引用本文:王成勇,唐梓敏,丁峰,黄瑜,张涛,郑李娟,朱旭光.锆基非晶合金电解质等离子体抛光工艺及废液处理[J].中国表面工程,2024,37(1):267~279
WANG Chengyong,TANG Zimin,DING Feng,HUANG Yu,ZHANG Tao,ZHENG Lijuan,ZHU Xuguang.Plasma Electrolytic Polishing Process for Zr-based Metallic Glasses and Waste Liquor Treatment[J].China Surface Engineering,2024,37(1):267~279
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锆基非晶合金电解质等离子体抛光工艺及废液处理
王成勇1,2,3, 唐梓敏1,2,3, 丁峰1,2,3, 黄瑜1,2,3, 张涛1,2,3, 郑李娟1,2,3, 朱旭光1,2,3,4
1.广东工业大学机电工程学院 广州 510006;2.广东省微创手术器械设计与精密制造重点实验室 广州 510006;3.高性能工具全国重点实验室 广州 510006;4.东莞市逸昊金属材料科技有限公司 东莞 523690
摘要:
电解质等离子体抛光技术在非晶合金结构件的应用仍处于探索阶段,而且会产生含较高浓度的重金属和氟离子废液。 为了提高锆基非晶合金结构件的表面质量以满足其使役性能,研究抛光时间、工作电压、硫酸铵浓度、初始温度、工件入水深度、阳极挂具材料等电解质等离子体抛光工艺参数对锆基非晶合金表面粗糙度、晶化情况的影响,并利用正交试验进行参数组合优化,对比不同参数对于表面粗糙度的影响显著程度。最后针对抛光后废液污染的问题,探究并配套合适的废液处理方案。结果表明:影响抛光后材料表面质量因素的显著程度为抛光时间>工作电压>初始温度>硫酸铵浓度,最优抛光工艺参数组合为抛光时间 8 min,工作电压 220 V,初始温度 88 ℃,硫酸铵浓度为 5%,此时表面粗糙度为 0.103 μm。经化学混凝沉淀法和离子交换树脂法组合工艺处理后,出水废液中的重金属和氟离子浓度均能达国家电镀污染物排放标准。研究成果可为电解质等离子体抛光在锆基非晶合金的实际生产提供工艺指导,有助于推广锆基非晶合金结构件的产业化应用,促进锆基非晶合金的大规模工业生产。
关键词:  锆基非晶合金  电解质等离子体抛光  表面质量  工艺优化  废液处理
DOI:10.11933/j.issn.1007-9289.20221017002
分类号:TG707;X781
基金项目:国家自然科学基金(51735003);广东省基础与应用基础研究重大项目(2019B030302010)
Plasma Electrolytic Polishing Process for Zr-based Metallic Glasses and Waste Liquor Treatment
WANG Chengyong1,2,3, TANG Zimin1,2,3, DING Feng1,2,3, HUANG Yu1,2,3, ZHANG Tao1,2,3, ZHENG Lijuan1,2,3, ZHU Xuguang1,2,3,4
1.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006 , China;2.Guangdong Provincial Key Laboratory of Minimally Invasive Surgical Instruments andManufacturing Technology, Guangzhou 510006 , China;3.State Key Laboratory for High Performance Tools, Guangzhou 510006 , China;4.Dongguan Yihao Metal Technology Co., Ltd., Dongguan 523690 , China
Abstract:
Zirconium-based bulk metallic glasses (BMGs) exhibit metal and glass properties, excellent mechanical performance, corrosion resistance, and good biocompatibility. Zr-based BMG is currently the only amorphous alloy that has been industrially produced as a structural component, and its surface quality is a key factor affecting its operational performance. Plasma electrolytic polishing, which requires low electrical conductivity, is suitable for intricate workpieces and does not have any adverse effects on multiphase alloys. Thus, this is an ideal polishing technology for Zr-based BMG structural components. This study aimed to investigate the effects of plasma electrolytic polishing on the surface quality of Zr58Cu15.46Ni12.74Al10.34Nb2.76Y0.5 BMGs and obtain the optimal process parameters and polishing quality to provide process guidance for plasma electrolytic polishing in the actual production of Zr-based BMGs. The effects of different process parameters, such as polishing time, ammonium sulfate concentration of the electrolyte, working voltage, initial temperature, immersion depth of the workpiece, and anode rack materials, on the polishing surface roughness were studied using single-factor experiments. Subsequently, based on the single-factor experiments, we conducted four orthogonally designed experiments, each with four factors and four levels, using the factors that were more influential on the surface quality. These experiments aimed to minimize the surface roughness after polishing. Range and variance analyses were conducted to study the influence of each polishing process parameter on the surface roughness during polishing and determine the primary and secondary order of influence indicators, and the optimal combination of process parameters was obtained. To address the issue of waste liquor pollution after polishing, the effects of chemical neutralization-coagulative precipitation process and ion-exchange resin method on treating the waste liquor generated after polishing Zr-based BMGs were studied. A combination technology was proposed to treat the waste liquor. The quality of the effluent based on its compliance with the "National Emission Standard for Electroplating Waste Liquor" (GB21900—2008) was measuring. The results showed that the surface roughness of the Zr-based BMGs decreased and stabilized with increasing polishing time. A working voltage that was too high or too low could not achieve good surface quality, and the lowest surface roughness was achieved at a working voltage of 210 V. Ammonium sulfate was the primary component of the electrolyte, and ammonium sulfate concentrations that were too high or too low could affect the polishing effect. A concentration of 4.5% resulted in the lowest surface roughness. As the initial temperature increases, the roughness of the polished surfaces decreases. The immersion depth of the workpiece affects its surface pressure, which in turn, affects the formation of the surface air layer, with excessive immersion depth increasing the surface roughness. Copper anode rack materials can achieve lower surface roughness than stainless-steel anode rack materials. The results of the orthogonal experiment with the minimum surface roughness as the objective showed that the significant degree of factors affecting the surface roughness after polishing were the polishing time, working voltage, initial temperature, and ammonium sulfate concentration. The optimal combination of polishing process parameters was achieved with a polishing time, a working voltage, an initial temperature, and an ammonium sulfate concentration of 8 min, 220 V, 88 ℃, and 5%, respectively. The optimal surface roughness obtained in the experiments was 0.103 μm. The chemical neutralizing-coagulative precipitation process or ion-exchange resin method alone could not meet the "National Emission Standard for Electroplating Waste Liquor" through a single waste liquor treatment process. However, a combination of the two could effectively treat heavy metals and fluoride ions in the waste liquor generated after the polishing of Zr-based BMGs and reduce the concentration of heavy metals and fluoride ions in the effluent to meet the national standard for electroplating waste liquor. The research results will be helpful for promoting the industrial application of Zr-based BMG structural components and mass production and application of Zr-based BMGs.
Key words:  Zr-based BMGs  plasma electrolytic polishing  surface quality  process optimization  waste liquor treatment
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