GB2331106A - Use of polyvinyl alcohol as rust remover - Google Patents
Use of polyvinyl alcohol as rust remover Download PDFInfo
- Publication number
- GB2331106A GB2331106A GB9723439A GB9723439A GB2331106A GB 2331106 A GB2331106 A GB 2331106A GB 9723439 A GB9723439 A GB 9723439A GB 9723439 A GB9723439 A GB 9723439A GB 2331106 A GB2331106 A GB 2331106A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polyvinyl alcohol
- film
- solution
- rust
- proportion
- 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.)
- Withdrawn
Links
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 19
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 17
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 125000004185 ester group Chemical group 0.000 claims description 2
- 125000001033 ether group Chemical group 0.000 abstract 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- BEFDCLMNVWHSGT-UHFFFAOYSA-N ethenylcyclopentane Chemical compound C=CC1CCCC1 BEFDCLMNVWHSGT-UHFFFAOYSA-N 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 229940075582 sorbic acid Drugs 0.000 description 2
- 235000010199 sorbic acid Nutrition 0.000 description 2
- 239000004334 sorbic acid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004150 EU approved colour Substances 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- LDHBWEYLDHLIBQ-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide;hydrate Chemical compound O.[OH-].[O-2].[Fe+3] LDHBWEYLDHLIBQ-UHFFFAOYSA-M 0.000 description 1
- 229940006093 opthalmologic coloring agent diagnostic Drugs 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920001290 polyvinyl ester Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- 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
- 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
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3753—Polyvinylalcohol; Ethers or esters thereof
-
- 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
- C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes
-
- 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
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/40—Specific cleaning or washing processes
- C11D2111/42—Application of foam or a temporary coating on the surface to be cleaned
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Detergent Compositions (AREA)
Abstract
A method of removing rust from an iron or steel surface comprises coating the surface with an aqueous solution of a polyvinyl alcohol, allowing the solution to dry to form a film, and then peeling off the film. The solution may 5 - 20% polyvinyl alcohol by weight and the polyvinyl alcohol may have a proportion of free hydroxyl groups to all available ether groups of at least 70%. After stripping a second film of polyvinyl alcohol may be applied.
Description
Rust Remover and Preventer
This invention relates to a method of removing rust from a surface and also of preventing the surface from rusting.
Removal of rust from steel and iron surfaces is a constant and very well-known problem. Methods generally fall into one of two categories: mechanical or chemical.
Nfechanical methods include tumble polishing, wire brushing etc. where the rust (and part of the surface) is physically removed. Chemical methods include treatment with acid (pickling) to dissolve the rust and leave a clean metallic surface. Preferred processes involve the use of phosphoric acid and other components which provide a passive surface which deters further rusting.
We have now found that deposits of surface rust, particularly relatively recent formations which exist only on the outer surface of the iron or steel, can be simply removed by the formation on the surface of a film which is subsequently stripped. The film comprises polyvinyl alcohol and can conveniently be formed on the surface by the application of an aqueous solution of polyvinyl alcohol by brushing, spraying, dipping etc. the coating is allowed to dry to form a coherent tough film which is then peeled from the surface. Surprisingly, the film absorbs surface rust which appears to become locked into the plastic film structure. When the film is stripped off the surface, all the rust is removed leaving a clean rust-free surface.
It may be noted that if the stripped film is then dissolved in water, the hydrated ferric oxide forming the rust particles settles to the bottom of the solution and can be recovered.
Any suitable film-forming polyvinyl alcohol is suitable for this method. Polyvinyl alcohols are conventionally produced by hydrolysis of polyvinyl esters, generally polyvinyl acetate. The degree of hydrolysis controls the dissolution rate in water: the greater the degree of hydrolysis (ie the more free hydroxy groups are present), the slower the dissolution rate in cold water. Polyvinyl alcohol compositions are generally divided into hot water soluble (ie those which only dissolve in water at an appreciable rate at relatively high temperatures) and cold water soluble preparations. Either are suitable in this method, although hot water soluble compositions are preferred.
Typically the proportion of free hydroxy groups to all available ester groups is 70% or more, preferably 90% or more, and more preferably 95% to 99%. A specific example contains 98.3% free hydroxy groups.
The amount of polyvinyl alcohol dissolved in water to form the "paint" which is applied to the surface of the iron or steel is not critical. It should however be chosen within a dilution range which allows for a sufficiently thick film of polyvinyl alcohol to be formed on the surface with one coating (ie the viscosity should be such that a relatively thick film is produced). On the other hand, the solution should not be so concentrated that the viscosity is too high to produce a reasonable coating. In general a range of from 5 to 20 percent by weight is suitable, typically 7.5 to 12% and most preferably about 10%. The solution may contain preservatives such as mould inhibitors, for example sorbic acid, and colouring agents to make the presence of the film easier to detect.
Aqueous solutions of polyvinyl alcohols within the ranges stated above are stable over a wide range of storage conditions. In particular, although so-called hot water soluble materials need relatively high temperatures to cause them to dissolve, they are capable of staying in solution at much lower temperatures. Solutions should, however, be protected from freezing.
In a preferred aspect of the present invention, once the surface has been cleaned by stripping the film, it can be protected against further rusting by the provision of a second film by re-coating with a fresh polyvinyl alcohol solution. Indeed, a polyvinyl alcohol solution can be used to provide a protective film on a clean iron or steel surface whether or not the surface has previously been treated as described above.
The following example illustrates the invention.
Example
A 10% by weight suspension of Gohsenol N-300 (supplied by Nippon Gohsei) containing 0. 1% by weight of sorbic acid BP was stirred and heated up to a maximum
of 95 0 C until a clear solution formed. The mixture was not allowed to boil. The
solution is poured into air-tight containers and allowed to cool.
The solution so obtained can be applied to a rusty surface by any conventional means
(brush, roller, spreader, spray) or the rusty object can be dipped into the solution. The
coating thus applied is allowed to dry, typically at a temperature of 40 to 600 C, or any
other convenient temperature depending on the relative humidity. Once dry, the film
can be prised away from one edge of the surface and then the film can be peeled off,
leaving the surface clean and rust-free.
Claims (5)
- CLAIMS 1. A method of removing rust from an iron or steel surface comprising coating the surface with an aqueous solution of a polyvinyl alcohol, allowing the solution to dry to form a film, and then peeling off the film.
- 2. A method according to Claim 1 in which the polyvinyl alcohol is a watersoluble polyvinyl alcohol in which the proportion of free hydroxy groups to all available ester groups is 70% or more.
- 3. A method according to Claim 2 in which the proportion of free hydroxy groups is 90% or more.
- 4. A method according to Claim 2 or Claim 3 in which the proportion of free hydroxy groups is 95% to 99%.
- 5. A method according to any of Claims 1-4 in which the solution contains 5 to 20% polyvinyl alcohol by weight.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9723439A GB2331106A (en) | 1997-11-05 | 1997-11-05 | Use of polyvinyl alcohol as rust remover |
| PCT/IE1998/000090 WO1999023283A1 (en) | 1997-11-05 | 1998-11-04 | Rust remover and preventer |
| AU97580/98A AU9758098A (en) | 1997-11-05 | 1998-11-04 | Rust remover and preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9723439A GB2331106A (en) | 1997-11-05 | 1997-11-05 | Use of polyvinyl alcohol as rust remover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9723439D0 GB9723439D0 (en) | 1998-01-07 |
| GB2331106A true GB2331106A (en) | 1999-05-12 |
Family
ID=10821663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9723439A Withdrawn GB2331106A (en) | 1997-11-05 | 1997-11-05 | Use of polyvinyl alcohol as rust remover |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU9758098A (en) |
| GB (1) | GB2331106A (en) |
| WO (1) | WO1999023283A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007014967A1 (en) * | 2005-08-04 | 2007-02-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Residue-free removable etching agent |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628939B (en) * | 2018-12-20 | 2020-12-01 | 广州市泓硕环保科技有限公司 | Environment-friendly corrosion-resistant composition for normal-temperature rust removal of metal material |
| RU2738582C9 (en) * | 2020-07-17 | 2021-01-28 | Общество с ограниченной ответственностью Научно-Производственная Фирма «ПРАЙД» | Apparatus for detecting and removing metal inclusions on car paint coating surfaces |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079284A (en) * | 1960-11-30 | 1963-02-26 | Rinshed Mason Company | Method for cleaning surfaces |
| US3729423A (en) * | 1970-04-30 | 1973-04-24 | Mitsubishi Heavy Ind Ltd | Solid acid containing peeling type pickling composition |
| US3985584A (en) * | 1972-10-25 | 1976-10-12 | Oakite Products, Inc. | Metal protective coating compositions, their preparation and use |
| US4325744A (en) * | 1980-07-25 | 1982-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Method and composition for cleaning metal surfaces with a film-forming composition |
| WO1983003429A1 (en) * | 1982-03-31 | 1983-10-13 | Barabas, Eugene, S. | Rust removal process |
| US4424079A (en) * | 1982-03-31 | 1984-01-03 | Gaf Corporation | Rust removal process |
| US4586962A (en) * | 1983-09-27 | 1986-05-06 | Gaf Corporation | Surface cleaning process |
| US4609406A (en) * | 1984-09-05 | 1986-09-02 | Pennzoil Company | Rust conversion coatings |
| EP0091194B1 (en) * | 1982-03-31 | 1986-09-17 | Gaf Corporation | Thixotropic rust removal coating and process |
| US4622075A (en) * | 1984-10-15 | 1986-11-11 | Qo Chemicals, Inc. | Metal cleaning |
| US4824589A (en) * | 1986-08-04 | 1989-04-25 | Pennzoil Products Company | Rust converting and removing compositions |
| JPH02155725A (en) * | 1988-12-09 | 1990-06-14 | Nippon Mining Co Ltd | High molecular film laminated metal foil |
| JPH0693213A (en) * | 1992-09-09 | 1994-04-05 | Tetsuzo Tomioka | Rust preventing coating and copper-based glazing coating |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1072053B (en) * | 1959-12-24 | Metallgesellschaft Aktiengesellschaft, Frankfurt/M | Rust removal paste | |
| FR1107489A (en) * | 1954-05-07 | 1956-01-03 | Le Ministre De La Defense Nati | Improvements to processes and products such as those for pickling, in particular descaling, surfaces, in particular metallic |
| DE2603290B2 (en) * | 1976-01-29 | 1978-04-20 | Claus 6000 Frankfurt Hilgenstock | Process for cleaning metal, glass or plastic surfaces, in particular records |
| EP0047857A3 (en) * | 1980-09-13 | 1982-06-23 | Nukem GmbH | Process for decontaminating radioactively polluted surfaces |
| JPS60181175A (en) * | 1984-02-28 | 1985-09-14 | Moritoshi Saito | Strippable film-forming composition |
| CA1229779A (en) * | 1984-10-15 | 1987-12-01 | Ben R. Bogner | Metal cleaning |
| DE3446931C2 (en) * | 1984-12-21 | 1987-01-08 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen | Method for decontaminating the surface of an object |
| US4662075A (en) * | 1985-08-22 | 1987-05-05 | Magnum Diamond Reclamation, Inc. | Apparatus and method for setting knife blade depth |
| US5350445A (en) * | 1991-06-12 | 1994-09-27 | Nippon Paint Co., Ltd. | Hydrophilic coating composition and bath containing same |
-
1997
- 1997-11-05 GB GB9723439A patent/GB2331106A/en not_active Withdrawn
-
1998
- 1998-11-04 WO PCT/IE1998/000090 patent/WO1999023283A1/en active Application Filing
- 1998-11-04 AU AU97580/98A patent/AU9758098A/en not_active Abandoned
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079284A (en) * | 1960-11-30 | 1963-02-26 | Rinshed Mason Company | Method for cleaning surfaces |
| US3729423A (en) * | 1970-04-30 | 1973-04-24 | Mitsubishi Heavy Ind Ltd | Solid acid containing peeling type pickling composition |
| US3985584A (en) * | 1972-10-25 | 1976-10-12 | Oakite Products, Inc. | Metal protective coating compositions, their preparation and use |
| US4325744A (en) * | 1980-07-25 | 1982-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Method and composition for cleaning metal surfaces with a film-forming composition |
| EP0091194B1 (en) * | 1982-03-31 | 1986-09-17 | Gaf Corporation | Thixotropic rust removal coating and process |
| WO1983003429A1 (en) * | 1982-03-31 | 1983-10-13 | Barabas, Eugene, S. | Rust removal process |
| US4424079A (en) * | 1982-03-31 | 1984-01-03 | Gaf Corporation | Rust removal process |
| US4586962A (en) * | 1983-09-27 | 1986-05-06 | Gaf Corporation | Surface cleaning process |
| US4609406A (en) * | 1984-09-05 | 1986-09-02 | Pennzoil Company | Rust conversion coatings |
| US4622075A (en) * | 1984-10-15 | 1986-11-11 | Qo Chemicals, Inc. | Metal cleaning |
| US4824589A (en) * | 1986-08-04 | 1989-04-25 | Pennzoil Products Company | Rust converting and removing compositions |
| JPH02155725A (en) * | 1988-12-09 | 1990-06-14 | Nippon Mining Co Ltd | High molecular film laminated metal foil |
| JPH0693213A (en) * | 1992-09-09 | 1994-04-05 | Tetsuzo Tomioka | Rust preventing coating and copper-based glazing coating |
Non-Patent Citations (4)
| Title |
|---|
| WPI Accession no 70-08720R/06 & JP 45002082 B * |
| WPI Accession no 90-227888/27 & JP 02155725 A * |
| WPI Accession no 93-091742/11 & SU 1723200 A * |
| WPI Accession no 94-148100/18 & JP 06093213 A * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007014967A1 (en) * | 2005-08-04 | 2007-02-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Residue-free removable etching agent |
Also Published As
| Publication number | Publication date |
|---|---|
| AU9758098A (en) | 1999-05-24 |
| GB9723439D0 (en) | 1998-01-07 |
| WO1999023283A1 (en) | 1999-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |