FR2508497A2 - Lead sheathed electrode for chromium plating - with non-conductive end=cap - Google Patents

Lead sheathed electrode for chromium plating - with non-conductive end=cap Download PDF

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Publication number
FR2508497A2
FR2508497A2 FR8113283A FR8113283A FR2508497A2 FR 2508497 A2 FR2508497 A2 FR 2508497A2 FR 8113283 A FR8113283 A FR 8113283A FR 8113283 A FR8113283 A FR 8113283A FR 2508497 A2 FR2508497 A2 FR 2508497A2
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France
Prior art keywords
cap
anode
sheath
rod
plug
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.)
Pending
Application number
FR8113283A
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French (fr)
Inventor
Lucien Jeantet
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.)
JEANTET
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JEANTET
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Filing date
Publication date
Priority claimed from FR7733332A external-priority patent/FR2407278A1/en
Application filed by JEANTET filed Critical JEANTET
Priority to FR8113283A priority Critical patent/FR2508497A2/en
Publication of FR2508497A2 publication Critical patent/FR2508497A2/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10Electrodes, e.g. composition, counter electrode
    • C25D17/12Shape or form

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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)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The bottom end of an electrode for chromium plating, comprising a lead sheath, through which a threaded rod of material of higher electrical conductivity is screwed, has a cap of non-conductive material. The cap may be internally threaded, and screwed onto the end of the central rod. Alternatively it may be hollow, and held in place by a nut screwed onto the rod, clamping the base of the cap against the end of the electrode body. The cap itself may have a screwed in removable cover, giving access to the nut, but protecting the protruding end of the threaded central rod. The non-conductive end cap prevents, in simple bar electrodes, swelling of the bottom end, due to structural changes in the lead sheath, caused by preferential action of the electric current. It also prevents stretching of the lead sheath over periods of 18 months or more in service.

Description

La présente addition concerne une amélioration à l'anode pour chromage électrolytique décrite au brevet principal. The present addition relates to an improvement to the anode for electrolytic chromium plating described in the main patent.

La demanderesse a découvert qutil. était possible de régulariser la répartition de l'intensité du courant dans l'anode en plomb allie, en introduisant dans cette dernière une ame en métal de meilleure conductibilité (fer, cuivre, aluminium...). On communique simultanément à l'anode une meilleure rigidité. The Applicant has discovered that it. was possible to regularize the distribution of the current intensity in the alloy lead anode, by introducing into the latter a metal core of better conductivity (iron, copper, aluminum ...). Better rigidity is communicated simultaneously to the anode.

La réalisation d'une telle anode imposait que soit réalisé un contact parfait entre l'âme en metal conducteur et la gaine de plomb. The realization of such an anode required that a perfect contact be made between the conductive metal core and the lead sheath.

Le brevet principal avait donc pour objet une anode pour chromage électrolytique constituée par une gaine en plomb allié dans laquelle est vissée en force une tige filetée d'un métal ayant une conductibilité supérieure à celle de la gaine, tel que le fer, le cuivre ou l'aluminium, le diamètre extérieur de cette tige étant supérieur à 1'alésage de la gaine, permettant ainsi un autotaraudage de ladite gaine de plomb par vissage en force de ladite tige filetée. The main patent therefore had for its object an anode for electrolytic chromium plating constituted by a sheath of alloyed lead into which is screwed in force a threaded rod of a metal having a conductivity higher than that of the sheath, such as iron, copper or aluminum, the external diameter of this rod being greater than the bore of the sheath, thus allowing self-tapping of said lead sheath by force screwing of said threaded rod.

a demanderesse a constaté que cette anode subissait dans le temps des modifications dans la structure métallique (plomb) située a sa partie inférieure dues à l'ac tion préférentielle du courant lectrique, notamment lors de l'électrolyse des solutions chromiques ; ces modifications peuvent donner lieu à l'apparition d'un gonflement à la partie inférieure de l'anode selon le phéno- mène couramment dénommé bouchon de champagne". The Applicant has found that this anode underwent modifications over time in the metallic structure (lead) situated at its lower part due to the preferential action of the electric current, in particular during the electrolysis of chromic solutions; these modifications can give rise to the appearance of a swelling at the lower part of the anode according to the phenomenon commonly known as champagne cork ".

Le brevet principal avait déjà propose de remédier à cet inconvénient en réalisant l'anode en forme de U. The main patent had already proposed to remedy this drawback by producing the U-shaped anode.

Lors de ses recherches, la demanderesse a maintenant decouvert que cet inconvénient pouvait être surmonte', dans le cas d'anodes en forme de barre si l'on équipait l'extrémité inférieure de ladite anode d'un bouchon en matière non conductrice. Seule reste ainsi soumise a' l'action du courant électrique la partie non protégée du corps cylindrique, ce qui permet d'éviter toute modification apparaissant à la partie inférieure de ladite anode (phénomène dit "bouchon de champagne") ainsi que d'empêcher l'allongement do plomb allié constituant le corps de l'anode que l'on constate habituellement apres lme longue période d'utilisation (18 mois ou plus).  During its research, the plaintiff has now discovered that this drawback could be overcome, in the case of bar-shaped anodes if one fitted the lower end of said anode with a plug of non-conductive material. Only the unprotected part of the cylindrical body remains thus subjected to the action of the electric current, which makes it possible to avoid any modification appearing at the lower part of said anode (phenomenon called "champagne cork") as well as to prevent the elongation of alloyed lead constituting the body of the anode which is usually observed after a long period of use (18 months or more).

C'est ainsi que l'addition a por objet une anode du type décrit au brevet principal, c'eqt-a-dire constituée par une gaine en plomb allié dans laquelle est vissee une tige filetée d'un métal dune conductibilité supérieure à celle de la gaine, le diamètre extérieur de cette tige étant supérieur à l'alésage de la gaine, permettant ainsi un autotaraudage de ladite gaine de plomb par vissage en force de ladite tige filetée, et dont l'originalité consiste en ce que ladite tige filetée traverse de part en part ladite gaine pour permettre 1a fixation d'un bouchon en matière non conductrice par l'intermédiaire d'un écrou grâce auquel le fond dudit bouchon est bridé entre le corps de l'anode et l'écrou précité. Thus, the addition has for object an anode of the type described in the main patent, that is to say constituted by a sheath of alloy lead in which is screwed a threaded rod of a metal with a conductivity higher than that of the sheath, the external diameter of this rod being greater than the bore of the sheath, thus allowing a self-tapping of said lead sheath by forcibly screwing said threaded rod, and whose originality consists in that said threaded rod crosses right through said sheath to allow the attachment of a plug of non-conductive material by means of a nut by means of which the bottom of said plug is clamped between the body of the anode and the aforementioned nut.

La présente invention sera d(aJlllerrrs mieux comprise et ses avantages ressortiront bien de la description qui suit en référence au dessin schématique annexe dont les figures 1 et 2 représentent deux modes de réalisation de l'anode selon la présente addition. The present invention will be d (aJlllerrrs better understood and its advantages will become apparent from the following description with reference to the accompanying schematic drawing, Figures 1 and 2 show two embodiments of the anode according to the present addition.

Cette anode 2 se compose, comme il est décrit au brevet principal d'une gaine 3 en plomb allié constituant le corps de l'anode, dans laquelle a été introduite, par vissage en force, une tige filetée 4 en métal de conductibilité supérieure à celle de la gaine, le diamètre de cette tige étant supérieur à l'alésage de la gaine. Un crochet de position, en fer ou en cuivre (non représenté) assure la fixation de l'anode 2 à la barre anodique d'amenée de courant. This anode 2 is composed, as described in the main patent, of a sheath 3 of alloy lead constituting the body of the anode, into which has been introduced, by force screwing, a threaded rod 4 of conductivity metal greater than that of the sheath, the diameter of this rod being greater than the bore of the sheath. A position hook, made of iron or copper (not shown), secures the anode 2 to the anode current supply bar.

Selon la présente addition, l'extrémité inférieure de cette anode 2 est équipée d'un bouchon 141 en matière non conductrice, telle que le chlorure de polyvinyl, le polyéthylène ou similaire.  According to the present addition, the lower end of this anode 2 is equipped with a plug 141 of non-conductive material, such as polyvinyl chloride, polyethylene or the like.

Dans le mode de réalisation représenté à la figure 1, la tige filetée 4 traverse de part en part la gaine 3 pour permettre la fixation du bouchon 14 par l'intermédiaire du taraudage prévu à cet effet. Ce taraudage est éventuellement protégé par un insert métallique et le blocage du bouchon sur la tige filetée garanti par apport d'une colle convenable. In the embodiment shown in Figure 1, the threaded rod 4 passes right through the sheath 3 to allow the fixing of the plug 14 through the thread provided for this purpose. This tapping is possibly protected by a metal insert and the blocking of the plug on the threaded rod guaranteed by the addition of a suitable adhesive.

Dans le mode de réalisation représenté à la figure 2, la tige filetée 4 traverse de part en part la gaine 3 pour permettre la fixation du bouchon 14 par l'intermédiaire de l'écrou 15 grace auquel le fond du bouchon 14 est bridé entre le corps de l'anode 2 et l'écrou 15. In the embodiment shown in FIG. 2, the threaded rod 4 passes right through the sheath 3 to allow the fixing of the plug 14 by means of the nut 15 by which the bottom of the plug 14 is clamped between the body of anode 2 and nut 15.

Dans ce mode de réalisation, le bouchon creux 14 est lui-même équipé d'un couvercle amovible 16 qui lui est fixé par vissage ou similaire rendant ainsi accessible l'écrou 15 tout en assurant une protection absolue de l'extrémité filetée de la tige 4 sortant de la partie inférieure de la gaine 3 constituant le corps de l'anode 2.  In this embodiment, the hollow plug 14 is itself equipped with a removable cover 16 which is fixed to it by screwing or the like, thus making the nut 15 accessible while ensuring absolute protection of the threaded end of the rod. 4 leaving the lower part of the sheath 3 constituting the body of the anode 2.

Ces modes de réalisation permettent de supprimer les phénomènes fréquemment constatés de modifications et notamment de gonflement de l'extrémité inférieure des anodes en forme de barre ainsi que l'allongement de la gaine en plomb au cours de longues périodes d'utilisation. L'usure de l'anode est régularisée sur toute la surface et l'on peut ainsi garantir, sur une longue période, la constance du rapport surface anodique/surface cathodique. These embodiments make it possible to eliminate the frequently observed phenomena of modifications and in particular swelling of the lower end of the bar-shaped anodes as well as the elongation of the lead sheath during long periods of use. The wear of the anode is regularized over the entire surface and it is thus possible to guarantee, over a long period, the consistency of the anode surface / cathode surface ratio.

Comme il va de soi et comme il ressort de ce qui précède, l'invention ne se limite pas aux seules formes d'exécution qui ont été décrites ci-dessus à titre d'exemple non limitatif ; elle en embrasse, au contraire, toutes les variantes de réalisation, quelles que soient notamment la forme et la structure du bouchon, la nature de la matière non conductrice le constituant.  As is obvious and as follows from the above, the invention is not limited to the sole embodiments which have been described above by way of nonlimiting example; on the contrary, it embraces all of the variant embodiments thereof, whatever the shape and structure of the stopper, the nature of the non-conductive material constituting it.

Claims (4)

- REVINDICATIONS  - CLAIMS i - Anode pour chromage électrolytique selon la revendication i du brevet principal, caractérisée en ce que son extrémité inférieure est munie d'un bouchon 14 en matière non conductrice. i - Anode for electroplating according to claim i of the main patent, characterized in that its lower end is provided with a plug 14 made of non-conductive material. 2 - Anode selon la revendication 1, caractérisée en ce que la tige filetée 4 en métal de conductibilité supérieure à celle de la gaine 2 traverse de part en part ladite gaine pour permettre la fixation du bouchon 14 en matière non conductrice, par l'intermédiaire du taraudage prévu à cet effet. 2 - Anode according to claim 1, characterized in that the threaded rod 4 of conductivity metal greater than that of the sheath 2 passes right through said sheath to allow the fixing of the plug 14 of non-conductive material, via tapping provided for this purpose. 3 - Anode selon la revendication 1, caractérisé en ce que la tige filetée en métal de conductibilité supé rieur à celle de la gaine 2 traverse de part en part ladite gaine pour permettre la fixation du bouchon 14 en Ma- tiers non conductrice par l'intermédiaire d'un écrou li gracie auquel le fond du bouchon 14 est bridé entre le corps de l'anode 2 et l'écrou 15.  3 - Anode according to claim 1, characterized in that the threaded metal rod of conductivity greater than that of the sheath 2 passes right through said sheath to allow the fixing of the plug 14 in non-conductive material by the through a loose nut to which the bottom of the plug 14 is clamped between the body of the anode 2 and the nut 15. 4 - Anode selon la revendication 3, caractérisée en ce que le bouchon 14 creux est lui-m8me équipé d'un couvercle amovible 16 qui lui est fixé par vissage ou similaire ren dant ainsi accessible l'écrou 15, tout en assurant une protection absolue de l'extrémité filetée de la tige 4 sortant de la partie inférieure de la gaine 2 constituant le corps de l'anode 2.  4 - Anode according to claim 3, characterized in that the hollow plug 14 is itself fitted with a removable cover 16 which is fixed to it by screwing or the like thus rendering the nut 15 accessible, while ensuring absolute protection from the threaded end of the rod 4 leaving the lower part of the sheath 2 constituting the body of the anode 2.
FR8113283A 1977-10-27 1981-06-30 Lead sheathed electrode for chromium plating - with non-conductive end=cap Pending FR2508497A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8113283A FR2508497A2 (en) 1977-10-27 1981-06-30 Lead sheathed electrode for chromium plating - with non-conductive end=cap

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7733332A FR2407278A1 (en) 1977-10-27 1977-10-27 Chromium plating anode - comprises lead alloy sheath into which is screw threaded metal of greater electrical conductivity
FR8113283A FR2508497A2 (en) 1977-10-27 1981-06-30 Lead sheathed electrode for chromium plating - with non-conductive end=cap

Publications (1)

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FR2508497A2 true FR2508497A2 (en) 1982-12-31

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619457A (en) * 1950-04-05 1952-11-25 Wagner Brothers Inc Electroplating anode
US3065153A (en) * 1958-10-15 1962-11-20 Gen Motors Corp Electroplating method and apparatus
US3726781A (en) * 1971-03-04 1973-04-10 P Verneuil Highly conductive adjustable electrodes
FR2407278A1 (en) * 1977-10-27 1979-05-25 Jeantet Chromium plating anode - comprises lead alloy sheath into which is screw threaded metal of greater electrical conductivity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619457A (en) * 1950-04-05 1952-11-25 Wagner Brothers Inc Electroplating anode
US3065153A (en) * 1958-10-15 1962-11-20 Gen Motors Corp Electroplating method and apparatus
US3726781A (en) * 1971-03-04 1973-04-10 P Verneuil Highly conductive adjustable electrodes
FR2407278A1 (en) * 1977-10-27 1979-05-25 Jeantet Chromium plating anode - comprises lead alloy sheath into which is screw threaded metal of greater electrical conductivity

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