TM 1-1500-204-23-8
is directly over entire seam and kept in order to maintain
an even temperature.
c. Post Brazing and Silver Soldering. Clean brazed or
soldered joint of flux using the following procedures:
_________
WARNING
Hydrochloric acid is highly toxic and
corrosive. Goggles, rubber gloves, and
rubber aprons should be worn when
handling the acid and the acid solution. Do
not inhale gases and mists. When spilled
on the body or clothing, wash immediately
with large quantities of cold water, and
seek medical help. Do not pour water into
acid when preparing the solution; instead,
pour acid into water. Always mix acid and
water slowly. Perform cleaning operations
only in well- ventilated areas. Otherwise,
death or injury may result.
(1) Remove flux from nonferrous metals by treating
with a solution of one ounce of sulfuric acid, Federal
Specification O-S-809, and 1.5 ounces of sodium
bichromate, Federal Specification O-S-595, added to one
gallon of water.
(2)
Remove flux from ferrous metals by
boiling for 30 minutes in a 10 to 15 percent solution of
caustic soda, Federal Specification O-C-275.
(3)
Follow either treatment with a thorough
rinse in clean water.
(4)
Remove
discoloration
caused
by
immersing the part in a solution of 68 ounces of sulfuric
acid, Federal Specification O-S-809; 20 ounces of nitric
acid,
Federal
Specification
O-N-350;
1
ounce
of
hydrochloric acid, Federal Specification O-H-765; and 40
ounces of water. Rinse in clean running water.
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