FR2479055A1 - Powdered brazing flux contg. metal salt and acrylic! resin - applied by electrostatic powder coating - Google Patents

Powdered brazing flux contg. metal salt and acrylic! resin - applied by electrostatic powder coating Download PDF

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Publication number
FR2479055A1
FR2479055A1 FR8006922A FR8006922A FR2479055A1 FR 2479055 A1 FR2479055 A1 FR 2479055A1 FR 8006922 A FR8006922 A FR 8006922A FR 8006922 A FR8006922 A FR 8006922A FR 2479055 A1 FR2479055 A1 FR 2479055A1
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FR
France
Prior art keywords
electrostatic
resin
borax
boric acid
powder
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
Application number
FR8006922A
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French (fr)
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FR2479055B1 (en
Inventor
Michel Dauvergne
Gilbert Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lincoln Electric Co France SA
Original Assignee
La Soudure Autogene Francaise
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by La Soudure Autogene Francaise filed Critical La Soudure Autogene Francaise
Priority to FR8006922A priority Critical patent/FR2479055A1/en
Publication of FR2479055A1 publication Critical patent/FR2479055A1/en
Application granted granted Critical
Publication of FR2479055B1 publication Critical patent/FR2479055B1/fr
Granted legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B23K1/203—Fluxing, i.e. applying flux onto surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3606—Borates or B-oxides

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Paints Or Removers (AREA)

Abstract

Metal components are coated prior to assembly by brazing with a mixt. of (a) a powdered mineral salt flux capable of dissolving metal oxides and (b) a powdered acrylic resin. The powder is applied by electrostatic powder coating techniques. Pref. acrylic resin is a poly alkyl(meth)acrylate, and esp. polybutylmethacrylate. Pref. flux compsn. comprises 75 % boric acid, 20 % borax and 5 % polybutylmethacrylate; or 71 % boric acid, 18 % borax and 11 % polybutyl methacrylate. The powders are applied e.g. by electrostatic unit or by electrostatic gun fed by compressed air. The flux compsn. has good adhesion to the metal and gives improved brazed joints.

Description

La présente invention concerne un procédé de revêtement de pièces métalliques préalablement à leur assemblage par brasage, au moyen d'un flux comportant un sel minéral capable de dissoudre les oxydes métalliques et se présentant sous forme pulvérulente, par exemple un halogénure métallique ou un composé oxygéné du bore. The present invention relates to a method of coating metal parts prior to their assembly by brazing, by means of a flux comprising an inorganic salt capable of dissolving metal oxides and being in pulverulent form, for example a metal halide or an oxygenated compound boron.

La technique d'assemblage par brasage fait appel à des flux décapants dont le rôle est de dissoudre les oxydes formés en surface des pièces à assembler et permettre ainsi la bonne réalisation du joint a braser. The assembly by brazing technique uses flux strippers whose role is to dissolve the oxides formed on the surface of the parts to be assembled and thus allow the good realization of the solder joint.

Divers procédés de revêtement de pièces au moyen d'un flux, ou procédés de fluxage 9 sont actuellement connus. Various methods of coating parts by means of a flux, or fluxing methods 9 are currently known.

Parm'- ces procédés, on connaît ceux qui utilisent une composition décapante telle que celle connue par la demande de brevet français n 78.16.185, se présentant sous forme d'une pâte ou d'une barbotine permettant le revêtement des pièces soit par enduction, soit par pulvérisation au moyen d'une bombe aerosol, soit encore par immersion. L'utilisation de ces pâtes ou barbotines présente de nombreux inconvénients :elles se dégradent rapidement, créent une pollution importante et elles obligent à un nettoyage fréquent du matériel. These processes include those which use a stripping composition such as that known from French patent application no. 78.16.185, in the form of a paste or a slip allowing the parts to be coated either by coating , either by spraying with an aerosol can, or by immersion. The use of these pastes or slurries has many drawbacks: they degrade quickly, create significant pollution and they require frequent cleaning of the equipment.

On connaît par ailleurs les techniques de poudrage électrostatique qui sont utilisées pour l'enrobage de certains objets par une couche de matière plastique. Mais les sels minéraux actifs habituellement utilisés dans les flux ont des propriétés diélectriques incompatibles avec la technique du poudrage électro-statique. De plus, les rendements obtenus avec ces techniques, ctest-à-dire le rapport du poids de poudre utilisé au poids de poudre déposé, est très faible et l'adhérence de cette poudre est extrêment médiocre. Furthermore, electrostatic powdering techniques are known which are used for coating certain objects with a layer of plastic material. However, the active mineral salts usually used in fluxes have dielectric properties which are incompatible with the electrostatic powdering technique. In addition, the yields obtained with these techniques, that is to say the ratio of the weight of powder used to the weight of powder deposited, is very low and the adhesion of this powder is extremely poor.

L'invention a pour but de permettre un revetement présentant une adhérence satisfaisante sur les pièces à braser, pouvant être réalisé avec un bon rendement et évitant les incon venients inhérents aux pâtes ou barbotines, et elle propose dans ce but un procédé qui consiste à mélanger, au sel minéral pulvérulent précité, une résine acrylique se présentant également sous forme pulvérulente et à appliquer le mélange obtenu sur les pièces à braser par poudrage électro-statique. The object of the invention is to allow a coating having satisfactory adhesion to the parts to be brazed, which can be produced with good yield and avoiding the disadvantages inherent in doughs or slurries, and it proposes for this purpose a method which consists in mixing , with the aforementioned powdery mineral salt, an acrylic resin also in powder form and applying the mixture obtained to the parts to be brazed by electrostatic powdering.

L'invention permet donc de réaliser un fluxage à sec des pièces à braser. The invention therefore makes it possible to carry out dry fluxing of the parts to be brazed.

La résine acrylique est utilisée, dans la présente invention, en raison de ses propriétés diélectriques qui la rendent aptes au poudrage électro-statique et en raison de sa compatibilité avec les impératifs du brasage. The acrylic resin is used, in the present invention, because of its dielectric properties which make it suitable for electrostatic powdering and because of its compatibility with the requirements of soldering.

Selon une autre caractéristique de 1' invention, la résine précitée est constituée par un métacrylate ou un polymétacrylate d'alkyle. According to another characteristic of the invention, the aforementioned resin consists of a methacrylate or an alkyl polymethacrylate.

Ces résines permettent d'obtenir des rendements élevés et une très bonne adhérence sur les pièces à braser. These resins provide high yields and very good adhesion to the parts to be brazed.

Selon une autre caractéristique de l'invention, le poudrage est réalisé par projection du mélange pulvérulent au moyen d'un pistolet électro-statique à alimentation à air comprimé. According to another characteristic of the invention, the dusting is carried out by spraying the pulverulent mixture by means of an electro-static gun with compressed air supply.

Différentes compositions pulvérulentes ont été utilisées dans lesquelles les sels minéraux sont constitués par les composés oxygénés du bore tel que l'acide borique et/ou un borate et dans lesquelles les résines acryliques sont constituées par un polymétacrylate tel que le polymétacrylate de butyle. Various pulverulent compositions have been used in which the mineral salts consist of oxygenated boron compounds such as boric acid and / or a borate and in which the acrylic resins consist of a polymetacrylate such as polymethyl butyl acrylate.

On donnera ci-après deux exemples spécifiques de flux pulvérulents utilisés pour la mise en oeuvre du procédé selon l'invention
EXEMPLE 1
Les sels minéraux ou éléments actifs utilisés sont l'acide borique et le pyroborate de sodium (borax) et la résine acrylique est un polymétacrylate de butyle dans les proportions suivantes en poids
- acide borique 75 %
- borax 20 %
- polymétacrylate de butyle 5 %
EXEMPLE 2
Les sels minéraux et la résine sont les mêmes que dans 11 exemple 1 mais avec les proportions suivantes
- acide borique 71 %
- borax 18 %
- polymétacrylate de butyle 11 ss
Ce dernier flux est utilisable plus particulièrement pour des pièces compliquées comportant par exemple des gorges profondes ou des joints et nécessitant un flux à forte pénétration.Two specific examples of pulverulent flows used for implementing the method according to the invention will be given below.
EXAMPLE 1
The mineral salts or active elements used are boric acid and sodium pyroborate (borax) and the acrylic resin is a butyl polymethacrylate in the following proportions by weight
- 75% boric acid
- borax 20%
- 5% polymethyl butylacrylate
EXAMPLE 2
The mineral salts and the resin are the same as in Example 1 but with the following proportions
- boric acid 71%
- borax 18%
- 11 ss polymethyl butyl acrylate
This latter flow can be used more particularly for complicated parts comprising for example deep grooves or seals and requiring a flow with high penetration.

Ces flux peuvent être appliqués soit à l'aide d'un pistolet électrostatique de type classique dans lequel la poudre entraînée au moyen d'air comprimé passe sur une électrode portée à tension élevée (de l'ordre de 80.000 volts) ou à l'aide d'installations industrielles entièrement statiques, telles que celles connues sous l'appelation commerciale "BRENNLAGE" qui comportent un bac muni d'électrodes pour charger électriquement la poudre, cette dernière étant attirée par effet électrostatique sur les pièces à recouvrir. These fluxes can be applied either using a conventional type electrostatic gun in which the powder entrained by means of compressed air passes over an electrode brought to high voltage (of the order of 80,000 volts) or to the using entirely static industrial installations, such as those known under the trade name "BRENNLAGE" which comprise a container provided with electrodes for electrically charging the powder, the latter being attracted by electrostatic effect on the parts to be covered.

L'invention s'applique, d'une façon générale, au fluxage des pièces à braser, c'est-à-dire à leur recouvrement au moyen d'un flux décapant et plus particulièrement au fluxage de pièces devant subir un oxybrasage au moyen d'installations automatiques, ces pièces pouvant être constituées par des métaux ferreux ou cuivreux ou encore par des alliages d'aluminium. The invention applies, in general, to the fluxing of the parts to be brazed, that is to say to their covering by means of a flux flux and more particularly to the fluxing of parts having to undergo an oxybrasing by means automatic installations, these parts can be made of ferrous or copper metals or aluminum alloys.

On peut apporter au procédé décrit de nombreuses variantes sans pour autant sortir du cadre de l'invention, c'est ainsi que l'on peut par exemple utiliser comme sels minéraux des chlorures ou fluorures d'aluminium, ceci dans le cas de brasage ou d'oxybrasage d'alliage à base de cuivre ou d'aluminium.  Numerous variants can be brought to the process described without departing from the scope of the invention, this is how it is possible, for example, to use aluminum chlorides or fluorides as inorganic salts, this in the case of brazing or of oxy-brazing of alloy based on copper or aluminum.

Claims (7)

REVENDICATIONS 1. - Procédé de revêtement de pièces métalliques préalablement à leur assemblage par brasage au moyen d'un flux comportant un sel minéral capable de dissoudre les oxydes métalliques et se présentant sous forme pulvérulente caractérisé en ce qu'il consiste à mélanger audit sel minéral une résine acrylique se présentant également sous forme pulvérulente et à appliquer le mélange obtenu sur les pièces précitées par poudrage électro-statique. 1. - Method of coating metal parts prior to their assembly by brazing by means of a flux comprising an inorganic salt capable of dissolving the metal oxides and being in powder form characterized in that it consists in mixing with said inorganic salt acrylic resin also in powder form and to apply the mixture obtained on the aforementioned parts by electrostatic powdering. 2. - Procédé selon la revendication 1, caractérisé en ce que la résine précitée est constituée par un métacrylate ou un polymétacrylate d'alkyle. 2. - Method according to claim 1, characterized in that the aforementioned resin consists of a metacrylate or an alkyl polymetacrylate. 3. - Procédé selon la revendication 2, caractérisé en ce que la résine est constituée par un polymétacrylate de butyle. 3. - Method according to claim 2, characterized in that the resin consists of a butyl polymethacrylate. 4. - Procédé selon la revendication 1, caractérisé en ce que le mélange précité comporte des constituants suivants avec les proportions suivantes 4. - Method according to claim 1, characterized in that the above mixture comprises the following constituents with the following proportions - acide borique 75 % - 75% boric acid - borax 20 % - borax 20% - polymétacrylate de butyle 5 % - 5% polymethyl butylacrylate 5. - Procédé selon la revendication 1, caractérisé en ce que le mélange précité comporte les constituants suivants avec les proportions suivantes 5. - Method according to claim 1, characterized in that the above mixture comprises the following constituents with the following proportions - acide borique 71 % - boric acid 71% - borax 18 % - borax 18% - polymétacrylate de butyle 11 % - 11% polymethyl butyl acrylate 6. - Procédé selon la revendication 1, caractérisé en ce que le poudrage est réalisé par projection du mélange pulvérulent au moyen d'un pistolet électro-statique alimenté par air comprimé. 6. - Method according to claim 1, characterized in that the powdering is carried out by spraying the powder mixture by means of an electro-static gun supplied with compressed air. 7. - Procédé selon la revendication 1, caractérisé en ce que le poudrage est réalisé par application du mélange pulvérulent au moyen d'une installation électrostatique.  7. - Method according to claim 1, characterized in that the dusting is carried out by application of the powder mixture by means of an electrostatic installation.
FR8006922A 1980-03-28 1980-03-28 Powdered brazing flux contg. metal salt and acrylic! resin - applied by electrostatic powder coating Granted FR2479055A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8006922A FR2479055A1 (en) 1980-03-28 1980-03-28 Powdered brazing flux contg. metal salt and acrylic! resin - applied by electrostatic powder coating

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Application Number Priority Date Filing Date Title
FR8006922A FR2479055A1 (en) 1980-03-28 1980-03-28 Powdered brazing flux contg. metal salt and acrylic! resin - applied by electrostatic powder coating

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FR2479055A1 true FR2479055A1 (en) 1981-10-02
FR2479055B1 FR2479055B1 (en) 1984-10-05

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075722A1 (en) * 1981-09-30 1983-04-06 Westinghouse Electric Corporation Sleeve preparation method
FR2546785A1 (en) * 1983-06-02 1984-12-07 Simon Van Keirsbilck Brazing of cast iron onto steel
WO1996013353A1 (en) * 1994-10-28 1996-05-09 Jorma Kivilahti A method for joining metals by soldering
EP0931619A1 (en) * 1998-01-26 1999-07-28 Delphi Technologies, Inc. Method for braze flux application
WO2000038874A1 (en) * 1998-12-23 2000-07-06 Erbslöh Ag Method for partially or completely coating the surfaces of components produced from aluminum or its alloys with solders, fluxing agents or binders for brazing
US6193139B1 (en) * 1996-10-17 2001-02-27 Jorma Kivilahti Method for joining metals by soldering
DE19907294C5 (en) * 1998-02-24 2013-08-22 Denso Corporation Aluminum extruded multi-cavity flat tube with excellent brazing properties for use in automotive heat exchangers and manufacturing processes therefor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897106A (en) * 1955-07-19 1959-07-28 Union Carbide Corp Moisture resistant brazing rod
US3033713A (en) * 1960-04-20 1962-05-08 Air Reduction Improved-stabilized brazing fluxes and binders
US3409478A (en) * 1965-09-22 1968-11-05 Allied Chem Aerosol brazing flux and method of brazing therewith
FR2036157A5 (en) * 1969-03-05 1970-12-24 Chausson Usines Sa Flexing and brazing aluminium workpieces - for automobile radiators
FR2193676A1 (en) * 1972-07-26 1974-02-22 Castolin Soldering/brazing material -contg a polymethacrylate as binder
FR2355086A1 (en) * 1976-06-14 1978-01-13 Caterpillar Tractor Co PROCESS FOR APPLYING A PRECURSOR COMPOSITION TO A FERROUS WORKPIECE
FR2427164A1 (en) * 1978-05-31 1979-12-28 Soudure Autogene Francaise Rapid drying flux compsn. for brazing metals - comprises inorganic salt e.g. halide or boron cpd., low boiling solvent and organic binder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897106A (en) * 1955-07-19 1959-07-28 Union Carbide Corp Moisture resistant brazing rod
US3033713A (en) * 1960-04-20 1962-05-08 Air Reduction Improved-stabilized brazing fluxes and binders
US3409478A (en) * 1965-09-22 1968-11-05 Allied Chem Aerosol brazing flux and method of brazing therewith
FR2036157A5 (en) * 1969-03-05 1970-12-24 Chausson Usines Sa Flexing and brazing aluminium workpieces - for automobile radiators
FR2193676A1 (en) * 1972-07-26 1974-02-22 Castolin Soldering/brazing material -contg a polymethacrylate as binder
FR2355086A1 (en) * 1976-06-14 1978-01-13 Caterpillar Tractor Co PROCESS FOR APPLYING A PRECURSOR COMPOSITION TO A FERROUS WORKPIECE
FR2427164A1 (en) * 1978-05-31 1979-12-28 Soudure Autogene Francaise Rapid drying flux compsn. for brazing metals - comprises inorganic salt e.g. halide or boron cpd., low boiling solvent and organic binder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0075722A1 (en) * 1981-09-30 1983-04-06 Westinghouse Electric Corporation Sleeve preparation method
US4448343A (en) * 1981-09-30 1984-05-15 Westinghouse Electric Corp. Sleeve preparation method
FR2546785A1 (en) * 1983-06-02 1984-12-07 Simon Van Keirsbilck Brazing of cast iron onto steel
WO1996013353A1 (en) * 1994-10-28 1996-05-09 Jorma Kivilahti A method for joining metals by soldering
US6015082A (en) * 1994-10-28 2000-01-18 Kivilahti; Jorma Method for joining metals by soldering
US6193139B1 (en) * 1996-10-17 2001-02-27 Jorma Kivilahti Method for joining metals by soldering
EP0931619A1 (en) * 1998-01-26 1999-07-28 Delphi Technologies, Inc. Method for braze flux application
DE19907294C5 (en) * 1998-02-24 2013-08-22 Denso Corporation Aluminum extruded multi-cavity flat tube with excellent brazing properties for use in automotive heat exchangers and manufacturing processes therefor
WO2000038874A1 (en) * 1998-12-23 2000-07-06 Erbslöh Ag Method for partially or completely coating the surfaces of components produced from aluminum or its alloys with solders, fluxing agents or binders for brazing
US6648214B1 (en) 1998-12-23 2003-11-18 Erbslöh Ag Method for partially or completely coating the surfaces of components produced from aluminum or its alloys with solders, fluxing agents or binders for brazing

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