This soldering acid may be used on any metal to be soldered by applying
with a brush or swab. For electrical work, this acid should be made neutral
by the addition of one part ammonia and one part water to each three parts
of the acid. This neutralized flux will not corrode metal as will the
ordinary acid.
Powdered resin makes a good flux for lead, tin plate, galvanized iron and
aluminum. Tallow, olive oil, beeswax and vaseline are also used for this
purpose. Muriatic acid may be used for zinc or galvanized iron without the
addition of the zinc, as described in making zinc chloride. The addition of
two heaping teaspoonfuls of sal ammoniac to each pint of the chloride of
zinc is sometimes found to improve its action.
_Soldering Metal Parts._--All surfaces to be joined should be fitted
to each other as accurately as possible and then thoroughly cleaned with a
file, emery cloth, scratch bush or by dipping in lye. Work may be cleaned
by dipping it into nitric acid which has been diluted with an equal volume
of water. The work should be heated as hot as possible without danger of
melting, as this causes the solder to flow better and secure a much better
hold on the surfaces. Hard solder gives better results than half and half,
but is more difficult to work. It is very important that the soldering iron
be kept at a high heat during all work, otherwise the solder will only
stick to the surfaces and will not join with them.
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