GB807730A - Process for maintaining the efficiency of phosphatising baths at room temperature - Google Patents

Process for maintaining the efficiency of phosphatising baths at room temperature

Info

Publication number
GB807730A
GB807730A GB11800/56A GB1180056A GB807730A GB 807730 A GB807730 A GB 807730A GB 11800/56 A GB11800/56 A GB 11800/56A GB 1180056 A GB1180056 A GB 1180056A GB 807730 A GB807730 A GB 807730A
Authority
GB
United Kingdom
Prior art keywords
room temperature
baths
efficiency
phosphatising
maintaining
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
Application number
GB11800/56A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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 Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA filed Critical Montedison SpA
Publication of GB807730A publication Critical patent/GB807730A/en
Expired 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
    • C23C22/05—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
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
    • 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
    • C23C22/86—Regeneration of coating baths

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)
  • Catalysts (AREA)

Abstract

In phosphating metals primarily iron, at room temperature, the efficiency of the phosphating bath is maintained by adding either continuously or in batches, mixtures of zinc phosphate, zinc nitrate and/or an alkali metal nitrate, the P2O5:NO3 ratio being between 1:1 and 1:05, and containing oxidizing agent(s) in an amount not more than 1/10 of the NO3 added with the regenerating solutions, and optionally accelerators. Preferably the oxidant is NaNO2, its minimum being 1/200 of the NO3; while for baths in which P2O5:NO3 lies between 1:1 and 1:3 the regenerating ratio P2O5:NO3 preferably is between 1:0.8 and 1:0.7. In an example, a bath used at room temperature and containing per litre 20 gm. Zn, 20 gm. P2O5 and 40 gm. NO3 (P2O5:NO3=1:2) is regenerated with a solution having per litre 170 gm. zn, 240 gm. P2O5, 170 gm. NO3, 0.1 gm. Cu, (P2O5:NO3=1:0.73), and NaNO2 between 1/200 and 1/10 of the NO3.
GB11800/56A 1955-04-20 1956-04-18 Process for maintaining the efficiency of phosphatising baths at room temperature Expired GB807730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT807730X 1955-04-20

Publications (1)

Publication Number Publication Date
GB807730A true GB807730A (en) 1959-01-21

Family

ID=11317044

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11800/56A Expired GB807730A (en) 1955-04-20 1956-04-18 Process for maintaining the efficiency of phosphatising baths at room temperature

Country Status (1)

Country Link
GB (1) GB807730A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338755A (en) * 1963-09-03 1967-08-29 Hooker Chemical Corp Production of phosphate coatings on metals
US4443273A (en) * 1980-12-26 1984-04-17 Koichi Saito Method for replenishing chemical in zinc phosphate treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3338755A (en) * 1963-09-03 1967-08-29 Hooker Chemical Corp Production of phosphate coatings on metals
US4443273A (en) * 1980-12-26 1984-04-17 Koichi Saito Method for replenishing chemical in zinc phosphate treatment

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