摘要
目的研究不锈钢经电解质等离子体抛光后,表层元素化学形态的变化及机制,为材料去除机理、表面性能、工艺参数、抛光液处理等相关研究提供参考。方法通过表面粗糙度测试仪、扫描电镜分别对加工前后试样表面粗糙度、形貌变化进行测试表征。通过X射线光电子能谱技术,对加工前后试样表面及抛光液沉积物中主要元素的组成、化学态、分子结构进行测试表征。结合加工现象及材料去除机理,分析加工过程中固、液、气、等离子体之间的界面反应。结果电解质等离子体抛光后,试样表面平整光亮,预处理中粗磨的痕迹已被完全去除。Ra平均值由0.311μm降低至0.045μm,Rq平均值由0.442μm降低至0.059μm,Rz平均值由3.260μm降低至0.369μm。与抛光前试样相比,抛光后试样表层检测到S^(+6)和Ni^(+2),沉积物中的Fe均为Fe^(+3),Cr主要为Cr^(+3),含有少量Cr^(+6)。抛光后试样表面及沉积物中金属元素的化合物主要为氧化物和氢氧化物。结论电解质等离子体抛光316LVM不锈钢有显著效果,抛光后试样表面粗糙度明显降低。抛光过程中,试样表面主要发生氧化反应,氧化性物质主要来自水。硫酸根离子在加工中与金属离子生成了硫酸盐,可能未参与氧化还原反应。试样表面的铁、铬、镍以氧化态形式被去除,抛光液中氧化态的铁、铬以沉淀形式存在,氧化态的镍以络合物的形式存在。
The change and mechanism of chemical forms of elements in the surface layer of stainless steel after electrolyte plasma polishing were studied,which can provide a reference for material removal mechanism,surface properties,process parameters,polishing solution treatment and other related research.A surface roughness tester and scanning electron microscope were employed to test and characterize the changes in surface roughness and morphology of the samples before and after processing.X-ray photoelectron spectroscopy was employed to test and characterize the composition,chemical state,and molecular structure of the main elements on the surface of the sample and in the polishing liquid sediment before and after processing.Then the interface reaction between solid,liquid,gas,and plasma in the process of processing was analyzed combined with the processing phenomenon and material removal mechanism.The results showed that the surface of the sample was smoother and brighter after electrolyte plasma polishing,and the traces of rough grinding in the pretreatment have been completely removed.The average value of Ra decreased from 0.311μm to 0.045μm,the average value of Rq decreased from 0.442μm to 0.059μm,and the average value of Rz reduced from 3.260μm to 0.369μm.Compared with the sample before polishing,S^(+6) and Ni^(+2) were detected on the surface of the sample after polishing.And it was found that the Fe in the sediment was Fe^(+3),and the Cr was mainly Cr^(+3),with a small amount of Cr^(+6).The main compounds of metal elements on the polished sample surface and in the deposit are oxides and hydroxides.Therefore,electrolyte plasma polishing of 316LVM stainless steel has a significant effect,and the surface roughness of the sample is significantly reduced after polishing.During the polishing process,the surface of the sample mainly undergoes oxidation,and the oxidizing substances mainly come from water.And sulfate ions and metal ions form sulfate,which may not participate in the redox reaction.The iron,chromium,
作者
段海栋
孙桓五
纪刚强
杨冬亮
李思雪
DUAN Hai-dong;SUN Huan-wu;JI Gang-qiang;YANG Dong-liang;LI Si-xue(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;National Demonstration Center for Experimental Coal Resource and Mining Equipment Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2022年第6期346-353,389,共9页
Surface Technology
基金
山西省重点研发计划(201903D121091)。
