热处理工艺对爆炸复合Pt-Ti电极电化学性能的影响

Effect of Heat Treatment on Electrochemical Performance of Pt-Ti Electrodes Prepared by Explosive Combination Method

对爆炸复合工艺制备的Pt-Ti电极试样分别进行300℃×1.5 h、450℃×1 h回复再结晶退火及650℃×1 h完全再结晶退火后,利用扫描电子显微镜(SEM)对加工态及退火态Pt-Ti电极的Pt层及扩散层形貌进行了研究,并对比了加工态及退火态试样电化学性能的差异。结果表明:加工态和退火态Pt-Ti电极的Pt层形貌并无明显差异,均具有沿轧制方向的加工流线;不同退火工艺均可使Pt-Ti电极出现约2μm厚的扩散层界面,提高了两种金属的结合强度;热处理工艺对Pt-Ti电极的电化学性能具有重要影响,300℃×1.5 h、450℃×1 h回复再结晶退火可提高Pt-Ti电极的抗腐蚀性能,而650℃×1 h完全再结晶退火工艺则使Pt-Ti电极的抗腐蚀性能显著下降。不同退火工艺均使爆炸复合Pt-Ti电极Pt层的活性降低。

In this paper, the Pt-Ti electrodes were fabricated by explosive combination method. The samples of asworked Pt-Ti electrodes were annealed in stress relief annealing process at 300 ℃ for 1.5 hours and 450 ℃ for 1 hour, and annealed in recrystallization annealing process at 650 ℃ for 1 hour. The Pt layer morphologies and interfaces of asworked and annealed Pt-Ti samples were investigated by scanning electron microscope. Meanwhile the electrochemical performance of Pt-Ti samples at different states were studied in the comparison test. The results show that there are obvious fluxlines along the rolling direction on the surface of samples at different states. The different heat treatments can all cause 2 μm interface, which can improve the combination strength of Pt layer and Ti matrix. To electrochemical performance, the stress relief annealing process can improve the properties of corrosion-proof, while recrystallization annealing process makes it weak. Different heat treatments all can reduce the surface activity of the Pt layer.