颗粒增强铝基复合材料阳极氧化与耐蚀性的研究

基体中加入与铝合金基体电位不同、高体积分数的碳化硅和石墨颗粒增强材料,可能导致材料的耐蚀性降低.采用盐雾腐蚀和硬质阳极氧化方法对4种喷射沉积制备的颗粒增强铝基复合材料和一种喷射沉积锭坯颗粒增强铝基复合材料的腐蚀行为及阳极氧化工艺进行了研究.结果表明,颗粒增强铝基复合材料具有较高的腐蚀率,腐蚀形态均为明显的点蚀;在适当阳极氧化工艺条件下,颗粒增强铝基复合材料表面可以制得优良耐蚀性的硬质阳极氧化膜.

Anodic Oxidation and Anticorrosion of Particle Reinforced Aluminum- Matrix Composites

Anticorrosion of aluminum material may decrease when it is reinforced using SiC and graphite particles with high volume fraction and potential different from substrate. Corrosion behaviors and anodic oxidation technology of four kinds of particle -reinforced aluminum-matrix composites and an ingot-shaped a- luminum- matrix composite fabricated by spraying atomization and deposition were investigated using salt spray test and hard anodic oxidation method. Results show that the corrosion rates of particle reinforced aluminum- matrix composites are all higher than that of substrate, and the corrosion patterns all presents a pitting mor- phology. In a given anodic oxidation condition, a hard anodic ox- idation film can be obtained on the surface of aluminum- matrix composite with an excellent anticorrosion.