GB489800A - Improvements in processes for producing protective coatings on metals of the iron group and their alloys - Google Patents
Improvements in processes for producing protective coatings on metals of the iron group and their alloysInfo
- Publication number
- GB489800A GB489800A GB12608/37A GB1260837A GB489800A GB 489800 A GB489800 A GB 489800A GB 12608/37 A GB12608/37 A GB 12608/37A GB 1260837 A GB1260837 A GB 1260837A GB 489800 A GB489800 A GB 489800A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- monochromate
- alloys
- metals
- protective coatings
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract 2
- 229910045601 alloy Inorganic materials 0.000 title abstract 2
- 239000000956 alloy Substances 0.000 title abstract 2
- 229910052751 metal Inorganic materials 0.000 title abstract 2
- 239000002184 metal Substances 0.000 title abstract 2
- 150000002739 metals Chemical class 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 239000011253 protective coating Substances 0.000 title abstract 2
- 238000007792 addition Methods 0.000 abstract 2
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 abstract 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 abstract 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 abstract 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 1
- 238000007654 immersion Methods 0.000 abstract 1
- -1 potassium nitrate Chemical class 0.000 abstract 1
- 235000010333 potassium nitrate Nutrition 0.000 abstract 1
- 239000004323 potassium nitrate Substances 0.000 abstract 1
- 159000000001 potassium salts Chemical class 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- 159000000000 sodium salts Chemical class 0.000 abstract 1
- 230000001131 transforming effect Effects 0.000 abstract 1
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
- C23C22/70—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 melts
- C23C22/72—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
In a process for producing protective coatings on metals of the iron group and their alloys, by immersion in a fused saline bath at temperatures of 475-710 DEG C., the bath consists of potassium dichromate having a proportion of monochromate which is at least as great as that prescribed by the equilibrium ratio set up between the dichromate and monochromate at the temperature at which the bath is to be used, while at the same time not being so great that the bath ceases to be in a completely fused condition. The desired proportion of monochromate may be added to the bath or may be produced by the addition by corresponding additions of salts, such as potassium nitrate, which are capable of transforming the dichromate into the monochromate. The potassium salts may be replaced wholly or partially by the sodium salts. Specification 477,836 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE203195X | 1936-06-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB489800A true GB489800A (en) | 1938-08-04 |
Family
ID=5775178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12608/37A Expired GB489800A (en) | 1936-06-03 | 1937-05-03 | Improvements in processes for producing protective coatings on metals of the iron group and their alloys |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE420964A (en) |
| CH (1) | CH203195A (en) |
| FR (1) | FR820318A (en) |
| GB (1) | GB489800A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2120682A (en) * | 1982-04-23 | 1983-12-07 | Stephanois Rech Mec | Improving the corrosion resistance of ferrous metal parts by molten salt bath treatment to remove sulphur; filtering molten salts |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE838376C (en) * | 1942-07-11 | 1952-05-08 | Wieland Werke Ag | Bath for artificial aging of metallic materials |
-
0
- BE BE420964D patent/BE420964A/xx unknown
-
1937
- 1937-03-11 CH CH203195D patent/CH203195A/en unknown
- 1937-04-06 FR FR820318D patent/FR820318A/en not_active Expired
- 1937-05-03 GB GB12608/37A patent/GB489800A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2120682A (en) * | 1982-04-23 | 1983-12-07 | Stephanois Rech Mec | Improving the corrosion resistance of ferrous metal parts by molten salt bath treatment to remove sulphur; filtering molten salts |
Also Published As
| Publication number | Publication date |
|---|---|
| CH203195A (en) | 1939-02-28 |
| BE420964A (en) | |
| FR820318A (en) | 1937-11-09 |
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