Summary of the most common cooling water additives
Summary of the most common cooling water additives
A
Ad
dd
diittiiv
ve
e
A
Ad
dv
va
an
ntta
ag
ge
ess
D
Diissa
ad
dv
va
an
ntta
ag
ge
ess
Sodium
Sodium
nitrite
nitrite
- good efficiency, if
- good efficiency, if
dosage is controlled
dosage is controlled
carefully
carefully
- small active quantities,
- small active quantities,
0.5
0.5 %
% by
by mass
mass
- cheap
- cheap
- suitable as additive except
- suitable as additive except
in
in air
air cooled
cooled heat
heat ex-
ex-
changers
changers with
with large
large soft
soft
solder
solder surfaces
surfaces
--
toxic
toxic
- risk of spot corrosion when
- risk of spot corrosion when
too
too low
low concentration
concentration
Nitrite
Nitrite
+
+
borate
borate
- no increased risk of
- no increased risk of
corrosion
corrosion
at
at over
over doses
doses
- innocuous for the skin
- innocuous for the skin
- tendency to attack zinc
- tendency to attack zinc
coverings
coverings and
and soft
soft solde-
solde-
rings
rings
--
toxic:
toxic:
lethal dosage 3 - 4 g
lethal dosage 3 - 4 g
solid
solid nitrite
nitrite
- risk of spot corrosion when
- risk of spot corrosion when
too
too
low
low concentration
concentration
Sodium
Sodium
silicate
silicate
- not toxic
- not toxic
- harmless to handle
- harmless to handle
- not active when water
- not active when water
velocity exceeds 2 m/s
velocity exceeds 2 m/s
- commercial products very
- commercial products very
expensive
expensive
- increased risk of corrosion
- increased risk of corrosion
when
when too
too low
low concen-
concen-
tration;
tration; spot
spot corrosion
corrosion
- limited suitability
- limited suitability
Sodium
Sodium
molybdate
molybdate
- not toxic
- not toxic
- harmless to handle
- harmless to handle
- more expensive than toxic
- more expensive than toxic
additives
additives
- increased risk of corrosion,
- increased risk of corrosion,
if
if unsufficently
unsufficently dosed
dosed
- can cause deposit
- can cause deposit
formation
formation
(molybdates
(molybdates can
can collect
collect to
to
ferrous
ferrous sulphates)
sulphates)
Organic
Organic
and inor-
and inor-
canic syn-
canic syn-
ergistic
ergistic
based
based
-
- n
no
ot
t tto
oxxiic
c
-
- m
mo
orre
e e
exxp
pe
en
nssiiv
ve
e tth
ha
an
n
sodium
sodium
nitrite
nitrite and
and molybdate
molybdate
based
based
additives
additives
- big active quantitives by
- big active quantitives by
mass
mass
F
F
u
u
e
e
l
l
,
,
L
L
u
u
b
b
r
r
i
i
c
c
a
a
t
t
i
i
n
n
g
g
O
O
i
i
l
l
,
,
C
C
o
o
o
o
l
l
i
i
n
n
g
g
W
W
a
a
te
te
r
r
3
3
4
4
S
S
G
G
-
-
2
2
0
0
0
0
3
3
0
0
3
3
-
-
0
0
3
3
Содержание 41508
Страница 3: ......
Страница 12: ...Appendix B Welding Precautions 200147...
Страница 22: ...Fuel Lubricating Oil Cooling Water 34SG 200303 03...
Страница 29: ...A Ap pp pe en nd di ix x A A E En nv vi ir ro on nm me en nt ta al l H Ha az za ar rd ds s 2 20 00 03 32 21 1...
Страница 73: ...Maintenance Tools 32 9801...
Страница 115: ...Engine Block with Bearings Cylinder and Oil Sump 34SG 9701...