cleaning copper from steel
in [Physics]
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From: Cwatters on 21 May 2010 17:50 "Peter Fairbrother" <zenadsl6186(a)zen.co.uk> wrote: > Any ideas on how to clean copper from steel - the steel is HSS in > expensive small bits, and should be left untouched. Ultrasonic cleaner?
From: Peter Fairbrother on 22 May 2010 12:12 hanson wrote: > > "Mark Thorson" <nospam(a)sonic.net> wrote: > .. >> Peter Fairbrother wrote: >>> They are used for cutting channels in copper and have a very aggressive >>> rake and are best used dry, consequently the limiting factor in their >>> use-life is when they get copper adhered to them - the steel itself is >>> still sharp but the cutting edge is obscured by copper. >> > "Mark Thorson" wrote: >> Perhaps you could run the blade backward >> and cut some aluminum to clean off the copper. >> > Earlier Peter Fairbrother wrote: >> Any ideas on how to clean copper from steel - the steel is HSS in >> expensive small bits, and should be left untouched. > >> > Earlier, "Mark Thorson" wrote: > If it's a very thin coppper layer, mercury might dissolve it without > attacking the steel. >> > hanson wrote: > You have been floating some pretty cool suggestions > here. The most intriguing, AFAIAC, was the one where > you suggested to use metallic Mercury. Toxicity aside, > which is over exaggerated anyway, have a bucket full > of Hg, submerge the degreased Fe/Cu parts into it, > leave it for a week or so, and voila, all the Cu globs, > EVEN large ones will be amalgamated away & off the steel, and you'll > have clean, shiny parts again without any further post treatment. > Congrats, Thorson, > hanson > Yeah, it'd probably work - as might exposure to acetylene - but I was hoping for something a bit more user-friendly, if possible... -- Peter Fairbrother
From: Mark Thorson on 22 May 2010 14:39 Cwatters wrote: > > Those were the days. Sounds like my school. We had the facilities to sand > cast small aluminium objects upto about 8 or 9 inches long. The safety > briefing involved the teacher pointing to burn marks on the ceiling above > the furnace. We had quite a good selection of machine tools as well. I still > remember the clang that a chuck key makes if you forget to remove it before > turning a lathe on :-( My dad taught high school electronics for many years. He had a PC board etching tank made out of an old car battery and some aquarium parts. He made a big caution sign for it. He once had a safety inspection from the insurer for the school. The only thing the inspector cited him for was having ungrounded soldering irons. One of his students said "What are you going to ground? The tip?". I guess "home-made tank of corrosive liquid" was not on the inspector's checklist.
From: Androcles on 22 May 2010 14:50
"Mark Thorson" <nospam(a)sonic.net> wrote in message news:4BF824E5.E6D8F5AE(a)sonic.net... | Cwatters wrote: | > | > Those were the days. Sounds like my school. We had the facilities to sand | > cast small aluminium objects upto about 8 or 9 inches long. The safety | > briefing involved the teacher pointing to burn marks on the ceiling above | > the furnace. We had quite a good selection of machine tools as well. I still | > remember the clang that a chuck key makes if you forget to remove it before | > turning a lathe on :-( | | My dad taught high school electronics for many years. | He had a PC board etching tank made out of an old | car battery and some aquarium parts. He made a | big caution sign for it. | | He once had a safety inspection from the insurer | for the school. The only thing the inspector | cited him for was having ungrounded soldering | irons. One of his students said "What are you | going to ground? The tip?". I guess "home-made | tank of corrosive liquid" was not on the inspector's | checklist. ========================================= Ferric chloride reacts quite slowly, although I don't recommend drinking it. You are getting into the realm of abrasive ash from volcanoes a thousand miles away killing aircraft or Mexican swine flu epidemics killing millions of people last year, two recent pushes of the panic button. And yes, the tip of an electric soldering iron should be grounded. Is that a problem? |