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Posted by Joe on May 13, 2008, 9:29 am
Please log in for more thread options On Mon, 12 May 2008 20:02:12 -0400, Brian Lawson
>Hey Michael,
>
>Short answer is yes. But it depends a lot on exactly what it is you
>are doing, but the following is a guide line and used when building
>model locomotive boilers of copper, after all the joints are done.
>
>"To help clean the piece after soldering, it is quenched in "pickle",
>a moderately strong sulfuric acid bath, or a pretty concentrated
>solution of sodium bisulfate. Hydrochloric (muriatic) acid is better
>for copper and brass. (Platter's call it "bright dip".)
Question: Why do they recommend sulfuric or sodium bisulfate first, if
muriatic is the preferred pickle? I'm not trying to be difficult,
mostly just curious as to what other materials model loco builders
might use for boilers.
Also, does the pickle work fine at room temperature?
Joe
>Use two
>containers, one for the pickle, the other for rinse water. Pickle will
>eat holes in cotton and other vegetable fibers, and it can splash when
>a hot piece is dropped into it. Wear an apron. Don't pick up a piece
>in the pickle with iron tongs. Some dissolved copper will plate onto
>the silver because of the galvanic action. Copper tongs are standard;
>stainless steel might work. A hook of copper wire might suffice, and
>don't hesitate to use your bare hands/ fingers if you have no broken
>skin. "
>
>I don't advise the latter, just in case!! Acid burns can easily go
>right to the bone, as with lye also.
>
>Take care. Brian Lawson,
>Bothwell, Ontario.
>
>ps...whatcha makin ??
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>solder flow I had to apply heat directly to the part of one component that
>will later be visible. It ended up covered with black gunk. Is this what
>they call firescale?
>
>I tried removing it with steel wool with only partial success. In the end a
>judicial application of 400 grit sandpaper did the trick without
>obliterating the pattern underneath.
>
>If this is firescale I understand Sparex (sodium bisulphate) is the thing to
>clean it. Am I correct?
>
>--
>Michael Koblic,
>Campbell River, BC
>
>