测定合金中相的阳极极化曲线,过去常用粉末压型法、导电胶法,它们或因粉末用量太多,或因手续繁琐等而有一定的局限性。为此我们设计制造了“粉末电极”,用它测定了大量提取相粉末的极化曲线。经过5～6年的实践,证明这是一种粉末用量极少(仅几毫克到几十毫克),装置简单,使用方便,快速的粉末极化曲线测定方法。 图1是粉末电极装置图。电极用聚四氟乙烯或有机玻璃制成。粉末夹于白金片和滤纸之间,通过有螺纹的压盖压紧塑料压片、白金丝,确保粉末和白金片及白金丝的接触。实验时用夹具夹住“粉末电极”,滤纸面朝下,对准鲁金毛细管的尖咀,浸入电解液中。为防止纸面处滞留气泡,保证滤纸和粉末的湿润,在电极筒上靠近滤纸的地方开出通气的孔或槽。测定极化曲线时,为保持“粉末电 Determination of anodic polarization curve of the alloy phase, the past commonly used powder pressure method, conductive gel method, they are either too much powder, or due to complicated procedures and so have some limitations. To this end, we designed and manufactured the “powder electrode” which was used to measure the polarization curve of a large number of extracted phase powders. After 5 to 6 years of practice, proved that this is a very small amount of powder (only a few milligram to dozens of milligrams), the device is simple, easy to use, fast powder polarization curve determination. Fig. 1 is a powder electrode device diagram. Electrodes made of Teflon or Plexiglas. The powder is sandwiched between the plaque and the filter paper and pressed against a plastic tablet and white gold wire through a threaded gland to ensure contact between the powder and the platinum and platinum wires. Clamp experiment with the “powder electrode”, filter paper face down, pointed Ruijin capillary Tsui, immersed in the electrolyte. In order to prevent the retention of air bubbles at the paper surface, to ensure that the filter paper and the powder wet, open in the electrode tube near the filter paper vent hole or groove. When measuring the polarization curve, in order to maintain the "powder electricity