Effects of RPM, Bath Temperature and Anodizing Time in Anodizing for Mg-AI Alloy Under Constant Current

摘要

We studied the effects of solution RPM, bath temperature, and time in anodizing AZ91 under a constant current density of 750 mA/cm~2 in a 1 M NaOH solution. In general, increasing the anodizing time, RPM, and temperature of the bath improved the corrosion resistance. The thickness of the anodic oxide film likely grew by increasing the time required to generate the active dissolution reaction. When anodizing at 750 mA/cm~2, we evaluated a 300-3600-s range in anodizing time, 0-1500 RPM, and 296-373 K bath temperatures, and determined that 3600 s, 1500 RPM, and 373 K comprised the optimum conditions.