力,但其耐蚀性不如2024Al合金的阳极氧化膜,这是由于氧化膜中SiC颗粒的存在破坏了氧化膜的完整性和均匀性所致·

Corrosion Behavior of SiCp/2024Al Metal Matrix Composite and Its Anodized Coating

The corrosion resistance of 17% SiC particle reinforced 2024 aluminum metal matrix composite (17%SiC p/2024Al) and its sulfuric acid anodized coating in 3 5% NaCl aqueous solution was investigated by the electrochemical method. The corrosion resistance of 2024Al was also investigated for comparison. The results show that the SiC p/2024Al metal matrix composite is more susceptible to corrosion than its matrix alloy in the solution. The anodized coating on the 2024Al provides excellent corrosion protection to 3 5% NaCl solution. The anodized coating on the SiC p/2024Al 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.