US3729346A - High-pressure spray process for phosphating iron or steel surfaces - Google Patents
High-pressure spray process for phosphating iron or steel surfaces Download PDFInfo
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- US3729346A US3729346A US00145931A US3729346DA US3729346A US 3729346 A US3729346 A US 3729346A US 00145931 A US00145931 A US 00145931A US 3729346D A US3729346D A US 3729346DA US 3729346 A US3729346 A US 3729346A
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- spray
- phosphating
- pressure
- iron
- rust
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- Expired - Lifetime
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- 238000000034 method Methods 0.000 title abstract description 31
- 230000008569 process Effects 0.000 title abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 22
- 229910052742 iron Inorganic materials 0.000 title abstract description 11
- 239000007921 spray Substances 0.000 title description 25
- 229910000831 Steel Inorganic materials 0.000 title description 13
- 239000010959 steel Substances 0.000 title description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 229910019142 PO4 Inorganic materials 0.000 abstract description 16
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 12
- 239000010452 phosphate Substances 0.000 abstract description 9
- 238000005507 spraying Methods 0.000 abstract description 9
- 239000002253 acid Substances 0.000 abstract description 8
- 150000002739 metals Chemical class 0.000 abstract description 7
- 235000021317 phosphate Nutrition 0.000 description 14
- 238000000576 coating method Methods 0.000 description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 7
- 229910000165 zinc phosphate Inorganic materials 0.000 description 7
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 6
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 5
- 239000000080 wetting agent Substances 0.000 description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical class [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001784 detoxification Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 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
- 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
- C23C22/73—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 characterised by the process
- C23C22/76—Applying the liquid by spraying
Definitions
- the application of the treatment solutions is carried out at a spray-pressure of about 0.5-1.5 atmospheres gauge.
- Another object of the present invention is to provide a spray-process for phosphating surfaces of objects made of iron or steel which obviates a subsequent passivation treatment of the phosphated surfaces with solutions containing chromic acid or chromates.
- the high-pressure spray process according to the present invention produces satisfactory phosphate coatings over the entire indicated pressure range. Particularly favorable results with respect to stability against fly-rust and coating structure are obtained if the acid solutions of phosphates of film forming metals are sprayed upon the metal surfaces at a spray pressure in the range of 30 to 50 atmospheres gauge.
- the temperature at which the phosphating solution is applied to the metal surface lies advantageously in the range between 40 and C.
- the high-pressure spray process is caried out with the same layer-forming coating solutions which have heretofore been conventionally used for spray-phosphating at low pressure.
- the acid solutions contain phosphate ions and cations of polyvalent metals, such as magnesium, manganese, cadmium, cobalt, nickel and lead, individually or in admixture with each other. Because of the particularly favorable properties of the phosphate layers prepared therewith in regard to corrosion stability and improved lacquer adhesion, those solutions are preferably used which contain zinc or calcium as layer-forming cations, but also those solutions are suitable which contain zinc and calcium ions together in various atomic weight ratios. For acceleration of the coating formation, customary accelerators are added to the phosphating solutions.
- oxidizing agents such as nitrites, nitrates, chlorates, perborates or hydrogen peroxide, or with the combination nitrite/ nitrate, nitrite/chlorate or nitrate/perborate.
- the phosphating solutions used in the high-pressure spray process according to the present invention contain phosphate ions, polyvalent metal ions and accelerators in the customary concentrations. Also, the ratio of free acid to bound acid, as well as the Working pH, lie within the conventional limits.
- cleaning and phosphating may be carried out in one working step.
- non-ionic wetting agents such as reaction products of the ethylene oxide with fatty alcohols, alkylphenols, fatty amines or polyoxypropyleneglycols, are added to the acid phosphating solution.
- concentration of the wetting agents in the phosphating solution lies within the customary limits of 0.1 to 5 gm./
- the phosphating of iron and steel surfaces by the highpressnre spray process can be carried out in automatic installations as well as with the aid of manual spraying equipment.
- the iron and steel surfaces phosphated by the process pursuant to the present invention are resistant against fly-rust, so that a subsequent treatment with chromic acid or chromate solutions is unnecessary.
- the phosphate layers produced thereby are more closed and have a finer crystals structure than phosphate coatings produced with the same phosphating solution, but at a low spraying pressure by known processes; with respect to corrosion protection and lacquer adhesion they are at least equivalent to the latter.
- the high-pressure spray process according to the present invention has the additional advantage relative to the known low-pressure spray processes that it does not require a subsequent passivation of the phosphatized metal surfaces. Consequently not only the chromic acid passivation step, but also the required work-physiological protective measures and the detoxification of the waste liquids are obviated. This is particularly advantageous in cases where ferrous metal surfaces are to be phosphated by manual spraying; thus, the layer-forming phosphating treatment can now also be applied where its application was heretofore not feasible with regard to Work-physiology and waste liquid detoxification, as well as to fixed metal structures, such as overhead eelctrical transmission line towers, bridges, etc.
- the phosphated bodies were rinsed with tap water, then with completely desalted water and finally dried in a hot air stream.
- This treatment provided the steel bodies with a homogeously formed, dense zinc phosphate layer.
- the treated surface showed no deposit of fiy-rust.
- a non-ionic wetting agent (addition product of 1 mol of nonylphenol to 9 mols of ethylene oxide) 1.6
- the phosphate-coated iron sheets were electrophoret- 4 ically lacquered and subjected to the salt-spray test according to ASTM B 117-64 with cross-cut. After 350 hours the following values were obtained:
- a rust-protective phosphate coating to a ferric metal surface, which comprises spraying an aqueous phosphoric acid solution of phosphates of layer-forming metals selected from the group consisting of zinc phosphate, calcium phosphate and mixtures thereof, in the presence of oxidizing agent accelerators under pressure onto said surface, the improvement which consists in that the spray pressure is from 10 to 100 atmospheres gauge.
- aqueous phosphoric acid solution of phosphates is an aqueous phosphoric acid solution of zinc phosphate.
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- 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)
- Paper (AREA)
Abstract
A PROCESS FOR APPLYING RUST-PREVENTING PHOSPHATE COATINGS TO SURFACES OF OBJECTS MADE OF IRON OR STEEL BY SPRAYING SAID OBJECTS WITH AN ACID SOLUTION OF PHOSPHATES OF LAYER-FORMING METALS UNDER A SPRAY PRESSURE OF 10 TO 100 ATMOSPHERES GAUGE.
Description
United States Patent Ofice 3,729,346 Patented Apr. 24, 1973 HIGH-PRESSURE SPRAY PROCESS FOR PHOS- PHATIN G IRON OR STEEL SURFACES Hans Gotta, Weiden, and Norbert Schulz, Oberdollendorf, Germany, assignors to Gerhard Collardin GmbH, Cologne-Ehrenfeld, Germany N Drawing. Filed May 21, 1971, Ser. No. 145,931 Claims priority, application Austria, June 1, 1970,
Int. Cl. C23f 7/10 US. Cl. 148--6.15 Z 7 Claims ABSTRACT OF THE DISCLOSURE A process for applying rust-preventing phosphate coatings to surfaces of objects made of iron or steel by spraying said objects with an acid solution of phosphates of layer-forming metals under a spray pressure of 10 to 100 atmospheres gauge.
BACKGROUND OF THE INVENTION Processes for the application of phosphate coatings on iron and steel surfaces with the aid of acid solutions of phosphates of polyvalent metals, which may contain oxidizers or other accelerators for accelerating the coating formation, have been known for a long time. According to the method of application, these processes may be differentially classified as dipping and spraying processes. Particularly the latter are suitable for the treatment of metal objects in automatic installations in which the cleaning, phosphating and after-treatment are carried out in a continuous work sequence. Moreover, phosphating processes by the spray-method may be applied wherever treatment in dipping, moving belt or automatic spraying installations is not feasible, such as in the case of bulky metal structures or small numbers of pieces. On these cases the treatment solutions are applied to the metal surface with the aid of manually guided spray nozzles.
In the known spray processes for phosphatizing, the application of the treatment solutions is carried out at a spray-pressure of about 0.5-1.5 atmospheres gauge.
The known spray-processes, however, have an important disadvantage. Iron and steel surfaces which have been phosphated in this manner with solutions of phosphates of layer-forming metals have a strong tendency to develop a deposit of so-called fly-rust. This is especially the case if the phosphating treatment is carried out with manually guided spray guns. For this reason the phosphated metal surfaces must be subsequently passivated with solutions containing chromic acid or chromates, in order to prevent the formation of fly-rust. However, the use of chromic acid or chromates requires considerable work-physiological protective measures and a corresponding treatment of the waste liquid which can only be carried out in expensive detoxification installations. By virtue of these circumstances the application possibilities of the known spray-methods of phosphating ferrous metal surfaces with manually guided spray guns operating at relatively low pressures are very limited.
OBJECTS OF THE INVENTION It is an object of the instant invention to provide an improved process of phosphating surfaces of objects made of iorn or steel by the spray-method which avoids the deposit of fly-rust on the phosphated surfaces.
Another object of the present invention is to provide a spray-process for phosphating surfaces of objects made of iron or steel which obviates a subsequent passivation treatment of the phosphated surfaces with solutions containing chromic acid or chromates.
Still other objects and advantages of the invention will become apparent as the description thereof proceeds.
THE INVENTION We have discovered that the above objects are achieved by applying a conventional phosphating solution with the aid of a spray gun under a presure of 10 to 100 atmospheres gauge.
The high-pressure spray process according to the present invention produces satisfactory phosphate coatings over the entire indicated pressure range. Particularly favorable results with respect to stability against fly-rust and coating structure are obtained if the acid solutions of phosphates of film forming metals are sprayed upon the metal surfaces at a spray pressure in the range of 30 to 50 atmospheres gauge.
The temperature at which the phosphating solution is applied to the metal surface lies advantageously in the range between 40 and C.
The high-pressure spray process is caried out with the same layer-forming coating solutions which have heretofore been conventionally used for spray-phosphating at low pressure. The acid solutions contain phosphate ions and cations of polyvalent metals, such as magnesium, manganese, cadmium, cobalt, nickel and lead, individually or in admixture with each other. Because of the particularly favorable properties of the phosphate layers prepared therewith in regard to corrosion stability and improved lacquer adhesion, those solutions are preferably used which contain zinc or calcium as layer-forming cations, but also those solutions are suitable which contain zinc and calcium ions together in various atomic weight ratios. For acceleration of the coating formation, customary accelerators are added to the phosphating solutions. Particularly advantageous is the acceleration with oxidizing agents, such as nitrites, nitrates, chlorates, perborates or hydrogen peroxide, or with the combination nitrite/ nitrate, nitrite/chlorate or nitrate/perborate.
The phosphating solutions used in the high-pressure spray process according to the present invention contain phosphate ions, polyvalent metal ions and accelerators in the customary concentrations. Also, the ratio of free acid to bound acid, as well as the Working pH, lie within the conventional limits.
Insofar as the objects to be treated are not exceedingly soiled, cleaning and phosphating may be carried out in one working step. In this case non-ionic wetting agents, such as reaction products of the ethylene oxide with fatty alcohols, alkylphenols, fatty amines or polyoxypropyleneglycols, are added to the acid phosphating solution. The concentration of the wetting agents in the phosphating solution lies within the customary limits of 0.1 to 5 gm./
iter.
The phosphating of iron and steel surfaces by the highpressnre spray process can be carried out in automatic installations as well as with the aid of manual spraying equipment.
The iron and steel surfaces phosphated by the process pursuant to the present invention are resistant against fly-rust, so that a subsequent treatment with chromic acid or chromate solutions is unnecessary. The phosphate layers produced thereby are more closed and have a finer crystals structure than phosphate coatings produced with the same phosphating solution, but at a low spraying pressure by known processes; with respect to corrosion protection and lacquer adhesion they are at least equivalent to the latter.
The high-pressure spray process according to the present invention has the additional advantage relative to the known low-pressure spray processes that it does not require a subsequent passivation of the phosphatized metal surfaces. Consequently not only the chromic acid passivation step, but also the required work-physiological protective measures and the detoxification of the waste liquids are obviated. This is particularly advantageous in cases where ferrous metal surfaces are to be phosphated by manual spraying; thus, the layer-forming phosphating treatment can now also be applied where its application was heretofore not feasible with regard to Work-physiology and waste liquid detoxification, as well as to fixed metal structures, such as overhead eelctrical transmission line towers, bridges, etc.
The following examples further illustrate the present invention and will enable others skilled in the art to understand it more completely. It should be understood, however, that the invention is not limited solely to the particular examples given below.
EXAMPLE 1 Auto bodies made of sheet steel were sprayed with an aqueous zinc phosphate solution of the following composition:
Gm./liter Zn(H PO 8 NaH PO 2.1 H PO (100%) 0.7 NaNO 5.9 NaNO 0.4 A non-ionic wetting agent (addition product of 1 mol of nonylphenol to 9 mols of ethylene oxide) 5 The temperature of the solution was 60 to 63 C., and the spray pressure was 40 atmospheres gauge. The solution was sprayed from two manual spray guns with an output of 6 to 7 liters/minute each. The treating time for a body of about 60 m. surface area was 12 minutes.
Subsequently, the phosphated bodies were rinsed with tap water, then with completely desalted water and finally dried in a hot air stream.
This treatment provided the steel bodies with a homogeously formed, dense zinc phosphate layer. The treated surface showed no deposit of fiy-rust.
For comparison, auto bodies made of sheet steel were phosphated in the same manner and under the same conditions, but with a spray pressure of 4 atmospheres gauge. After this treatment the steel surfaces also showed a well-formed zinc phosphate layer. However, so much fly-rust had formed that the layers were not suitable as a base for subsequent electrophoretic lacquering.
EXAMPLE 2 Iron sheets were manually sprayed at pressures of 1.5, 6 and 45 atmospheres gauge, respectively, with an aqueous zinc phosphate solution which had the following composition:
A non-ionic wetting agent (addition product of 1 mol of nonylphenol to 9 mols of ethylene oxide) 1.6
Subsequently, the-sheets were rinsed with tap water,
then with completely desalted Water, and dried in a hot air stream.
The phosphate-coated iron sheets were electrophoret- 4 ically lacquered and subjected to the salt-spray test according to ASTM B 117-64 with cross-cut. After 350 hours the following values were obtained:
(1) Spray pressure 1.5 atmospheres gauge Degree of blistering:
DIN 53 20 9: m S/g 5 ASTM D 714-56: 2 D Rust in the cross-cut: 5-12 mm.
(2) Spray pressure 6 atmospheres gauge Degree of blistering:
DIN 53 209: In 4/g 5 ASTM D 714-56; 2 M D Rust in the cross-cut: 4-10 mm.
(3) Spray pressure 45 atmospheres gauge Degree of blistering:
DIN 53 209: m 2/g 2 ASTM D 714-56: 8 F Rust in the cross-cut: 2-3 mm.
While the present invention has been illustrated with the aid of certain specific embodiments thereof, it will be readily apparent to others skilled in the art that the invention is not limited to these particular embodiments, and that various changes and modifications may be made without departing from the spirit of the invention or the scope of the appended claims.
We claim:
1. In the process of applying a rust-protective phosphate coating to a ferric metal surface, which comprises spraying an aqueous phosphoric acid solution of phosphates of layer-forming metals selected from the group consisting of zinc phosphate, calcium phosphate and mixtures thereof, in the presence of oxidizing agent accelerators under pressure onto said surface, the improvement which consists in that the spray pressure is from 10 to 100 atmospheres gauge.
2. The process according to claim 1, wherein said spray pressure is from 30 to 50 atmospheres gauge.
3. The process according to claim 1, wherein the temperature of said solution is from 40 to C.
4. The process according to claim 1, wherein said solution contains a wetting agent.
5. The process according to claim 1, wherein a manually operated spray gun is used for spraying.
6. The process according to claim 1, wherein said aqueous phosphoric acid solution of phosphates is an aqueous phosphoric acid solution of zinc phosphate.
7. The process according to claim 6, wherein said aqueous phosphoric acid solution of zinc phosphate contains a nitrite/nitrate combination oxidizing agent accelerator.
References Cited UNITED STATES PATENTS 3,615,912 10/1971 Dittel et a1. 148-615 R 3,684,588 8/1972 Curran 148-615 Z RALPH S. KENDALL, Primary Examiner US. Cl. X.R. 148-6.15 R
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT487270 | 1970-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3729346A true US3729346A (en) | 1973-04-24 |
Family
ID=3569322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00145931A Expired - Lifetime US3729346A (en) | 1970-06-01 | 1971-05-21 | High-pressure spray process for phosphating iron or steel surfaces |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3729346A (en) |
| DE (1) | DE2123966C3 (en) |
| FR (1) | FR2093957B1 (en) |
| GB (1) | GB1321003A (en) |
| SE (1) | SE366347B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017335A (en) * | 1975-10-30 | 1977-04-12 | Economics Laboratory, Inc. | Liquid phosphatizing composition and use thereof |
| US4060433A (en) * | 1976-03-05 | 1977-11-29 | Economics Laboratory, Inc. | Foam phosphatizing method and composition |
| US4108690A (en) * | 1976-04-05 | 1978-08-22 | Amchem Products, Inc. | Method for producing an amorphous, light weight calcium phosphate coating on ferrous metal surfaces |
| US4384900A (en) * | 1979-12-21 | 1983-05-24 | Gerhard Collardin Gmbh | Method of treating metal surfaces prior to phosphatization |
| CN103451638B (en) * | 2013-09-02 | 2015-10-28 | 东南大学 | A kind of pressure parco-lubrizing strengthening steel material surface resistance of oxidation |
| EP4249635A1 (en) * | 2022-03-25 | 2023-09-27 | Hamilton Sundstrand Corporation | Application of type ii chemical conversion coatings (cccs) using foaming agents |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811514B2 (en) * | 1979-05-02 | 1983-03-03 | 日本ペイント株式会社 | How to protect metal surfaces |
| IT1302593B1 (en) * | 1998-10-02 | 2000-09-29 | Abb Ricerca Spa | METALLIC SHEETS PRETREATMENT PROCESS INTENDED FOR PAINTING |
| CN116356269A (en) * | 2021-12-28 | 2023-06-30 | 无锡互盛智能科技有限公司 | Coating process of metal product with ultra-long service life |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1042545A (en) * | 1951-10-03 | 1953-11-02 | Process of phosphating, deoxidation and passivation of metal surfaces by steam |
-
1971
- 1971-05-04 SE SE05782/71A patent/SE366347B/xx unknown
- 1971-05-07 GB GB1379271*[A patent/GB1321003A/en not_active Expired
- 1971-05-14 DE DE2123966A patent/DE2123966C3/en not_active Expired
- 1971-05-21 US US00145931A patent/US3729346A/en not_active Expired - Lifetime
- 1971-06-01 FR FR7119712A patent/FR2093957B1/fr not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017335A (en) * | 1975-10-30 | 1977-04-12 | Economics Laboratory, Inc. | Liquid phosphatizing composition and use thereof |
| US4060433A (en) * | 1976-03-05 | 1977-11-29 | Economics Laboratory, Inc. | Foam phosphatizing method and composition |
| US4108690A (en) * | 1976-04-05 | 1978-08-22 | Amchem Products, Inc. | Method for producing an amorphous, light weight calcium phosphate coating on ferrous metal surfaces |
| US4384900A (en) * | 1979-12-21 | 1983-05-24 | Gerhard Collardin Gmbh | Method of treating metal surfaces prior to phosphatization |
| CN103451638B (en) * | 2013-09-02 | 2015-10-28 | 东南大学 | A kind of pressure parco-lubrizing strengthening steel material surface resistance of oxidation |
| EP4249635A1 (en) * | 2022-03-25 | 2023-09-27 | Hamilton Sundstrand Corporation | Application of type ii chemical conversion coatings (cccs) using foaming agents |
| US12486580B2 (en) | 2022-03-25 | 2025-12-02 | Hamilton Sundstrand Corporation | Application of type II chemical conversion coatings (CCCS) using foaming agents |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2123966A1 (en) | 1971-12-16 |
| FR2093957A1 (en) | 1972-02-04 |
| DE2123966C3 (en) | 1980-03-13 |
| SE366347B (en) | 1974-04-22 |
| GB1321003A (en) | 1973-06-20 |
| DE2123966B2 (en) | 1979-06-21 |
| FR2093957B1 (en) | 1973-11-23 |
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