GB616856A - A method for increasing the resistance of stainless steel devices to sulphuric acid - Google Patents
A method for increasing the resistance of stainless steel devices to sulphuric acidInfo
- Publication number
- GB616856A GB616856A GB27610/46A GB2761046A GB616856A GB 616856 A GB616856 A GB 616856A GB 27610/46 A GB27610/46 A GB 27610/46A GB 2761046 A GB2761046 A GB 2761046A GB 616856 A GB616856 A GB 616856A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- sulphuric acid
- stainless steel
- sept
- electro
- 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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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)
- Electrolytic Production Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
616,856. Preventing corrosion by sulphuric acid. SOC. D'ELECTRO-CHIMIE. D'ELECTRO-METALLURGIE ET DES ACIERIES ELECTRIQUES D'UGINE. Sept. 13, 1946, No. 27610. Convention date, Sept. 15, 1945. [Class 123(i)] Stainless steel sheet or apparatus is made resistant to corrosion by sulphuric acid by a method employing the steps (a) submitting the surfaces which may later come in contact with the sulphuric acid to a uniform attack by acid limited to a loss of metal nf the order of 150 grams per square metre (b) passivation treatment comprising either a period of exposure to moist air whilst still wet with acid or an electrolytic action set up by the passage of cement from an electrode arranged within the apparatus to the walls of the apparatus whilst filled with acid. The steps (a) and (b) may be taken successively or simultaneously. In the case of sheet metal treated by the above process welded joints employed in the subsequent fabrication of the apparatus are pickled with sodium fluoride and nitric acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR616856X | 1945-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB616856A true GB616856A (en) | 1949-01-27 |
Family
ID=8981894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27610/46A Expired GB616856A (en) | 1945-09-15 | 1946-09-13 | A method for increasing the resistance of stainless steel devices to sulphuric acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB616856A (en) |
-
1946
- 1946-09-13 GB GB27610/46A patent/GB616856A/en not_active Expired
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