With the advantageous properties of a high melting point, high strength at high temperatures, low vapor pressure, and good thermal conductivity, tungsten is widely used in several advanced industrial applications. Micro structures such as micro holes and grooves are commonly prepared on the tungsten surface to enhance its heat transfer performance. Electrochemical machining (ECM) is a promising method of generating micro structures on the metal surface. Typically, an alkaline solution is employed as an electrolyte during tungsten ECM. Unfortunately, significant stray corrosion commonly occurs on the tungsten surface when high-concentration alkaline solutions (NaOH > 1 wt.%) are used. However, the machining efficiency decreases sharply when the concentration is less than 0.5 wt.%. In order to improve machining efficiency and accuracy, this paper proposes a novel mixed electrolyte consisting of NaClO3 mixed with a low concentration of NaOH for electrochemical machining of tungsten. The NaClO3 is used to increase the conductivity as well as to improve the formation of oxide films on the tungsten surface in order to avoid stray corrosion. NaOH is used to ensure continuous machining by removing the oxide film in the region being machined. The influence of the electrolyte composition and concentration on electrochemical dissolution of tungsten is analyzed by measuring the anode polarization curve and open circuit potential, and an optimized electrolyte with of 10 wt.% NaClO3 and 0.3 wt.% NaOH is identified. This optimized electrolyte enables generation of micro-through holes with inlet and outlet diameters of 500 and 410 μm, respectively, using a tube electrode with a diameter of 250 μm. The feed rate of the tool reaches 24 μm/min, which is 4 times faster than in previous studies.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: May 28, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera