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A KNOWLEDGE-BASED SYSTEM FOR WASTE MINIMZATION IN metal finishing AND ELECTROPLATING INDUSTRIES

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2000年第1期 42-50页

作者：张清宇

This paper introduces a knowledge based system for waste minimization in metal finishing and electroplating industries- MEPPI (minimization of environmental problems in processing industries) waste minimization techniques, such as process modification, raw materials reduction and resource recycling and recovery, and suggests its implementation in industries rather than end of pipe treatment. The data for process analysis, materials balance for each unit, and test data collection, should be inputted into MEPPI first. One can then obtain information on which unit will generate wastes, what kind waste will be produced, and the waste amount and content. Further analysis of this information can reveal if each unit is operating ideally and if the whole process is in the best state. MEPPI can indicate the possibility of waste minimization in every unit, provide all kinds of waste recovery and recycling methods for users to select from, and can reduce raw materials consumption so that the loading on the end of pipe treatment plant will be diminished. Realization of waste minimization will improve the economics of industries. MEPPI is a rich database, friendly interactive system integrating waste minimization audit calculation and waste minimization technique in a computer package. It can help designers to estimate the waste of a new factory and also process management or operators to minimize the release of hazardous or toxic waste into the environment.

关键词： waste minimization knowledge based system metal finishing electroplating

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Isotropic Tuning of Electrochemical Etching forthe Nanometric finishing of metals

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Nanomanufacturing and Metrology 2022年第3期5卷 283-296页

作者： Rong Yi Zejin Zhan Hui Deng Department of Mechanical and Energy Engineering Southern University of Science and TechnologyNo.1088Xueyuan RoadShenzhen 518055GuangdongChina

Isotropic etching polishing(IEP)based on the merging of isotropic etch pits has been proposed as a generic metal finishing approach.In this work,the tuning of the etching isotropy of various metals,which is the key to realizing the finishing effect of IEP,is studied by theoretical analysis and etching experiments.The isotropic etching of various metals can be realized through mass transfer polarization by adjusting the electrochemical parameters.The addition of sulfuric acid in the electrolyte is the most effective for tuning the isotropy of electrochemical etching.It can decrease the diffusion coefficient of metal ions,thereby increasing the resistance of mass transfer and transforming the electrochemical dissolution of metal into mass transfer polarization.In this study,the atomic and close-to-atomic scale surface finishing of various metals and alloys has been successfully achieved through isotropic etching.After etching at a current of 1.5 A for 3 min,the surface Sa roughness of TA2 is drastically reduced from 242 to 3.98 nm.After etching for 1 min at a current of 3 A,the surface Sa roughness of pure tungsten,NiTi,and CoCrNi decreases from 9.33,76.4,and 37.6 nm,respectively,to 1.16,2.01,and 2.51 nm,respectively.

关键词： ACSM metal finishing Isotropic etching polishing Electrochemical polishing

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