空蚀诱发铁基纳米结构的发生机制  

Generation Mechanism of Fe-base Nanostructures Induced by Cavitation Erosion

作　　者：刘峰斌[1] 曾箐雨 蒋涵[1] 崔岩[1] 曹雷刚[1] 杨越[1] 

机构地区：[1]北方工业大学机械与材料工程学院,北京100144

出　　处：《摩擦学学报》2016年第6期749-754,共6页Tribology

基　　金：国家自然科学基金项目(51575004);北京市自然科学基金项目(3162010)资助~~

摘　　要：利用超声空化设备,分别在自来水和去离子水介质中针对Q235钢进行表面振动空蚀处理.利用扫描电子显微镜、激光共聚集显微镜、拉曼光谱仪和透射电子显微镜对自来水介质中产生的空蚀坑及坑缘形貌、结构进行了分析.结果表明:Q235钢空蚀呈现典型的彩虹环结构,该结构是由δ-Fe OOH组成的具有不同叠加厚度的纳米薄片.纳米结构生成机制为空化作用引起的空蚀产物喷发堆积.其中,较之去离子水介质,自来水介质中产生的纳米薄片厚度和数量要大得多,表明离子对羟基氧化铁纳米结构的形成有促进作用.Cavitation erosion of Q235 steel in tap water and in deionized water was carried out by using an ultrasonic cavitation equipment. Then, surface morphology and phase structures of cavitated surface were investigated by using scanning electron microscopy, laser scanning confocal microscopy, Raman spectroscopy and transmission electron microscopy. The results show that the cavitated surface of Q235 steel exhibited a rainbow circle structure, which was composed of nano-sheet 6-FeOOH with different thickness. It deduced that the iron oxide nano-sheets were produced by cavitation induced eruption and pilling up. Compared to those in deionized water, the erupted nano-sheets produced in tap water were larger in quantity and thickness. Ions in tap water had influence on promoting the formation of iron oxide nanostructures.

关 键 词：超声空蚀 纳米结构 羟基氧化铁 

分 类 号：TV131.32[水利工程—水力学及河流动力学]