电沉积-热解法制备的Al_2O_3薄膜的抗高温氧化性能研究

Research on oxidation resistance of Al_2O_3 thin film prepared by electrodeposition-pyrolysis

采用电沉积-热解法在304不锈钢表面沉积了Al2O3薄膜,研究了电解液浓度、电沉积电压对Al2O3薄膜900℃抗高温氧化性能的影响。表面宏观形貌、XRD分析、氧化增重和氧化膜剥落动力学曲线结果表明电沉积-热解法制备的Al2O3薄膜降低了氧化初期基体表面的氧分压,促进了选择氧化的发生,因此显著提高了304不锈钢的抗高温氧化性能。在电沉积电压为25V、硝酸铝酒精浓度为0.10mol/L条件下制备的Al2O3薄膜抗高温氧化性能最佳。

Al2O3thin films are deposited on the surface of 304 stainless steel by electrodeposition-pyrolysis,and the effects of electrolyte concentration and electro-deposition voltage on the oxidation behavior of Al2O3 thin film at 900 ℃ are investigated.Macroscopic surface morphologies,XRD analysis and oxidation kinetics curves show that the electrodeposition-Al2O3 thin films reduce the partial pressure of oxygen at the initial oxidation stage on the substrate surface,promoting the selective oxidation,thus the oxidation resistance of 304 stainless steel is significantly improved.The high temperature oxidation resistance of Al2O3 film prepared under voltage of 25 Vand aluminum nitrate alcohol solution of 0.10mol/L is the best.