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Патент USA US2128523

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Patented Aug. 30,1938
umrsp '_ STATES PAT
oFFi-cs' I
2.128.523 I
.
comosmou FOR USE’IN PREVENTION OF -
CORROSION 0F METAL SURFACES
Arthur w. Burwell, ‘Niagal-a Falls, N. 21, assignor
to Alox Corporation,k
poration of New Yor New"__York, N.'Y.', a cor
,
No'prawinz. Application June 29,1936,
'
Serial m». 88,058
~
~
._
{Claima
. ‘This invention ..relates to methods for the pro- . fcilse-u
tection of corrodible metal surfaces against c0r-.
mama, and is concernedwmore particularly with
,
.
,
-_
.
,,
moist air containing-halogen lacids, salt spray
solutions, nitric acid, aqueous, nitric acid, mix; \
, adapted for,
sunshine. .Exposures of metal,
rived from petroleum, shalei oil, _
hydrocarbonaceous starting materials such as tar
e. g., iron and steekssurfa e's, so protected, for
periods of over two weeks, to aqueous nitric acid
> oils from the low temperature coking of‘ coal.__ have had no effect on the films and no corrosive
lignite, etc.
_
10
.en'ect on the metal "surfaces. Likewise, the ?lms
’
- I have found that the rusting- of exposed sur
have been found to be impenetrable b'y alternate
faces of iron and steel articles may for a longer . . sprays of‘ caustic and carbonate’ dust with inter.
period be prevented by application thereto, by
spraying.
15 like,
mediate washing with water. ‘Salts dried on. such
have
enfound to have .no e?'ect in pene
trating‘the'same to cause corrosion ofjthe under
lying metal. _
drums exposed in'the
neighborhood of escaping gaseous chlorine, salts
sprays containing high percentages of‘caustic
soda. caustic soda dust from caustic melting pots,
'20
slveet, snow,
sunshine-all combined-have had '
no effect upon the illrnsi the drums remaining
exactly of the ‘same appearance as when exposed 20'
Filmsof the partia y oxidized petroleum hy
drocarbon products e, in‘ general, very thin;
particularly when applied in solution form and
the solvent thereafter
all of which are,
'
v
v
so "
_
two or more thereof, theoxidatio'n being effected
by blowing air or other oxygen-containing, gas
(e. g., oxygen-enriched air) through .a- liquid body
of the petroleum’ hydrocarbon mixture main
tained ‘at a temperature above at least 100? 0. 35
stronger protective films are desired, I may and l and notv greater than about 185°
superatmospheric pressure of from
frequently do associate with the partially oxidized
petroleum hydrocarbon products one or more
thickening-solidifying or strengthening agents,
40
such, for instancepas rosin, rosin oil, drying oils,
and in the
-> e process above de- '
\_ scribed is that disclosed in Patent Nos. 1,690,768
and 1,690,769, granted to Arthur W? Burwell.
petroleum products
ployed therewith and (2) substantially chemical- . I The resulting ‘reaction product is a mixture of’ a
ly inert to the metal. Thereby} enhance the
great number of different compounds which may,
protective qualitiesxofmy anti-corrosion agents
for clarity,ibe.grouped thus:
U against the hazards of rough handling of the ar
‘ ticles protected therewith.
‘.
_
The aforesaid
.
_ exhaustively _
nl'ms have been’v
"testedbyme and by
agovernmental agency. and
have been found to be e?lcaciouslin the protec
. tionoi' iron and
'
' '
'
1. Unoxidized (i. e., “oz-iginal”) hydrocarbons; '
2. Aliphatic alcohols, largely secondaryv and
.tertiary;'
-
'
50
3. Aliphatic ketones;
'
4. Ketc-alcohols;
'
5. High molecular weight saturated aliphatic y
steel surfaces against moisture, carboxylic
and hydroxycarboxylic acids; etc.; and
araaeas
2
suitable solvents and sprayed upon-the surfaces -
6. Neutral esters and lactones derived from the
aforesaid acids and the aforesaid alcohols, or
from the aforesaid acids, respectively.
Differently grouped, the mixtures are separable
broadly into (a) saponi?ables and (b) unsapon
or otherwise applied.
The invention will be described with greater I
particularity with reference to the following fur
ther illustrative examples of compositions coming
within the concept of this invention:
i?ables: into the latter group fall the alcoholic
and ketonic compounds aforesaid (and, of course,
the unoxidized hydrocarbons), whereas the acids,
esters and lactones. are grouped as saponifiables.
Any and all of the aforesaid oxidized petroleum
‘hydrocarbon products, I have found, have to
Example I
'
,
Parts by. weight
The aforesaid neutral unsaponi?able bodies
from para?n vwax_____' ________ _-_____.. 20-35
Rosin __________________________ _-_ ____ .._ 20-5
some extent the property of arresting the corro
sion of iron and steel surfaces. However, I,
prefer to select as the base of the anti-corrosion
composition one or more of the neutral types'of
Stoddard solvent _________ __, ____ __-___..__
60
Example '1
Parts by weight
The aforesaid neutral unsaponifiablebodies
oxidized products,-i. e.; the neutral, unsaponiii
able, alcoholic, ketonic and/or keto alcoholic
compounds, because they do not offer the possi
from paramn wax ___________________ __ 5-20
Tung oil _____________________________ __ 95-80
The above may be used warm, or diluted with 20
bility of soap decomposition and, moreover, be
cause they in general yield tougher, harder anti
corrosion ?lms than .do the acids or salts and
esters of those acids. In this connection I note
a suitable quantity of thinner or solvent.
Example 111
that I prefer toremploy in the present relation
-‘
the'unsaponi?able partial oxidation products ob
_
.
Parts by weight
25'
The aforesaid neutral unsaponifiable
tained from ceresin or from higher melting point
bodies from a mixture of parai'?n and
petrolatums, since theseiyield tougher films,
amorphous waxes__..-____; _________ __
5-25
which films apparently fin'dergo a progressive. Rosin (or rosin hardened with lime) ____'_
15-5
toughening apparently akin to the toughening of ' Linseed oil, to make__‘_'__'_ _________ __
100
have found to be»
80
?lms of drying oils. Thus, 1
This
may
be
applied
in
undiluted
state,
or
may
particularly advantageous the unsaponiflable '
have thinner added.
neutral bodies separated from the reaction prod
uct obtained by oxidizing (in the manner above
Example N
described) a mixture of amorphous wax and par
Parts by weight i
af?n wax.
.
The aforesaid neutral unsaponifiable
‘
As stated above, these neutral mixtures may
be applied, as such, to the metal surfaces to be
bodies from a mixture of paraffin and
protected, the normally solid products being for.
this purpose heated to above their melting points.
In lieu thereof I may employ a solution of the
amorphous waxes _________________ -_,_
0.5-5.0
Rosin oil ____________________________ _-
2040
Example V
vent, e. g., a light petroleum distillate such as
gasoline or the special petroleum distillate known
,L
as Stoddard solvent. Thus, Inlay, use a composi
tion comprising 40%, more or less, of-the afore
The
aforesaid, neutral
to
.
‘
Barts by weight
unsaponi?able
'
v5-2.0
45
Tlmg oil...v ____________ .._..___l _______ __ 95-80
I,
. This composition, ‘which ‘gives an especially
For greater protection against acids (e. g., acid
mists) , Imay and preferably do incorporatewith
tough film, may be applied, as such, in warm
state, or admixed with a suitable'volatile solvent. .60
the ‘unsaponi?able compounds, or in their solu
tions or compositions, an amine such-as an eth
50. ajnol amine (e. g.,_triethanol amine) or other more
Example VI
)
or less volatile amine. Where amines are added,
I prefer to use them in the ratio of the equivalent
of 1 part byweight of triethanol amine to from
20 to 1,000 parts by weight of the aforesaid neu
'
bodies from road wax____- ____ _;. _____ __
said neutral bodies and >60%,\\less or more, of
Stoddard solvent or equivalent.
,
Stoddard solvent, toimake ___________ __i_ 100
neutral mixture in an appropriate organic sol
45
5-35
Triethanolamine _____ a.‘ _____ _; ______ __
\/
Parts by weight
The aforesaid neutral unsaponi?able
bodies from “Sharples” wax ________ __
'
55 tral bodies.
Finely divided iron oxide _______ -3_____ __
5-40" 55
10-5
This latter mixture may, advantage
ously, be used in the upper cylinder parts of
Linseed oil, to make__________________ __ 100
Instead of the iron oxide of the above example >
gines which have been run with gasoline con
ment such, for instance, as lead carbonate/zinc
oxide, lithopone, or the ‘like. Instead of the lin
seed‘ oil, I may employ another drying oil, e. g.,
automotive engines, particularly airplane en-y I may use a substantial amount‘ of another pig
taining tetraethyl lead mixtures,“ which mixtures
60 almost always contain halogen organic com
pounds. These compounds burn in the explosion
‘chamber forming halogen acids which penetrate
the metal parts and cause serious corrosion upon
access of moisture or after the lapse of con
siderable time, especially under conditions of
higher temperature together with moisture.
u
These halogen acids being in the. metarmust be
neutralized by means of some soluble alkali or
soapsof alkali metals’ soluble in the materials
forming the film. In this connection, it is pos
sible to dissolve either sodium or potassium soapsv
of the aforesaid acids in the alcoholic ketonic
bodies described, the whole being then melted
and painted upon the surfaces or dissolved in
75
tung oil.
>
I
'
.
Ewample VI;
The ‘ ' aforesaid
,
neutral. 'u‘nsaponi?able
bodies from ceresin wax______ __‘____,__
0.5-5.0
Triethanolamine ______________ _'-____'___
100
Dichlor diethyl ether, to make ________ __
It is to be understood that in place ‘of the,’
dichlor diethyl ethefi‘another suitable volatile
solvent may be used.
I claim:
9
' »
.
'
-
‘
1. Film-forming protective composition adapt
ed for use on metal surfaces, consisting essentially
4. ‘Film-forming
3
protective composition as de
lined in claim 1,- characterized in thatan amine
-
ketones, aliphatic keto-alcohols and neutral esters
and lactones 01' high molecular weight saturated
aliphatic carboxylic acids, said composition being
10 substantially anhydrous and inert to metal. _
v
' 2. Film-forming protective composition‘ as de
is admixed therein.
5. Film-forming protective composition adapted
for use on metal
surfaces, being an oily solution
oi’ a mixture oi’ neutralunsaponi?able saturated
oxidized hydrocarbons obtained by the liquid
phase partial oxidation or a hydrocarbon
?ned in claim 1, characterized in that the mixture‘
of neutral unsaponi?able oxidized petroleum
hydrocarbons is dissolved in a relatively volatile
15 organic solvent therei'or.
-
3. Film-forming protective composition as de
lined in claim 1, characterized in that a ?lm
_ tanning thickening agent is admixed therein.
aa'rmm w’. mmwm.
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