I just purchased an induction furnace and a cooling unit. The cooling unit must be filled by water for cooling the induction spire and the power supply of the induction furnace, but what should be the specifications of the water? The supplier of the cooling unit recommends a corrosion inhibitor (not saying which one), but the supplier of the induction furnace fears that the inhibitor leads to a protective layer in the induction spire, thus decreasing the heat exchange and thus the lifetime of the system. What should I do then? Another question: water with a conductivity ranging from 100 to 250 µS/cm is suggested. These values are not so low. Why, and why not just using distilled water in a closed circuit like this one?
Yes, but, demineralized water will do. Distiled water is more than necessary. If you want you can clean the system first - this means: spill away the first two waters - so that your cooling liquid remains pure.
Which is the more expensive system? If you follow the furnace manufacturer's recommendations, be prepared to replace the water chiller. Without corrosion inhibitors, we get approximately 5 years life on our water chillers.
Simply add sodium borate , "three in one" agent - biocide, water softener and corrosion inhibitor :-)
http://www.borax.com/docs/product_pdfs_data/pds-borates-boraxdecahydrate-us.pdf
Borax can indeed be an excellent option, as it can be a scavenger of calcium and is not supposed to precipitate and to lead to hard deposit in the system because of its high solubility. Thank you so much for the good idea.
Alain
As first guideline, you can add 0.5 mg/dm3 of sodium hexametaphosphate, (NaPO3)6, what should be enough to prevent CaCO3 scaling with water of high calcium content, although somewhat less may be actually needed for the locally available tap water. The pH can be adjusted above 8 (when necessary) to further prevent scaling caused by Fe or Mn oxides, what might be otherwise possible if O2 or Cl2 are dissolved in the cooling water.
hi, i have some question,is the Reverse Osmosis (RO) water is suitable for induction furnace.
You should be aware that induction heaters often rely on the insulation ability of the coolant. Perhaps not yours, given the high conductivity spec, but others should beware. Any kind of ionic additive may cause high rates of corrosion. There is a band of conductivity rather than a max because overly low mineral content may also promote corrosion. The wetted electrified surfaces in induction heaters are usually copper, perhaps also aluminum and brass. AFAICT borax is only only a corrosion inhibitor for ferrous metals. A typical recommendation is to use plain ethylene glycol and distilled water 1:1. Do *not* use automotive antifreeze, tubes will clog with "black gunk". It seems biocide is not needed, perhaps because of the copper.
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