CA2092207C - Corrosion inhibition of calcium chloride brine - Google Patents
Corrosion inhibition of calcium chloride brine Download PDFInfo
- Publication number
- CA2092207C CA2092207C CA002092207A CA2092207A CA2092207C CA 2092207 C CA2092207 C CA 2092207C CA 002092207 A CA002092207 A CA 002092207A CA 2092207 A CA2092207 A CA 2092207A CA 2092207 C CA2092207 C CA 2092207C
- Authority
- CA
- Canada
- Prior art keywords
- calcium chloride
- corrosion
- chloride brine
- brine
- present
- 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
Links
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
- C23F11/10—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 using organic inhibitors
- C23F11/167—Phosphorus-containing compounds
- C23F11/1676—Phosphonic acids
Abstract
A method of inhibiting corrosion of metals such as low carbon steel in contact with calcium chloride brine comprising adding to the brine or to the salt prior to dissolution 2-hydroxyphosphono-acetic acid.
Description
~oo~zo~
CORROSION INHIBITION OF CALCIUM CHLORIDE BRINE
FIELD OF THE INVENTION
The present invention relates to the inhibition of corrosion in the presence of calcium chloride brine. More particularly, the present invention relates to the inhibition of low carbon steel corrosion in contact with calcium chloride brine.
BACKGROUND OF THE INVENTION
Calcium chloride is a widely used industrial chemical.
Significant volumes are used as a curing accelerator in concrete, as an additive in drilling muds to control density and clay flocculation, as a drainage aid in paper mills, as a dessicant in refrigeration plants, and as a heat transfer fluid in closed recirculating cooling systems operating at I5 temperatures below zero degrees C.
209~~0'~
_2_ Calcium chloride brines in applications such as for concrete accelerators or as additives to drilling muds create serious corrosion problems. Most construction concrete is reinforced with steel bars which are embedded in the concrete and the presence of calcium chloride in the concrete accelerates corrosive attack of the reinforcing steel. The calcium chloride in drilling muds causes an accelerated corrosion of well tubing and equipment used in oil drilling applications. The use of calcium chloride as a drainage aid in the paper industry has been limited by the corrosive nature of its solutions.
In closed recirculating cooling systems where calcium chloride brine is employed as a heat transfer medium, corrosion control is necessary. Historically, chromates have been used to inhibit corrosion in calcium chloride brine systems. Chromates are soluble in these concentrated solutions and are extremely efficacious in these aggressive environments. However, the environmental and health concerns that the use of chromates presents have resulted in their being phased out as corrosion inhibitors. Nitrites are also soluble and compatible in calcium chloride brines and have been employed as a replacement for chromates. However, high levels of nitrite, that is up to 0.5%, are necessary for corrosion protection in calcium chloride brine systems.
SUMMARY OF THE INVENTION
The present invention comprises a method of controlling corrosion in calcium chloride brine systems in which an effective amount of corrosion inhibitor is added to the calcium chloride brine. The corrosion inhibitor comprises 2-hydroxyphosphono-acetic acid. The 2-hydroxyphosphonoacetic acid is preferably present in the brine solution in concentrations of from about 240 to 1000 parts per million parts brine. Typically such brine solutions are up to about 30% calcium chloride. The inhibitor of the present invention has been found to be an effective corrosion inhibitor for low carbon steel exposed to calcium chloride brine.
The efficacy of 2-hydroxyphosphonoacetie acid is unexpected in light of the limited efficacy of hydroxyethylidenediphosphonic acid (HEDP).
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention comprises a corrosion inhibited composition of calcium chloride brine which contains 2-hydroxy-phosphonoacetic acid. 2-hydroxyphosphonoacetic acid has been found to be an efficacious corrosion inhibitor in calcium chlo -ride brine. The corrosion inhibitor of the present invention has been found to be particularly efficacious for calcium chloride brines in contact with low carbon steel.
_ 209220' The inhibitor is present in the calcium chloride brine in concentrations of from about 240 to 1000 parts per million and preferably from about 240 to 500 parts per million. The inhibitor may be added directly to the brine, or the inhibitor may be added to the dry salt so that it is present when the salt is dissolved in water.
The following example describes the corrosion inhibition which is achieved with the calcium chloride and 2-hydroxyphos-phonoacetic acid solution of the present invention.
Example Testing was conducted in a beaker corrosion test apparatus. Low carbon steel corrosion probes and coupons were employed. Corrosion rates were determined electrochemically using linear polarization. The pH of the 25% calcium chloride brine test solution was adjusted to 8.4 with Na4H prior to testing. The final pH of the sample solution equilibrated to about pH 7.5.
Tests were conducted at 60°C. Table 1 summarizes the results.
TA L
Inhibitor Concentration Corrosion Rate ~(ppml Smpy~
Blank --- 100 2-Hydroxyphosphonoacetic acid 500 17 Hydroxyethylidenediphosphonic acid (HEDP) 500 45 The test data show that the composition of the present invention is significantly more effective than HEDP at inhibiting corrosion in calcium chloride brine solutions.
Testing of low carbon steel corrosion in calcium chloride brine solutions was also undertaken wherein known cooling water corrosion inhibitors were tested in calcium chloride brine. The corrosion inhibitors tested comprised a phosphorous balanced alka-line treatment and a zinc balanced alkaline treatment. The phos-phorus balanced alkaline treatment consisted of an orthophosphate, polyphosphate, azole and HPSI polymer treatment available as Continuum from Betz Laboratories, Inc., of Trevose, PA. At a concentration of 1000 ppm in the above procedure, the corrosion rate averaged 55 mpy for 3 separate runs. The zinc balanced alkaline treatment consisted of an HEDP, azole, zinc and HPSI
polymer treatment available as 8AT zinc from Betz Laboratories, Inc. At a concentration of 1000 ppm in the above procedure, the corrosion rate averaged 64 mpy over 3 runs. HPSI is an acrylic acid/allyl hydroxypropyl sulfonate ether copolymer available from Betz Laboratories, Inc. The data shows that the present invention is significantly more effective than prior art cooling water corrosion control treatments.
While the present invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of the invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true.spirit and scope of the present invention.
CORROSION INHIBITION OF CALCIUM CHLORIDE BRINE
FIELD OF THE INVENTION
The present invention relates to the inhibition of corrosion in the presence of calcium chloride brine. More particularly, the present invention relates to the inhibition of low carbon steel corrosion in contact with calcium chloride brine.
BACKGROUND OF THE INVENTION
Calcium chloride is a widely used industrial chemical.
Significant volumes are used as a curing accelerator in concrete, as an additive in drilling muds to control density and clay flocculation, as a drainage aid in paper mills, as a dessicant in refrigeration plants, and as a heat transfer fluid in closed recirculating cooling systems operating at I5 temperatures below zero degrees C.
209~~0'~
_2_ Calcium chloride brines in applications such as for concrete accelerators or as additives to drilling muds create serious corrosion problems. Most construction concrete is reinforced with steel bars which are embedded in the concrete and the presence of calcium chloride in the concrete accelerates corrosive attack of the reinforcing steel. The calcium chloride in drilling muds causes an accelerated corrosion of well tubing and equipment used in oil drilling applications. The use of calcium chloride as a drainage aid in the paper industry has been limited by the corrosive nature of its solutions.
In closed recirculating cooling systems where calcium chloride brine is employed as a heat transfer medium, corrosion control is necessary. Historically, chromates have been used to inhibit corrosion in calcium chloride brine systems. Chromates are soluble in these concentrated solutions and are extremely efficacious in these aggressive environments. However, the environmental and health concerns that the use of chromates presents have resulted in their being phased out as corrosion inhibitors. Nitrites are also soluble and compatible in calcium chloride brines and have been employed as a replacement for chromates. However, high levels of nitrite, that is up to 0.5%, are necessary for corrosion protection in calcium chloride brine systems.
SUMMARY OF THE INVENTION
The present invention comprises a method of controlling corrosion in calcium chloride brine systems in which an effective amount of corrosion inhibitor is added to the calcium chloride brine. The corrosion inhibitor comprises 2-hydroxyphosphono-acetic acid. The 2-hydroxyphosphonoacetic acid is preferably present in the brine solution in concentrations of from about 240 to 1000 parts per million parts brine. Typically such brine solutions are up to about 30% calcium chloride. The inhibitor of the present invention has been found to be an effective corrosion inhibitor for low carbon steel exposed to calcium chloride brine.
The efficacy of 2-hydroxyphosphonoacetie acid is unexpected in light of the limited efficacy of hydroxyethylidenediphosphonic acid (HEDP).
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention comprises a corrosion inhibited composition of calcium chloride brine which contains 2-hydroxy-phosphonoacetic acid. 2-hydroxyphosphonoacetic acid has been found to be an efficacious corrosion inhibitor in calcium chlo -ride brine. The corrosion inhibitor of the present invention has been found to be particularly efficacious for calcium chloride brines in contact with low carbon steel.
_ 209220' The inhibitor is present in the calcium chloride brine in concentrations of from about 240 to 1000 parts per million and preferably from about 240 to 500 parts per million. The inhibitor may be added directly to the brine, or the inhibitor may be added to the dry salt so that it is present when the salt is dissolved in water.
The following example describes the corrosion inhibition which is achieved with the calcium chloride and 2-hydroxyphos-phonoacetic acid solution of the present invention.
Example Testing was conducted in a beaker corrosion test apparatus. Low carbon steel corrosion probes and coupons were employed. Corrosion rates were determined electrochemically using linear polarization. The pH of the 25% calcium chloride brine test solution was adjusted to 8.4 with Na4H prior to testing. The final pH of the sample solution equilibrated to about pH 7.5.
Tests were conducted at 60°C. Table 1 summarizes the results.
TA L
Inhibitor Concentration Corrosion Rate ~(ppml Smpy~
Blank --- 100 2-Hydroxyphosphonoacetic acid 500 17 Hydroxyethylidenediphosphonic acid (HEDP) 500 45 The test data show that the composition of the present invention is significantly more effective than HEDP at inhibiting corrosion in calcium chloride brine solutions.
Testing of low carbon steel corrosion in calcium chloride brine solutions was also undertaken wherein known cooling water corrosion inhibitors were tested in calcium chloride brine. The corrosion inhibitors tested comprised a phosphorous balanced alka-line treatment and a zinc balanced alkaline treatment. The phos-phorus balanced alkaline treatment consisted of an orthophosphate, polyphosphate, azole and HPSI polymer treatment available as Continuum from Betz Laboratories, Inc., of Trevose, PA. At a concentration of 1000 ppm in the above procedure, the corrosion rate averaged 55 mpy for 3 separate runs. The zinc balanced alkaline treatment consisted of an HEDP, azole, zinc and HPSI
polymer treatment available as 8AT zinc from Betz Laboratories, Inc. At a concentration of 1000 ppm in the above procedure, the corrosion rate averaged 64 mpy over 3 runs. HPSI is an acrylic acid/allyl hydroxypropyl sulfonate ether copolymer available from Betz Laboratories, Inc. The data shows that the present invention is significantly more effective than prior art cooling water corrosion control treatments.
While the present invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of the invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true.spirit and scope of the present invention.
Claims (3)
1. A method of inhibiting corrosion of metal surfaces in contact with calcium chloride brines comprising adding to a calcium chloride brine an inhibitor comprising 2-hydroxyphosphono-acetic acid in amounts from about 240 to 1000 parts per million.
2. A composition of the calcium chloride brine which includes a sufficient amount of 2-hydroxyphosphonoacetic acid to inhibit corrosion of low carbon steel in contact with said composition.
3. The composition of claim 2 wherein the concentration of 2-hydroxyphosphonoacetic acid is from about 240 to 1000 parts per million.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/023,249 US5292455A (en) | 1993-02-25 | 1993-02-25 | Corrosion inhibition of calcium chloride brine |
| US023,249 | 1993-02-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2092207A1 CA2092207A1 (en) | 1994-08-26 |
| CA2092207C true CA2092207C (en) | 2004-02-03 |
Family
ID=21813955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002092207A Expired - Lifetime CA2092207C (en) | 1993-02-25 | 1993-03-23 | Corrosion inhibition of calcium chloride brine |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5292455A (en) |
| CA (1) | CA2092207C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5840207A (en) * | 1996-08-22 | 1998-11-24 | General Chemical Corporation | Corrosion inhibited calcium chloride solids and brine solutions |
| US6503420B1 (en) * | 1997-10-06 | 2003-01-07 | Fmc Corporation | Anti-corrosion solutions for air dehumidification systems |
| US6183547B1 (en) * | 1998-03-05 | 2001-02-06 | The University Of Notre Dame Du Lac | Environmentally acceptable inhibitor formulations for metal surfaces |
| AU2205900A (en) * | 1998-12-29 | 2000-07-31 | Calgon Corporation | Corrosion inhibitor compositions and methods to control metal corrosion in brinesystems |
| CN113846329A (en) * | 2021-09-27 | 2021-12-28 | 上海趋寒流体科技有限公司 | Corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2112370B (en) * | 1981-09-04 | 1984-09-26 | Ciba Geigy Ag | Inhibition of scale formation and corrosion in aqueous systems |
| US4649025A (en) * | 1985-09-16 | 1987-03-10 | W. R. Grace & Co. | Anti-corrosion composition |
| US4849171A (en) * | 1987-02-09 | 1989-07-18 | Bruce Murray | Corrosion inhibition of sodium and calcium chloride |
| US5068059A (en) * | 1990-01-16 | 1991-11-26 | Drew Chemical Corporation | Corrosion inhibitor |
-
1993
- 1993-02-25 US US08/023,249 patent/US5292455A/en not_active Expired - Lifetime
- 1993-03-23 CA CA002092207A patent/CA2092207C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2092207A1 (en) | 1994-08-26 |
| US5292455A (en) | 1994-03-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |