EP0900861A1 - Procédé pour combler des pores et/ou des microfissures présents à la surface d'un substrat en métal oxydable - Google Patents
Procédé pour combler des pores et/ou des microfissures présents à la surface d'un substrat en métal oxydable Download PDFInfo
- Publication number
- EP0900861A1 EP0900861A1 EP98402043A EP98402043A EP0900861A1 EP 0900861 A1 EP0900861 A1 EP 0900861A1 EP 98402043 A EP98402043 A EP 98402043A EP 98402043 A EP98402043 A EP 98402043A EP 0900861 A1 EP0900861 A1 EP 0900861A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microcracks
- pores
- metal
- present
- substrate made
- 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- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/04—Electroplating with moving electrodes
- C25D5/06—Brush or pad plating
Definitions
- the present invention relates to a method for filling pores and / or microcracks present on the surface of an oxidizable metal substrate such as aluminum and its alloys or magnesium and its alloys.
- the aforementioned defect in the path of the liquid or gas under pressure takes of particular importance in parts subject to high pressures oil or gas, such as engine parts, transmissions, or assemblies hydraulic and pneumatic of light or heavy transport equipment.
- oil or gas such as engine parts, transmissions, or assemblies hydraulic and pneumatic of light or heavy transport equipment.
- the present invention therefore aims to eliminate all the above-mentioned drawbacks of the prior art. Consequently, it relates to a process for filling pores and / or microcracks present on the surface of a metal substrate oxidizable such as aluminum, aluminum alloys, magnesium and aluminum alloys magnesium, this process being characterized in that it comprises the operation consisting of subjecting said surface, at least at the level of part or all of said pores and / or said microcracks, and in particular at the pores and / or microcracks at the source of seepage or leakage, electrochemical anodization treatment to develop on this surface an oxide layer of said metal.
- a metal substrate oxidizable such as aluminum, aluminum alloys, magnesium and aluminum alloys magnesium
- the anodization treatment will be carried out under conditions such that one obtains an oxide layer having a thickness ensuring the desired seal, for example from 5 to 10 ⁇ m.
- the oxide layer develops on the surface of the substrate treated with a slight expansion compared to the original dimensions; this property improves the sealing of the faces of parts in the event of assembly of these parts.
- the electrochemical treatment mentioned above can be carried out in a electrolysis.
- an electrolytic cell-free technique such as than buffer electrolysis.
- the electrolyte is retained in a absorbent mass in contact with an electrode, the other electrode being constituted by the substrate to be treated; in its application to anodization, the absorbent mass is connected to the cathode of a current source and the substrate to be treated is connected to the anode of this source.
- Buffer electrolysis devices are particularly well suited for treatment of small areas hence the interest of their use in the context of this invention in which it is preferably sought to selectively anodize the areas of the surface to be treated which have pores and / or microcracks causing oozing or wasting.
- the present invention is applicable to all oxidizable metals and mention will be made aluminum, magnesium and their alloys and in particular aluminum alloys such as AS9, AS10 or AS11.
- Figures 1 and 2 are respectively schematic elevational views and a section longitudinal of a buffer electrolysis device in its simplest design to carry out the electrochemical anodization treatment according to the invention.
- a substrate e.g. aluminum alloy
- This device comprises, in a manner known per se, a graphite tablet or of platinum 1 forming a cathode; this pellet is enclosed in a cap 2 made of material insulating and rests on a flange 3 of this cap.
- a cooling member 4 consisting of a good heat conducting mass and which is provided with cooling fins 5.
- This mass is advantageously consisting of a metal that is both light and good conductor, such as aluminum.
- the rim 3 is shaped to constitute claws holding in place an absorbent pad 6 retaining an electrolyte.
- the latter is chosen to form an oxide layer having the required qualities to neutralize surface defects to be treated.
- This electrolyte may for example be consisting of an aqueous solution containing one or more acids such as acid sulfuric, boric acid, oxalic acid and chromic acid or a mixture of two at least of these acids.
- the upper part of the member 4 is covered with an insulating cap 7 through which passes a female plug 8 for the connection with the negative pole of a source of electricity.
- this source could for example be a current source continuous with a voltage of 40 to 80 volts and an intensity of 10 to 25A, for an intensity at the end of treatment from 0 to 3A.
- the substrate to be treated 9 As for the substrate to be treated 9, it is connected to the positive pole of said current source.
- the advantages of the present invention are manifold. Thus, it allows to remedy defects related to microcracks and / or pores, directly in the assembly workshops and avoids the transport of parts to be treated; she is selective when he uses buffer electrolysis and therefore only treats the areas causing seepage or leakage; and it removes expensive cleaning and polluting parts essential before and after the impregnation / projection operation of current techniques.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Claims (3)
- Procédé pour combler des pores et/ou des microfissures présents à la surface d'un substrat en un métal oxydable tel que l'aluminium et ses alliages, le magnésium et ses alliages, caractérisé en ce qu'il comprend l'opération consistant à soumettre ladite surface dudit substrat, au moins au niveau d'une partie ou de la totalité desdits pores et/ou desdites microfissures, à un traitement électrochimique d'anodisation pour développer sur cette surface une couche d'oxyde dudit métal.
- Procédé selon la revendication 1, caractérisé en ce que ledit traitement électrochimique est réalisé par une technique hors-cuve à électrolyse.
- Procédé selon la revendication 2, caractérisé en ce que la technique hors cuve d'électrolyse est constituée par l'électrolyse au tampon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9710349 | 1997-08-13 | ||
FR9710349A FR2767340B1 (fr) | 1997-08-13 | 1997-08-13 | Procede pour combler des pores et/ou des microfissures presents a la surface d'un substrat en metal oxydable |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0900861A1 true EP0900861A1 (fr) | 1999-03-10 |
Family
ID=9510287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402043A Withdrawn EP0900861A1 (fr) | 1997-08-13 | 1998-08-12 | Procédé pour combler des pores et/ou des microfissures présents à la surface d'un substrat en métal oxydable |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0900861A1 (fr) |
FR (1) | FR2767340B1 (fr) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3637468A (en) * | 1968-04-29 | 1972-01-25 | Dalic Sa | Electrodes for electrolytic processes |
-
1997
- 1997-08-13 FR FR9710349A patent/FR2767340B1/fr not_active Expired - Fee Related
-
1998
- 1998-08-12 EP EP98402043A patent/EP0900861A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3637468A (en) * | 1968-04-29 | 1972-01-25 | Dalic Sa | Electrodes for electrolytic processes |
Non-Patent Citations (2)
Title |
---|
NORRIS J C: "BRUSH ANODIZING IN THE AIRCRAFT/AEROSPACE INDUSTRIES", PLATING AND SURFACE FINISHING, vol. 78, no. 8, 1 August 1991 (1991-08-01), pages 36 - 38, XP000233784 * |
WERNICK AND PINNER: "The surface treatment and finishing of aluminium and its alloys", 1987, FINISHING PUBLICATIONS LTD, TEDDINGTON, GB, XP002059886, 155770 * |
Also Published As
Publication number | Publication date |
---|---|
FR2767340B1 (fr) | 1999-10-22 |
FR2767340A1 (fr) | 1999-02-19 |
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