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采用电弧离子镀技术在炮钢表面制备NiCoCrAlYSi涂层,涂层在空气中950℃恒温氧化100h,借助XRD、SEM和EDS对涂层及氧化产物进行分析,研究其高温氧化行为。结果表明,包覆NiCoCrAlYSi涂层的炮钢极大的提高了其高温抗氧化性,涂层表面主要形成了连续、致密的α-Al2O3氧化膜,涂层氧化动力学曲线符合抛物线规律;同时,由于电弧离子镀涂层存在的针孔缺陷,O2会进入到涂层内部,并在针孔内和涂层与炮钢基体的界面反应形成富Al的氧化物。
The NiCoCrAlYSi coating was prepared on the surface of gun steel by arc ion plating. The coating was heated in the air at 950 ℃ for 100h. The coating and oxidation products were analyzed by XRD, SEM and EDS to study its high temperature oxidation behavior. The results show that the coating of NiCoCrAlYSi coated steel greatly enhance the high temperature oxidation resistance, the coating surface mainly formed a continuous, dense α-Al2O3 oxide film, the coating oxidation kinetics curve in line with the parabolic law; the same time, Due to the pinhole defects existing in the arc ion plating coating, O2 enters the interior of the coating and reacts with the interface between the coating and the gunite substrate to form an Al-rich oxide within the pinhole.