BE357549A - PROCESS FOR IMPROVING THE CORROSION RESISTANCE OF PARTS SHAPED IN MAGNESIUM ALLOYS - Google Patents
PROCESS FOR IMPROVING THE CORROSION RESISTANCE OF PARTS SHAPED IN MAGNESIUM ALLOYSInfo
- Publication number
- BE357549A BE357549A BE357549DA BE357549A BE 357549 A BE357549 A BE 357549A BE 357549D A BE357549D A BE 357549DA BE 357549 A BE357549 A BE 357549A
- Authority
- BE
- Belgium
- Prior art keywords
- corrosion resistance
- improving
- magnesium alloys
- parts
- parts shaped
- Prior art date
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
- C23C22/24—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 hexavalent chromium compounds
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)
- Chemical Treatment Of Metals (AREA)
- Heat Treatment Of Articles (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
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Procédé pour anéliorer la résistance à la corrosion de pie- ces façonnées en alliages de magnésium.
Les pièces en alliages à fort pourcentage de magnésium présentent férquemment sur la surface des impuretés qui pro- voquent une corrosion accélérée. Les pièces coulées sont par exemple recouvertes d'une croate ou pellicule de coulée qui contient des composés du magnésium facilement attaquables' Les pièces façonnées à la presse, pas laminage ou par d'au¯ tres moyens présentent fréquemment une pellicule czui con- tient du fer et des produits organiques carbonisés dont la présence même en traces, augmente 1' action corrosive des substances attaquant les pièces prob blement par suite de
<Desc/Clms Page number 2>
la formation d'éléments locaux.
Il a maintenant été découvert que ce défaut de résistan- ce à la corrosion peut, par exemple dans le cas des pièces coulées, être éliminé lorsque ces pièces sont mises à cuire pendant quelque temps, par exemple pendant une ou plusieurs n.eures, dans une solution aqueuse de bichromates (contenant jusqu'à environ 100 gr. de CrO3 par litre).
Ce traitement de la surface peut encore être amélioré par un traitement préalable des pièces dans de l'acide nitrique dilué, par exemple à 10 % qui a pour action de décaper d'abord la crou- . te de coulée et de débarrasser les pièces de différentes im- puretés provenant des moules de sable lors de la coulée'
Dans le cas de pièces façonnées par laminage, à la pres- se, par coulée, par injection, et par d' autres moyens dt fai tes en ces alliages, les surfaces peuvent également être amc- nées par traitement au bain de bichromate bouillant, que l'on a fait précéder éventuellement d'un décapage à l'acide nitri- que,
dans un état extrêmement résistant à 1' attaque de solu- tions aqueuses' L- surface modifiée résultant du traitement au bichromate présente encore la propriété avantageuse de re- tenir de façon durable des couches de laque appliquées sur les pieces.
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A method of improving the corrosion resistance of shaped parts of magnesium alloys.
Parts made of alloys with a high percentage of magnesium frequently have impurities on the surface which cause accelerated corrosion. The castings are for example covered with a Croatian or casting film which contains easily attackable magnesium compounds. Parts formed by press, by rolling or by other means frequently have a film which contains magnesium. iron and carbonized organic products, the presence of which, even in traces, increases the corrosive action of substances attacking the parts, probably as a result of
<Desc / Clms Page number 2>
the formation of local elements.
It has now been discovered that this defect in corrosion resistance can, for example in the case of castings, be eliminated when these parts are fired for some time, for example for one or more hours, in the case of castings. an aqueous solution of dichromates (containing up to about 100 gr. of CrO3 per liter).
This surface treatment can be further improved by pre-treating the parts in dilute nitric acid, for example at 10%, which has the action of first pickling the nut. te casting and to rid the pieces of different impurities from the sand molds during casting '
In the case of parts shaped by rolling, by pressing, by casting, by injection, and by other means made from these alloys, the surfaces can also be provided by treatment in a boiling dichromate bath, which may be preceded by pickling with nitric acid,
In a state extremely resistant to attack by aqueous solutions, the modified surface resulting from the dichromate treatment still exhibits the advantageous property of durably retaining layers of lacquer applied to the parts.
Claims (1)
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1783770X | 1923-02-02 | ||
| DE287450X | 1927-03-19 | ||
| DE668868X | 1928-02-02 | ||
| DE305197X | 1928-02-02 | ||
| DEI33414D DE493827C (en) | 1923-02-02 | 1928-02-03 | Process for improving the corrosion resistance of fittings made of magnesium alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE357549A true BE357549A (en) | 1929-02-28 |
Family
ID=61187897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE357549D BE357549A (en) | 1923-02-02 | 1929-01-21 | PROCESS FOR IMPROVING THE CORROSION RESISTANCE OF PARTS SHAPED IN MAGNESIUM ALLOYS |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE357549A (en) |
| DE (1) | DE493827C (en) |
| FR (1) | FR668868A (en) |
| GB (2) | GB287450A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2796369A (en) * | 1953-04-15 | 1957-06-18 | Poor & Co | Method of protecting zinc-copper alloys against corrosion and product thereof |
| US2887418A (en) * | 1956-12-24 | 1959-05-19 | Dow Chemical Co | Composition for and method of chrome pickling of magnesium shapes |
-
1928
- 1928-02-03 DE DEI33414D patent/DE493827C/en not_active Expired
- 1928-03-09 GB GB7423/28A patent/GB287450A/en not_active Expired
- 1928-11-22 GB GB34412/28A patent/GB305197A/en not_active Expired
-
1929
- 1929-01-21 BE BE357549D patent/BE357549A/en unknown
- 1929-02-01 FR FR668868D patent/FR668868A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR668868A (en) | 1929-11-07 |
| GB305197A (en) | 1929-08-15 |
| GB287450A (en) | 1928-10-18 |
| DE493827C (en) | 1930-03-12 |
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