WO1998036044A1 - Rinse aid and process for stainless steel - Google Patents
Rinse aid and process for stainless steel Download PDFInfo
- Publication number
- WO1998036044A1 WO1998036044A1 PCT/US1998/001721 US9801721W WO9836044A1 WO 1998036044 A1 WO1998036044 A1 WO 1998036044A1 US 9801721 W US9801721 W US 9801721W WO 9836044 A1 WO9836044 A1 WO 9836044A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stainless steel
- acid
- rinse
- hydrogen peroxide
- present
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/042—Acids
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
- C11D1/146—Sulfuric acid esters
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3947—Liquid compositions
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Definitions
- a hydrogen peroxide rinse aid solution comprising about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent) , and about 69.6% w/w water, has been added to hydrochloric acid stainless steel rinse baths as a rinse aid to improve significantly the cleaning ability of the bath.
- This hydrogen peroxide rinse aid solution was then metered into a stainless steel rinse bath at the rate of about 2 times the rate of addition to the rinse bath of 32-38% w/w hydrochloric acid.
- Another embodiment of the present invention is a rinse aid for a hydrochloric acid rinse bath for acid pickled stainless steel, comprising from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water.
- Another embodiment of the present invention is a rinse bath for acid pickled stainless steel, comprising about two parts of a first solution of from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water, and about one part of a second solution of from about 32 to 38% w/w hydrochloric acid.
- Another embodiment of the present invention is a process for cleaning acid pickled stainless steel, comprising providing a rinse bath to receive acid pickled stainless steel; introducing a first solution of from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2- ethylhexyl sulfate, and the balance water, into the rinse bath of the providing step at a first rate; introducing a second solution of from about 32 to 38% w/w hydrochloric acid into the rinse bath of the providing step simultaneously with the introducing a first solution step at a second rate that is about one- half the first rate; and rinsing acid pickled stainless steel in the rinse bath.
- a principal object of the present invention is to provide a rinse aid solution that may be added to hydrochloric acid rinse baths to enable stainless steel producers to produce high quality stainless steel finishes that are comparable to the finishes obtained with nitric/hydrofluoric acid rinse solutions using less toxic and less hazardous hydrochloric acid as the cleaning medium.
- Figure 1 is a schematic drawing of a typical stainless steel pickling line showing the addition of the rinse aid solution of the present invention and 32- 38% w/w hydrochloric acid to the rinse section of a typical acid pickling line for stainless steel.
- a hydrogen peroxide rinse aid solution to be added to a hydrochloric acid stainless steel rinse bath comprising about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent), and about 69.6% w/w water.
- This hydrogen peroxide rinse aid solution was then metered into a stainless steel pickling rinse bath at the rate of about 2 times the rate of addition of 32-38% w/w hydrochloric acid to the rinse bath (see Fig. 1) .
- Acid pickled stainless steel thereafter processed through the rinse bath came out of the rinse bath with a high quality stainless steel finish that was bright and clear and was comparable to the stainless steel finish obtained with nitric/hydrofluoric acid rinse systems .
- hydrogen peroxide rinse aid solutions comprising from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent), and the balance water, when added to a stainless steel pickling rinse bath at the rate of about 2 times the rate of addition of about 32 to 38% w/w hydrochloric acid, rinsed stainless steel oxide and smutt from acid pickled stainless steel and produced a stainless steel finish that was bright and clear.
- the most preferred hydrogen peroxide rinse aid solution of the present invention was added to the rinse tank in a separate stream at the rate of 1 gallon/minute while a separate stream of 0.5 gallons/minute of 32% w/w hydrochloric acid was added to the rinse tank.
- the hydrogen peroxide rinse aid solutions of the present invention are added to the second rinse section of the after the acid bath.
- the usage rate of the hydrogen peroxide rinse aid solutions of the present invention depends upon the degree of smutting present on the surfaces of the acid pickled stainless steel to be cleaned.
- the concentration of the hydrogen peroxide rinse aid solutions of the present invention in hydrochloric acid rinse baths may be regulated with a chemical titration method utilizing potassium permanganate. This method will tell how much peroxide, and thus how much of the rinse aid solution of the present invention, is present in the risen bath at any given time.
Abstract
Hydrogen peroxide rinse aid solutions of the present invention added to hydrochloric acid rinse baths for acid pickled stainless steel enables hydrochloric acid rinse baths to easily remove stainless steel oxides and smut from the surfaces of acid pickled stainless steel to produce a bright and clean finish that is comparable to the finish produced by nitric/hydrofluoric acid rinse systems.
Description
RINSE AID AND PROCESS FOR STAINLESS STEEL
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Normally, stainless steel is cleaned after acid pickling with nitric/hydrofluoric acids to remove stainless steel oxides and smutt from its surfaces in order to produce an acceptable bright and clean finish. However, the use of nitric acids creates toxic nitrous oxide fumes and is otherwise very costly to use. The steel industry is therefore now trying to use hydrochloric acid in place of nitric/hydrofluoric acids to clean acid pickled stainless steel, but the surfaces of the stainless steel are not being cleaned as well, primarily because hydrochloric acid is not an oxidizing acid.
Summary of the Invention
It has been discovered that by adding a hydrogen peroxide rinse aid solution to a hydrochloric acid rinse bath for acid pickled stainless steel the rinse bath easily removes stainless steel oxides and smutt from the surfaces of the stainless steel to produce a bright and clean finish that is comparable to the finish produced by nitric/hydrofluoric acid rinse systems.
In a most preferred embodiment to date of the present invention, a hydrogen peroxide rinse aid solution comprising about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent) , and about 69.6% w/w water, has been added to hydrochloric acid stainless steel rinse baths as a rinse aid to improve significantly the cleaning ability of the bath. This hydrogen peroxide rinse aid solution was then metered into a stainless steel rinse bath at the rate
of about 2 times the rate of addition to the rinse bath of 32-38% w/w hydrochloric acid.
Another embodiment of the present invention is a rinse aid for a hydrochloric acid rinse bath for acid pickled stainless steel, comprising from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water.
Another embodiment of the present invention is a rinse bath for acid pickled stainless steel, comprising about two parts of a first solution of from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water, and about one part of a second solution of from about 32 to 38% w/w hydrochloric acid. Another embodiment of the present invention is a process for cleaning acid pickled stainless steel, comprising providing a rinse bath to receive acid pickled stainless steel; introducing a first solution of from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2- ethylhexyl sulfate, and the balance water, into the rinse bath of the providing step at a first rate; introducing a second solution of from about 32 to 38% w/w hydrochloric acid into the rinse bath of the providing step simultaneously with the introducing a first solution step at a second rate that is about one- half the first rate; and rinsing acid pickled stainless steel in the rinse bath. A principal object of the present invention is to provide a rinse aid solution that may be added to hydrochloric acid rinse baths to enable stainless steel producers to produce high quality stainless steel finishes that are comparable to the finishes obtained with nitric/hydrofluoric acid rinse solutions using
less toxic and less hazardous hydrochloric acid as the cleaning medium.
Related objects and advantages of the present invention will become apparent from the following descriptions of the drawings and the preferred embodiments to date.
Brief Description of the Drawing Figures
Figure 1 is a schematic drawing of a typical stainless steel pickling line showing the addition of the rinse aid solution of the present invention and 32- 38% w/w hydrochloric acid to the rinse section of a typical acid pickling line for stainless steel.
Descripti n of the Preferred F.mbodi men s
In a most preferred embodiment to date, a hydrogen peroxide rinse aid solution to be added to a hydrochloric acid stainless steel rinse bath was prepared, comprising about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent), and about 69.6% w/w water. This hydrogen peroxide rinse aid solution was then metered into a stainless steel pickling rinse bath at the rate of about 2 times the rate of addition of 32-38% w/w hydrochloric acid to the rinse bath (see Fig. 1) . Acid pickled stainless steel thereafter processed through the rinse bath came out of the rinse bath with a high quality stainless steel finish that was bright and clear and was comparable to the stainless steel finish obtained with nitric/hydrofluoric acid rinse systems . In testing completed to date, hydrogen peroxide rinse aid solutions comprising from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate (a preferred wetting agent), and the balance water, when added to a stainless steel pickling rinse bath at the rate of about 2 times the rate of addition of about 32 to 38% w/w hydrochloric acid, rinsed stainless steel oxide and smutt from acid pickled stainless steel and produced a stainless steel finish that was bright and clear.
During a recent 12 hour test run on a pickling line for stainless steel 409 that was running at an average speed of 10 tons of steel per hour, the most preferred hydrogen peroxide rinse aid solution of the present invention was added to the rinse tank in a
separate stream at the rate of 1 gallon/minute while a separate stream of 0.5 gallons/minute of 32% w/w hydrochloric acid was added to the rinse tank. On average, for every ton of stainless steel processed, about 53.8 pounds of the hydrogen peroxide rinse aid of the present invention (about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate, and about 69.6% w/w water) , and about 29 pounds of 32% w/w hydrochloric acid were used. It was noted that whenever the flow of the hydrogen peroxide rinse aid solution of the present invention was stopped, the stainless steel leaving the rinse tank had black streaks on its surfaces.
Most typically, the hydrogen peroxide rinse aid solutions of the present invention are added to the second rinse section of the after the acid bath. The usage rate of the hydrogen peroxide rinse aid solutions of the present invention depends upon the degree of smutting present on the surfaces of the acid pickled stainless steel to be cleaned. The concentration of the hydrogen peroxide rinse aid solutions of the present invention in hydrochloric acid rinse baths may be regulated with a chemical titration method utilizing potassium permanganate. This method will tell how much peroxide, and thus how much of the rinse aid solution of the present invention, is present in the risen bath at any given time.
Claims
1. A rinse aid for a hydrochloric acid rinse bath for acid pickled stainless steel, comprising from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water.
2. The rinse aid of claim 1 wherein hydrogen peroxide is present in about 7.7% w/w, phosphoric acid is present in about 3.57% w/w, sodium 2-ethylhexyl sulfate is present in about 1.66% w/w, and water is present in about 69.6% w/w.
3. A rinse bath for acid pickled stainless steel, comprising about two parts of a first solution of from about 2 to 20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2- ethylhexyl sulfate, and the balance water, and about one part of a second solution of from about 32 to 38% w/w hydrochloric acid.
4. The rinse bath of claim 3 wherein the components of the first solution are hydrogen peroxide present in about 7.7% w/w, phosphoric acid present in about 3.57% w/w, sodium 2-ethylhexyl sulfate present in about 1.66% w/w, and water present in about 69.6% w/w.
5. A process for cleaning acid pickled stainless steel, comprising providing a rinse bath to receive acid pickled stainless steel; introducing a first solution of from about 2 to
20% w/w hydrogen peroxide, about 3 to 4% w/w phosphoric acid, about 1 to 4% w/w sodium 2-ethylhexyl sulfate, and the balance water, into the rinse bath of the providing step at a first rate; introducing a second solution of from about 32 to 38% w/w hydrochloric acid into the rinse bath of the providing step simultaneously with the introducing a first solution step at a second rate that is about one- half said first rate; and rinsing acid pickled stainless steel in the rinse bath.
6. The method of claim 5 wherein the solution of the introducing a first solution step is about 7.7% w/w hydrogen peroxide, about 3.57% w/w phosphoric acid, about 1.66% w/w sodium 2-ethylhexyl sulfate, and about 69.6% w/w water.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4007597P | 1997-02-13 | 1997-02-13 | |
| US60/040,075 | 1997-02-13 | ||
| US4018697P | 1997-03-12 | 1997-03-12 | |
| US60/040,186 | 1997-03-12 | ||
| US08/947,994 | 1997-10-09 | ||
| US08/947,994 US5821212A (en) | 1997-02-13 | 1997-10-09 | Rinse aid and process for stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998036044A1 true WO1998036044A1 (en) | 1998-08-20 |
Family
ID=27365656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/001721 WO1998036044A1 (en) | 1997-02-13 | 1998-01-28 | Rinse aid and process for stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1998036044A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1022357A1 (en) * | 1999-01-22 | 2000-07-26 | BSH Bosch und Siemens Hausgeräte GmbH | Surface treatment process for stainless steels |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4012351A (en) * | 1972-11-20 | 1977-03-15 | Amchem Products, Inc. | Stabilization of acidic aqueous coating compositions containing an organic coating-forming material |
| US4806161A (en) * | 1987-12-04 | 1989-02-21 | Teleflex Incorporated | Coating compositions |
| EP0351772A2 (en) * | 1988-07-19 | 1990-01-24 | HENKEL CORPORATION (a Delaware corp.) | Stabilized hydrogen peroxide |
| US5052421A (en) * | 1988-07-19 | 1991-10-01 | Henkel Corporation | Treatment of aluminum with non-chrome cleaner/deoxidizer system followed by conversion coating |
| US5421897A (en) * | 1992-07-17 | 1995-06-06 | Grawe; John | Abatement process for contaminants |
-
1998
- 1998-01-28 WO PCT/US1998/001721 patent/WO1998036044A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4012351A (en) * | 1972-11-20 | 1977-03-15 | Amchem Products, Inc. | Stabilization of acidic aqueous coating compositions containing an organic coating-forming material |
| US4806161A (en) * | 1987-12-04 | 1989-02-21 | Teleflex Incorporated | Coating compositions |
| EP0351772A2 (en) * | 1988-07-19 | 1990-01-24 | HENKEL CORPORATION (a Delaware corp.) | Stabilized hydrogen peroxide |
| US5052421A (en) * | 1988-07-19 | 1991-10-01 | Henkel Corporation | Treatment of aluminum with non-chrome cleaner/deoxidizer system followed by conversion coating |
| US5421897A (en) * | 1992-07-17 | 1995-06-06 | Grawe; John | Abatement process for contaminants |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1022357A1 (en) * | 1999-01-22 | 2000-07-26 | BSH Bosch und Siemens Hausgeräte GmbH | Surface treatment process for stainless steels |
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