GB502360A - Process for producing coatings on zinc and galvanised articles - Google Patents
Process for producing coatings on zinc and galvanised articlesInfo
- Publication number
- GB502360A GB502360A GB25104/37A GB2510437A GB502360A GB 502360 A GB502360 A GB 502360A GB 25104/37 A GB25104/37 A GB 25104/37A GB 2510437 A GB2510437 A GB 2510437A GB 502360 A GB502360 A GB 502360A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- molybdate
- bath
- acid
- heavy metal
- 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
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
- C23C22/40—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 molybdates, tungstates or vanadates
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)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
502,360. Coating metals. NETTER, L. Sept. 15, 1937, No. 25104. Convention date, Sept. 16, 1936. [Class 82 (ii)] Coloured coatings are produced on zinc and galvanized articles by treating the articles in a bath of heavy metal salt and then in a bath containing molybdic acid or a molybdate. The molybdate bath may contain small additions, e.g. 0.25 per cent, of heavy metal salts. The first bath contains salts of nickel, copper, cobalt, &c., e.g. it may consist of a solution of 10-15 per cent copper or nickel sulphate and 1 per cent acetic acid; the treatment may be effected with or without the use of electric current. When electric current is used the zinc &c. article is made the cathode. This treatment is stated to give a coating of heavy metal or heavy metal compound. The molybdate bath is preferably neutral or slightly acid and, to prevent sludge deposition, a buffer agent may be added. Suitable buffering agents are sodium acetate and acetic acid, sodium tartrate and tartaric acid, glycocoll and hydrochloric acid, sodium citrate and hydrochloric acid. Examples of suitable baths contain (a) 0À5-5 per cent of ammonium molybdate and 0À1-0À5 per cent of tartaric acid, (b) 0À5-5 per cent of ammonium molybdate alkalized with ammonia and set to a pH value of 5 by a buffer solution of sodium acetate and acetic acid. The molybdate solution is stated to form a molybdenum or molybdenum-containing coating on the article. Specification 419,469 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE502360X | 1936-09-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB502360A true GB502360A (en) | 1939-03-15 |
Family
ID=6545889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25104/37A Expired GB502360A (en) | 1936-09-16 | 1937-09-15 | Process for producing coatings on zinc and galvanised articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB502360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756772A (en) * | 1983-10-31 | 1988-07-12 | Alcan International Limited | Method of coloring a porous anodic oxide film on the surface of an aluminum article |
-
1937
- 1937-09-15 GB GB25104/37A patent/GB502360A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756772A (en) * | 1983-10-31 | 1988-07-12 | Alcan International Limited | Method of coloring a porous anodic oxide film on the surface of an aluminum article |
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