US3116177A - Process for degreasing and oxalating in a single spray stage - Google Patents

Process for degreasing and oxalating in a single spray stage Download PDF

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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
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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
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US62903A
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English (en)
Inventor
Cerma Paolo De
Viuronda Roberto
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Montedison SpA
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Montedison SpA
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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)
US62903A 1959-10-19 1960-10-17 Process for degreasing and oxalating in a single spray stage Expired - Lifetime US3116177A (en)

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)

Country Link
US (1) US3116177A (US20100268047A1-20101021-C00003.png)
BE (1) BE596132A (US20100268047A1-20101021-C00003.png)
CH (1) CH393029A (US20100268047A1-20101021-C00003.png)
DE (1) DE1796317A1 (US20100268047A1-20101021-C00003.png)
ES (1) ES262013A1 (US20100268047A1-20101021-C00003.png)
GB (1) GB898859A (US20100268047A1-20101021-C00003.png)
LU (1) LU39302A1 (US20100268047A1-20101021-C00003.png)
NL (1) NL256875A (US20100268047A1-20101021-C00003.png)

Cited By (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
BE596132A (fr) 1961-04-18
CH393029A (de) 1965-05-31
GB898859A (en) 1962-06-14
DE1796317A1 (de) 1973-05-03
LU39302A1 (US20100268047A1-20101021-C00003.png)
NL256875A (US20100268047A1-20101021-C00003.png)
ES262013A1 (es) 1961-05-16

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