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Posted by D Sherman on Saturday, August 30, 2008 at 12:35:42 :
In Reply to: Die cast is seldom aluminum.... posted by chriscase on Saturday, August 30, 2008 at 12:06:16 :
I agree. I don't know exactly what they use on carburetors versus antique radio parts, but they're clearly different allows since carb castings don't grow over time. I once made some zinc chloride flux for soldering by dissolving a some scrap die castings in hydrochloric acid. They turned out to be almost pure zinc. Maybe I should put a few aside and check them 70 years from now to see if they've grown and cracked.
For proper flux for pure zinc, I would think zinc chloride would work, since that's what's used on galvanized sheet metal. The problem is that any aluminum in the alloy forms an oxide layer that's usually good in that it protects the metal, but it's impossible to solder through. Still, even if you could get tin/lead solder to stick to the casting, it wouldn't be hard enough to machine new threads and a seat into.