TB 43-0213
wetting agent. This compound does not contain a grease
a. As a component of low temperature bichromate
finish solution for ferrous metals.
solvent because it is a de-ruster for parts that have been
precleaned.
b. As a molten bath to produce black finish on
corrosion resisting steel.
b. This compound is used to remove rust from
precleaned metal parts.
c. As a component of a chromate pickle solution
used to clean traces of flux from magnesium alloy items
after gas welding.
2-25. Corrosion
Removing Compound:
d. As a component of a chromate pickle bath for
Metal Conditioner and Rust Remover,
treating magnesium alloy sand mold, permanent mold,
Wash-off
(MIL-M-10578A,
Type
and die castings and wrought magnesium alloy parts to
protect them against corrosion (see MIL-M-3171A).
Type l).
e. As a component of a chrome pickle solution for
treatment of magnesium alloy parts before painting (see
WARNING
MIL-M-3171A).
f. As a component of a galvanic anodizing solution
When diluting the compound, pour the
that is used in Type IV treatment of magnesium alloy
compound into the water. Do not pour water
parts before painting (see MIL-M-3171A).
phosphide), a colorless, poisonous gas,
g. As a component of a neutralizing bath for
forms very readily when any mineral acid
treating magnesium alloy parts after Type V corrosion
reacts with metals or alloys containing
protective treatment and before painting.
phosphorus. Since this gas is a dangerous
fire, explosive, and toxic hazard, adequate
Removing Compound:
2-27. Corrosion
ventilation must be provided. The amount
Metal Conditioner and Rust Remover,
of phosphine released from the acid bath
increases with an increase in temperature
(MIL-M-10578A,
Wipe-off
Type
and concentration of acid. Compound
Type II).
contains a strong acid. Operators should
wear protective clothing and glasses when
WARNING
making up or using this compound. If
splashed on skin or eyes, flush immediately
Pour the compound into the water. Do not
and thoroughly with water for at least
pour the water into the compound. Phos-
20 minutes. Get medical attention. Avoid
phine, (hydrogen phosphide), a colorless,
prolonged breathing of vapors.
poisonous gas, forms very readily when any
mineral acid reacts with metal or alloys
CAUTION
containing phosphorus. Since this gas is a
dangerous fire, explosive, and toxic hazard,
Do not use this compound on electrical
adequate ventilation must be provided.
wiring, coil steel springs, or other spring
steels.
CAUTION
Do not apply this cleaner to electrical
a. This compound is a concentrated, homogeneous,
wiring, steel coil springs, or other spring
stable liquid, containing free orthophosphoric acid and
steel. The treated surfaces must be painted
water soluble, nontoxic, organic grease solvents.
or coated with corrosion preventive com-
b. This compound is used to remove rust and grease
pound as soon as possible.
from ferrous metal surfaces, and provides a slight
a. This compound is a dilute solution of orthophos-
etching action for ferrous and nonferrous metals to
phoric acid and water soluble, organic, nontoxic, grease
promote the adhesion of paint or corrosive preventives.
solvents. The acid is in lesser proportion and the grease
solvents in greater proportion than in the wash-off type.
2-26. Sodium Bichromate, Dihydrate: Tech-
b. It is used to remove light or medium grease and
nical, Granular (O-S-595).
rust deposits from ferrous metals, or to condition
ferrous, galvanized, brass, or aluminum surfaces for
This compound consists of red crystals that are
painting. The remaining film of gray-white iron
phosphate conditions the surface for paint.
soluble in water. It is used in the following applications:
2-14