DE19749078A1 - Arrangement for preventing contact corrosion between steel and magnesium - Google Patents
Arrangement for preventing contact corrosion between steel and magnesiumInfo
- Publication number
- DE19749078A1 DE19749078A1 DE1997149078 DE19749078A DE19749078A1 DE 19749078 A1 DE19749078 A1 DE 19749078A1 DE 1997149078 DE1997149078 DE 1997149078 DE 19749078 A DE19749078 A DE 19749078A DE 19749078 A1 DE19749078 A1 DE 19749078A1
- Authority
- DE
- Germany
- Prior art keywords
- steel
- intermediate layer
- magnesium
- aluminum
- contact corrosion
- 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.)
- Withdrawn
Links
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 13
- 230000007797 corrosion Effects 0.000 title claims description 11
- 238000005260 corrosion Methods 0.000 title claims description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 9
- 229910052749 magnesium Inorganic materials 0.000 title description 8
- 239000011777 magnesium Substances 0.000 title description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 8
- 239000004033 plastic Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 239000000123 paper Substances 0.000 claims 1
- 235000010210 aluminium Nutrition 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
Die Erfindung betrifft eine Anordnung zur Verhinderung der Kontaktkorrosion zwischen Bauteilen aus Stahl und Magnesiumlegierungen.The invention relates to an arrangement for preventing contact corrosion between steel and magnesium alloy components.
Aufgrund seiner guten gießtechnischen Eigenschaften und seines geringen spezifischen Gewichtes ist es im Kraftfahrzeugbaus seit langem üblich, Getriebe gehäuse aus einer Magnesium-Guß-Legierung herzustellen. Dabei ist jedoch von Nachteil, daß an den Stellen, an denen Stahl- und Magnesiumteile direkt anein ander anliegen, insbesondere bei feuchter, salzhaltiger Atmosphäre, wie sie im Winterbetrieb auf salzgestreuten Straßen vorliegen, Korrosionserscheinungen auftreten, die zu einer erheblichen Zerstörung des Magnesium-Werkstoffes führen. So ist es beispielsweise denkbar, daß bei durch Stahlschrauben zu sammengehaltenen Gehäuseteilen aus einer Magnesiumlegierung in Anwesen heit feuchter, aggressiver Atmosphäre die Auflageflächen an den Schraubenköp fen bzw. an den Muttern durch Kontaktkorrosion zerstört werden und daß als deren Folge die Spannung der Verbindungsschrauben und damit die Verbin dung der Gehäuseteile selbst nachläßt.Because of its good casting properties and its low specific weight, it has long been common in motor vehicle construction, gears Manufacture housing from a cast magnesium alloy. However, is from Disadvantage that at the points where steel and magnesium parts are in direct contact other concerns, especially in a humid, salty atmosphere, such as in Winter operation on salt-spread roads is present, signs of corrosion occur that lead to a considerable destruction of the magnesium material to lead. So it is conceivable, for example, that with steel screws Housing parts made of a magnesium alloy held together in property damp, aggressive atmosphere, the contact surfaces on the screw heads fen or on the nuts are destroyed by contact corrosion and that as the consequence of which is the tension of the connecting screws and thus the connector the housing parts themselves.
Diese Kontaktkorrosion zwischen Bauteilen aus Stahl und Magnesiumlegierun gen wird nach den bisherigen Stand der Technik dadurch verhindert, daß die Bauteile gegen den Zutritt feuchter aggressiver Medien geschützt werden. So ist es beispielsweise aus der D-OS 23 61 282 vorbekannt, Verbindungsschrauben, die zwei Gehäuseteile aneinander halten, mit einer eng anliegenden Dichtkappe zu versehen. Durch diese Dichtkappe wird der Zutritt von Elektrolyt verhindert, so daß die Kontaktkorrosion nicht stattfinden kann.This contact corrosion between components made of steel and magnesium alloy gene is prevented according to the prior art in that the Components are protected against the entry of moist, aggressive media. So is it is known, for example, from D-OS 23 61 282, connecting screws, hold the two housing parts together with a tight-fitting sealing cap to provide. This sealing cap prevents the entry of electrolyte, so that contact corrosion cannot take place.
Ein ähnliches Konzept zum Schutz gegen Kontaktkorrosion von Bauteilen ist in einem Prospekt der Firmen Radolid Thiel GbmH und Hydro Magnesium be schrieben. Dieses Konzept basiert ebenfalls auf einer speziell konstruierten Schutzkappe aus Kunststoff mit Klemmrand und Dichtlippe, die auf einen im Magnesium eingeschraubten Stahlbolzen aufgesetzt ist. Dadurch wird verhin dert, daß korrosive Flüssigkeit in den unteren und oberen Bereich der Stahl schraube eindringen kann.A similar concept for protection against contact corrosion of components is in a prospectus from Radolid Thiel GbmH and Hydro Magnesium be wrote. This concept is also based on a specially designed one Protective cap made of plastic with a clamping edge and sealing lip that fits on an inside Magnesium screwed steel bolt is placed. This will prevent that corrosive liquid in the lower and upper area of the steel screw can penetrate.
Nachteilig dabei ist, daß solche Schutzkappen aufwendig gefertigt und der entsprechenden Form der Bauteile angepaßt werden müssen.The disadvantage here is that such protective caps are manufactured and the corresponding shape of the components must be adjusted.
Aufgabe der Erfindung ist es daher, die Kontaktkorrosion zwischen Bauteilen aus Stahl und Magnesiumlegierungen mit einfacheren Mitteln zu verhindern.The object of the invention is therefore to determine the contact corrosion between components Prevent steel and magnesium alloys with simpler means.
Erfindungsgemäß wird diese Aufgabe nach dem kennzeichnenden Teil von Anspruch 1 dadurch gelöst, daß die Bauteile durch eine isolierende Zwischen schicht elektrochemisch voneinander getrennt sind, wobei die Zwischenschicht aus metallischem Aluminium mit wenigstens 98% Aluminium besteht.According to the invention, this task is performed according to the characterizing part of Claim 1 solved in that the components by an insulating intermediate layer are electrochemically separated from each other, the intermediate layer consists of metallic aluminum with at least 98% aluminum.
Die Schutzwirkung beruht darauf, daß Reinaluminium eine dichte Oxidhaut bildet, die quasi nicht leitend ist, da reines Aluminiumoxyd wie Keramik einen sehr hohen Isolierungswiderstand besitzt. Auf der Gegenseite besitzt ebenfalls Magnesium aufgrund seiner hohen Affinität zum Sauerstoff eine dichte Oxid haut, so daß ein gegenseitiges Durchbrechen oder Zerstören dieser Oxidschich ten bei höheren Flächenbelastungen keine Rolle spielt, da sich sofort wieder durch den Kontakt mit Luftsauerstoff ein neuer Oxidfilm bildet.The protective effect is based on the fact that pure aluminum is a dense oxide skin forms, which is quasi non-conductive, because pure aluminum oxide like ceramics has very high insulation resistance. On the opposite side also owns Magnesium is a dense oxide due to its high affinity for oxygen skin, so that a mutual breakthrough or destruction of this oxide layer at high wing loads is irrelevant because it reacts immediately forms a new oxide film through contact with atmospheric oxygen.
In Weiterbildung der Erfindung ist nach Anspruch 2 vorgesehen, daß die Zwi schenschicht eine Folie im Dickenbereich von 50 bis 500 µm ist. Diese Folien haben den Vorteil, daß sie konturgenau den zu verbindenden Teilen angepaßt werden können und zusätzlich noch die Funktion einer Dichtung übernehmen können.In a development of the invention it is provided according to claim 2 that the Zwi layer is a film in the thickness range of 50 to 500 microns. These slides have the advantage that they are precisely contoured to the parts to be connected can be and also take over the function of a seal can.
Aus Anspruch 3 geht hervor, daß die Zwischenschicht einen aus Papier, Textil- oder Kunststoffgewebe bestehenden Kern aufweist, der zumindest einseitig mit Aluminium beschichtet ist. In diesem Fall wird eine Art Verstärkung der Alumi niumschicht durch den Werkstoffverbund erreicht.It is apparent from claim 3 that the intermediate layer is made of paper, Has textile or plastic fabric existing core that at least on one side Aluminum is coated. In this case, a kind of reinforcement of the alumi nium layer reached by the composite material.
Auch kann es in Weiterbildung der Erfindung nach Anspruch 4 vorteilhaft sein, wenn die Zwischenschicht aus einem Stahlband besteht, das zumindest einseitig mit Aluminium plattiert ist.In a development of the invention according to claim 4, it can also be advantageous if the intermediate layer consists of a steel strip that is at least on one side is clad with aluminum.
Wie Anspruch 5 zeigt, soll das Bauteil ein Getriebegehäuse aus einer Magnesi um-Guß-Legierung für eine Brennkraftmaschine sein. Insbesondere im Fahrzeug bau werden aus Gewichtsgründen derartige Gehäuse mehr und mehr anstelle von Stahlgehäusen eingesetzt, so daß eine Verringerung bzw. Verhinderung der Kontaktkorrosion zwischen Stahl und Magnesium ein unbedingtes Erfordernis ist.As shown in claim 5, the component is intended to be a magnesi gear housing to be cast alloy for an internal combustion engine. Especially in the vehicle Due to weight reasons, such housings are being used more and more instead of steel housings used, so that a reduction or prevention of Contact corrosion between steel and magnesium is an absolute requirement is.
Die Erfindung wird an nachstehendem Ausführungsbeispiel näher erläutert.The invention is explained in more detail using the following exemplary embodiment.
Die einzige Figur zeigt einen Schnitt durch zwei miteinander verbundene Gehäuseteile. The single figure shows a section through two interconnected Housing parts.
In der Figur ist ein aus einem Gehäuseoberteil 1 und einem Gehäuseunterteil 2 zusammengesetztes Gehäuse aus einer Magnesiumdruckgußlegierung gezeigt, das durch Befestigungsschrauben 3 aus Stahl zusammengehalten ist. In einer Ausnehmung 5 des Gehäuseoberteils 1 ist der Schraubenkopf 4 der Befesti gungsschraube 3 angeordnet, welcher allseitig von einer aus Aluminium beste henden Zwischenschicht 6 in Form einer Folie umgeben ist. Durch Anwe senheit dieser Zwischenschicht 6 wird die Kontaktkorrosion zwischen stählerner Befestigungsschraube 3 und Magnesiumgehäuseoberteil 1 vermieden, auch wenn beispielsweise oberhalb des Schraubenkopfes 4 in der Ausnehmung 5 Elektrolyt vorhanden ist. In the figure, a housing made of a magnesium die-cast alloy is shown which is composed of an upper housing part 1 and a lower housing part 2 and is held together by steel fastening screws 3 . In a recess 5 of the upper housing part 1 , the screw head 4 of the fastening screw 3 is arranged, which is surrounded on all sides by an existing intermediate layer 6 made of aluminum in the form of a film. By presence of this intermediate layer 6 , contact corrosion between the steel fastening screw 3 and the magnesium housing upper part 1 is avoided, even if, for example, electrolyte is present in the recess 5 above the screw head 4 .
11
Gehäuseoberteil
Upper part of the housing
22nd
Gehäuseunterteil
Lower part of the housing
33rd
Befestigungsschraube
Fastening screw
44th
Schraubenkopf
Screw head
55
Ausnehmung
Recess
66
Zwischenschicht
Intermediate layer
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1997149078 DE19749078A1 (en) | 1997-11-06 | 1997-11-06 | Arrangement for preventing contact corrosion between steel and magnesium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1997149078 DE19749078A1 (en) | 1997-11-06 | 1997-11-06 | Arrangement for preventing contact corrosion between steel and magnesium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19749078A1 true DE19749078A1 (en) | 1999-05-12 |
Family
ID=7847827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1997149078 Withdrawn DE19749078A1 (en) | 1997-11-06 | 1997-11-06 | Arrangement for preventing contact corrosion between steel and magnesium |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE19749078A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007016126A1 (en) * | 2007-03-29 | 2008-10-02 | Robert Bosch Gmbh | Arrangement with at least one metal part in contact with at least one plastic component |
| DE102007045673A1 (en) | 2007-09-25 | 2009-04-09 | Schaeffler Kg | Actuating device for change speed gearbox of motor vehicle, has gearshift lever attached to carrier part with borehole by axle element, where component is provided between axle element and gearshift lever |
| CN117127184A (en) * | 2023-04-28 | 2023-11-28 | 荣耀终端有限公司 | Corrosion prevention method, magnesium-containing component and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536459A (en) * | 1967-11-29 | 1970-10-27 | United States Steel Corp | Stainless steel composite |
| DE4227259C1 (en) * | 1992-08-18 | 1994-03-24 | Stahlschmidt & Maiworm | Arrangement to avoid contact corrosion on magnesium wheels |
| DE4306484C1 (en) * | 1993-03-02 | 1994-04-07 | Stahlschmidt & Maiworm | Arrangement to reduce contact corrosion between magnesium@ and steel wheel mount - has aluminium@ ring fixed to wheel outer and aluminium plate covering whole hub contact surface |
-
1997
- 1997-11-06 DE DE1997149078 patent/DE19749078A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3536459A (en) * | 1967-11-29 | 1970-10-27 | United States Steel Corp | Stainless steel composite |
| DE4227259C1 (en) * | 1992-08-18 | 1994-03-24 | Stahlschmidt & Maiworm | Arrangement to avoid contact corrosion on magnesium wheels |
| DE4306484C1 (en) * | 1993-03-02 | 1994-04-07 | Stahlschmidt & Maiworm | Arrangement to reduce contact corrosion between magnesium@ and steel wheel mount - has aluminium@ ring fixed to wheel outer and aluminium plate covering whole hub contact surface |
Non-Patent Citations (1)
| Title |
|---|
| PATOS Abstract, DE 2305428 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007016126A1 (en) * | 2007-03-29 | 2008-10-02 | Robert Bosch Gmbh | Arrangement with at least one metal part in contact with at least one plastic component |
| DE102007045673A1 (en) | 2007-09-25 | 2009-04-09 | Schaeffler Kg | Actuating device for change speed gearbox of motor vehicle, has gearshift lever attached to carrier part with borehole by axle element, where component is provided between axle element and gearshift lever |
| CN117127184A (en) * | 2023-04-28 | 2023-11-28 | 荣耀终端有限公司 | Corrosion prevention method, magnesium-containing component and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| 8139 | Disposal/non-payment of the annual fee |