US1949921A - Cleaning and protecting metals against rusting - Google Patents
Cleaning and protecting metals against rusting Download PDFInfo
- Publication number
- US1949921A US1949921A US620553A US62055332A US1949921A US 1949921 A US1949921 A US 1949921A US 620553 A US620553 A US 620553A US 62055332 A US62055332 A US 62055332A US 1949921 A US1949921 A US 1949921A
- Authority
- US
- United States
- Prior art keywords
- cleaning
- phosphoric acid
- ether
- rust
- metals against
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
-
- 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
- C23G1/083—Iron or steel solutions containing H3PO4
Definitions
- the present invention relates to improvements in the use of phosphoric acid for cleaning metals and protecting them from further rusting and comprises solutions of aqueous phosphoric acid it and others and a common, water soluble solvent for phosphoric acid and said ethers.
- sheet metal which has been given a thin coating of phosphate as, for example, by dipping in phosphoric acid or a n phosphate solution, has certain rust resistant properties that metal without this protective film of phosphate does not have.
- the simplest form of treatment is to immerse the piece of sheet into a bath of aqueous phosphoric acid or phosu phate.
- ordinary sheet metal as it comes from the fabricating operations is covered with scale, rust, etc., and has spots of grease and oil on its surfaces.
- the phosphoric acid while removing the rust and scale, is unable to m penetrate through the films of oil and grease and at such places the protective phosphate film is not formed. In further handling of the article, such grease spots are liable to rust and the paints or other coatings will not adhere as well to such unprotected spots.
- organic ethers preferably those which are liquid at and boil above room temperature
- phosphoric acid solutions allow the latter to form a protective o phosphate film at greasy or oily spots when the metal is treated with a phosphate solution.
- Ethers are the aryl or alkyl oxides of the general type R-O-R' wherein R and R are the same or difierent hydrocarbon radicals.
- a. watersoluble solvent in which both the aqueous phosphoric acid and (Ci. Mu -ii)
- I mix for instance 1 vol. phosphoric acid with 1 vol. denatured alcohol or similar solvent and 1% vol. water and from 1 to 5% of an ether such as for instance iso- propyl-ether.
- the amount of ether needed to allow the phosphoric acid to produce a continuous film over greasy metals is not particularly critical and the amounts above 5% could just as well be used though they would be less economical as amounts between 1 and 5% as stated above.
- a metal cleaning and rust preventing solution comprising 1 volume of 85% phosphoric acid, 1 volume denatured alcohol, 1% volume of water and from 1 to 5% of the total of isopropyl-ether.
- a metal cleaning and rust preventing soluthe ether is soluble, such as for instance methyl alcohol, ethyl alcohol, acetone, etc.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Detergent Compositions (AREA)
Description
?atented Mar. 5, 393 3 Wiliiam 3K. Schweitzer, East Elevelaml, @hio, as= signer to The Grasselli il'nemical il'ompany, @leveland, Ohio, a corporation oi Eelawere No Drawing. Application .iniy i, 1082, Serial No. 620,553
The present invention relates to improvements in the use of phosphoric acid for cleaning metals and protecting them from further rusting and comprises solutions of aqueous phosphoric acid it and others and a common, water soluble solvent for phosphoric acid and said ethers.
It is well known that sheet metal which has been given a thin coating of phosphate as, for example, by dipping in phosphoric acid or a n phosphate solution, has certain rust resistant properties that metal without this protective film of phosphate does not have. The simplest form of treatment is to immerse the piece of sheet into a bath of aqueous phosphoric acid or phosu phate. However, ordinary sheet metal as it comes from the fabricating operations is covered with scale, rust, etc., and has spots of grease and oil on its surfaces. The phosphoric acid, while removing the rust and scale, is unable to m penetrate through the films of oil and grease and at such places the protective phosphate film is not formed. In further handling of the article, such grease spots are liable to rust and the paints or other coatings will not adhere as well to such unprotected spots.
I have found that the addition of organic ethers, preferably those which are liquid at and boil above room temperature, to phosphoric acid solutions allow the latter to form a protective o phosphate film at greasy or oily spots when the metal is treated with a phosphate solution.
Ethers are the aryl or alkyl oxides of the general type R-O-R' wherein R and R are the same or difierent hydrocarbon radicals.
Among the more common, technically available ethers useful in the preparation of my novel cleaning solutions, I can mention ethyl ether which boils at 34.6" 0.; while this boiling point is somewhat low for the present purpose, ethyl o ether could be used. I prefer, however, to use} higher boiling ethers, such as iso-propyl-ether,
B. P. 69 0.; propyl-ether, B. P. 90.7 0., butyl ethers boiling above 100 0., ethyl-propyl-ether B. P. 63-64 0., ethylene glycol mono-ethyl-ether 5 B. P. 134.8 0. etc.
These ether-s are not completely miscible with aqueous phosphoric acid of the concentrations commonly used in rust protecting operations. I, therefore, emulsify the small amounts of ethers r quired in such phosphoric acid solutions.
More convenient is to add to the cleaning and rust preventing bath a. watersoluble solvent in which both the aqueous phosphoric acid and (Ci. Mu -ii) In preparing an efiicient metal cleaning and rust preventing bath, I mix for instance 1 vol. phosphoric acid with 1 vol. denatured alcohol or similar solvent and 1% vol. water and from 1 to 5% of an ether such as for instance iso-=propyl-ether.
The amount of ether needed to allow the phosphoric acid to produce a continuous film over greasy metals is not particularly critical and the amounts above 5% could just as well be used though they would be less economical as amounts between 1 and 5% as stated above.
Rusted and oily sheet iron, when dipped in such solutions, were readily wetted, the rust dissolved and the metal was coated with a thin and J even film of phosphate which imparted to the whole surface of the article an excellent rust resistance.
I claim:
1. A metal cleaning and rust preventing solution comprising 1 volume of 85% phosphoric acid, 1 volume denatured alcohol, 1% volume of water and from 1 to 5% of the total of isopropyl-ether.
2. A metal cleaning and rust preventing soluthe ether is soluble, such as for instance methyl alcohol, ethyl alcohol, acetone, etc.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US620553A US1949921A (en) | 1932-07-01 | 1932-07-01 | Cleaning and protecting metals against rusting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US620553A US1949921A (en) | 1932-07-01 | 1932-07-01 | Cleaning and protecting metals against rusting |
Publications (1)
Publication Number | Publication Date |
---|---|
US1949921A true US1949921A (en) | 1934-03-06 |
Family
ID=24486409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US620553A Expired - Lifetime US1949921A (en) | 1932-07-01 | 1932-07-01 | Cleaning and protecting metals against rusting |
Country Status (1)
Country | Link |
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US (1) | US1949921A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2744555A (en) * | 1950-03-31 | 1956-05-08 | Parker Rust Proof Co | Method of simultaneously phosphating and cleaning metal surfaces and composition therefor |
US4181622A (en) * | 1976-11-01 | 1980-01-01 | Gavin David C | Cleaning composition and method for removing marine accumulations from surfaces |
US4289638A (en) * | 1979-09-28 | 1981-09-15 | Svenson Bruce E | Metal treatment |
WO2015165600A1 (en) * | 2014-04-30 | 2015-11-05 | Rio Verwaltungs Ag | Treatment device and treatment method for pickling and phosphating metal parts |
WO2015176696A3 (en) * | 2014-05-23 | 2016-01-28 | Robert Ecker | Phosphating method and pickling and phosphating device for ferrous metals |
-
1932
- 1932-07-01 US US620553A patent/US1949921A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2744555A (en) * | 1950-03-31 | 1956-05-08 | Parker Rust Proof Co | Method of simultaneously phosphating and cleaning metal surfaces and composition therefor |
US4181622A (en) * | 1976-11-01 | 1980-01-01 | Gavin David C | Cleaning composition and method for removing marine accumulations from surfaces |
US4289638A (en) * | 1979-09-28 | 1981-09-15 | Svenson Bruce E | Metal treatment |
WO2015165600A1 (en) * | 2014-04-30 | 2015-11-05 | Rio Verwaltungs Ag | Treatment device and treatment method for pickling and phosphating metal parts |
JP2017514997A (en) * | 2014-04-30 | 2017-06-08 | リオ フェアヴァルトゥングス アクティエンゲゼルシャフト | Processing apparatus and processing method for pickling and phosphating metal parts |
RU2691443C2 (en) * | 2014-04-30 | 2019-06-13 | Рио Фервальтунгс Аг | Processing device and processing method for etching and phosphating of metal parts |
US10513784B2 (en) | 2014-04-30 | 2019-12-24 | Rio Verwaltungs Ag | Treatment device and treatment method for pickling and phosphating metal parts |
WO2015176696A3 (en) * | 2014-05-23 | 2016-01-28 | Robert Ecker | Phosphating method and pickling and phosphating device for ferrous metals |
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