GB473974A - Improvements in solutions for use in coating metals - Google Patents

Improvements in solutions for use in coating metals

Info

Publication number
GB473974A
GB473974A GB11525/36A GB1152536A GB473974A GB 473974 A GB473974 A GB 473974A GB 11525/36 A GB11525/36 A GB 11525/36A GB 1152536 A GB1152536 A GB 1152536A GB 473974 A GB473974 A GB 473974A
Authority
GB
United Kingdom
Prior art keywords
phosphates
solution
nitric acid
zinc
phosphate
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
GB11525/36A
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.)
Pyrene Co Ltd
Original Assignee
Pyrene 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 Pyrene Co Ltd filed Critical Pyrene Co Ltd
Publication of GB473974A publication Critical patent/GB473974A/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

Abstract

A coating bath or replenishing liquid for use in a phosphatizing process consists of a solution containing one or more metallic dihydrogen phosphates to which has been added nitric acid in quantity sufficient to avoid the presence of insoluble phosphates formed by hydrolysis. The nitric acid, which may be added before, during, or after the dissolution of the phosphates, reacts with the phosphates to form soluble nitrates, which act as accelerators, and free phosphoric acid which inhibits hydrolysis of the phosphates, and, as an alternative procedure, one or more p soluble metallic nitrates and free phosphoric acid in quantity sufficient to inhibit hydrolysis may be added direct to the solution instead of adding nitric acid. Dihydrogen phosphates of zinc, iron, manganese, calcium, cadmium, and barium may be used in the solution and may, if desired, be formed therein by chemical reaction. Solutions specified are formed by dissolving in water (a) zinc dihydrogen phosphate, nitric acid, and copper carbonate; (b) zinc dihydrogen phosphate, zinc nitrate, phosphoric acid, and copper carbonate. In making solution (a) the nitric acid is mixed with the water prior to or simultaneously with the addition of the phosphate and during the solution of the phosphate the solution is heated to 70-80 DEG C. which is approximately the temperature at which the coating bath is normally used.
GB11525/36A 1935-05-24 1936-04-22 Improvements in solutions for use in coating metals Expired GB473974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473974XA 1935-05-24 1935-05-24

Publications (1)

Publication Number Publication Date
GB473974A true GB473974A (en) 1937-10-22

Family

ID=21948721

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11525/36A Expired GB473974A (en) 1935-05-24 1936-04-22 Improvements in solutions for use in coating metals

Country Status (1)

Country Link
GB (1) GB473974A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747085C (en) * 1940-06-19 1944-09-06 Ig Farbenindustrie Ag Process for the production of phosphate layers on metals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747085C (en) * 1940-06-19 1944-09-06 Ig Farbenindustrie Ag Process for the production of phosphate layers on metals

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