On the products derived in the electrolyte from electrochemical micro-machining of SS 316L

Chen En Lu, Ching Yuan Bai, Ming Der Ger, Chin Wei Liu, Jung Chou Hung

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemical micro-machining has been extensively used in metal processing. It was of interest to study the product effect on the electrochemical micro-machining and to diminish this effect by removing the products. In this work, SUS 316L stainless steel was electrochemical micro-machined in NaCl and NaNO3 electrolytes, respectively to investigate this effect. The experiments revealed that cations such as Fe, Cr, and Ni ions were dissolved in the NaCl and some corresponding solid particles like Fe(OH)2, Cr(OH)3, and Ni(OH)2 were dispersed in the solution. The Cr3+ dissolved in NaNO3 tended to be oxidized to form Cr6+ in under high voltages. The electrolyte could be treated by reduction of Cr6+ into Cr3+, and to form chromium hydroxide deposited on the cathode. Almost all other metal hydroxides dispersed in the solution could be removed by filtration.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalChung Cheng Ling Hsueh Pao/Journal of Chung Cheng Institute of Technology
Volume42
Issue number2
StatePublished - Nov 2013

Keywords

  • Microscopic electrochemical machining
  • NaCl
  • NaNO3
  • Product
  • SUS 316L

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