摘要
Al发生氧化后可以生成具有致密组织结构的氧化膜层,能够显著改善钢基体的耐高温氧化性能。通过磁控溅射方法制得AlTiCrN涂层,以Na2SO4作为腐蚀介质对其进行了热腐蚀性能测试。研究结果表明:形成了具有致密结构的涂层,存在许多短棒状颗粒,发生了丘陵起伏。相邻颗粒形成了紧密排列的状态,并未产生微孔或裂纹。涂层达到了接近70μm的厚度,获得更强的膜基结合效果,有效避免涂层发生剥落情况。以900℃进行Na2SO4盐腐蚀中,产生了剥落的腐蚀产物,重量发生了负增长,达到了更大的腐蚀速。经过100 h处理时只达到0.51 mg/cm^2的腐蚀增重,表明涂层可以发挥优异耐热腐蚀效果,从而对钢基体组织发挥良好保护作用。900℃时进行硫酸钠盐腐蚀处理时,氧化物出现了碱性溶解结果,涂层形成蜂窝结构,产生更多腐蚀坑。
The surfaces of 316 L stainless steel,an widely used heating ventilation and air conditioning material,were modified with magnetron co-sputtered AlTiCrN coating.The microstructures and corrosion behavior of the AlTiCrN-coatings,before and after surface corrosion in 800~1000℃range with sprayed Na2SO4+NaCl salts,were characterized with X-ray diffraction,scanning electron microscopy and corrosion kinetics measurement.The results show that the AlTiCrN coating matters.Specifically,few micro crack/pore existed on the surfaces of 70μm thick,compact and dense AlTiCrN coating,with strong interfacial adhesion and comprising Al,Ti3Al and AlCr phased columnar grains and micro-bumps.When it comes to high temperature corrosion resistance,the AlTiCrN coating significantly outperforms 316 L steel,possibly because of formation of the Al2O3 and Cr2O3 corrosion barrier.The corroding in Na2SO4 at 900℃significantly increased the porosity and etch-pit density,and promoted alkaline dissolution of the oxides.
作者
王智玉
周浩
Wang Zhiyu;Zhou Hao(Department of Civil Engineering,Henan Polytechnic College of Architecture,Zhengzhou 450064,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第11期1029-1033,共5页
Chinese Journal of Vacuum Science and Technology
基金
山东建筑大学博士基金项目(0000601523)。
