论文部分内容阅读
将铝放入草酸-硫酸溶液中,在其表面形成耐化学腐蚀的阳极氧化层。生成的阳极氧化层的酸性溶解试验在38℃的35mL/L85%H3PO4+20g/LCrO3溶液中按ASTMB680-80标准进行。研究了硫酸浓度为160g/L时,草酸浓度、溶液温度、阳极电流密度对溶解速率和阳极氧化膜生成比R的影响。结果发现,在低温(5℃)和高电流密度(3A/dm2)的条件下,得到耐化学腐蚀性强、致密的氧化层。添加18g/L草酸有利于阳极氧化层的形成。采用扫描电子显微镜(SEM)、原子力显微镜(AFM)和辉光发射光谱(GDOES)来分析阳极氧化层的形貌和组成。
The aluminum into the oxalic acid - sulfuric acid solution on its surface to form a chemical resistant anodized layer. The acidic dissolution test of the resulting anodic oxide layer was performed according to the ASTMB 680-80 standard in a 35 mL / L 85% H 3 PO 4 + 20 g / L CrO 3 solution at 38 ° C. The effect of oxalic acid concentration, solution temperature and anode current density on the dissolution rate and anodic oxide film formation ratio R was studied when the concentration of sulfuric acid was 160g / L. The results show that, at low temperature (5 ℃) and high current density (3A / dm2) conditions, get a chemical resistant strong, dense oxide layer. Addition of 18g / L oxalic acid facilitates the formation of anodic oxide layer. The morphology and composition of the anodic oxide layer were analyzed by scanning electron microscopy (SEM), atomic force microscopy (AFM) and glow emission spectroscopy (GDOES).