US3116177A - Process for degreasing and oxalating in a single spray stage - Google Patents
Process for degreasing and oxalating in a single spray stage Download PDFInfo
- Publication number
- US3116177A US3116177A US62903A US6290360A US3116177A US 3116177 A US3116177 A US 3116177A US 62903 A US62903 A US 62903A US 6290360 A US6290360 A US 6290360A US 3116177 A US3116177 A US 3116177A
- Authority
- US
- United States
- Prior art keywords
- per liter
- concentration
- degreasing
- grams per
- chromic acid
- 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
- C23C22/46—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 oxalates
-
- 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
- C23C22/46—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 oxalates
- C23C22/47—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 oxalates containing also phosphates
-
- 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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
Definitions
- This invention relates to an improvement in a process for pre-treating a metal surface, particularly iron, or steel, or other ferrous metal or alloy, prior to applying paint thereto.
- the first step of such prior processes comprises a spray degreasing by means of alkali, or an organic solvent emulsion. This is followed by a washing step, and successively, in a third step, by treatment with phosphate or oxalate bath. The steps of washing and passivation then follow.
- This multistage process requires a complicated plant, and involves high operating costs.
- Another great advantage of the present invention is the obtaining of a surface which is especially suitable for anchorage of the after-applied coat of paint, by the removal of the layer of excess oxalate after treating with a diluted chromic acid solution.
- the material is degreased and coated with a layer of oxalate, then it is washed and subjected to the action of a diluted chromic acid solution whose concentration is between 0.05 and 5%, preferably between 0.5 and 2%.
- the chromic acid solution removes a large part of the oxalate layer, leaving a metallic, dark grey colored, surface that is extraordinarily effective for anchorage of paint.
- the material After treating with the chromic acid solution, the material is rinsed to remove the chromic acid excess.
- Example I A bath is prepared containing in 1 liter water:
- This mixture is sprayed upon a degreased iron plate, to produce oxalate layers.
- oxalate layers are obtained of the same quality as above on sheet iron not previously degreased.
- the bath can be used until it has treated 4 m plate per liter of bath, with unvarying results. In this way, three operating phases are suflicient (degreasing-oxalation, +washing +passivation) to obtain a normal oxalate layer.
- Example II Upon employing a bath identical with that described in Example I, but adding 15 grams per liter of an aqueous kerosene solution, amorphous oxalate layers of the normal type are obtained, in a single stage treatment.
- the materials so treated are rinsed in running water, subjected to the action of a chromic acid solution, for example for one minute and finally again quickly rinsed to remove the excess chromic acid.
- the surface so obtained is free of any apparent surface layer, is uniformly grey colored, and is especially suitable for the anchorage of the successively applied paint.
- the material treated and painted in such a manner may even be deformed, without any detachment of the paint occurring.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1735659 | 1959-10-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3116177A true US3116177A (en) | 1963-12-31 |
Family
ID=11150084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US62903A Expired - Lifetime US3116177A (en) | 1959-10-19 | 1960-10-17 | Process for degreasing and oxalating in a single spray stage |
Country Status (8)
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5669978A (en) * | 1995-07-03 | 1997-09-23 | Brown; Mattie L. | Method for removing scale from silver articles using an aqueous oxalic acid solution |
Citations (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 |
DE943152C (de) * | 1952-04-03 | 1956-05-09 | Hoechst Ag | Verfahren zur Herstellung von Korrosionsschutzschichten auf Metallen, insbesondere Eisen und Stahl |
US2800422A (en) * | 1953-04-20 | 1957-07-23 | Piccinelli Achille | Process for rust-proofing and passivating iron articles |
US2863791A (en) * | 1955-04-08 | 1958-12-09 | Montedison Spa | Production of oxalate coatings on iron and steel |
US2987428A (en) * | 1958-03-14 | 1961-06-06 | Amchem Prod | Metal coating composition and method of coating steel |
-
0
- LU LU39302D patent/LU39302A1/xx unknown
- NL NL256875D patent/NL256875A/xx unknown
-
1960
- 1960-10-17 CH CH1160060A patent/CH393029A/de unknown
- 1960-10-17 GB GB35539/60A patent/GB898859A/en not_active Expired
- 1960-10-17 US US62903A patent/US3116177A/en not_active Expired - Lifetime
- 1960-10-18 BE BE596132A patent/BE596132A/fr unknown
- 1960-10-18 DE DE19601796317 patent/DE1796317A1/de active Pending
- 1960-10-18 ES ES0262013A patent/ES262013A1/es not_active Expired
Patent Citations (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 |
DE943152C (de) * | 1952-04-03 | 1956-05-09 | Hoechst Ag | Verfahren zur Herstellung von Korrosionsschutzschichten auf Metallen, insbesondere Eisen und Stahl |
US2800422A (en) * | 1953-04-20 | 1957-07-23 | Piccinelli Achille | Process for rust-proofing and passivating iron articles |
US2863791A (en) * | 1955-04-08 | 1958-12-09 | Montedison Spa | Production of oxalate coatings on iron and steel |
US2987428A (en) * | 1958-03-14 | 1961-06-06 | Amchem Prod | Metal coating composition and method of coating steel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5669978A (en) * | 1995-07-03 | 1997-09-23 | Brown; Mattie L. | Method for removing scale from silver articles using an aqueous oxalic acid solution |
Also Published As
Publication number | Publication date |
---|---|
LU39302A1 (US06262066-20010717-C00315.png) | |
DE1796317A1 (de) | 1973-05-03 |
BE596132A (fr) | 1961-04-18 |
GB898859A (en) | 1962-06-14 |
CH393029A (de) | 1965-05-31 |
ES262013A1 (es) | 1961-05-16 |
NL256875A (US06262066-20010717-C00315.png) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2164042A (en) | Art of producing phosphate coatings on surfaces of iron, zinc, or alloys thereof | |
US2329065A (en) | Corrosion resistant coating for metal surfaces | |
US2298280A (en) | Treatment of metal | |
EP0175606A1 (fr) | Procédé de traitement par conversion chimique de substrats en zinc ou en l'un de ses alliages, concentré et bain utilisés pour la mise en oeuvre de ce procédé | |
US2548419A (en) | Method for production of lustrous zinc | |
US2132883A (en) | Method of coating ferrous metal with a water insoluble metallic phosphate | |
US2548420A (en) | Method of producing lustrous zinc | |
US2244526A (en) | Process of treating metal surfaces | |
US3116177A (en) | Process for degreasing and oxalating in a single spray stage | |
US3489625A (en) | Process for metal surface conditioning | |
US2288007A (en) | Corrosion resistant film on zinc | |
US2271375A (en) | Process of coating metal surfaces | |
US2463496A (en) | Accelerating phosphate coating with indigoid compounds | |
US3615892A (en) | Composition and method for black coating on metals | |
US2272216A (en) | Method of coating copper and its alloys | |
US1895568A (en) | Rust proofing iron and steel articles | |
DE2016397A1 (de) | Verfahren und Lösung für die Beschleunigung der Aktivierung von Kunststoffoberflächen beim stromlosen Metallbeschichten derselben | |
US1938961A (en) | Method of preventing cleaned metal from rusting | |
US2111199A (en) | Flash copper coating | |
US3736157A (en) | Electroless copper tin plating solution and process | |
US2935423A (en) | Process for applying a protective coating to a magnesium surface | |
US2795518A (en) | Process for treating steel, zinc, and aluminum to increase corrosion resistance | |
US3915812A (en) | Method of manufacturing tinned plates having high corrosion resistant property | |
US3380921A (en) | Process for desmutting metal | |
US3505129A (en) | Chemical coating process for metal |