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’ assignee
As regards the rosin, it has been observed -that
weighing, the strips were washed and wiped clean
a, finely divided product, and preferably one which
has been‘exposed to the air and ylight for an ap
with a soft cloth. After ten days of refluxing, it
was found that carbon tetrachloride containing
0.01 ‘per cent by weight of aniline had caused a.
preciable period of time, is most satisfactory. It
lWould appear that the oxidation product formed
weight loss of 3212 milligrams per square inch of
surface of the copper' strips. Over a similar peri
od, copper strips suspended in the carbon tetra
chloride containing 0.1 per cent by weight of rosin
on the surfaces of the rosin particles Vis extremely
active as an inhibitor in the presence of the
amine. The preferred amine is ani-line, although
other primary aromatic and aliphatic mono-_
showed a weight loss of 30.3 milligrams per square
10 inch of surface.y Copper strips contacted with the
AThe expression “relatively small amount” as
composition containing 0.1 per cent of rosin and .
amines are operable.
.
`
herein employed with respect to the rosin and
0.01 per cent aniline, showed a weight loss of but
11.8 milligrams per square inch'.
position, refersfto amounts not in excess of. 1 per »
A series of y’determinations in which the copper
cent by weight' and preferably those within the 15. strips were removed from the water-carbon tetra
amine present in the. carbon tetrachloride com
ranges indicated in the foregoing paragraphs.
chloride mixture and wiped and weighed at 48- .
The inhibited composition as described is par
ticularly eiîective in minimizing .the corrosion of
copper surfaces contacted therewith. It is to be
understood. however, that the corrosion of other
hour intervals gave the following results:
Table 1
metallic surfaces such as brass,»iron, lead,l tin,
monel, and vvarious. iron and steel alloys by wet
.
carbon tetrachlorideis similarly controlled when ` `
'
I’ercent
Weight loss of copper strips at 2-day in
Percent
the combination of rosin _and amine is employed
by weiî‘llit by wei ht
oi ros
of anil ein the carbon tetrachloride' composition'.
25
The following examples illustrate the inventionl
ter-vals in milligrams pei-‘square inch
surface
.
v
'
f
).
_ 2 days
>
4 days
6 days
8 days
but are not to be construed as limiting:
`
_
EXAMPLE 1
A number of compositions were prepared'in
0
0
698
1,903
1, 819`
_ 0
0.
1,370
`1,290
1,305
30
0.1
O
7.1
0.1
0.
5.5
_
670
82S
1,860
655 _
3.6
455
6.5
`15.2,
which various amounts or" rosin, of aniline. and
of rosin and ',aniline were dispersed in carbon
EXAMPL: 2
tetrachloride. Each oi’ these compositions was
tested to determine corrosion against copper sur 35 In. a similar fashion, other metals MWere substi
faces by suspending copper strips 2.5 inches long, ` tuted for copper and contacted with carbon tet
a 0.5 inch wide, and 0.125 inch thick in a glass >iia’sl:
containing 50` milliliters of the modified carbon
rachloride containing .varying amounts of rosin
' and aniline in the presence of water. -Tiie Ioi- /
tetrachloride and. 30 milliliters of water. The
lowing table sets forth representative data as ob
strips 'were so positioned that one-’third of each 40 tained in this determination:
Table 2
_
I'
Weight loss oi’ .metal strips at 2-day 'intervals in
Percent .Pmä’nt
y
weight
:leggi:
of msm
line
vo. 5
l o’
'
_
^
0 ‘
0. 5
0. 5
0. 1
0. 1
l0
0. 01 ’
>0
0.
,
4 days
22
94
21. 2
15. 5
48
31. 5
11. 0
1. 1
1. 0-
1. 4
1. 4
1.0
0.7
1. c
1. a
0.5
0.1
0.4
0.4
0
0
0.*2
0.1 _
0.0_1
0
0
0.1
0.01
'0
f
_
.--__ o _________ _.
o
0.5
0.1
'
`
341
1.3
»f
0
0.8
'14.6
37
23. 7
8. 3
56
31.1
11. 2
_1. 5
1. 3
1.0
1.0
'
0.8
0.7
2. i
1.6
0.3`
0.38
9.3
5.0 '
0.1
0.4
0.2
8. 7
18. 4
20. 8
5l. 6
89. 3 `
`
37. 8
11.1
17.6
11.8
12.6 '
16.2
‘
13.8
Cäst ,;'Ever~
1,105
_dn
1,122
'843
0
1 1,061
-
291
Galvanized iron.
.___-do _________ __
A
i 293
340 .
' 1. e
0.3
" 3.
288
0.6
_ 0.6
468
1_12
4.4
'
___.. 0-_--_‘__‘_--..
ur.
o. s
1.0
0.7
'
c
eacgeîf'oëour '
. 25s
2.1
289
57
27. 0
12. 9
312
grange ¿erh
lost during _
10 days
155
3.3
311
44
51
8. 5
3. 0
o
121
2.3
0.8
' 0.7
_
~ 6 days ' 8 days
231
Avera e milli
square
`
4.2
344
0
d ‘0
u
.
4. 2
"
- 0.1
0.01
0.1
'
'
l0.1
0
l
2 days
0-
o. 5
~.
.
Meu#
0.5
0.5
0.1
~
milligrams per square inch surface
`
~-0.1
0.07
...... -`..-
1,025
'
7. 2
3.5
1, 182
11.6'
1 1, 11o
3.5
'
1
76s '
’
6.2
l Metal strips corroded through.
, was in the -carbon tetrachloride. one-third in the v
EXAMPLE 3
water, and one-third above the liquid in the ilask. 7
Each'such iiask was equipped with .a reilux con
Likewise, _a ¿number of l representative primary
denser. Eaclrñask and contents was then heated
monoamines were substituted for aniline in mix
_ to boiling temperature and the copper strips ex
ture with-resin and carbon tetrachloride. Here
amined and weighed at regular intervals to ascer-.
again copper strips were employed in contact with
tain the degree of corrosion resulting. Prior t0
_a hot .mixture of water andthe Èvarious carbonl
therewith, which comprises-dissolving in the car=
bon tetrachloride at least 0.1 per cent by weight
tetrachloride compositions. The îollowing date
is representative of that obtained:
'
Table 3
Wgïht lum o! oo per strips at
Femm
Panam
I
by wel t by weight
ci
t» 1 v
Nature o1 amine
' oi amine
(
-
0. 5
0. 5
n
sy intervals
milli
per “um m "t mmm
f
2 days 4 days 0 days 8 days
0. 1
` 0. 1
N-butyl-amlno ...... _Pam-anisìd
....-..--
13. 1
6. 7
4. 6
9. 0
5. B
6. 0
0. 5
0. 1
Isoemylamine ....... _.
l2. 8
10. 2
4. 7
3. 6;
3. 7
3. 0
0. 5
0. l
Monoethnnolamine..-
3.2
_ 1.0 '
1.0
3. 2
_Other primary mono-amines may be employed- l5 of resinv and from 0.001 to 0.1 per cent by weight
in combination with rosin to accomplish the pro
cedure of the present invention and to obtain
of a primary mono-amine.
'
` v
3. A composition of matter-comprising carbon
tetrachloride containing at least 0.1 per cent by
the desired4` carbon tetrachloride compositions. ’
weight of rosin and'from y0.001 to 0.1 per cent by
_ Representative' of such compounds are allyl
amine, normal-propyl-amine, pentenyl-amlne, 20 weight of a primary mono-amine.
4. A composition of matter comprising carbon
normal-hem'I-amine', normal-octyl-amine, nor- î
mal-dodecyl;` hexadecenyl- amine, para- .f tetrachloride containing'between 0.1 and 1.0 per
cent by weight of rosin and from 0.001 to 0.1 per
ethyl-amine, 4-tertiary-buty1- enum-e, .2,4 - da
cent by weight of aniline.
methyl-anillne, orthœtoluidine, para-toluidine,
5. 'Atmethod 'of inhibiting the corrosion of met- .
4 - amino' - 'diphenyh
mono -- cyclohexyl - amine, 25
nwno-isopropanol-amine, glycine ethylester, ben- _ als by wet carbon tetrachloride in contact there
with which comprises dissolving in the carbon tet
. zal-amine, etc.
« rachloride at least 0.1 percent by weight of resin
I claim:
I
'
_
and at least 0.001 percent by weight-of a. primary
e 1. A method of inhibiting the corrosion of met
alsby carbon tetrachloride in contact therewith,
30 mono-amine.
and from 0.001 to 0.1 per cent by weight of ani'- _
line.
.
'
6. A composition of matter comprising carbon
tetrachloride having dissolved therein at least
0.1 percent by weightv of rosin and` at least 0.001
which comprises dissolving in the carbon tetra
chloride at least 0.1 per cent by weight of rosin
' percent by weight of a primary mono-amine.
-
2. A method of inhibiting the corrosion of 35
. metals by wet carbon tetrachloride in contact
ìmwmno.
fr c
»
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