US2465247A - Composition for and method of producing phosphate films on metals - Google Patents

Composition for and method of producing phosphate films on metals Download PDF

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Publication number
US2465247A
US2465247A US705373A US70537346A US2465247A US 2465247 A US2465247 A US 2465247A US 705373 A US705373 A US 705373A US 70537346 A US70537346 A US 70537346A US 2465247 A US2465247 A US 2465247A
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United States
Prior art keywords
phosphate
composition
silica aerogel
paste
metal
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Expired - Lifetime
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US705373A
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English (en)
Inventor
Byron V Mcbride
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CBS Corp
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Westinghouse Electric Corp
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Publication date
Priority to FR954618D priority Critical patent/FR954618A/fr
Priority to BE476601D priority patent/BE476601A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US705373A priority patent/US2465247A/en
Priority to CH268172D priority patent/CH268172A/de
Application granted granted Critical
Publication of US2465247A publication Critical patent/US2465247A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the protective phosphate compositions be applied to only predetermined portions of the metal surfaces without running, dripping or other contamination of the rest of the surfaces of the particular member being treated. No phosphate composition known has been found suitable or adequate for controlled treatment of metal surfaces.
  • the object of the present invention is to provide a paste-like adherent coating composition which may be applied to predetermined portions of surfaces of members to produce thereon protective phosphate films without undesirable action on other portions of the surfaces.
  • a further object of this invention is to produce a paste-like adherent coating composition which, when applied to metal surfaces, will produce thereon protective phosphate films and a readily removable powderedlayer on drying.
  • Fig. 2 is likewise a vertical cross section showing a further step in the process of treatment
  • paste-like compositions that are relatively permanently stable have been produced for application to ferrous, zinc and cadmium metal surfaces whereby to produce protective phosphate coatings therein at any predetermined portion of the surface. After-treatment of the metal surfaces is easy and highly protective phosphate films on the metal surface are obtained.
  • the paste-like coating compositions are produced by combining a finely divided porous silica aerogel with an aqueous solution capable of producing phosphate films when applied to the metal surfaces. Outstanding results have been obtained when from 10 to 45 parts by weight of a porous silica aerogel, finely divided to the extent that at least about 50% passes through a 180 mesh screen, is combined with 100 parts by weight of an aqueous phosphate solution.
  • the aqueous phosphate solution should contain essentially from 25% to by weight of a phosphorous compound capable of supplying phosphate ions to react with the metal and an oxidizing agent, the balance of the solution being water.
  • the composition is relatively paste-like so that when applied by means of brushing or even by spraying, the composition remains at the point of application to the metal as an adherent coating that does not flow or drip. Furthermore, the paste-like nature of the composition is relatively permanent and it may be stored for prolonged periods of time without undue separation and it may be employed without continual stirring. Other advantages of the composition will be set forth hereinafter.
  • Example I 1 pounds of the porous silica aerogel sold to thetrade as No. 58 micropulverized Santocel is admixed with one gallon of a composition composed of the following ingredients.
  • the wetting agent was a sodium alkyl aryl sulfonate sold to the trade under the name Nacoonal.
  • the composition was a smooth, thick paste that could be applied to steel panels as a thin uniform coating that adhered to the surfaces to which it was applied.
  • the composition formed protective phosphate films in a few minutes and on air drying a fluffy, nonadherent layer of silica aerogel resulted.
  • Paste-like compositions were prepared with as little as 10 parts by weight of the silica aerogel to parts by weight of the aqueous phosphate solution.
  • the paste was readily applied by spraying.
  • Thicker pastes that could be readily applied by brushing or spraying were prepared with as much as 45 parts by weight of the silica aerogel to the liquid phosphate solution.
  • Suitable cellulose ethers are water soluble methyl cellulose and ethyl cellulose formulations.
  • the phosphate solutions may contain free phosphoric acid and acidic phosphate compounds.
  • the pH of the phosphate solutions will vary from 0.5 to 6.
  • the oxidizing agent may be a nitrate, a nitrite or other compound capable of oxidizing hydrogen which results from the reaction of the metal and the phosphate solution.
  • a metal sheet l2 whose upper surface I4 is to be treated to provide a protective phosphate coating thereon.
  • the paste-like silica aerogel composition of the present invention is applied as a coating I6 to the upper surface of the member I 2.
  • a coating of a thickness of inch to 1 3' of an inch in thickness is adequate.
  • a protective phosphate film will be produced on the surface I4 in a matter of a few minutes.
  • the treated metal surface can be put in an oven in order that the coating react more promptly and the silica aerogel form a dried layer. Even surfaces that are slightly oily can be coated with the composition and a satisfactory ,phosphate film produced.
  • a single application of the composition has been found to produce heavier and more uniform phosphate films thanthe aqueous phosphate solution without the silica aerogel would be capable of producing.
  • Vertical and overhead surfaces can be easily treated without running or dripping occurring.
  • the phosphate films produced on 5. such vertical or overhead surfaces are equal in quality to that produced on upper horizontal surfaces.
  • a paste-like chromium composition may be prepared by admixing 100 parts by weight of the silica aerogel with from to 200 parts by weight of the hexavalent chromium compound and sufiicient water to produce a fiowable paste.
  • the chromium composition so produced may be applied to the phosphate film in the manner shown in Fig. 2 of the drawing.
  • the metal surface M of the member l2 carrying the protective phosphate film I8 is covered with a coating 20 of the paste-like chromium containing composition.
  • the coating 28 may be dried in about minutes and a simple brushing or dipping in water will remove the dried silica aerogel which forms and is in a loose powdery state.
  • the inhibitive effect of the chromium derived from layer has been found to be far superior to that secured with the conventional dilute chromic acid rinse common in the art today.
  • a suitable hexavalent chromium composition is as follows:
  • Example III Porous silica aerogel oz 13 Sodium dichromate oz 13 Water gal- 1 The composition forms a smooth paste that may be brushed on and it will not drip or spread undesirably.
  • the protective phosphate films produced by means of the paste-like coating composition of the present invention are so superior to those produced by other compositions that it is desirable to employ the compositions even when treating all the surfaces of a metal member.
  • the use of the paste-like com-position is also advantageous in cases where only a small amount of metal is being treated since expensive installations, such as dip tanks, conveyors and the like, are unnecessary.
  • a stable paste-like coating composition suitable for use in producing protective phosphate coatings on ferrous, zinc and cadmium metal surfaces composed of from 10 to 45 parts by weight of a porous silica aerogel finely divided to the extent that at least-about 50% passes through a mesh screen, and 100 parts by weight of an aqueous "phosphate solution having a pH of from 0.5 to 6, the phosphate solution composed essentially of from 25% to 70% by weight of a phosphorus compound capable of supplying phosphate ions to react with the metal and an oxidizing agent, and the balance of the phosphate solution being water, the porous silica aerogel rendering the paste-like nature of the composition relatively permanent, the composition being sufficiently fiowable to be applied as a thin smooth coating to the metal surfaces which upon drying forms a relatively nonadherent silica aerogel and a smooth underlying protective phosphate film on the metal.
  • a stable paste-lik coating composition suitable for use in producing protective phosphate coatings on ferrous, zinc and cadmium metal surf-aces composed of from 10 to 45 parts by weight of a porous silica aerogel finely divided to the extent that at least about 50% passes through a 100 mesh screen, from 0.1 to 3 parts by weight of a wetting agent, from to 5 parts by weight of a water soluble cellulose ether, and 100 parts by weight of an aqueous phosphate solution having a pH of from 0.5 to 6, the phosphate solution composed essentially of from 25% to 70% by weight of a phosphorus compound capable of supplying phosphate ions to react with the metal and an oxidizing agent, and the balance of the phosphate solution being water, the porous silica aerogel rendering the paste-like nature of the composition relatively permanent, the composition being sufficiently flowable to be applied as a thin, smooth coating to the metal surfaces which upon drying forms a relatively nonadherent silica aerogel layer and a smooth underlying protective phosphate film on
  • a paste-like layer of a coating composition composed essentially of from 10 to 45 parts by weight of a porous silica aerogel finely divided to the extent that at least about 50% passes through a 100 mesh screen, and 100 parts by weight of an aqueous phosphate solution having a pH of from 0.5 to 6, the phosphate solution composed essentially of from 25% to 70% by weight of a .phosphorus compound capable of supplying phosphate ions to react with the metal, and an oxidizing agent, and the balance of the phosphate solution being water, drying the coating, removing the relatively nonadherent layer of silica aerogel produced on drying, and exposing a smooth protective phosphate film on the metal surfaces.
  • a paste-like layer of a coating composition composed essentially of from 10 to 5 parts by weight of a porous silica aerogel finely divided 'to the extent that at least about 50% passes through a 100 mesh screen, and 100 parts by weight of an aqueous phosphate solution having a pH of from 0.5 to 6, the phosphate solution composed essentially of from 25% to 70% by weight of a phosphorus compound capable of supplying phosphate ions to react with the metal, and an oxidizing agent,

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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)
US705373A 1946-10-24 1946-10-24 Composition for and method of producing phosphate films on metals Expired - Lifetime US2465247A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR954618D FR954618A (de) 1946-10-24
BE476601D BE476601A (de) 1946-10-24
US705373A US2465247A (en) 1946-10-24 1946-10-24 Composition for and method of producing phosphate films on metals
CH268172D CH268172A (de) 1946-10-24 1947-10-23 Verfahren zur Herstellung von Phosphatschutzüberzügen.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US705373A US2465247A (en) 1946-10-24 1946-10-24 Composition for and method of producing phosphate films on metals

Publications (1)

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US2465247A true US2465247A (en) 1949-03-22

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US (1) US2465247A (de)
BE (1) BE476601A (de)
CH (1) CH268172A (de)
FR (1) FR954618A (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610133A (en) * 1949-10-26 1952-09-09 Rca Corp Processes of brightening and passivating cadmium and zinc
US2743203A (en) * 1951-08-29 1956-04-24 Westinghouse Electric Corp Phosphate coating for electrical steel
US2787565A (en) * 1950-05-08 1957-04-02 Gen Per La Fosfatazione S P A Treatment of metal surfaces
US2811456A (en) * 1955-02-28 1957-10-29 Victor Chemical Works Protective film for ferrous metals
US2826517A (en) * 1954-01-11 1958-03-11 Kelite Products Inc Process and composition for phosphatizing steel
US2835618A (en) * 1954-03-09 1958-05-20 Parker Rust Proof Co Solution and method for producing heat resistant electrical insulation coatings on ferrous surfaces
US2852396A (en) * 1955-02-11 1958-09-16 Standard Oil Co Slushing oils containing copper powder
US3189488A (en) * 1960-10-10 1965-06-15 Amchem Prod Solutions and method for coating metal surfaces
US3248251A (en) * 1963-06-28 1966-04-26 Teleflex Inc Inorganic coating and bonding composition
US3248250A (en) * 1963-06-28 1966-04-26 Teleflex Inc Coating and bonding composition
US3395027A (en) * 1964-03-05 1968-07-30 Teleflex Inc Coating composition and method
US4316751A (en) * 1980-04-14 1982-02-23 Hooker Chemicals & Plastics Corp. Electrical resistance coating for steel
US4548646A (en) * 1982-11-15 1985-10-22 Sermatech International Incorporated Thixotropic coating compositions and methods
US4981757A (en) * 1986-01-13 1991-01-01 Ashland Oil, Inc. Coating compositions and method for forming a self-healing corrosion preventative film
US5024697A (en) * 1986-01-13 1991-06-18 Ashland Oil, Inc. Coating composition and method for forming a self-heating corrosion preventative film
US5153032A (en) * 1986-01-13 1992-10-06 Ashland Oil, Inc. Coating compositions and method for forming a self-healing corrosion preventative film
US5176947A (en) * 1990-12-07 1993-01-05 International Business Machines Corporation Electroerosion printing plates
WO2013139961A1 (en) * 2012-03-23 2013-09-26 Institutt For Bygg, Anlegg Og Transport A composition for production of construction materials
EP3072860A1 (de) * 2015-03-27 2016-09-28 Fritz Egger GmbH & Co. OG Phosphatbasierte keramische beschichtungen mit porösen teilchen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102522B (de) * 1952-05-03 1961-03-16 Felix Ritter Von Rueling Heissspritzverfahren zur chemischen Behandlung von Oberflaechen
DE958749C (de) * 1952-05-11 1957-02-21 Siemens Ag Verfahren zur Erzeugung einer chemischen Schutzschicht auf metallischen Kabelmaenteln

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750270A (en) * 1927-06-13 1930-03-11 Parker Rust Proof Co Coated iron and steel articles and method of making the same
US1980518A (en) * 1932-05-17 1934-11-13 American Chem Paint Co Material for coating metal
US2005780A (en) * 1932-05-23 1935-06-25 American Chem Paint Co Material for providing metal with a paint receptive surface
US2030601A (en) * 1934-04-20 1936-02-11 Victor Chemical Works Rustproofing composition and method of coating iron and steel
US2080950A (en) * 1935-11-16 1937-05-18 Johnson Service Co Temperature control device
US2093454A (en) * 1934-10-01 1937-09-21 Samuel S Kistler Method of producing aerogels
US2302510A (en) * 1931-09-23 1942-11-17 Parker Rust Proof Co Material and method for cleaning and coating metal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1750270A (en) * 1927-06-13 1930-03-11 Parker Rust Proof Co Coated iron and steel articles and method of making the same
US2302510A (en) * 1931-09-23 1942-11-17 Parker Rust Proof Co Material and method for cleaning and coating metal
US1980518A (en) * 1932-05-17 1934-11-13 American Chem Paint Co Material for coating metal
US2005780A (en) * 1932-05-23 1935-06-25 American Chem Paint Co Material for providing metal with a paint receptive surface
US2030601A (en) * 1934-04-20 1936-02-11 Victor Chemical Works Rustproofing composition and method of coating iron and steel
US2093454A (en) * 1934-10-01 1937-09-21 Samuel S Kistler Method of producing aerogels
US2080950A (en) * 1935-11-16 1937-05-18 Johnson Service Co Temperature control device

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610133A (en) * 1949-10-26 1952-09-09 Rca Corp Processes of brightening and passivating cadmium and zinc
US2787565A (en) * 1950-05-08 1957-04-02 Gen Per La Fosfatazione S P A Treatment of metal surfaces
US2743203A (en) * 1951-08-29 1956-04-24 Westinghouse Electric Corp Phosphate coating for electrical steel
US2826517A (en) * 1954-01-11 1958-03-11 Kelite Products Inc Process and composition for phosphatizing steel
US2835618A (en) * 1954-03-09 1958-05-20 Parker Rust Proof Co Solution and method for producing heat resistant electrical insulation coatings on ferrous surfaces
US2852396A (en) * 1955-02-11 1958-09-16 Standard Oil Co Slushing oils containing copper powder
US2811456A (en) * 1955-02-28 1957-10-29 Victor Chemical Works Protective film for ferrous metals
US3189488A (en) * 1960-10-10 1965-06-15 Amchem Prod Solutions and method for coating metal surfaces
US3248251A (en) * 1963-06-28 1966-04-26 Teleflex Inc Inorganic coating and bonding composition
US3248250A (en) * 1963-06-28 1966-04-26 Teleflex Inc Coating and bonding composition
US3395027A (en) * 1964-03-05 1968-07-30 Teleflex Inc Coating composition and method
US4316751A (en) * 1980-04-14 1982-02-23 Hooker Chemicals & Plastics Corp. Electrical resistance coating for steel
US4548646A (en) * 1982-11-15 1985-10-22 Sermatech International Incorporated Thixotropic coating compositions and methods
US4981757A (en) * 1986-01-13 1991-01-01 Ashland Oil, Inc. Coating compositions and method for forming a self-healing corrosion preventative film
US5024697A (en) * 1986-01-13 1991-06-18 Ashland Oil, Inc. Coating composition and method for forming a self-heating corrosion preventative film
US5153032A (en) * 1986-01-13 1992-10-06 Ashland Oil, Inc. Coating compositions and method for forming a self-healing corrosion preventative film
US5176947A (en) * 1990-12-07 1993-01-05 International Business Machines Corporation Electroerosion printing plates
WO2013139961A1 (en) * 2012-03-23 2013-09-26 Institutt For Bygg, Anlegg Og Transport A composition for production of construction materials
EP3072860A1 (de) * 2015-03-27 2016-09-28 Fritz Egger GmbH & Co. OG Phosphatbasierte keramische beschichtungen mit porösen teilchen
EP3072861A1 (de) * 2015-03-27 2016-09-28 Fritz Egger GmbH & Co. OG Phosphatbasierte keramikbeschichtungen mit aerogelpartikeln

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Publication number Publication date
BE476601A (de)
FR954618A (de) 1950-01-04
CH268172A (de) 1950-05-15

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