US3395052A - Pretreating process for phosphatetreating steel sheets and plated steel sheets - Google Patents

Pretreating process for phosphatetreating steel sheets and plated steel sheets Download PDF

Info

Publication number
US3395052A
US3395052A US395285A US39528564A US3395052A US 3395052 A US3395052 A US 3395052A US 395285 A US395285 A US 395285A US 39528564 A US39528564 A US 39528564A US 3395052 A US3395052 A US 3395052A
Authority
US
United States
Prior art keywords
phosphate
steel sheets
pretreating
liquid
steel sheet
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
Application number
US395285A
Inventor
Yonezaki Shigeru
Kamada Minoru
Terayama Kazukiyo
Kanechika Katsunori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zawata Iron and Steel Co Ltd
Original Assignee
Zawata Iron and Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zawata Iron and Steel Co Ltd filed Critical Zawata Iron and Steel Co Ltd
Application granted granted Critical
Publication of US3395052A publication Critical patent/US3395052A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C23C22/78—Pretreatment of the material to be coated

Definitions

  • ABSTRACT OF THE DISCLOSURE provides for a method of phosphatizing the surface of steel sheets or plated steel sheets, wherein said method is preceded by a pretreating process,
  • the pretreating process comprises applying to the surface of said steel sheets, a liquid suspension of an insoluble phosphate selected from the group consisting of zinc phosphate, calcium phosphate, magnesium phosphate, ferrous phosphate, ferric phosphate, and aluminum phosphate.
  • This invention relates generally to pretreating processes for phosphate-treating the surface of ferrous metals and more particularly to economical pretreating processes for depositing phosphate films on steel sheets or plated steel sheets very quickly and compactly.
  • the present invention is a pretreating process to be carried out before phosphate films are applied to steel sheets or plated steel sheets such as galvanized steel sheets and comprises treating the surfaces of such steel sheets or plated steel sheets with a suspension of an insoluble phosphate of bivalent or trivalent metal. If such pretreatment is applied, in the subsequent phosphate treatment, a phosphate film will be produced within a very short time and will be very fine and compact.
  • the pretreatment of the surface is so important that, if no pretreatment is applied at all, no film will be produced at all or only a phosphate film of coarse crystals will be obtained in the subsequent phosphate treatment. It seems to be substantially ineffective to pretreatment to use a solution prepared by dissolving such soluble phosphate as, for example, Zn(H PO ).
  • a solution prepared by dissolving such soluble phosphate as, for example, Zn(H PO
  • the prior art has adopted a pretreating liquid comprising a solution of soluble sodium phosphate containing titanium.
  • the ingredient contributing to the formation of a phosphate film of fine crystals is the titanium in the solution.
  • pretreating solution will be aged, that is, the coating weight of phosphate will increase and the crystal grains of the phosphate film will become coarse. As a result of the aging process the soluble phosphate in such pretreating liquid is not effective.
  • the pretreating liquid In order to obtain a suitable phosphate film by the above described prior art methods, the pretreating liquid must be frequently replaced so that a fixed amount of titanium may be always present. Thus this conventional pretreating liquid has decided disadvantages in that it is troublesome and costly.
  • the concentration States Patent 0 3,395,5Z Patented July 30, 1968 of the liquid must be high and therefore the unit price of the product is much higher than that of the present invention. Even if the concentration of the liquid is kept high and the steel sheet is treated in said pretreating liquid and then further in a phosphate-treating liquid, the crystal size of the phosphate film will be almost invariably above 3 and rarely below 1 1..
  • the prior art also utilizes a mechanical pretreating process wherein no pretreating liquid is used therein. According to this process, the surface of a steel sheet is rubbed with a proper rubbing tool before it is dipped in a phosphate-treating liquid.
  • a mechanical pretreating process wherein no pretreating liquid is used therein. According to this process, the surface of a steel sheet is rubbed with a proper rubbing tool before it is dipped in a phosphate-treating liquid.
  • a device of a considerably high precision is required. Therefore, it can not be recommended.
  • the present invention is designed to eliminate the defects of the prior art processes as described above.
  • a suspension of an insoluble phosphate of a bivalent or trivalent metal is used so that the surface of a steel sheet may be mechanically rubbed and ground, and fine crystal nuclei of the phosphate may be then imparted to the surface thereof.
  • fine crystals of the phosphate may be produced uniformly on the surface of the steel sheet within a very short time.
  • An object of the present invention is to provide a pretreating process for the phosphate treatment of metal surfaces wherein a favorable fine compact phosphate film can be formed within a very short time on the surface of a steel sheet or a plated steel sheet such as a galvanized steel sheet.
  • Another object of the present invention is to provide a pretreating liquid which is economical and easy to apply by spraying or dipping in a pretreating process for phosphate-treating steel sheets or plated steel sheets.
  • the insoluble phosphate of the bivalent metal is zinc phosphate, calcium phosphate, magnesium phosphate or ferrous phosphate and that of the trivalent metal is ferric phosphate or aluminum phosphate.
  • a low concentration up to about 3 g./liter
  • the suspension is sprayed onto the surface of a steel sheet or a plated steel sheet under a high pressure, a favorable uniforrr pretreated surface will be obtained.
  • the steel sheet or plated steel sheet is dipped in the liquid or, after the dipping, the deposited liquid is pressed or rubbed onto the surface of the sheet with a roll or the like.
  • the favorable concentration of the suspension is more than 1 g./liter.
  • the higher the concentration the better the result.
  • a concentration of more than 5 g./liter is preferable.
  • a proper concentration may be selected in response to the performances of the nozzle.
  • a spraying pressure of more than 0.5 kg./cm. is preferable.
  • the higher the spraying pressure the better the result.
  • the longer the spraying time the better the result.
  • a spraying time of less than 1 minute is sulficient.
  • the spraying pressure, the spraying time and the concentration of the suspension are so closely correlated with one another that, when the spraying pressure is restricted, and the spraying time is made longer, a favorable result will be obtained and, when the spraying time is restricted, and the concentration of the suspension is elevated, a favorable result will also be obtained.
  • the preferable pH of the suspension is slightly acid or alkaline at about 3 to 10. Outside this range, the steel sheet will corrode or will dissolve in the phosphate with an unfavorable result. It is proper to adjust the pH with phosphoric acid or sodium phosphate.
  • the bivalent or trivalent metal which is the principal agent in the present pretreating process may be used as crushed from crystals or as prepared from a soluble salt of the bivalent or trivalent metal or by adding a phosphate to the carbonate or oxide of such metal.
  • the treatment may be applied at to 90 C.
  • the crystal size of the obtained phosphate film will be so coarse as to be more than 100w but, when the present pretreatment is applied, the crystal size will be so fine as to be 2a or less.
  • the time required to complete the phosphate treatment will be generally less than 2 minutes when the conventional pretreating process is carried out but will be so short as to be specifically less than 10 seconds when the present pretreating process is carried out.
  • Example 1 A fabricated steel sheet was dipped in an alkali solution so as to be degreased, was washed with water and was sprayed under the following conditions:
  • the time required to complete the phosphate treatment was only 10 seconds when the pretreatment of the present invention had been applied but was more than 5 minutes, sometimes no film being produced, when no pretreatment had been applied at all.
  • the crystal size of the produced phosphate film was so fine as to be 2 when the present pretreatment had been applied.
  • Example 2 An electrogalvanized steel sheet was sprayed under the following conditions:
  • Zinc phosphate 'g./liters 25 Liquid temperature C. 30 pH 7.8 Spraying pressure Kg./cm. 2.5 Spraying time seconds 5 After the spraying treatment, the sheet was squeezed with a roll and was soon treated with phosphate-treating bath.
  • the time required to complete the phosphate treatment was about 10 seconds and the crystal size of the produced phosphate film was so fine as to be l t.
  • Example 3 A hot-dipped galvanized steel sheet was dipped under the following conditions:
  • the sheet was squeezed with a rubber roll, was washed with water and was treated with phosphate-treating bath.
  • the time required to complete the phosphate treatment was about 15 seconds and the crystal size of the produced phos phate film was so fine as to be 2,4.
  • the pretreating process comprises applying to the surface of said steel sheets, a liquid aqueous suspension of an insoluble phosphate selected from the group consisting of zinc phosphate, calcium phosphate, magnesium phosphate, ferrous phosphate, ferric phosphate, and aluminum phosphate, in which said liquid suspension contains more than 1 g./l. of said phosphate and wherein the pH of the liquid is adjusted to from 3 to 10.
  • the pretreating process comprises dipping said steel sheets in a liquid aqueous suspension, containing at least 1 g./l. of zinc phosphate at a liquid temperature of 10 to 90 C. and at a pH of 3 to 10, then squeezing the sheets with a roll.
  • the improvement accord ing to which the pretreating process comprises spraying 5 6 a liquid aqueous suspension, containing at least 1 g./l. of 2,357,269 8/ 1944 Russell et al 1486.15 X zinc phosphate, at a liquid temperature of 10 to 90 C., 2,479,423 8/1949 Snyder 148-6.15 onto the surface of said steel sheets, said spraying pres- 2,501,846 3/1950 Gilford 1486.15 sure being at least 0.5 kg./cm. and the pH of said liquid 2,514,149 7/ 1950 Amundsen 148-6.15 bemg mm 3 5 FOREIGN PATENTS References Cited 21,870 10/ 1963 Japan,

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)

Description

Unit
ABSTRACT OF THE DISCLOSURE The present invention provides for a method of phosphatizing the surface of steel sheets or plated steel sheets, wherein said method is preceded by a pretreating process,
the improvement according to which the pretreating process comprises applying to the surface of said steel sheets, a liquid suspension of an insoluble phosphate selected from the group consisting of zinc phosphate, calcium phosphate, magnesium phosphate, ferrous phosphate, ferric phosphate, and aluminum phosphate.
This invention relates generally to pretreating processes for phosphate-treating the surface of ferrous metals and more particularly to economical pretreating processes for depositing phosphate films on steel sheets or plated steel sheets very quickly and compactly.
The present invention is a pretreating process to be carried out before phosphate films are applied to steel sheets or plated steel sheets such as galvanized steel sheets and comprises treating the surfaces of such steel sheets or plated steel sheets with a suspension of an insoluble phosphate of bivalent or trivalent metal. If such pretreatment is applied, in the subsequent phosphate treatment, a phosphate film will be produced within a very short time and will be very fine and compact.
Generally, in depositing a phosphate film on the surface of a steel sheet or plated steel sheet, the pretreatment of the surface is so important that, if no pretreatment is applied at all, no film will be produced at all or only a phosphate film of coarse crystals will be obtained in the subsequent phosphate treatment. It seems to be substantially ineffective to pretreatment to use a solution prepared by dissolving such soluble phosphate as, for example, Zn(H PO Currently, the prior art has adopted a pretreating liquid comprising a solution of soluble sodium phosphate containing titanium. However, as a result of investigations we have made, it has been disclosed that the ingredient contributing to the formation of a phosphate film of fine crystals is the titanium in the solution. Further, with the decrease of titanium, we have found that the pretreating solution will be aged, that is, the coating weight of phosphate will increase and the crystal grains of the phosphate film will become coarse. As a result of the aging process the soluble phosphate in such pretreating liquid is not effective.
In order to obtain a suitable phosphate film by the above described prior art methods, the pretreating liquid must be frequently replaced so that a fixed amount of titanium may be always present. Thus this conventional pretreating liquid has decided disadvantages in that it is troublesome and costly.
Further, with such pretreating liquid, as described above, in order to form very fine phosphate film crystals on a steel sheet or a plated steel sheet, the concentration States Patent 0 3,395,5Z Patented July 30, 1968 of the liquid must be high and therefore the unit price of the product is much higher than that of the present invention. Even if the concentration of the liquid is kept high and the steel sheet is treated in said pretreating liquid and then further in a phosphate-treating liquid, the crystal size of the phosphate film will be almost invariably above 3 and rarely below 1 1..
The prior art also utilizes a mechanical pretreating process wherein no pretreating liquid is used therein. According to this process, the surface of a steel sheet is rubbed with a proper rubbing tool before it is dipped in a phosphate-treating liquid. However, in such mechanical process, in order to carefully uniformly rub the surface of the steel sheet, a device of a considerably high precision is required. Therefore, it can not be recommended.
The present invention is designed to eliminate the defects of the prior art processes as described above. As a result of our research for a very economical and efficient pretreating process, we have now invented a new pretreating process for phosphate treatment.
According to the present invention, a suspension of an insoluble phosphate of a bivalent or trivalent metal is used so that the surface of a steel sheet may be mechanically rubbed and ground, and fine crystal nuclei of the phosphate may be then imparted to the surface thereof. Thus by the present invention, fine crystals of the phosphate may be produced uniformly on the surface of the steel sheet within a very short time.
An object of the present invention is to provide a pretreating process for the phosphate treatment of metal surfaces wherein a favorable fine compact phosphate film can be formed within a very short time on the surface of a steel sheet or a plated steel sheet such as a galvanized steel sheet.
Another object of the present invention is to provide a pretreating liquid which is economical and easy to apply by spraying or dipping in a pretreating process for phosphate-treating steel sheets or plated steel sheets.
Other objects and a fuller understanding of the invention may be had by referring to the following description and claims.
The present invention shall be described in detail in the following.
In the pretreating process according to the present invention, there is used an insoluble phosphate of a bivalent or trivalent metal suspended in water. For example, the insoluble phosphate of the bivalent metal is zinc phosphate, calcium phosphate, magnesium phosphate or ferrous phosphate and that of the trivalent metal is ferric phosphate or aluminum phosphate. In the case of a low concentration (up to about 3 g./liter), if the suspension is sprayed onto the surface of a steel sheet or a plated steel sheet under a high pressure, a favorable uniforrr pretreated surface will be obtained. In order to obtain a favorable result with a liquid of a high concentration, usually the steel sheet or plated steel sheet is dipped in the liquid or, after the dipping, the deposited liquid is pressed or rubbed onto the surface of the sheet with a roll or the like.
In the above mentioned spraying method under a high pressure, the favorable concentration of the suspension is more than 1 g./liter. However, if there is no restriction to the spraying manner, the higher the concentration, the better the result. Specifically a concentration of more than 5 g./liter is preferable. A proper concentration may be selected in response to the performances of the nozzle.
A spraying pressure of more than 0.5 kg./cm. is preferable. The higher the spraying pressure, the better the result. Also, the longer the spraying time, the better the result. But a spraying time of less than 1 minute is sulficient.
The spraying pressure, the spraying time and the concentration of the suspension are so closely correlated with one another that, when the spraying pressure is restricted, and the spraying time is made longer, a favorable result will be obtained and, when the spraying time is restricted, and the concentration of the suspension is elevated, a favorable result will also be obtained.
The above mentioned high. pressure spraying method is effective to a suspension of a low concentration. But, when the concentration of the suspension is high, said method will be ditticult to apply in view of the equipment. In the case of a suspension of such high concentration, only dipping the steel sheet in the suspension will be effective. Further repeating the dripping or squeezing with a roll after the dipping is elfective.
The preferable pH of the suspension is slightly acid or alkaline at about 3 to 10. Outside this range, the steel sheet will corrode or will dissolve in the phosphate with an unfavorable result. It is proper to adjust the pH with phosphoric acid or sodium phosphate.
The bivalent or trivalent metal which is the principal agent in the present pretreating process may be used as crushed from crystals or as prepared from a soluble salt of the bivalent or trivalent metal or by adding a phosphate to the carbonate or oxide of such metal.
In the present invention, the higher the treating ternperature, the better the result. But the effect of the temperature is rather small. Thus the treatment may be applied at to 90 C.
When no pretreatment is applied at all, the crystal size of the obtained phosphate film will be so coarse as to be more than 100w but, when the present pretreatment is applied, the crystal size will be so fine as to be 2a or less. The time required to complete the phosphate treatment will be generally less than 2 minutes when the conventional pretreating process is carried out but will be so short as to be specifically less than 10 seconds when the present pretreating process is carried out.
Examples of the present invention are as follows:
Example 1 A fabricated steel sheet was dipped in an alkali solution so as to be degreased, was washed with water and was sprayed under the following conditions:
Ferric phosphate g./liters Liquid temperature C.-- pH 9.8 Spraying pressure kg./cm. 3.0 Spraying time minutes 1 After the spraying treatment, the fabricated steel sheet was washed with running water and was then treated with phosphate-treatin g bath.
The time required to complete the phosphate treatment was only 10 seconds when the pretreatment of the present invention had been applied but was more than 5 minutes, sometimes no film being produced, when no pretreatment had been applied at all. The crystal size of the produced phosphate film was so fine as to be 2 when the present pretreatment had been applied.
Example 2 An electrogalvanized steel sheet was sprayed under the following conditions:
Zinc phosphate 'g./liters 25 Liquid temperature C. 30 pH 7.8 Spraying pressure Kg./cm. 2.5 Spraying time seconds 5 After the spraying treatment, the sheet was squeezed with a roll and was soon treated with phosphate-treating bath.
When the present pretreatment had been applied, the time required to complete the phosphate treatment was about 10 seconds and the crystal size of the produced phosphate film was so fine as to be l t.
Example 3 A hot-dipped galvanized steel sheet was dipped under the following conditions:
After the dipping treatment, the sheet was squeezed with a rubber roll, was washed with water and was treated with phosphate-treating bath.
When the present pretreatment had been applied, the time required to complete the phosphate treatment was about 15 seconds and the crystal size of the produced phos phate film was so fine as to be 2,4.
While the present invention has been specifically described herein With reference to the preferred embodiments of the invention, it is to be understood that the present invention may be otherwise practiced than as specifically described within the scope and spirit of the appended claims.
What we claim is:
1. In a method of phosphatizing the surface of steel sheets or plated steel sheets, wherein said method is preceded by a pretreating process, the improvement according to which the pretreating process comprises applying to the surface of said steel sheets, a liquid aqueous suspension of an insoluble phosphate selected from the group consisting of zinc phosphate, calcium phosphate, magnesium phosphate, ferrous phosphate, ferric phosphate, and aluminum phosphate, in which said liquid suspension contains more than 1 g./l. of said phosphate and wherein the pH of the liquid is adjusted to from 3 to 10.
2. A process according to claim 1 wherein the suspension is sprayed onto the surface of the steel sheet under a spraying pressure of more than 0.5 l g./cm.
3. A process according to claim 2 wherein the temperature of the liquid suspension is 10 to C.
4. A process according to claim 1 in which the steel sheet is dipped in the suspension of the insoluble phosphate during the pretreating process.
5. A process according to claim 4 in which the temperature of the liquid suspension is from 10 to 90 C.
6. A process according to claim 5 in which the steel sheets, after the pretreatment process are then squeezed with a roll.
7. A process according to claim 1 in which said insoluble phosphate is zinc phosphate.
8. A process according to claim 1 in which the insoluble phosphate is calcium phosphate.
9. A process according to claim 1 in which the insoluble phosphate is magnesium phosphate.
10. A process according to claim 1 in which the insoluble phosphate is ferrous phosphate.
11. A process according to claim 1 in which the insoluble phosphate is ferric phosphate.
12. A process according to claim 1 in which the insoluble phosphate is aluminum phosphate.
13. In a method of phosphatizing the surface of steel sheets or plated steel sheets, wherein said method is preceded by a pret-reating process, the improvement according to which the pretreating process comprises dipping said steel sheets in a liquid aqueous suspension, containing at least 1 g./l. of zinc phosphate at a liquid temperature of 10 to 90 C. and at a pH of 3 to 10, then squeezing the sheets with a roll.
14. In a method of phosphatizing the surface of steel sheets or plated steel sheets, wherein said method is preceded by a pretreating process, the improvement accord ing to which the pretreating process comprises spraying 5 6 a liquid aqueous suspension, containing at least 1 g./l. of 2,357,269 8/ 1944 Russell et al 1486.15 X zinc phosphate, at a liquid temperature of 10 to 90 C., 2,479,423 8/1949 Snyder 148-6.15 onto the surface of said steel sheets, said spraying pres- 2,501,846 3/1950 Gilford 1486.15 sure being at least 0.5 kg./cm. and the pH of said liquid 2,514,149 7/ 1950 Amundsen 148-6.15 bemg mm 3 5 FOREIGN PATENTS References Cited 21,870 10/ 1963 Japan,
UNITED STATES PATENTS ALFRED L. LEAVITT, Primary Examiner. 2,329,065 9/1943 Lum et a1. 148-615 2,342,738 2/1944 Iernstedt 148 -6.16 10 BROWDY Exammer'
US395285A 1963-09-30 1964-09-09 Pretreating process for phosphatetreating steel sheets and plated steel sheets Expired - Lifetime US3395052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5294063 1963-09-30

Publications (1)

Publication Number Publication Date
US3395052A true US3395052A (en) 1968-07-30

Family

ID=12928849

Family Applications (1)

Application Number Title Priority Date Filing Date
US395285A Expired - Lifetime US3395052A (en) 1963-09-30 1964-09-09 Pretreating process for phosphatetreating steel sheets and plated steel sheets

Country Status (3)

Country Link
US (1) US3395052A (en)
DE (1) DE1546070B2 (en)
GB (1) GB1084017A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617393A (en) * 1969-10-08 1971-11-02 Dainippon Toryo Kk Pretreatment before electrophoretic painting
WO2001012341A1 (en) * 1999-08-16 2001-02-22 Henkel Corporation Process for forming a phosphate conversion coating on metal
US6361623B1 (en) * 1997-06-13 2002-03-26 Henkel Corporation Method for phosphatizing iron and steel
EP1378586A1 (en) * 2002-06-13 2004-01-07 Nippon Paint Co., Ltd. Zinc phosphate-containing conditioning agent for phosphate conversion-treatment of steel plate and corresponding product
US6723178B1 (en) 1999-08-16 2004-04-20 Henkel Corporation Process for forming a phosphate conversion coating on metal
US20070012382A1 (en) * 2005-07-15 2007-01-18 Nhk Spring Co., Ltd. Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315086A1 (en) * 1983-04-26 1984-10-31 Metallgesellschaft Ag, 6000 Frankfurt METHOD FOR PHOSPHATING COMPOSITE METALS
US5868873A (en) * 1993-09-17 1999-02-09 Brent International Plc Pre-rinse for phosphating metal surfaces
JP3451334B2 (en) * 1997-03-07 2003-09-29 日本パーカライジング株式会社 Pretreatment liquid for surface conditioning before phosphate conversion treatment of metal and surface conditioning method
US6214132B1 (en) 1997-03-07 2001-04-10 Henkel Corporation Conditioning metal surfaces prior to phosphate conversion coating

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2329065A (en) * 1942-03-06 1943-09-07 Westinghouse Electric & Mfg Co Corrosion resistant coating for metal surfaces
US2342738A (en) * 1941-09-17 1944-02-29 Westinghouse Electric & Mfg Co Corrosion resistant coating for metal surfaces
US2357269A (en) * 1942-04-22 1944-08-29 David A Russell Art of treating ferrous metal articles
US2479423A (en) * 1946-02-07 1949-08-16 American Chem Paint Co Method of and materials for treating surfaces of iron, zinc, and alloys of each
US2501846A (en) * 1945-10-03 1950-03-28 Armco Steel Corp Production of silicon steel sheet stock having the property of high surface resistivity
US2514149A (en) * 1948-09-04 1950-07-04 Parker Rust Proof Co Coating of metal surfaces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342738A (en) * 1941-09-17 1944-02-29 Westinghouse Electric & Mfg Co Corrosion resistant coating for metal surfaces
US2329065A (en) * 1942-03-06 1943-09-07 Westinghouse Electric & Mfg Co Corrosion resistant coating for metal surfaces
US2357269A (en) * 1942-04-22 1944-08-29 David A Russell Art of treating ferrous metal articles
US2501846A (en) * 1945-10-03 1950-03-28 Armco Steel Corp Production of silicon steel sheet stock having the property of high surface resistivity
US2479423A (en) * 1946-02-07 1949-08-16 American Chem Paint Co Method of and materials for treating surfaces of iron, zinc, and alloys of each
US2514149A (en) * 1948-09-04 1950-07-04 Parker Rust Proof Co Coating of metal surfaces

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617393A (en) * 1969-10-08 1971-11-02 Dainippon Toryo Kk Pretreatment before electrophoretic painting
US6361623B1 (en) * 1997-06-13 2002-03-26 Henkel Corporation Method for phosphatizing iron and steel
WO2001012341A1 (en) * 1999-08-16 2001-02-22 Henkel Corporation Process for forming a phosphate conversion coating on metal
US6723178B1 (en) 1999-08-16 2004-04-20 Henkel Corporation Process for forming a phosphate conversion coating on metal
EP1378586A1 (en) * 2002-06-13 2004-01-07 Nippon Paint Co., Ltd. Zinc phosphate-containing conditioning agent for phosphate conversion-treatment of steel plate and corresponding product
US20040011429A1 (en) * 2002-06-13 2004-01-22 Nippon Paint Co., Ltd. Zinc phosphate-containing surface conditioning agent phosphate conversion-treated steel plate and painted steel plate, and zinc phosphate dispersion
US20070012382A1 (en) * 2005-07-15 2007-01-18 Nhk Spring Co., Ltd. Steel product excellent in corrosion resistance and corrosion fatigue resistance, and surface treatment method therefor

Also Published As

Publication number Publication date
DE1546070A1 (en) 1969-06-26
DE1546070B2 (en) 1970-07-23
GB1084017A (en) 1967-09-20

Similar Documents

Publication Publication Date Title
CA1274156A (en) Chromate coating of zinc surfaces
US3395052A (en) Pretreating process for phosphatetreating steel sheets and plated steel sheets
US2121574A (en) Art of coating zinc
US2825697A (en) Method of and solution for the surface treatment of aluminum
GB2179680A (en) Method of forming phosphate coatings on zinc
US2462196A (en) Protective phosphate coatings for metal surfaces
US2702768A (en) Ferrous surface coating process using alkali metal phosphates and hydroxylamines
US3838023A (en) Sealing anodized aluminum
US2563431A (en) Method of improving the resistance
JPH02190478A (en) Formation of phosphate film
US3104993A (en) Galvanizing process
US2548420A (en) Method of producing lustrous zinc
US2132883A (en) Method of coating ferrous metal with a water insoluble metallic phosphate
US3895969A (en) Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing surface for synthetic resin coating compositions
US2316811A (en) Method of coating ferrous metal surfaces with water insoluble metallic phosphates
US2316810A (en) Method of and material for coating metal surfaces with water insoluble metallic phosphates
US3767476A (en) Method and composition for phosphatizing steel under pressure
DE862848C (en) Process and pretreatment of alkali-cleaned metal surfaces before applying phosphate coatings
US3632447A (en) Metal-treating process
US1961030A (en) Process for protecting magnesium and its alloys against corrosion
US2245609A (en) Metal finishing process
US2851386A (en) Method for coating zinc and zinc alloy sheets
US3052575A (en) Method of inhibiting corrosion
US2738289A (en) Hot dip aluminum coating process
US2628925A (en) Bright corrosion resistant coating of metals