纳米晶化对Ni-25Cr-5Al-1S合金热生长氧化膜粘附性的影响  

Effect of Nanocrystallization on Adhesion of Thermally Grown Oxide Scale on Ni-25Cr-5Al-1S Alloy

作　　者：李倩[1] 彭晓[1] 王福会[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《腐蚀科学与防护技术》2010年第1期4-8,共5页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(50671115)

摘　　要：比较研究了高S铸态合金Ni-25Cr-5Al-1S(mass%)及其溅射纳米涂层在1000℃的氧化行为,结果表明:铸态合金在20小时恒温氧化中生长的氧化膜在冷却时发生严重剥落,氧化膜/基体界面局部区域S含量较高;而溅射纳米涂层没有发生氧化膜剥落现象,涂层/氧化膜界面上明显无S的存在.这说明Ni-25Cr-5Al-1S合金纳米化可以有效抑制S对氧化膜/合金界面结合的"毒化效应",提高了氧化膜的粘附性.The oxidation behavior of a high-sulfur-containing cast alloy Ni-25Cr-5Al-1S（ mass% ）and its magnetron-sputtered nanoerystalline coating were comparatively investigated in air at 1000℃ for 20 h. The oxide scale formed on the cast alloy suffered from severe spallation during cooling, and a high sulfur content was detected on the spalled area. However, the oxide scale on nanocrystalline coating was good adherent, and no sulfur was probed at the scale/coating interface. The results strongly suggest that the nanoerystallization of the high S alloy can remarkably enhance the adhesion of the oxide scale formed, through suppressing the interface segregation of S, which is believed a ＂poisonous＂ element weakening the interface bonding.

关 键 词：硫偏聚 溅射涂层 纳米晶 氧化膜粘附性 

分 类 号：TG172.82[金属学及工艺—金属表面处理]