US3885914A - Polymer-zinc corrosion inhibiting method - Google Patents
Polymer-zinc corrosion inhibiting method Download PDFInfo
- Publication number
- US3885914A US3885914A US367083A US36708373A US3885914A US 3885914 A US3885914 A US 3885914A US 367083 A US367083 A US 367083A US 36708373 A US36708373 A US 36708373A US 3885914 A US3885914 A US 3885914A
- Authority
- US
- United States
- Prior art keywords
- zinc
- polymer
- corrosion
- molecular weight
- corrosion inhibiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
Definitions
- this invention relates to the use of compositions comprising low molecular weight polymers and zinc to inhibit the corrosion of metals in water systems which contain oxygen-bearing waters.
- Oxygen corrosion is. of course. a serious problem in any metal-containing water system.
- the corrosion of iron and steel is of principal concern because of their zothiazole may be added to the final formulation in varying amounts to improve its usefulness in a wider variety of industrial applications where both steel and copper or its alloys are present in the same system.
- the following table illustrates the effectiveness of polyacrylic acid (molecular weight about 1,000) and a partially hydrolyzed polyacrylamide (molecular weight about 7,000) when used with and without zinc at the dosages and pH indicated.
- test procedure used was a standard 5-day continuous immersion, mild agitation test carried out in synthetic Pittsburgh tap water for 5 days (95F). Steel corrosion rates are noted in the following table:
- compositions comprising low Aud (ppm) Zn Rnemdd) PH molecular weight polymers and zinc are effective cor- 0 (i u 200 7.2-7.4 0 l0 0 143 6.6-7.0 rosion inhibitors.
- Suitable polymers include water- 0 m m 14 h 2:) soluble salts of acrylic acid, acrylates, methacrylates, o 0 l52 (i l6.l
- the 01 mers acnlsmdomethyl profane iulfo at y The following table illustrates the influence of the may or p0 ymers o 0 e a w 30 ratio of polymer to zinc on several corrosion-inhibiting mennomd polymers and may have a molecular weght compositions of this invention. These tests were run in of from about 500 to about The Preferred synthetic Pittsburgh water. Steel electrodes were used lficulflr Weight, however, is about 0 Suitable Waterin polarization test cells with the initial pH at 7.0. Inhibsoluble salts include the alkali metal.
- alkaline earth concentrations were l l d on h b i h metal, Zinc, Cobalt, ammonium of ino and o e 81- tive material.
- the amount of corrosion that had taken kanol amine salts. place was determined from the current density at the
- the zinc ion may be supplied in many ways. For exintersection of an extrapolation of the so-called Taa l the inc i n may be dd d b utili i a w fel: portion of the anodic polar zation curve with the soluble zinc salt, such as, zinc chloride, zinc acetate, 40 equlllbnum imlxed. Potential Value, y zinc nitrate.
- zine ion may also be supplied by non of Faljaday S allows a computmon of dlrect t mathematical relationship between the current density adding zinc ust to a solution of the polymer.
- Our corrosion-inhibiting compositions can contain a and a more useful corrosion rate expression such as ratio of polvmer to zinc of from about 1:3 to about 5:1
- a method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least about 5 ppm of a composition comprising zinc and at least one low molecular weight polymer selected from the group consisting of polyacrylamide, poly acrylic acid and sodium polacrylate.
- a method as in claim 1 wherein the ratio of polymer to zinc is from about 1:3 to about 5:1 by weight.
- a method as in claim 1 wherein the ratio of polymer to zinc is from about 3:1 to about 4:1.
Abstract
Use of low molecular weight polymers and zinc to inhibit the corrosion of metals by oxygen-bearing waters.
Description
United States Patent [1 1 Hollingshad et a1.
[ POLYMER-ZINC CORROSION INHIBITING METHOD [75] Inventors: William Robert Hollingshad, Bethel Park; Paul Hotchkiss Ralston, Pittsburgh, both of Pa.
[73] Assignee: Calgon Corporation, Pittsburgh, Pa.
[22] Filed: June 4, 1973 [21] Appl. No.: 367,083
[56] References Cited UNITED STATES PATENTS 3,578,589 5/1971 l-lwa 2l/2.7 R
[ 51 May 27, 1975 3,663,448 5/1972 Ralston 21/2.7 R 3,669,615 6/1972 Murray 2l/2.7 R
3,669,616 6/1972 Murray 2l/2.7 R
3,709,815 1/1973 Boothe t 252/180 3,709,816 l/1973 Walker 252/180 3,723,333 3/1973 Freyhold 21/27 R 3,752,761 8/1973 Boothe 4. 252/180 3,766,077 10/1973 Hwa 21/2.7 R 3,816,333 6/1974 King 21/2.7 R
Primary Examiner-Benjamin R. Padgett Assistant Examiner-Donald P. Walsh Attorriy, Agent, or Firml-1arry 'E. W'estlakej' Rudolph J. Anderson; Martin L. Katz [5 7 ABSTRACT Use of low molecular weight polymers and zinc to inhibit the corrosion of metals by oxygen-bearing watGI'S.
4 Claims, N0 Drawings 1 POLYMER-ZINC CORROSION INHIBITING METHOD BACKGROUND OF THE INVENTION This invention relates to the inhibition of corrosion in water systems which utilize oxygen-bearing waters.
More particularly. this invention relates to the use of compositions comprising low molecular weight polymers and zinc to inhibit the corrosion of metals in water systems which contain oxygen-bearing waters.
Oxygen corrosion is. of course. a serious problem in any metal-containing water system. The corrosion of iron and steel is of principal concern because of their zothiazole may be added to the final formulation in varying amounts to improve its usefulness in a wider variety of industrial applications where both steel and copper or its alloys are present in the same system.
The following table illustrates the effectiveness of polyacrylic acid (molecular weight about 1,000) and a partially hydrolyzed polyacrylamide (molecular weight about 7,000) when used with and without zinc at the dosages and pH indicated.
The test procedure used was a standard 5-day continuous immersion, mild agitation test carried out in synthetic Pittsburgh tap water for 5 days (95F). Steel corrosion rates are noted in the following table:
extensive use in many types of water systems. Copper TABL and its alloys, aluminum and its alloys. and galvanized E l steel are also used in water systems and are subject to w h /L C v R D f I erg t oss orrosion atc ata or Corroslon' N? h qlscovfired no\el .conioblon mhlbl' Polymers of Polyacrylic Acid and Partially Hydrolyzcd tors which will inhibit oxygen corrosion in water sys- Polyacryla mide With and Without Zinc tems containing such metals. P Partially SUMMARY OF THE INVENTION Polyacrylic Corrosion +a We have found that compositions comprising low Aud (ppm) Zn Rnemdd) PH molecular weight polymers and zinc are effective cor- 0 (i u 200 7.2-7.4 0 l0 0 143 6.6-7.0 rosion inhibitors. Suitable polymers include water- 0 m m 14 h 2:) soluble salts of acrylic acid, acrylates, methacrylates, o 0 l52 (i l6.l
3o 0 l0 :3 unhydrolyzed or partially hydrolyzed acrylamides, and
i n e The 01 mers acnlsmdomethyl profane iulfo at y The following table illustrates the influence of the may or p0 ymers o 0 e a w 30 ratio of polymer to zinc on several corrosion-inhibiting mennomd polymers and may have a molecular weght compositions of this invention. These tests were run in of from about 500 to about The Preferred synthetic Pittsburgh water. Steel electrodes were used lficulflr Weight, however, is about 0 Suitable Waterin polarization test cells with the initial pH at 7.0. Inhibsoluble salts include the alkali metal. alkaline earth concentrations were l l d on h b i h metal, Zinc, Cobalt, ammonium of ino and o e 81- tive material. The amount of corrosion that had taken kanol amine salts. place was determined from the current density at the The zinc ion may be supplied in many ways. For exintersection of an extrapolation of the so-called Taa l the inc i n may be dd d b utili i a w fel: portion of the anodic polar zation curve with the soluble zinc salt, such as, zinc chloride, zinc acetate, 40 equlllbnum imlxed. Potential Value, y zinc nitrate. and zinc sulfate, which forms zinc ions in ffirred to as COYTOSIOH P a E nrf. Applicaaqueous solution. The zine ion may also be supplied by non of Faljaday S allows a computmon of dlrect t mathematical relationship between the current density adding zinc ust to a solution of the polymer.
at Em. expressed in amperes per square centimeter Our corrosion-inhibiting compositions can contain a and a more useful corrosion rate expression such as ratio of polvmer to zinc of from about 1:3 to about 5:1
. f d h V f m I bout milligrams of steel consumed per square deeimeter of by welght' 8 errc rano Is f surface per day (m.d.d.) and mils per year (m.p.y.). 3:1 b 1 hese COmpOSmOnF e This relationship is such that a current density value of tively inhibit corrosion of metals when maintained in a -1 amperes/cmzxl mg/dmz/day Further the water system ataconcentration of at least about 1 ppm value is calculated from the usual formula. at the above ratios and, P y about 5 to 50 PP m.p.y.Xm.d.d. 1.44/density, using a density value of Maximum concentrations a determined y the 7.87 g/cm for steel. The corrosion rate for steel in this nomic considerations of the particular applicati nwater without inhibitor is 100 mdd. This control value Compounds such as benzotriazole or mercaptobenapplies to both Tables 2 to 3.
TABLE 2 Weight Ratio Polymer to Zinc 1 2 l 1 l Polymer Dosage (mg/l) 10 100 I0 30 Polymer Used Polyacrylic Acid Sodium Polyacrylate Partially Hydrolyzcd Polyacrylamide The following table illustrates that the effectiveness of polymeric corrosion inhibitors decreases as the molecular weight increases.
TABLE 3 Polarization Corrosion Rate Data for Sodium Polyacrylates Approximate Dosages (mg/l) Corrosion Rate Molecular Weight Polymer Zinc (mdd) .000 I00 30 61 10,000 30 0 67 10,000 30 76 l0 000 I00 0 53 10,000 100 30 56 We claim:
1. A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least about 5 ppm of a composition comprising zinc and at least one low molecular weight polymer selected from the group consisting of polyacrylamide, poly acrylic acid and sodium polacrylate.
2. A method as in claim 1 wherein the polymer has a molecular weight of from about 500 to about 10,000.
3. A method as in claim 1 wherein the ratio of polymer to zinc is from about 1:3 to about 5:1 by weight.
4. A method as in claim 1 wherein the ratio of polymer to zinc is from about 3:1 to about 4:1.
Claims (4)
1. A METHOD OF INHIBITING THE CORROSION OF METALS IN A WATER SYSTEM COMPRISING MAINTAINING IN THE WATER OF SAID STSTEM AT LEAST ABOUT 5 PPM OF A COMPOSITION COMPRISING ZINC AND AT LEAST ONE LOW MOLECULAR WEIGHT POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLAMIDE, POLY ACRYLIC ACID AND SODIUM POLACRYLATE.
2. A method as in claim 1 wherein the polymer has a molecular weight of from about 500 to about 10,000.
3. A method as in claim 1 wherein the ratio of polymer to zinc is from about 1:3 to about 5:1 by weight.
4. A method as in claim 1 wherein the ratio of polymer to zinc is from about 3:1 to about 4:1.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US367083A US3885914A (en) | 1973-06-04 | 1973-06-04 | Polymer-zinc corrosion inhibiting method |
NL7406599A NL7406599A (en) | 1973-06-04 | 1974-05-16 | |
AU69182/74A AU6918274A (en) | 1973-06-04 | 1974-05-21 | Corrosion inhibition |
CA200,836A CA1032746A (en) | 1973-06-04 | 1974-05-23 | Corrosion inhibition |
FR7418575A FR2231778B1 (en) | 1973-06-04 | 1974-05-29 | |
GB2409474A GB1455343A (en) | 1973-06-04 | 1974-05-30 | Corrosion inhibition |
DE19742426613 DE2426613A1 (en) | 1973-06-04 | 1974-05-31 | CORROSION INHIBITION |
BE145019A BE815848A (en) | 1973-06-04 | 1974-05-31 | COMPOSITION CONTAINING ZINC FOR CORROSION INHIBITION |
LU70236A LU70236A1 (en) | 1973-06-04 | 1974-06-04 | |
JP49062597A JPS5759308B2 (en) | 1973-06-04 | 1974-06-04 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US367083A US3885914A (en) | 1973-06-04 | 1973-06-04 | Polymer-zinc corrosion inhibiting method |
Publications (1)
Publication Number | Publication Date |
---|---|
US3885914A true US3885914A (en) | 1975-05-27 |
Family
ID=23445866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US367083A Expired - Lifetime US3885914A (en) | 1973-06-04 | 1973-06-04 | Polymer-zinc corrosion inhibiting method |
Country Status (10)
Country | Link |
---|---|
US (1) | US3885914A (en) |
JP (1) | JPS5759308B2 (en) |
AU (1) | AU6918274A (en) |
BE (1) | BE815848A (en) |
CA (1) | CA1032746A (en) |
DE (1) | DE2426613A1 (en) |
FR (1) | FR2231778B1 (en) |
GB (1) | GB1455343A (en) |
LU (1) | LU70236A1 (en) |
NL (1) | NL7406599A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4018701A (en) * | 1975-07-31 | 1977-04-19 | Calgon Corporation | Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same |
US4105405A (en) * | 1976-11-27 | 1978-08-08 | Henkel Kommanditgesellschaft Auf Aktien | Method and composition for inhibiting corrosion of metals in contact with water |
US4324684A (en) * | 1979-10-29 | 1982-04-13 | Betz Laboratories, Inc. | Stable compositions for use as corrosion inhibitors |
US4411865A (en) * | 1979-04-05 | 1983-10-25 | Betz Laboratories, Inc. | Method of corrosion inhibition in aqueous mediums |
US4512552A (en) * | 1982-11-16 | 1985-04-23 | Katayama Chemical Works Co., Ltd. | Corrosion inhibitor |
US4529572A (en) * | 1984-09-21 | 1985-07-16 | Nalco Chemical Company | Polymer-zinc corrosion inhibitor |
US4759900A (en) * | 1986-08-27 | 1988-07-26 | General Electric Company | Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors |
US4765921A (en) * | 1986-07-03 | 1988-08-23 | Coatex S.A. | Acid composition with high concentrations of active materials for the treatment of water and/or cleaning installations containing same |
EP0311192A1 (en) * | 1987-10-05 | 1989-04-12 | Calgon Corporation | Method of controlling corrosion at high pH |
US4936987A (en) * | 1983-03-07 | 1990-06-26 | Calgon Corporation | Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers |
US4950449A (en) * | 1986-08-27 | 1990-08-21 | General Electric Company | Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors |
US5137657A (en) * | 1991-04-24 | 1992-08-11 | Merck & Co., Inc. | Synergistic combination of sodium silicate and orthophosphate for controlling carbon steel corrosion |
US5232629A (en) * | 1991-04-24 | 1993-08-03 | Calgon Corporation | Synergistic combination of sodium silicate and ortho-phosphate for controlling carbon steel corrosion |
CN114057304A (en) * | 2020-08-05 | 2022-02-18 | 中国石油化工股份有限公司 | Composition for phosphorus-free pre-filming, method for pre-filming circulating cooling water system by using composition and application |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4163733A (en) * | 1977-10-25 | 1979-08-07 | Buckman Laboratories, Inc. | Synergistic compositions for corrosion and scale control |
CA1118590A (en) * | 1979-04-05 | 1982-02-23 | Gary E. Geiger | Stable compositions for use as corrosion inhibitors |
US4502978A (en) * | 1982-11-08 | 1985-03-05 | Nalco Chemical Company | Method of improving inhibitor efficiency in hard waters |
JPS63146702U (en) * | 1987-03-19 | 1988-09-28 | ||
US8524299B2 (en) * | 2005-05-20 | 2013-09-03 | The Procter & Gamble Company | Wet pet food products comprising a first layer bonded with a base food |
US9480275B2 (en) * | 2005-05-20 | 2016-11-01 | Mars Incorporated | Coated pet food products |
US20060260537A1 (en) * | 2005-05-20 | 2006-11-23 | The Iams Company | Wet pet food products and method for preparation |
US20130118987A1 (en) * | 2011-11-16 | 2013-05-16 | Ecowater Systems Llc | Anti-scale water treatment system and method |
CN102934758B (en) * | 2012-12-06 | 2014-09-10 | 山东新希望六和集团有限公司 | Feed for laying hen |
CN112771207A (en) * | 2018-08-28 | 2021-05-07 | 花王株式会社 | Oil and gas field corrosion inhibitor composition |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3578589A (en) * | 1969-03-17 | 1971-05-11 | Grace W R & Co | Method for treating cooling water |
US3663448A (en) * | 1970-09-25 | 1972-05-16 | Calgon Corp | Inhibiting scale deposition |
US3669615A (en) * | 1970-09-28 | 1972-06-13 | William Bruce Murray | Corrosion inhibiting method |
US3669616A (en) * | 1971-09-28 | 1972-06-13 | Virginia Chemicals Inc | Corrosion inhibiting compositions and method |
US3709815A (en) * | 1971-07-01 | 1973-01-09 | Calgon Corp | Boiler water treatment |
US3709816A (en) * | 1971-07-01 | 1973-01-09 | Calgon Corp | Control of alluvial and other deposits in aqueous systems |
US3723333A (en) * | 1968-05-11 | 1973-03-27 | Henkel & Cie Gmbh | Method for inhibiting corrosion and mineral deposits in water systems |
US3752761A (en) * | 1972-03-09 | 1973-08-14 | Calgon Corp | Boiler water treatment |
US3766077A (en) * | 1972-08-16 | 1973-10-16 | Chemed Corp | Compositions and method for inhibiting scaling in aqueous systems |
US3816333A (en) * | 1971-07-07 | 1974-06-11 | Monsanto Co | Methods of inhibiting corrosion with condensed polyalkylenepolyamine derivatives |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3687610A (en) * | 1969-07-30 | 1972-08-29 | Nalco Chemical Co | Process for inhibiting corrosion of metallic surfaces with cooling water containing phenol - aldehyde resins |
GB1374270A (en) * | 1971-12-10 | 1974-11-20 | Ciba Geigy Ag | Polymaleic anhydride compositions and their use |
FR2198106A1 (en) * | 1972-09-04 | 1974-03-29 | Rhone Progil | Corrosion and scale prevention in cooling systems - using phosphates, zinc salts and acrylic polymers |
-
1973
- 1973-06-04 US US367083A patent/US3885914A/en not_active Expired - Lifetime
-
1974
- 1974-05-16 NL NL7406599A patent/NL7406599A/xx not_active Application Discontinuation
- 1974-05-21 AU AU69182/74A patent/AU6918274A/en not_active Expired
- 1974-05-23 CA CA200,836A patent/CA1032746A/en not_active Expired
- 1974-05-29 FR FR7418575A patent/FR2231778B1/fr not_active Expired
- 1974-05-30 GB GB2409474A patent/GB1455343A/en not_active Expired
- 1974-05-31 DE DE19742426613 patent/DE2426613A1/en not_active Ceased
- 1974-05-31 BE BE145019A patent/BE815848A/en not_active IP Right Cessation
- 1974-06-04 LU LU70236A patent/LU70236A1/xx unknown
- 1974-06-04 JP JP49062597A patent/JPS5759308B2/ja not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723333A (en) * | 1968-05-11 | 1973-03-27 | Henkel & Cie Gmbh | Method for inhibiting corrosion and mineral deposits in water systems |
US3578589A (en) * | 1969-03-17 | 1971-05-11 | Grace W R & Co | Method for treating cooling water |
US3663448A (en) * | 1970-09-25 | 1972-05-16 | Calgon Corp | Inhibiting scale deposition |
US3669615A (en) * | 1970-09-28 | 1972-06-13 | William Bruce Murray | Corrosion inhibiting method |
US3709815A (en) * | 1971-07-01 | 1973-01-09 | Calgon Corp | Boiler water treatment |
US3709816A (en) * | 1971-07-01 | 1973-01-09 | Calgon Corp | Control of alluvial and other deposits in aqueous systems |
US3816333A (en) * | 1971-07-07 | 1974-06-11 | Monsanto Co | Methods of inhibiting corrosion with condensed polyalkylenepolyamine derivatives |
US3669616A (en) * | 1971-09-28 | 1972-06-13 | Virginia Chemicals Inc | Corrosion inhibiting compositions and method |
US3752761A (en) * | 1972-03-09 | 1973-08-14 | Calgon Corp | Boiler water treatment |
US3766077A (en) * | 1972-08-16 | 1973-10-16 | Chemed Corp | Compositions and method for inhibiting scaling in aqueous systems |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4018701A (en) * | 1975-07-31 | 1977-04-19 | Calgon Corporation | Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same |
US4105405A (en) * | 1976-11-27 | 1978-08-08 | Henkel Kommanditgesellschaft Auf Aktien | Method and composition for inhibiting corrosion of metals in contact with water |
US4411865A (en) * | 1979-04-05 | 1983-10-25 | Betz Laboratories, Inc. | Method of corrosion inhibition in aqueous mediums |
US4324684A (en) * | 1979-10-29 | 1982-04-13 | Betz Laboratories, Inc. | Stable compositions for use as corrosion inhibitors |
US4512552A (en) * | 1982-11-16 | 1985-04-23 | Katayama Chemical Works Co., Ltd. | Corrosion inhibitor |
US4936987A (en) * | 1983-03-07 | 1990-06-26 | Calgon Corporation | Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers |
US4529572A (en) * | 1984-09-21 | 1985-07-16 | Nalco Chemical Company | Polymer-zinc corrosion inhibitor |
US4765921A (en) * | 1986-07-03 | 1988-08-23 | Coatex S.A. | Acid composition with high concentrations of active materials for the treatment of water and/or cleaning installations containing same |
US4759900A (en) * | 1986-08-27 | 1988-07-26 | General Electric Company | Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors |
US4950449A (en) * | 1986-08-27 | 1990-08-21 | General Electric Company | Inhibition of radioactive cobalt deposition in water-cooled nuclear reactors |
EP0311192A1 (en) * | 1987-10-05 | 1989-04-12 | Calgon Corporation | Method of controlling corrosion at high pH |
US5137657A (en) * | 1991-04-24 | 1992-08-11 | Merck & Co., Inc. | Synergistic combination of sodium silicate and orthophosphate for controlling carbon steel corrosion |
US5232629A (en) * | 1991-04-24 | 1993-08-03 | Calgon Corporation | Synergistic combination of sodium silicate and ortho-phosphate for controlling carbon steel corrosion |
CN114057304A (en) * | 2020-08-05 | 2022-02-18 | 中国石油化工股份有限公司 | Composition for phosphorus-free pre-filming, method for pre-filming circulating cooling water system by using composition and application |
CN114057304B (en) * | 2020-08-05 | 2023-02-28 | 中国石油化工股份有限公司 | Composition for phosphorus-free pre-filming, method for pre-filming circulating cooling water system by using composition and application |
Also Published As
Publication number | Publication date |
---|---|
GB1455343A (en) | 1976-11-10 |
NL7406599A (en) | 1974-12-06 |
BE815848A (en) | 1974-12-02 |
CA1032746A (en) | 1978-06-13 |
FR2231778B1 (en) | 1979-02-16 |
AU6918274A (en) | 1975-11-27 |
JPS5021950A (en) | 1975-03-08 |
LU70236A1 (en) | 1975-03-06 |
DE2426613A1 (en) | 1975-01-02 |
JPS5759308B2 (en) | 1982-12-14 |
FR2231778A1 (en) | 1974-12-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: CALGON CORPORATION ROUTE 60 & CAMPBELL'S RUN ROAD, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE JULY 1, 1982;ASSIGNOR:CALGON CARBON CORPORATION (FORMERLY CALGON CORPORATION) A DE COR.;REEL/FRAME:004076/0929 Effective date: 19821214 |
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STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |