EP3117028A1 - Installation et procédé de traitement d'anodisation de produits faits en aluminium ou alliages de ce dernier - Google Patents

Installation et procédé de traitement d'anodisation de produits faits en aluminium ou alliages de ce dernier

Info

Publication number
EP3117028A1
EP3117028A1 EP15718575.2A EP15718575A EP3117028A1 EP 3117028 A1 EP3117028 A1 EP 3117028A1 EP 15718575 A EP15718575 A EP 15718575A EP 3117028 A1 EP3117028 A1 EP 3117028A1
Authority
EP
European Patent Office
Prior art keywords
products
pipes
electrolyte solution
treatment
aluminium
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
EP15718575.2A
Other languages
German (de)
English (en)
Other versions
EP3117028B1 (fr
Inventor
Carlo Calcaterra
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.)
Qualital Servizi Srl
Original Assignee
Qualital Servizi Srl
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 Qualital Servizi Srl filed Critical Qualital Servizi Srl
Publication of EP3117028A1 publication Critical patent/EP3117028A1/fr
Application granted granted Critical
Publication of EP3117028B1 publication Critical patent/EP3117028B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • 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
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/10—Agitating of electrolytes; Moving of racks

Definitions

  • the present invention relates to a plant and a process for the anodizing treatment of products made of aluminium or alloys thereof and, particularly, a plant and a process designed for the treatment of profiled sections made of such materials.
  • aluminium is a silvery metal having the unique feature of turning its surface into a thin layer of natural aluminium oxide which is hard, compact, and practically inert to atmospheric agents.
  • electrochemical processes are referred to as "anodizing” processes because the material (aluminium) is connected to the anode (positive pole) of a suitable electrochemical system comprising a direct current generator.
  • the thickness of aluminium oxide is expressed in microns (symbol ⁇ ), i.e. thousandths of a millimetre.
  • layer thickness is of great importance because it is a key factor controlling its corrosion resistance and its behaviour in the external environment.
  • the choice of the thickness should be agreed with the user and it depends on the degree of aggressiveness of the environment in which the material is to be placed, the final appearance of the surfaces and the final size of the finished object.
  • thicknesses of Classes 15 and 20 are generally used for external architectural applications. In the United Kingdom, as well as in some other countries of Northern Europe, thicknesses of Class 25 may be required, especially where industrial pollution is high or when used in industrial marine environments.
  • the anodizing treatment of aluminium is generally carried out by dipping the products to be anodized into a tank containing an electrolyte solution, for example a solution of sulphuric acid (H 2 S0 4 ).
  • an electrolyte solution for example a solution of sulphuric acid (H 2 S0 4 ).
  • the products are then connected to the positive pole (anode), whereas the negative pole (cathode) consisting of a lead or aluminium electrode, is dipped into the electrolyte solution contained in the tank.
  • the quality and properties of the anodic oxide as obtained by these known types of processes depend on the characteristics of aluminium and alloys thereof, but especially on conditions and treatment variables which may influence the characteristics of the final product, namely:
  • the current density i.e. the current strength per unit surface
  • the choice of current density to be used depends on certain factors, such as the maximum power of the current rectifier with respect to the amount of material to be treated and the cooling capacity of the bath into which the products are dipped.
  • s is the thickness of the oxide as expressed in microns
  • d is the current density, expressed in A/dm 2 ;
  • t is the treatment time, expressed in minutes
  • k is a proportionality factor dependent on the type of alloy subjected to treatment.
  • the above mentioned empirical formula can be used to determine treatment times as a function of the various thicknesses desired to be obtained. For example, when factor k is set to a value of 0.3, the following Table 2 shows the treatment times and the average thicknesses obtained.
  • the supports can be made, for example, of an aluminium alloy or otherwise of a material having characteristics of high electrical conductivity, good workability, light weight and affinity for the material to be anodized.
  • the shapes of the supports depend on the type of products to be treated. For example, they can be rectangular, square, circular, pentagonal in cross-section or rack-shaped, or the like. In any case, the main features of the supports should be a good compromise among the following requirements:
  • One of the main drawbacks of this approach is that, when the profiled sections are in a hung condition, they can easily swing within the treatment area and directly contact the cathodes, resulting in a short circuit. Under normal conditions, the circuit between the anode and the cathode is closed by the jets themselves of the electrolyte solution, which forms the load resistance of the circuit. The currents passing between the anode and the cathode are very high and, therefore, the direct contact between the anode and the cathode turns-on the protection systems of the generator, thereby blocking the production cycle or, in the worst case, potentially damaging the direct current generator.
  • the pump used to pressurize the electrolyte solution should be very powerful in order to ensure the thrust required to supply the electrolyte solution under an appropriate pressure up to the highest spraying means.
  • the task of the present invention is to provide a plant and a process for the continuous anodizing treatment of products made of aluminium or alloys thereof, which allow the drawbacks of the prior art to be solved.
  • an object of the present invention is to provide a plant of the type mentioned above in which the short circuit between the anode and the cathode is prevented from occurring.
  • Another object of the present invention is to provide a plant of the type mentioned above which can treat profiled sections of any length by effectively delivering the current along the entire length of the profiled sections.
  • a further object of the present invention is to provide a plant of the type mentioned above which can reduce the amount of power used by the pump for spraying the products, and particularly the profiled sections, with jets of an electrolyte solution.
  • Another object of the present invention is to provide a plant of the type mentioned above which can even treat profiled sections having a complex cross-profiled section.
  • Still another object of the present invention is to provide a plant and a process which can be easily integrated with other processes and plants for the continuous treatment of products made of aluminium or alloys thereof.
  • a plant for the continuous anodizing treatment of products made of aluminium or alloys thereof comprises means for feeding the products along a treatment path, at least one tank for collecting and/or storing a liquid electrolyte solution, a plurality of pipes for supplying jets of the liquid electrolyte solution towards the products along the treatment path, a plurality of conduits for hydraulically connecting the tank to the pipes, and at least one pump for feeding the electrolyte solution under pressure to the pipes.
  • the plant comprises cathode electrodes arranged in electric contact with the liquid electrolyte solution, and anode electrodes arranged in electric contact with the products.
  • At least the pipes supplying the jets of electrolyte solution are made of an electrically insulating material. This helps to prevent dangerous short circuits from occurring between the anode and the cathode while the products are moved through the treatment area. Practically, the electric circuit is closed only and exclusively by means of the "liquid contact" of the jets connected to the cathode, so as to ensure the load resistance required in the circuit while preventing that any swinging movement of the products connected to the anode may bring them into direct contact with the cathode.
  • the pipes supplying the electrolyte solution are arranged on dispensing devices to which the electrolyte solution is fed under pressure.
  • At least one cathode electrode is advantageously housed in each of the dispensing devices.
  • the resistance of the electrolyte solution is not significantly altered compared to that of the solutions of the known type.
  • the cathode is positioned very close to the jets, and any change in the distance between the ends of the jets and the products passing through the treatment area will result in negligible changes in resistance.
  • an electrically insulating material which has proved to be suitable for the manufacture of the pipes is, for example, PVC.
  • the dispensing devices in which the cathodes are housed, as well as the collection and/or storage tank for the electrolyte solution and the relevant pipings hydraulically connecting all the components of the hydraulic circuit may also be advantageously made of the same material.
  • the material employed for these purposes allows the costs of the plant to be reduced and the maintenance of the cathode electrodes, which are made of aluminium or lead, to be carried out independently from that of the dispensing devices made of PVC.
  • the pipes open onto opposite sides along the treatment path so that the entire surface of the products, particularly that of the profiled sections made of aluminium or alloys thereof, can be sprayed with the jets.
  • the pipes can also be equipped with nozzles, also made of an electrically insulating material, at their ends.
  • the nozzles may be adjustable to allow even the treatment of products in the form of profiled sections having a particularly complex cross-section. This allows the nozzles to be appropriately oriented in such a way as to direct their jets towards areas which are difficult to be effectively reached with a horizontal jet.
  • the products While the products are moved along the treatment path, they are supported by appropriate supporting means which comprise the anode electrodes adapted to connect said products to the positive pole of a direct current generator.
  • the anode electrodes may constitute a portion of the supporting means.
  • the supporting means support the profiled sections preferably by keeping them with their prevailing dimension parallel to the feeding direction along the treatment path, i.e. in a horizontal position.
  • the supporting means support the profiled sections in at least two points in order to ensure the passage therethrough of high currents which can either facilitate the formation of an oxide layer of increased thickness for the same treatment time or, alternatively, reduce the treatment times for the same thickness of the oxide layer.
  • the profiled sections can also be fed while keeping them with their prevailing dimension perpendicular to the feeding direction along the treatment path, i.e. in a vertical position, and with the use of a single supporting means to electrically connect the profiled sections.
  • the invention also relates to a process for the continuous anodizing treatment of products made of aluminium or alloys thereof.
  • the process comprises the steps of:
  • the process according to the invention envisages that the jets of liquid electrolyte solution directed towards the products along the treatment path are supplied by pipes made of an electrically insulating material.
  • the electrolyte solution is fed under pressure to dispensing devices in each of which at least one cathode electrode is housed.
  • the jets of electrolyte solution under pressure are supplied by pipes opening onto opposite sides along the treatment path.
  • the jets directed towards the products can be supplied through nozzles arranged at the ends of the pipes.
  • the nozzles are also made of an electrically insulating material, and they can be of an adjustable type so as to appropriately direct the jets depending on the geometry of the profiled section.
  • the products While the products are moved along the treatment path, they are supported by appropriate supporting means which comprise the anode electrodes.
  • the products are profiled sections, i.e. products having a prevailing dimension with respect to the other two
  • the profiled sections are fed along the treatment path while keeping them hung up in at least two points with their prevailing dimension parallel to the feeding direction, i.e. in a horizontal position.
  • the profiled sections can be fed along the treatment path while keeping them hung up in at least one point with their prevailing dimension perpendicular to the feeding direction, i.e. in a vertical position.
  • the products can also be moved with a reciprocating motion along directions perpendicular to the axes of the pipes supplying the jets.
  • the products can be lowered and raised while they are moved through the treatment area, or they can be horizontally moved forward and backward to maintain them within the treatment area for all the time required to form the desired oxide layer.
  • FIG. 1 is a cross-sectional view, taken along a plane perpendicular to the feeding direction of the products, of a portion of a treatment plant according to a possible embodiment of the present invention
  • FIG. 2 is a longitudinal sectional view, taken along a plane parallel to the feeding direction of the products, of a treatment plant according to a possible embodiment of the present invention
  • FIG. 3 is a longitudinal sectional view of a detail of the plant according to a possible embodiment of the present invention.
  • FIG. 4 A and 4B illustrate the thicknesses of the anodic oxide as obtained from a test of a first profiled section sample with a flat shape
  • FIG. 5A and 5B illustrate the thicknesses of the anodic oxide as obtained from another test of a second profiled section sample with a flat shape
  • FIG. 6A and 6B illustrate the thicknesses of the anodic oxide as obtained from another test of a third profiled section sample with a flat shape
  • FIG. 7 A and 7B illustrate the thicknesses of the anodic oxide as obtained from another test of a fourth profiled section sample with a flat shape
  • FIGS. 8A and 8B illustrate the thicknesses of the anodic oxide as obtained from another test of a fifth profiled section sample with a flat shape
  • FIG. 9 schematically shows a treatment plant such as that of Figure 1 , which has been used to test a length of a door-and-window frame profiled section with a complex geometry;
  • FIG. 10 shows the cross-section of the door-and-window frame profiled section subjected to treatment in the plant of Figure 9;
  • FIG. 11 schematically shows a plant such as that of Figure 1, which has been used to obtain the results for a pair of samples of extruded plates made of aluminium alloy EN AW 6060 which were simultaneously subjected to anodizing treatment.
  • FIG. 1 a portion of a treatment plant 100 according to a possible embodiment of the present invention is schematically illustrated.
  • the plant 100 comprises a containing body 101 having arranged therein two dispensing devices 9 to dispense an electrolyte solution, for example constituted by a sulphuric acid solution, which is fed from an inlet 4 through pipings 8 made of an electrically insulating material, such as PVC or the like.
  • the dispensing devices 9 face the two sides of an aluminium plate sample 2 to be subjected to the anodizing treatment.
  • the dispensing devices 9 have arranged thereon pipes 3 made of PVC or a similar electrically insulating material, which supply jets of the electrolyte solution towards the sample 2 while it is being moved through the treatment area.
  • the pipings 8 are connected to a collection reservoir 7 for collecting the electrolyte solution, which is fed by means of a circulation pump 6 from a storage/collection tank 5 for storing/collecting sulphuric acid 5.
  • the pump 6 feeds the electrolyte solution under pressure to the collection reservoir 7 and then again to the dispensing devices 9 through a hydraulic circuit comprising the conduits 8 and the inlets 4 of the devices 9.
  • the piping 8 is outlined by a dashed line and connects the opposite side of the dispensing devices 9 (not visible here) facing those shown.
  • the profiled sections 20 are fed in a horizontal position, i.e. with their major dimension (length) parallel to the feeding direction, as indicated by the arrows A, along the treatment path.
  • the profiled sections 20 are supported by at least two supporting means 40: as is known these can be, for example, grippers or else the so-called "hangers", i.e. filaments of aluminium or the like which are wrapped around the profiled sections to establish an electric contact between the profiled sections 20 and the positive pole 120 through the anodic bar 45.
  • the anodic bar 45 which is shaped as a track or a rail, for example, wheels or sliding contact pads 42 coupled to conductors 43 electrically connecting the supporting means 40 to the anodic bar 45, are moved along direction A.
  • the negative pole 110 is electrically connected to the cathodes 1 housed in each of the dispensing devices 9.
  • the poles 110 and 120 are connected to a direct current generator (not shown) which can supply the currents required to perform the treatment.
  • profiled sections 20 While the profiled sections 20 are moved along the treatment path, they can also be moved with a reciprocating motion along directions perpendicular to the axes of the pipes 3 supplying the jets of electrolyte solution. These movements, schematically referred to by double arrows M in Figure 2, are independent from the feeding movement and can be useful for increasing the spreading of the electrolyte solution on the profiled sections 20 as well as for complying with the residence times of the profiled sections 20 along the feeding path as a function of the oxide thickness to be obtained.
  • anodizing can also be used as one of the possible treatment techniques preceding a subsequent painting process and as an alternative to other conventionally used processes which are based on chromium or titanates, zirconates, silanes, etc.
  • a plant 100 according to the present invention which operates in a continuous manner, can be advantageously integrated into a plant for the continuous painting of profiled sections made of aluminium and alloys thereof.
  • the process according to the present invention also allows for easily meeting the treatment requirements necessary for subjecting the profiled sections made of aluminium and alloys thereof to a subsequent painting step.
  • anodizing as well as other treatments which will be defined by the generic term "chemical conversion” in the following, allow the formation of a layer which is protective against possible corrosive phenomena as well as suitable to allow the final layer of paint to be adhered thereto.
  • anodizing represents an actual surface finishing process by which oxide layer thicknesses of 15, 20, 25 microns can be achieved.
  • Anodizing, as pre-treatment for painting, envisages layers of anodic oxide even more reduced in thickness, for example having a thickness in the range from 3 to 5 microns.
  • Anodizing treatments intended to reach thicknesses much higher than those indicated above, for example thicknesses even in excess of 50 microns, are also widespread; in this case, they are referred to as the so-called "hard” anodizing or "hard-coat”.
  • results of the tests carried out according to the present invention confirmed the soundness of the process and allowed evaluating the efficiency of the dispensing device 9 of electrolyte solution with the metal cathode 1 housed therein, in making the electric resistance of the jet independent from the cathode/anode distance, resulting in undoubted advantages especially from the point of view of safety (no risk of cathode/anode contacts and consequent short circuits) and plant simplicity.
  • the samples used for the tests were samples made of aluminium alloy EN AW 6060 with a chemical composition according to the requirements of standard EN 573-3.
  • the hooks used for supporting the test samples as well as the hidden faces of the test samples were suitably coated with a special resin which cannot be altered by the contact with the acidic solution of the electrolyte.
  • the system was constituted by two identical dispensing devices 9 opposing each other and equidistant from the anode, in this case constituted by the aluminium sample 2 to be anodized, as schematically shown in Figure 1.
  • Test No. 2 in terms of thickness of the anodic oxide as expressed in microns, are shown in Figures 4A and 4B with the values recorded in the areas highlighted by a circle.
  • the thicknesses obtained for the anodic oxide varied, for example with thicknesses in the range from 5.8 to 12.3 ⁇ on one face (Fig. 4A) and thicknesses in the range from 6.9 to 11.2 ⁇ on the other face (Fig. 4B).
  • Test No. 4 The process parameters for Test No. 4 were as follows:
  • test sample 22 ( Figures 6 A and 6B) was subjected to an anodizing cycle in which voltage and current were varied as shown in Table 4 below.
  • Test No. 5 in terms of thickness of the anodic oxide as expressed in microns, are shown in Figures 6A and 6B with the values recorded in the areas highlighted by a circle.
  • the thicknesses obtained for the anodic oxide varied, for example with thicknesses in the range from 8.7 to 19.2 ⁇ on one face (Fig. 6A) and thicknesses in the range from 9.4 to 14.9 ⁇ on the other face (Fig. 6B).
  • Test No. 6 The process parameters for Test No. 6 were as follows:
  • Test No. 6 in terms of thickness of the anodic oxide as expressed in microns, are shown in Figures 7A and 7B with the values recorded in the areas highlighted by a circle.
  • the thicknesses obtained for the anodic oxide varied, for example with thicknesses in the range from 6.3 to 8.7 ⁇ on one face (Fig. 7A) and thicknesses in the range from 6.3 to 9.1 ⁇ on the other face (Fig. 7B).
  • Test No. 7 The process parameters for Test No. 7 were as follows:
  • Test sample was subjected to an anodizing cycle in which voltage and current were varied as shown in Table 5 below for a total time of 8 minutes.
  • Test No. 7 in terms of thickness of the anodic oxide as expressed in microns, are shown in Figures 8A and 8B with the values recorded in the areas highlighted by a circle.
  • the thicknesses obtained for the anodic oxide varied, for example with thicknesses in the range from 7.1 to 13 ⁇ on one face (Fig. 8A), and thicknesses in the range from 6.1 to 12.5 ⁇ on the other face (Fig. 8B).
  • Test No. 8 The process parameters for Test No. 8 were as follows:
  • Test No. 8 in terms of thickness of the anodic oxide as expressed in microns, are shown in Figures 10A, 10B, IOC and 10D, corresponding to faces A-D as indicated in Figure 10, with the values recorded in the areas highlighted by a circle.
  • the thicknesses obtained for the oxide were in the range from 5.1 to 7.9 ⁇ on face A (Fig. 10A), from 5.5 to 14 ⁇ on face B (Fig. 10B), from 2.5 to 6.9 ⁇ on face C (Fig. IOC) and of about 5.5 ⁇ in average thickness on face D (Fig. 10D).
  • Test No. 9 The process parameters for Test No. 9 were as follows:
  • pre-dip 2,5 mg/dm 2 ;
  • Test No. 10 for both samples 26 and 27 were on average equal to 5 ⁇ in terms of thickness of anodic oxide.
  • pre-dip 3,0 mg/dm 2 ;
  • Tests No. 9 and No. 10 were compared with those obtained for a sample which was anodized by dipping in a static bath with the following process conditions:
  • Table 8 shows the results obtained for the two samples subjected to "jet" anodizing and, for comparison purposes, the results obtained for the sample subjected to in-tank anodizing.
  • the cathode used for the described tests was an extruded aluminium cathode made of alloy EN AW 6060, however, it is clearly possible to use any other metal having improved characteristics of corrosion resistance (for example Al SI 316 L) when dipped into an electrolyte solution.
  • a system for anodizing treatment of aluminium and alloys thereof which comprises a particular metallic cathode positioned within the electrolyte dispensing tank.
  • the dispenser is perforated and equipped with pipes and/or nozzles to allow the electrolyte solution to be supplied as a jet capable of anodizing objects made of aluminium and alloys thereof when these objects are positioned at the anode of a direct current electric circuit.

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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)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention concerne une installation et un procédé de traitement continu d'anodisation de produits faits en aluminium ou alliages de ce dernier. L'installation comprend un moyen pour introduire des produits le long d'un trajet de traitement, au moins un réservoir pour recueillir et/ou stocker une solution électrolytique liquide et une pluralité de tuyaux faits en un matériau électriquement isolant et conçus pour envoyer des jets de la solution électrolytique liquide vers les produits le long du trajet de traitement, la solution étant mise sous pression par une pompe. Des électrodes cathodiques sont agencées en contact électrique avec la solution électrolytique liquide et des électrodes anodiques sont agencées en contact électrique avec les produits.
EP15718575.2A 2014-03-11 2015-03-10 Installation et procédé de traitement d'anodisation de produits faits en aluminium ou alliages de ce dernier Active EP3117028B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20140385 2014-03-11
PCT/IB2015/000307 WO2015136353A1 (fr) 2014-03-11 2015-03-10 Installation et procédé de traitement d'anodisation de produits faits en aluminium ou alliages de ce dernier

Publications (2)

Publication Number Publication Date
EP3117028A1 true EP3117028A1 (fr) 2017-01-18
EP3117028B1 EP3117028B1 (fr) 2019-11-20

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Country Link
EP (1) EP3117028B1 (fr)
ES (1) ES2772808T3 (fr)
WO (1) WO2015136353A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
IT201900020386A1 (it) * 2019-11-05 2021-05-05 Otefal Ingegneria S R L Impianto e procedimento di anodizzazione di profilati in alluminio o sue leghe.

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Publication number Priority date Publication date Assignee Title
CN108546973B (zh) * 2018-05-11 2019-05-31 江苏礼德铝业有限公司 一种铝镁合金桥架的制造方法
CN108315794B (zh) * 2018-05-11 2019-06-07 江苏华美特金属科技有限公司 一种铝镁合金阳极氧化表面处理设备
CN111118567B (zh) * 2020-01-17 2022-03-25 西安凯美泰科环保科技有限公司 一种微弧氧化装置及航空集装托盘氧化膜层的制备方法

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US4225399A (en) * 1979-04-25 1980-09-30 Setsuo Tomita High speed aluminum anodizing
US5421987A (en) * 1993-08-30 1995-06-06 Tzanavaras; George Precision high rate electroplating cell and method
KR101058917B1 (ko) * 2003-03-11 2011-08-23 가부시키가이샤 에바라 세이사꾸쇼 전기 도금 장치
DE102007026633B4 (de) * 2007-06-06 2009-04-02 Atotech Deutschland Gmbh Vorrichtung und Verfahren zum elektrolytischen Behandeln von plattenförmiger Ware
ITPR20100047A1 (it) 2010-05-21 2011-11-22 Massimiliano Gazzani Metodo e impianto per l'anodizzazione di un profilato in alluminio o sue leghe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900020386A1 (it) * 2019-11-05 2021-05-05 Otefal Ingegneria S R L Impianto e procedimento di anodizzazione di profilati in alluminio o sue leghe.
WO2021090229A1 (fr) * 2019-11-05 2021-05-14 Otefal Ingegneria S.R.L. Installation et procédé d'anodisation de profils d'aluminium

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ES2772808T3 (es) 2020-07-08
EP3117028B1 (fr) 2019-11-20
WO2015136353A1 (fr) 2015-09-17

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