CA1041284A

CA1041284A - Filming amine emulsions

Info

Publication number: CA1041284A
Application number: CA212,479A
Authority: CA
Inventors: Jerry L. Walker; Thomas E. Cornelius (Iii)
Original assignee: Calgon Corp
Current assignee: Calgon Corp
Priority date: 1973-11-05
Filing date: 1974-10-29
Publication date: 1978-10-31
Also published as: JPS5075653A; AU7352974A; US3860430A

Abstract

ABSTRACT OF THE DISCLOSURE
Filming amine emulsions employing polyoxyalkylene-containing tertiary amines are used to protect metal piping and apparatus which are subject to corrosive attack by aqueous media which is being transported or with which they are other-wise in contact. The corrosion-inhibiting composition com-prises an aliphatic film-forming amine, water, and a poly-oxyalkylene-containing tertiary amine dispersing agent represented by the formula:

Description

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28~L
l BACKGROUND OF THE INVENTION

2 Field of the Invention

3 This invention relates to methods and compositions

4 for inhibiting the corrosion of metal components which are contacted by aqueous fluids~ It particularly concerns the 6 use of filming amine emulsions employing polyoxyalkylene 7 containing tertiary amines to protect metal piping and 8 apparatus which are subject to corros;ve attack by the aqueous 9 media which is being transported or with which they are other-wise in contac~. A wide variety of systems employ aqueous ll fluids for various industrial and commercial purposes and 12 include, among others, steam turbine systems, boiler systems, 13 steam condensate return systems, steam distribution systems, 14 heat transfer water systems, evaporator systems, processing water systems, wet pipe fire systems, cooling water systems, 16 and so forth.
17 Reference herein to metal and metal components and 18 apparatus is intended to inc1ude ferrous materials and alloys, 19 nsn-ferrous materials and alloys such as those based on copper and nickel, and so forth; and various structures su~h 21 as pipes, tanks, fittings, valves, traps, heat exchangers, 22 deaerators, and similar devices.
23 While the description of the invention concerns 24 itself primarily with corrosion of metal components produced by contact of the metal surfaces with steam and steam conden-26 sate, the methods and compositions of this invention also 27 find useful application generally to inhibiting corrosion 28 of metal surfaces contacted by corrosive aqueous fluids 29 which are transported, circulated and contalned within the metal components. Nevertheless, the methods and compositlons ~ 8 4 1 of the invention have proven especially beneficial in steam 2 and steam condensate systems where it is desired to keep 3 additives to the system at a minimum, since corrosion in-4 hibiting results are reali~ed in this environment when using only extremely small quantities of the compQsitisns of this 6 invention.
7 The corrosion which is experienced by metal exposed 8 to aqueous fluids, particularly steam and steam condensate, 9 is apparently due in large measure to carbon dioxide and oxygen dissolved or otherwise entrained in the aqueous fluid.
: 11 However, the corrosiYe action may also be caused by ammonia, 12 hydrogen sulfide, sulfur dioxide~ or other substances present 13 in the aqueous fluid in gas, liquid; or Yapor form; or by the 14 aqueous fluid itself; or by a combination of any of these.
~ , Description_of the Prior Art 16 The use of aliphatic amines to inh~bit the 17: corrosion o~ metal and metal somponents taking place under 18 ~the conditions described above is well known in the art.
19 U. 5. Patent 2,460,259 discloses deposition of a protective~
substant~ally mono-nuclear film of a corrosion inhibiting 21 substance comprising, among other materials, high molecular 22 weight amines, particularly octadecylamine. Wh~le these 23 aliphatic amlnes provide adequate protection against corrosion 24 for metal surfaces on which they are actually coated, they have confronted the art with a number of problems. For 26 example, aliphatic amines satisfactory for corrosionin~b~n 27 are also sollds at room temperature, thus requiring ~a~
28 tion to a liquid form to be usable. Proper u~ilization re-29 guires that the composition be accurately metered to and G

2~4 l and dispersed within the system to be treatedO However, the 2 aliphatic amines useful for corrosion inhibition are also 3 nearly water insoluble. Thus, it has been conventional to 4 prepare compositions containing salts of aliphatic amines which are more water soluble than the amines themselves.
6 U. S. Patent 2,712,531~ discloses the use of a blend of 7 octadecylamine and octadecylamine acetate as ~ corrosion 8 inhib~tor. U. S. Patent 2J767,106 discloses the use of an 9 aliphatic amine glycolate, either alone or in combination lO Iwith an aliphatic amine, as a corrosion inhibitor. It has ll also been conventional to prepare dilute aqueous dispersions 12 of aliphatic amines by combining them with dispersing aids 13 or emulsifiers. U. S. Patent 2,649"415 discloses the use of 14 polyalkoxylated derivatives of monocarboxylic acids, mono-hydr~c alcohols, and of alkylphenols as non-ionic dispersing 16 agents for aiiphatic amine corrosion inhibitors. U.S. Pater.t 17 No. 27956,889 discloses a corrosion inhlbitor comprlsing an 18~ aqueous emulsion of an aliphatic amine which is stabil~zed by l9 the presence of a water-soluble condensate of at least 5 moles 20 of ethylene oxide with a high mole~ular weight aliphatic amine.
21 U.S. Patent No. 3,088,796 discloses the use of polyoxyethylene 22 tertiary am~ne and quaternary ammonium chloride compounds as 23 em~lsifiers for film forming aliphatic amines to produce 24 corros~on inh1biting compositions. U.S. Patent No. 3~239,470 discloses the comb7nation of a pr~mary aliphatic amine, an 26 ethoxylated amine condensate, and a phenolic lignin sulfonate 27 used as a corrosion inhibitor. U.S. Patent ~o. 39418,253 28 d~scloses the use of an aqueous dispersion of a straight chain 29 pr~mary amine emulsified with a polyethoxylated long chain C-9~2 ,_ ~

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1 amide as a corrosion inhibitor. U.S. Pat.ent No. 39418,254 2 discloses the use of an aqueous emulsion of a primary aliphatic 3 amine emulsified by an alkylphenoxy (ethyleneoxy) alkanol as a 4 corrosion inhibitor. U.S. Patent No. 3,554,922 dis~loses the use of an aqueous dis~ersion of octadecylamine and a vegetable 6 polysaccharide gum as a corrosion inhibitor. U.S. Patent No.
7 3~717,433 discloses a steam-corrosion inhibition method employ-8 ing a composition comprised of a fatty amine., an isothiouron-9 /~um salt as a cat~onic emulsifier, and an ethoxylated straight chain aliphatic acid as an emulsion stabillzer.
11 In addition to t~e fatty amines described above, 12 other amine compounds have found use as corrosion inhibitors.
13 U.S. Patent Nos. 3,029,125 and 3,378,581 discloses the use of 14 alkoxylated alkylene diamines and their aliphatic carboxylic 15 acid salts as corrosion inhib~tors. U.S. Patent No. 3,203,904 16 discloses corrosion inhibition with ethoxylated straight long -17 cha~n am~nes emulsified by ethoxylated quaternary ammonium ~: 18 chloride salts;
~ .
~ 19 SUMMARY OF THE INVENTION
, ~
~ It is an object o~ this invention to provide a method 21 and ~compos~tion for inhibiting the corroslon of metal surfaces 22 exposed to corrosive aqueous fluids.
23 It is a further object of this invention to provide 24 a corrosion inhibit~ng composition which permits preparat~on of feed solu~ions having from 0.1% act~ve amine up to any 26 practical maximum concentration.
27 Another objec~ of this ~nvention is to provide a 28 corrosion inhibiting compo.sition which is very fluid at room ~ Z~ 4 1 tempera~ure, thus allowing easy introduction into the system 2 to be treated.
3 Another object of this invention is to provide a 4 corrosion inhibiting composi ti on havi ng excel 1 ent free~e-thaw ~haracteristics.
6 Another object of this ~nvention is to provide a 7 corros~on inhibiting composition having incorporated therein, 8 ~n add~tion to an aliphatic amine, a neutral~zing amine.
9 Another object of this invention is to provide a corrosion inhibiting composition which is solid, preferably 11 an extruded solid, consîsting of a blend of all ingredients 12 requ~red to permit dinect feeding, or requiring only dilution 13 with water ~o the desired concentra~ion before feeding to the 14 system to be treated.
- It ~s another object of this invention to provide a 16 corrosion inhibiting composition whlch employs emulsifiers 17 which are themselves film-fonming materials that aid in cor-18~ rosion inhibition.
19 : Other objects of this invention will become apparent from the additional description of the invention set ou~ here~
21 in. howeYer, it ls intended that the description of the in-22 vention should not l~mit the invention, but merely indicate 23 the preferred embodiments thereof, since various modifications 24 within the scope bf th~s invention will become apparent to 2$ ~hose skilled in the art.

~7 The fi~m-forming amines useful in this invention are 28 generally the fatty amines and this ~s ~ntended to include -~5--, - ' c-962 Z~ ' 1 saturated n-alkyl amines containing 10 to 22 carbon atoms;
2 unsa~urated n-alkyl amines containing 10 to 22 carbon atoms, 3 but with 1 or 2 unsaturated moieties present in the carbon 4 atom chain, the remainder being saturated; branched alkyl amines containing 10- 22 carbon atoms; mlxtures of any or all 6 of the above; and hydrogenated mixtures of any of the above 7 unsaturated amines. Useful fatty amines include, among otherss 8 dodecylamine; tetradecylam~ne; hexadecylamine; octadecylamine;
9 tallow amines and hydrogenated tallow amines. The preferred fatty amines for use in this invention are octadecylamine, 11 tallow amine and hydrogena~ed tallow amine. The aliphatic 12 film-forming amine may be contained in the compositions of 13 this invention in an amount of from about 1% by weight to 14 about 90% by weight, and preferably from about 1% by weight to about 15X by weight.
16 In addition to the aliphat~c film-forming amines 17 described, this ~nvention also contemplates the use of various 18 known salts of the aliphatic am;nes described. Such known 1~ salts include the glycglate and acetate salts of various ali-phatic amines. The use of the acetate salts of the aliphatic 21 amines described herein is especially preferred for the com-22 positions and methods of this invention. These salts of the 23 al~phatic film-forming amines may be used in the compositions 24 of this invent~on ~n an amount of from about 0.1% by weight to about 50% by weight, preferably from about 0.5% by weight to 26 about 10% by weight.
27 Neutralizing amines are known in the art and function 28 as corrosion inhibitors by neutralizing carbonic acid present 29 in water and steam systems as the result of dissolved carbon 1 dioxide. Any o~her acids presen~ ~o4uld also be neutralized.
2 They are employed in the methods and composit;ons of this 3 invention along with fatty film-forming amines and the poly-4 oxyalkylene containing tertiary amines of this invention to give improved corrosion inhibition. Examples oF neutralizing 6 amines known in the art are cyclohexylamine, morpholine and 7 diethylaminoethanol (DEAE). Of these, diethylaminoethanol 8 is especially preferred for use with the methods and composi-9 tions of th;s inve,ntion. The neutralizing amine may be con-tained in the compositions of this invention in an amount of 11 from about 1% by weight toi about 50~ by weight, preferably 12 from about 1% by ~eight to about 20% by weight.
13 The polyoxyalkylene-containing tertiary amines 14 useful in this invention may be represented by the formula:

~
16 Rl- N ( R30 ~ H

17 wherein Rl and R2 are aliphatic hydrocarbon radicals having 18 from 12 to 20 carbon a~oms, which can be the same or different;
19 and wherein R30 is a polyoxyalkylene chain of randomly distri-buted oxyalkylene units, the total of these units in the chain 21 being n, which is an integer of 3 to 100 and preferably 5 to 22 50, said polyoxyalkylene chain consisting of randomly distri-23 buted oxyethylene and oxypropylene uni~s in a ratio of from 24 1 10 to lO:l,'respectively.
Polyoxyalkylene-containing tertiary amines of this 26 type are described in U.S. Patent No. 3,456,013.

28 Such polyoxyalkylene-conta;n;ng tertiary am;nes are c-962 ~L~4~
1 condensation products of a secondary mono-amine containing 2 two aliphatic hydrocarbon radicals with a mixture of ethylene 3 oxide and propylene oxide. The different oxyalkylene groups 4 are distributed randomly throughout the oxyalkylene chain and the oxyalkylene chain itself may vary in length. While this 6 results in a varying structure, the compounds produced are 7 characterized by the average length of the polyoxyalkylene 8 chain and the average ratio of oxyethylene units to oxypropyl-9 ene units in the polyoxyalkylene chain. Several particular polyoxyalkylene-containing tertiary amines were used in prepar-11 ing formulations according~to this invention, as will be des-12 cribed later. These tertiary amines contain 5~ 10, 15, 20~ 30 1~ and 50 moles of polyoxyalkylene per mole of khe tallow amine 14 component of the tertiary amine, and are designated EO/PO
(for ethylene oxide/propylene oxide) 5, 10, 15, 20, 30 and 5 16 respectively. The tert~iary amine will be present in the com-17 positions of this invention in an amount of from about O.lX by 18 we~ght to about~lO.OX by weight, preferably in an amount from 19 about 0.2% by weight to about 5.0% by weight.
This invention contemplates the use of the polyoxy-21 alkylene-containing tertiary amines just described with ali-22 phatic film-forming amines and water to produce what is, in 23 effect, an emulsifiable concentrate. That is, the mixture is 24 an emulsion which is suitable to be diluted to any desired concentration and then fed directly to the system to be treated.
26 This invention further contemplates the use of one or more ~7 salts of an aliphatic film-forming amine, which are more water 28 soluble than the amine itself, along with the mixture of the 29 film-forming amine and polyoxyalkylene-containing tert~ary am~ne as described above. These salts of aliphatic film-, c-962 ~ 2~ 4 1 forming amines are well known in the art and include, for 2 example, the acetate and glycolate salts of various al;phatic 3 film-forming amines. In this invention the use of tallow amine 4 acetate is particularly preferred. This invention also con-templates the use of a neutralizing amine along with the mix-6 ture of the aliphatic film-forming amine and the polyoxyalkyl-7 ene-containing tertiary amine described above. In this inven-8 tion the use of diethylaminoethanol (DEAE) is particularly 9 preferred. These various aspects of this invention will now be further described by way of illustrative examples which 11 disclose the preparation OJ~ representative formulations that 12 may be utilized in accordance with the teachings of the pres-13 ent invention.

The fol10wing ingredients were m;xed together:
16 In~redien~ Amount (grams~ % by Wei~ht 17 Armeen~HT ~ . 30 15 18 (hydrogenated tallow amine) 19 E0/P0 20 . 4 2 Distilled Water 166 83 21 The mixture was heated to 150 F. and then agitated. The 22 agitation continued while the mixture was removed from the 23 source of heat, and was maintained until the mixture was cold.
24 The finished product was a uniform paste.

EXA~lPLE 2 26 The following ingredients were mixed together:

__g__ ~-9 62 ,~ .

1- Ingredient Amount (grams) ~ by Weight 2 Armeen~HT 25 12.5 3 Adogen~140A
4 ~tallow amine acetate) 5 2.5 E0/P0 20 4 2.0 6 Distilled ~!ater 166 83.0 7 The mixture was not heated, but was simply agitated vigorously.
8 The resultant product was foamy, bu~ fluid. Feed solutions 9 were prepared having 20%, 5% and 1% by weight of solîds con-centrations. These feed solutions were satisfactory for 11 introduction into a system~to be treated.

13 The following ingred;ents were mixed together:
14 Ingredient Amount (~rams) % by Weight Armeen~HT 25 12.5 16 Adogen~140A 5 2.5 17 E0/P0 10 2.5 1.2 18 Distilled Water ~ 167.5 83.8 19 The m;xture was stirred while heating to 160 F. The mixture was then removed ~rom the heat and agitated until cool. The 21 finished product was a uniform paste.

23 The following ingredients were mixed together:
24 Ingredient Amount (grams) X by Weight Armeen~HT 25 12.5 26 Adogen~140A 5 2.5 27 E0/P0 15 5 2.5 28 Distilled Water 16.5 82.5 A~

.

!34 1 The mixture was heated to 160 F. with stirring. The mixture 2 was then removed from the heat and agitated until its tempera-3 ture reached 100 F. The resultant product was thiek but still 4 pourable initially at 100F.

6 The following total amounts of ingredients were used:
7 Ingredient Amount (grams) % by Weight 8 Armeen~HT . 20 , 10 9 Armac~HT
(hydrogenated tallow 11 amine acetate) ~ 10 5 12 E0/P0 20 S 2.5 13 Distilled Water 165 82.~

14 A half gram ~0.5~ of the E0/P0 20, the 20 grams of Armeen~HT, the 10 grams of Armac~HT, and 100 grams of distilled water 16~ were mixed and heated with stirring to 160 F. The mixture 17 was then removed from the heat and agitated until the mixture 18 reached 120 F. Then the remaining 4.5 grams of E0/P0 20 and 19 65 grams of distilled water were added slowly to the mixture while agitati:on was continued. The mixture was very v;scous 21 prior to addition of the remaining E0/P0 20 and distilled 22 water, but with the addition the viscosity was reduced, re-23 sulting in a very fluid, uniform product.

The following total amounts of ingredients were used:
26 Ingredient Amount (~rams) X bv ~eight 27 Armeen~(tallow amine) 20 10 28 Armac~(tallow amine acetate) 10 29 E0/P0 20 0.4 0.2 Distilled Water 169,6 84.8 ----1 1 ---- .

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1 A 0.2 gram amount of the EO/PO 20 was added to 99.8 mls. of 2 distilled water, then the 20 grams of Armeen and 10 grams of 3 Armac were added, and the total mixture was heated with stir-4 ring to 160 F. The mixture was removed from the heat and agitated until it reached 120 F. The agitation was continued 6 while the remaining amounts of the ingredients, 0.2 gram of 7 EO/PO 20 and 69.8 of distilled water, were added slowly to 8 the mixture. The final product was somewhat viscous but 9 still fluid. Feed. solutions of 20%, 5% and 1% by weight of solids content were prepared, and were satisfactory for intro-11 duction into a system to be treated.
12 In the following Examples, the use of a neutraliz-13 ing amine in addition to the aliphatic film-forming amine and 14 polyoxyalkylene-containing tertiary amine is illustrated.

16 The following total amounts of ingredients were 17 used:
18 InQredient - Amount (grams~ X by Weight 19 Armeen HT 10 5 Armac HT 6 3 21 Pennad 150 (DEAE or 22 diethylaminoethanol)36 18 23 ~O/PO 20 1 0.5 24 Distilled Water 147 73~5 One-fourth (0.25 grams) of the EO/PO 20 was admixed with the 26 10 grams of Armeen HT, 6 grams of Armac HT, 36 grams of Pennad 27 150, and one-hal~ (73.5 grams) of the distilled water, and 28 heated with stirring to 160F. The mixture was then caoled 29 while agitating to 120F., at wh~ch time the remaining amounts 1 of ingredients (0.75 gram E0/P0 20 and 73.5 grams distilled 2 water) were added. The agitat;on ~as continued. The result-3 ant product was uniform and very viscousO

The following total amounts of ingredients were 6 used:
7 Ingredient Amount (grams) qO by We;ght 8 / Armeen~HT . 10 4.8 g Armac~HT 2 ~ 1.0 Pennad~150 ~ 36 17.2 11 E0/P0 20 0.6 0.3 12 Disti71ed Water i60 76.7 13 The final product was prepared as in Example 7 and proved to 14 be uniform and viscous.
~' ~

16 The following total amounts of in~redients were 17 use~d: ' 18 Ingredient Amount (grams? % by Weight 19 Armeen~HT 20 10.0 Armao~HT 4 2.0 21 Pennad~150 4 2.0 22 E0/P0 20 1.5 0.8 2-~ Distilled ~ater 170 85.2 24 The final final product was prepared as in Example 7 above9 and proved to be fluid and uniform.

~ ' . . , 2 The following ingredients were mixed together:
3 Ingredients Amount (grams) X by Weight 4 Armeen~HT 25 12~0 Armac~HT 5 2~4 6 Pennad~150 8 3.8 7 E0/P0 ~0 1.8 1.0 8 Distilled Water 168 80.8 9 The mixture was heated with stirring to 160 F. Agitation was continued while the mixture was cooled to 120 F. The final 11 product was uniform and viscous.

. .

13 The following ingredients were mixed together:
14 Ingredients Amount (~rams) % bv Weight lS Adogen~140 3 1.5 16 Pennad~150 15 7.5 .
17 E0/P0 50 2 1.0 18 Distilled Water 80 40.0 19 The mixture was heated to 180 F. with mild agitation. The mixture was then removed from the heat and placed under a 21 Heller mixer and mildly agitated un~il it cooled to room 22 temperature.
23 This invention contemplates use of the corrosion-24 inhibiting compositions described herein in solid form as well as in fluid emulsion form. This solid form may simply 26 be flakes of the corrosion-inhibiting composition produced by 27 evaporating the water content from a thin layer of the fluid 28 emulsion of the corrosion-inhibiting composition containing __74__ ~

1 the desired proportions of components, disposed on any con-2 venient surface. However~ a preferred method of preparing 3 a solid form of the corrosion-inhibiting compositions of this 4 invention is by extrusion of a hot mixture of the components of the corrosion-inhibiting composition, wherein the extrud-6 lng device is cooled suff;ciently to induce solidification 7 of the corrosion-inhibiting composition, which will normally 8 be solid at room temperature. Most conveniently, this is 9 /accomplished during the manufacturing process for aliphatic amines. Immediately following their manufacture, these 11 aliphatic amines will be in a heated condition, and thus 12 liquid. At this point7 the additional components of the 13 corrosion-inhibiting compositions oi this invention can 14 simply be incorporated into the aliphatic amine. Alternative-ly, a hot mixture is prepared simply by adding to the desired 16 amount of the aliphatic film-forming amine maintained at an 17 elevated temperature sufficient to render it fluid, appropri-18 ate quant~ties of the polyox~alkylene-conta;ning tertiary 19 am~ne dispersing agent, and such other of the additional com-ponents o~ the corrosion-inhibit~ng compositions described 21 herein as may be desired. The mixture is agitated to insure 22 uniform dispersion of all of the components. The extrusion 23 itself may be performed with conventional equipment intended 24 for this purpose, according to known extruslon techniques.
The compositions of this invention either already 26 exist as emulsions, or, in the case of the extruded solid 27 compositions~ may be mixed wlth water to produce an emulsion.
28 These emulsions may be diluted with water to form corrosion 29 inhibi~ing compos~tions contain~ng from 1% to 25% by weight of solids.

r 1 The corros;on inhibit;ng compositions of this in-2 vention may be incorporated into the system to be treated in 3 a number of ways. They may be added to a water storage tank, 4 or fed into water being added to such a storage tank, for example. For boiler systems, the compositions of this inven-6 tion may be introduced to condensate receivers, deaerating 7 heaters, boiler feed water lines, directly to the boiler 8 itself, or directly to the steam lines for uniform distribu-9 /tion. Where necessary9 a piston pump capable of exceeding the internal pressure of the boiler may be used. The feeding 11 of the corrosion inhibiting composition may be continuous or 12 at intervals. The corrosion inhibiting composition may be 13 introduced at more than one point, ~nd the treatment may be 14 confined to the water alone, the steam alone, or both may be treated. Desirably, the corrosion-lnhibiting composition is 16~ added in amounts sufficient to maintain a weight of composi-17 ~ion to weight of system aqueous fluid ratio of from about 18 ~O.l to about 100 parts per million. With a dynamic system, 19~ such as a boiler system, the amount added is expressed in 20~ ~terms of pounds of steam produced. Thusl the corrosion-21 inhibiting compositions of this invention would be added to 22 a boiler system in an amount of from about 0.1 to about 100 23 pounds of product per million pounds of steam produced.
24 Once the corrosion-inhibiting composition has been added, it becomes evenly dispersed in the water of the system and sub-2~ sequently, because of i ts hydrophobi c nature 9 becomes deposit-27 ed on metal surfaces with which it comes in contact. With 28 the generation of steam, the aliphatic film-forming amine 29 enters its vapor phase and thereby becomes di stri buted uni -formly throughout the entire system. The amine thereupon 8~L ~
1 becomes deposited as a very thin film upon all exposed 2 metallic interior surfaces of the system. Since this film is 3 hydrophobic in nature, it serves to protect the metallic sur-4 faces of the system against corrosive attack by the steam or water, or by both, contained in the system. Where vaporiza-6 tion of the aliphatic film-formin~ amine occurs, the tempera-7 ture of the system must be sufficient for this purpose.
8 When the systPm is under elevated pressure, as with a boiler 9 system, or possibly under reduced pressure, the temperature required to produce vaporization of the aliphatic amine will 11 be higher or lower, respec~ively, than that required at at-12 mospherio pressure.
13 As indicated previously, the corrosion-inhibiting 14 compositions of this invention may be dispersed in the system to be protected in amounts sufficient to maintain a weight of 16 composition to weight of system aqueous fluid ratio of from 17 about 0.1 to about 100 parts per million. However, when the 18 system being treated is a steam system, the amounts (by 19 weight) of corrosion-inhibiting composition of this invention .
added to the system will preferably be in the range of from 21 about 0.25 to about 2.5 parts per million by weight.
22 The corrosion-inhibiting method and corrosion-23 inhibiting properties of the compositions of this invention 24 will be further illustrated by way of examples disclosing the usefulness of the method and compositions of this invention.

27 The following composition of this invention was 28 employed in a test procedure to establish its corrosion-29 inhiblting properties:

C-962 ~

1 Ingredient% by Weight 2 Adogen~140 10 3 Adogen~140A 5 4 EO~P0 20 S Distilled Water 84 6 Strips (coupons) of a suitable metal subject to corros;on .
7 were prepared. These were of uniform dimension: 1 x 3 x 1/16 8 inches. They were cleaned, weighed and placed in steam of 9 j the part;cular system being used as the test basis. In this , i case the system was a steam system for a steel plant. The 11 coupons remained in placeifor a predetermined period of time, 2~ during which the above corrosion-inhibiting composition of 13 this invention was introduced into the steam system. For 14 comparison, another oorrosion-inhibiting material was employed for a separate and equal test interval. This material was 16~ hydrogenated tallow amine emulsified with isopropyl alcohol.
17 ~A~ter the predetermined period, the test coupons were removed 18;~rom the system, acid cleaned to remove the corrosion products, ,; : :
~ 19 and again weighed. The reduction în we;ght was then cal-:: ~ , culated on ;a yearly basis, noting ~he actual weight loss dur-21 ing the specific test period and the length o~ the predeter-22 mined time period. This`yearly weight 105s iS expressed as 23 milligrams per year, or "mpy". The comparative results ob-24 served for the test procedure just described are summarized .
below.

26 Corrosion Rates in Mils Per Year 27 Condensate Lines: A B C
28 Hydrogenated Tallow 29 Amine Emulsified w;th 7.0 15.0 12.0 30 Isopropyl Alcohol 31 Composition of this2.4 6.2 7.6 32 Example c-962 ~ 2 8 2 The following composition of this i~vention was 3 employed ;n two different systems, utiliz;ng the same test 4 procedure as outlined above in Example 12, to establish its corrosion-inhibiting,properties:
Ingredient% by Weight 7 Adogen~140 . 6 8 Pennad 150 (DEAE)15 9I EO~P0 50 2 :~
Distilled Water 77 11 . The systems uséd as the test bases were both steam 12 systems; one located in a textile finishing plant and the 13 second located on a naval base. The comparative results ob-14 served for the test procedure are summarized below.

Corrosion Rates in Mils Per Year 16 1. Textile Finishing Plant 17 . Condensate Lines , , 18 . A B
19 Hydrogenated Tallow Amine Emulsified with 11.0 7.5 21 Isopropyl Alcohol 22 Composition of this 7.5 1.3 23 Example 24 2. Naval Base .~ .
Condensate Lines 27 Hydrogenated Tallow 28 Amine Emulsified with 28 60 29 Isopropyl Alcohol Composition of this 12 ,25 31 E~ample , _ _l g _O

~ ' .

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1 These Examples illustrate the dramatic ;ncrease 2 in protec~ion against corrosion achieved when using the 3 particular compositions of this invention described.
4 Similar corrosion-inhibiting results have been found when using other compositions of this invention.

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Claims

The embodiments of the invention in which an exclu-sive property or privilege is claimed are defined as follows:

1. A corrosion-inhibiting composition comprising from about 1 to about 90% by weight of an aliphatic film-forming amine; and from about 0.1 to about 10.0% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1, respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

2. A corrosion-inhibiting composition comprising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 0.1 to about 50% by weight of an aliphatic amine salt, and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1, respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

3. A corrosion-inhibiting composition comprising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 1 to about 50% by weight of a neutralizing amine; and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1, respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

4. A corrosion-inhibiting composition comprising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 0.1 to about 50% by weight of an aliphatic amine salt; a neutralizing amine; and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different, and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1, respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

5. The composition of Claim 1, 2 or 3, additionally including from about 1 to about 99% by weight of water.

6. The composition of Claim 2 or 4, wherein the aliphatic amine salt is tallow amine acetate.

7. The composition of Claim 3, wherein the neutral-izing amine is diethylamino ethanol.

8. The composition of Claim 1, 2 or 3, wherein n is an integer of 5 to 50.

9. A method of inhibiting the corrosion of metal components which are contacted by aqueous fluids, comprising dispersing throughout said aqueous fluids a composition com-prising from about 1 to about 90% by weight of an aliphatic film-forming amine; and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1 respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

10. A method of inhibiting the corrosion of metal components which are contacted by aqueous fluids, comprising dispersing throughout said aqueous fluids a composition com-prising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 0.1 to about 50% by weight of an aliphatic amine salt; and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different, and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1 respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

11. A method of inhibiting the corrosion of metal components which are contacted by aqueous fluids, comprising dispersing throughout said aqueous fluids a composition com-prising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 1 to about 50% by weight of a neutralizing amine; and from about 0.1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1 respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

12. A method of inhibiting the corrosion of metal components which are contacted by aqueous fluids, comprising dispersing throughout said aqueous fluids a composition com-prising from about 1 to about 90% by weight of an aliphatic film-forming amine; from about 0.1 to about 50% by weight of an aliphatic amine salt; from about 1 to about 50% by weight of a neutralizing amine; and from about 1 to about 10% by weight of a polyoxyalkylene-containing tertiary amine dispersing agent represented by the formula:

wherein R1 and R2 are aliphatic hydrocarbon radicals having from 12 to 20 carbon atoms, which can be the same or different;
and wherein R3O is a polyoxyalkylene chain of randomly dis-tributed oxyethylene and oxypropylene units in a ratio of from 1:10 to 10:1 respectively, the total of all units in the chain being n, which is an integer of 3 to 100.

13. The method of Claim 9 or 10, additionally including from about 1 to about 99% of water.

14. The method of Claim 11 or 12, additionally including from about 1 to about 99% of water.

15. The method of Claim 10 or 12, wherein the aliphatic amine salt is tallow amine acetate.

16. The method of Claim 11 or 12, wherein the neutralizing amine is diethylamino ethanol.

17. The method of Claim 9 or 10, wherein n is 5 to 50.

18. The method of Claim 11 or 12, wherein n is 5 to 50.