EP1571235A2 - Procédé d'étamage de pièces tubulaires en cuivre - Google Patents
Procédé d'étamage de pièces tubulaires en cuivre Download PDFInfo
- Publication number
- EP1571235A2 EP1571235A2 EP05003348A EP05003348A EP1571235A2 EP 1571235 A2 EP1571235 A2 EP 1571235A2 EP 05003348 A EP05003348 A EP 05003348A EP 05003348 A EP05003348 A EP 05003348A EP 1571235 A2 EP1571235 A2 EP 1571235A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- copper
- tin
- typically
- dispersion
- process according
- 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.)
- Granted
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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/54—Contact plating, i.e. electroless electrochemical plating
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/48—Coating with alloys
Definitions
- the invention relates to the field of tubular products for sanitary use for the distribution of drinking water, typically copper tubes.
- Sanitary copper tubes for the distribution of aggressive water must be treated internally so that the distributed drinking water contains typically less than 2 mg / l of copper.
- the tinning processes commonly used are chemical processes or hot melt deposition processes.
- the galvanic deposition methods by electrolysis of a tin salt are not used because they are too expensive, the tubes in particular having a geometry that is too unfavorable for this type of process.
- the tube to be treated is heated to at least 240 ° C and internally coated with tin to the liquid state, then is cooled.
- European Patent EP 0 915 183 in which the tube is coated under Inert gas atmosphere of a tin bath containing a tin methane sulfonate as a source of tin.
- the chemical process presents problems of an economic nature and ecological. Indeed, on the one hand, the baths used for the chemical process are complex and form equally complex effluents which are therefore either very expensive to treat is very polluting.
- the hot process also has disadvantages. On the one hand, it requires wearing relatively high temperature, which has a significant cost that this either in terms of production costs or investment cost. On the other hand, high temperature rise tends to partially recrystallize the metal and thus reduce the mechanical characteristics of copper tubes. Finally, this process leads to tin layers unnecessarily thick, which leads to an additional cost for the final tube.
- the aim of the invention is to propose a particularly economical method which avoids the expensive treatment of effluents as in the case of the chemical process, which avoids, as in the hot process, to bring the tubes to a high temperature which recrystallises and softens the metal, and finally eliminates the mechanical pre-treatments of preparation of surfaces to be tinned, such as sanding.
- tinning a tubular piece of copper or alloy typically tubular copper is brought into contact with a surface of said copper piece or copper alloy with an aqueous dispersion comprising tin in the solid state and divided, typically in the form of shot, and a partial solution agent said tin, said dispersion being at a temperature above 60 ° C and typically less than 130 ° C, so as to form in situ stannous ions capable of leading to a tin deposit by ion exchange with the copper of said piece.
- the dispersion used according to the invention contains, at the end of the treatment, in addition to tin in the solid state, which is therefore easy to separate and isolate by filtration, that a solution containing essentially a copper salt and said partial dissolving agent. It is sufficient to recover the copper in order to be able to recycle this solution or to isolate the said partial dissolution agent.
- the copper ions of the dispersion can be recovered for example using an ion exchange resin.
- the process is carried out at a relatively low temperature, and in any case at a temperature too low to recrystallize copper and thus reduce its mechanical characteristics.
- the process according to the invention makes it possible to avoid the preparation of the surfaces to be treated by mechanical treatment to the extent that the use of tin in the form of shot can be used to simultaneously obtain a stripping of the surface to be treated and his tinning.
- said piece may be a tubular piece and said surface may be a inner surface, and in this case, said dispersion is circulated in contact with said inner surface.
- said dispersion is circulated during a selected time to obtain a tin layer of at least 0.3 ⁇ m and typically between 0.5 ⁇ m and 1 ⁇ m, this time can range from minutes to tens of minutes.
- said operating temperature of the process can range from 95 ° C. to 100 ° C. and in this case said contacting is carried out at atmospheric pressure.
- Said solution agent for the solution of tin is a salt which makes it possible to obtain a pH ranging from 3 to 5, and typically 3.5 to 4.5 at a molar content ranging from 0.01 to 1 mole per liter.
- said salt is potassium bitartrate or wine stone, present at a molar content ranging from 0.1 to 0.3 moles per liter.
- This compound has the advantage of being a non-toxic natural product, so it will not be necessary to eliminate traces bitartrate in copper or copper alloy parts after the implementation of the process according to the invention.
- this bitartrate perinettait it was observed by the plaintiff that this bitartrate perinettait to quickly obtain a layer of tin of regular thickness, of the order of 1 ⁇ m, without the risk of having a lack of tin or an extra thickness.
- said dispersion comprises an accelerator salt of dissolution of tin.
- a salt may be chosen from sodium chloride or ammonium chloride.
- said split tin is tin grit of average particle size ranging from 0.5 mm to 5 mm.
- a size is chosen which generally results from a compromise between the aptitude for the shot to be conveyed, for example in a tube, and not to be deposited, which excludes an excessively large particle size, typically above beyond 5 mm, and if necessary, its stripping action, which excludes a particle size too small, typically below 0.1 mm.
- said tin comprises copper, typically at a weight content ranging from 0.1 to 5%, and preferably from 0.5 to 2%, so as to accelerate the dissolution of ions stannous and therefore the formation of the tin deposit.
- the method according to the invention makes it possible to treat a non stripped, because the presence of a thin film of copper oxide makes it possible to accelerate the solution of cupric ions and thus the dissolution of the tin granules. By against, it is preferable that said copper part is previously degreased.
- said copper piece itself constitutes a container for said dispersion.
- Said piece of copper or copper alloy may itself constitute all or part of a container or conduit to allow the circulation or agitation of said dispersion.
- Said copper piece may be selected typically from: tubes, fittings, valves, sanitary installations, all tubular type parts comprising an inner surface that can be brought into contact with said dispersion.
- said tubular pieces are made of low-alloy copper, most often copper tubes.
- An aqueous dispersion was prepared by introducing into an aqueous solution 0.25 M of potassium bitartrate from tin shot in the form of granules of size particle size (larger dimension) ranging from 2 mm to 3 mm.
- the quantity of shot to be used is such that the total surface of the granules corresponds on the surface to be tinned.
- the used tube of 16 mm internal diameter it is the order of 1.5 kg per meter of tube.
- This dispersion was then brought towards 100 °, close to boiling, and was made circulate in a pre-degreased copper tube for 10 minutes, the the dispersion being maintained at the same temperature around 100 ° C in a tank, the volume of the dispersion corresponding to the internal volume of the tube and the volume of the dispersion in the bin.
- the tube was then rinsed with water.
- a tin deposit of about 0.6 ⁇ m thickness is obtained on the inner surface of the tube, which deposit is perfectly adherent to its copper substrate.
- the final dispersion was treated by separating the tin shot by filtration and by cold separation of the precipitated potassium bitartrate, and recovering the copper by passing the solution obtained after separation from the ion exchange resin on an ion exchange resin. bitartrate precipitated. Potassium bitartrate and granules could be reused.
- the tubes thus obtained had good properties of use both with regard to corrosion resistance with regard to the formation of a barrier to copper.
- the invention thus has very great economic and ecological advantages compared to prior art methods as it has become clear in what precedes.
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- 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)
- Electrochemistry (AREA)
- Chemically Coating (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Les procédés d'étamage couramment utilisés sont les procédés par voie chimique ou les procédés à chaud par dépôt d'étain fondu.
Les procédés de dépôt galvanique par électrolyse d'un sel d'étain ne sont pas utilisés car trop coûteux, les tubes présentant notamment une géométrie trop défavorable pour ce type de procédé.
En effet, d'une part, la dispersion utilisée selon l'invention ne contient en fin de traitement, outre l'étain à l'état solide qui est de ce fait facile à séparer et isoler par filtration, qu'une solution contenant essentiellement qu'un sel de cuivre et ledit agent de dissolution partielle. Il suffit de récupérer le cuivre pour pouvoir soit recycler cette solution, soit isoler ledit agent de dissolution partielle. Par exemple, les ions de cuivre de la dispersion peuvent être récupérés par exemple à l'aide d'une résine échangeuse d'ions.
Cependant, selon l'invention, il est possible d'opérer sous pression à une température légèrement supérieure à 100°C.
En pratique, on choisit une taille qui résulte généralement d'un compromis entre l'aptitude pour la grenaille à être véhiculée, par exemple dans un tube, et à ne pas se déposer, ce qui exclut une taille particulaire trop élevée, typiquement au-delà de 5 mm, et le cas échéant, son action décapante, ce qui exclut une taille particulaire trop faible, typiquement en deçà de 0,1 mm. On choisit également une taille particulaire comespondant à une forme d'étain économique.
Ainsi, seule la surface en contact avec l'eau potable sera étamée, et par ailleurs, le procédé selon l'invention ne nécessite donc ni cuves de traitement dans lesquelles plongeraient les pièces à traiter, ni de grands volumes de dispersion aqueuse, ce qui est particulièrement avantageux sur un plan pratique..
Ladite pièce en cuivre peut être choisie typiquement parmi : les tubes, les raccords, la robinetterie, les installations sanitaires, toutes pièces de type tubulaire comprenant une surface intérieure pouvant être mise en contact avec ladite dispersion.
Typiquement, lesdites pièces tubulaires sont en cuivre faiblement allié, le plus souvent des tubes en cuivre.
Par ailleurs, la dispersion finale a été traitée en séparant par filtration la grenaille d'étain et en séparant à froid le bitartrate de potassium précipité, et en récupérant le cuivre par passage sur une résine échangeuse d'ions de la solution obtenue après séparation du bitartrate précipité.
Le bitartrate de potassium et les granules ont pu être réutilisés.
Claims (14)
- Procédé d'étamage d'une pièce en cuivre ou alliage de cuivre typiquement tubulaire dans lequel une surface de ladite pièce en cuivre ou alliage de cuivre est mise en contact avec une dispersion aqueuse comprenant de l'étain à l'état solide et divisé, typiquement sous forme de grenaille, et un agent de mise en solution partielle dudit étain, ladite dispersion étant à une température supérieure à 60°C et typiquement inférieure à 130°C, de manière à former in situ des ions stanneux aptes à conduire à un dépôt d'étain par échange ionique avec le cuivre de ladite pièce.
- Procédé selon la revendication 1 dans lequel ladite pièce est une pièce tubulaire et ladite surface est une surface intérieure, et dans lequel on fait circuler ladite dispersion au contact de ladite surface intérieure.
- Procédé selon la revendication 2 dans lequel on fait circuler ladite dispersion pendant un temps choisi pour obtenir une couche d'étain d'au moins 0,3 µm et typiquement entre 0,5 µm et 1 µm.
- Procédé selon une quelconque des revendications 1 à 3 dans lequel ladite température va de 95°C à 100°C, et dans lequel ladite mise en contact est réalisée à la pression atmosphérique.
- Procédé selon une quelconque des revendications 1 à 4 dans lequel ledit agent de mise en solution est un sel permettant d'obtenir un pH allant de 3 à 5, et typiquement de 3,5 à 4,5 à une teneur molaire allant de 0,1 à 0,3 moles par litre.
- Procédé selon la revendication 5 dans lequel ledit sel est du bitartrate de potassium ou pierre de vin, présent à une teneur molaire de 0,1 ±0,05 moles par litre.
- Procédé selon une quelconque des revendications 1 à 6 dans lequel ladite dispersion comprend un sel accélérateur de dissolution de l'étain.
- Procédé selon la revendication 7 dans lequel ledit sel est choisi parmi le chlorure de sodium ou le chlorure d'ammonium.
- Procédé selon une quelconque des revendications 1 à 8 dans lequel ledit étain à l'état divisé est de la grenaille d'étain de taille particulaire moyenne allant de 0,5 mm à 5 mm.
- Procédé selon une quelconque des revendications 1 à 9 dans lequel ledit étain comprend du cuivre, typiquement à une teneur pondérale allant de 0,1 à 5%, et de préférence de 0,5 à 2%.
- Procédé selon une quelconque des revendications 1 à 10 dans lequel ladite pièce en cuivre ou alliage de cuivre est une pièce dégraissée et typiquement non décapée.
- Procédé selon une quelconque des revendications 1 à 11 dans lequel ladite pièce en cuivre ou alliage de cuivre constitue elle-même tout ou partie d'un contenant ou d'un conduit pour permettre la circulation ou l'agitation de ladite dispersion.
- Procédé selon la revendication 12 dans lequel ladite pièce en cuivre ou alliage de cuivre est choisie typiquement parmi : les tubes, les raccords, la robinetterie, les installations sanitaires, toutes pièces de type tubulaire comprenant une surface intérieure pouvant être mise en contact avec ladite dispersion.
- Procédé selon la revendication 13 dans lequel lesdites pièces tubulaires sont en cuivre.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0402317 | 2004-03-05 | ||
FR0402317A FR2867198B1 (fr) | 2004-03-05 | 2004-03-05 | Procede d'etamage de pieces tubulaires en cuivre |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1571235A2 true EP1571235A2 (fr) | 2005-09-07 |
EP1571235A3 EP1571235A3 (fr) | 2008-03-19 |
EP1571235B1 EP1571235B1 (fr) | 2019-07-17 |
Family
ID=34746497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05003348.9A Active EP1571235B1 (fr) | 2004-03-05 | 2005-02-17 | Procédé d'étamage de pièces tubulaires en cuivre |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1571235B1 (fr) |
FR (1) | FR2867198B1 (fr) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0915183A1 (fr) | 1997-11-07 | 1999-05-12 | ATOTECH Deutschland GmbH | Etamage de tubes en cuivre |
EP1167563A1 (fr) | 2000-06-20 | 2002-01-02 | Outokumpu Oyj | Procédé de fabrication de tuyaux en cuivre ou en alliage de cuivre avec revêtement intérieur |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2072229A (en) * | 1934-04-18 | 1937-03-02 | Waitman Louie | Tinning method and composition therefor |
US2434855A (en) * | 1946-10-11 | 1948-01-20 | Kosterlitzky Jose L Teran | Process of coating metal articles |
FR1056203A (fr) * | 1952-01-11 | 1954-02-25 | Tainton Company | Perfectionnements apportés aux procédés pour l'obtention de placages métalliques |
JPS5818993B2 (ja) * | 1979-07-24 | 1983-04-15 | 日本鉱業株式会社 | 錫メツキ方法 |
DE19653765A1 (de) * | 1996-12-23 | 1998-06-25 | Km Europa Metal Ag | Innen verzinntes Kupferrohr und Verfahren zur Beschichtung eines Kupferrohrs |
-
2004
- 2004-03-05 FR FR0402317A patent/FR2867198B1/fr not_active Expired - Fee Related
-
2005
- 2005-02-17 EP EP05003348.9A patent/EP1571235B1/fr active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0915183A1 (fr) | 1997-11-07 | 1999-05-12 | ATOTECH Deutschland GmbH | Etamage de tubes en cuivre |
EP1167563A1 (fr) | 2000-06-20 | 2002-01-02 | Outokumpu Oyj | Procédé de fabrication de tuyaux en cuivre ou en alliage de cuivre avec revêtement intérieur |
Also Published As
Publication number | Publication date |
---|---|
FR2867198A1 (fr) | 2005-09-09 |
EP1571235B1 (fr) | 2019-07-17 |
FR2867198B1 (fr) | 2007-09-14 |
EP1571235A3 (fr) | 2008-03-19 |
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