EP3498890A1 - Procédé de décapage pour profilés, bandes laminées et tôles d'alliages d'aluminium - Google Patents

Procédé de décapage pour profilés, bandes laminées et tôles d'alliages d'aluminium Download PDF

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Publication number
EP3498890A1
EP3498890A1 EP17206709.2A EP17206709A EP3498890A1 EP 3498890 A1 EP3498890 A1 EP 3498890A1 EP 17206709 A EP17206709 A EP 17206709A EP 3498890 A1 EP3498890 A1 EP 3498890A1
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EP
European Patent Office
Prior art keywords
aluminum alloy
alloy product
pickling
alkaline
seconds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17206709.2A
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German (de)
English (en)
Inventor
Kathrin Eckhard
Olaf Güssgen
Oliver Bauer
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.)
Speira GmbH
Original Assignee
Hydro Aluminium Rolled Products GmbH
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 Hydro Aluminium Rolled Products GmbH filed Critical Hydro Aluminium Rolled Products GmbH
Priority to EP17206709.2A priority Critical patent/EP3498890A1/fr
Priority to PCT/EP2018/084591 priority patent/WO2019115628A1/fr
Priority to EP18814645.0A priority patent/EP3724375A1/fr
Priority to CN201880080015.XA priority patent/CN111448343B/zh
Priority to JP2020531920A priority patent/JP7216097B2/ja
Publication of EP3498890A1 publication Critical patent/EP3498890A1/fr
Priority to US16/900,027 priority patent/US20200308713A1/en
Withdrawn legal-status Critical Current

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    • 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
    • C25D11/16—Pretreatment, e.g. desmutting
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals
    • 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

Definitions

  • the invention relates to a cleaning method for aluminum alloy products for producing a uniform surface appearance and excellent corrosion resistance and aluminum alloy products produced by the method according to the invention.
  • rolling oil or rolling emulsion which is incorporated into the surface of the aluminum alloy strip together with other particles due to the rolling steps, is used particularly in the rolling steps.
  • heat treatments preferably annealing, that is, for example, intermediate annealing or final annealing, in order to convert the aluminum alloy strips into a specific structural state or to set the desired mechanical characteristics.
  • the annealing of an aluminum alloy strip leads to an accumulation of alloy constituents, such as zinc, silicon, copper or magnesium, in particular magnesium oxides, in regions of the strip close to the surface. This surface enrichment, whether due to heat treatment of the strip or by the rolling process or generally due to the alloy composition, results in a darker surface of the aluminum alloy strip so that even after degreasing the aluminum alloy strip has a dark surface appearance.
  • the contaminants on the surface of the aluminum alloy strip thus include dirt, metal debris and oil or oil degradation products.
  • defects may be present in the oxide layer on the surface of the aluminum alloy strip. Namely, it is known that the deformation of aluminum materials at elevated temperature changes the surface properties by formation of disturbed near-surface microcrystalline structures (Wear 206 (1997), 168).
  • the aluminum alloy strip may be subjected to acid pickling.
  • acid pickling Particularly good results are obtained when the aluminum alloy strip is first subjected to an alkaline pickling or mild alkaline degreasing and in a subsequent step to an acidic rinse or acid pickling.
  • Such a method is in the WO 2013/113598 A1 and is used industrially for the production of aluminum sheets for all possible applications, in particular for applications in the automotive industry.
  • the pickling is less than with the sole alkaline stain.
  • the alkaline stain is used to clean up the surface structure of the aluminum alloy strip.
  • alkali-insoluble constituents of the oxide layer such as magnesium oxides, remain on the surface of the strip. These are removed by the acid sink (decapitation), in particular, protruding magnesium oxide structures are removed at the surface of the strip.
  • the term surface is also understood to mean the layer having a thickness of preferably less than 0.5 ⁇ m, more preferably less than 0.2 ⁇ m, from the surface of the aluminum alloy product to the interior thereof (z-direction).
  • the invention is therefore based on the object to provide a method by which aluminum alloy products (workpieces) are obtained which do not have this gray to grayish brownish edge or defect.
  • This defect is clearly visible in aluminum alloy tapes and other aluminum alloy products with a relatively higher proportion of magnesium or aluminum alloy tapes and other aluminum alloy products in which the magnesium content on the surface is enriched by a thermal process (eg, annealing). Nevertheless, this method is also advantageously feasible with other aluminum alloys.
  • the addressed inhomogeneity can be removed by sequentially exposing the aluminum alloy product to multiple pH jumps.
  • the problem underlying the invention is therefore solved by first subjecting an aluminum alloy product to an acid pre-cleaning, then carrying out an alkaline pickling degreasing and subsequently treating the band with an acid sink (three-stage process).
  • the aluminum alloy product can be cleaned by an alkaline pickling degreaser, a subsequent acid rinse, a re-alkaline treatment, and a subsequent further acid rinse (four step process).
  • the invention also provides a process for providing an aluminum alloy product in which a rolled, strip-shaped aluminum alloy product is unwound from a coil, subjected to the surface cleaning or surface modification according to the invention described above, then optionally passivated and rewound into a coil.
  • the invention further provides a process for providing an aluminum alloy product in which an extruded aluminum alloy extrudes into a profile, subjected to the above-described surface cleaning or surface modification according to the invention and then optionally passivated on the surface and optionally subjected to further shaping and optionally powder-coated.
  • the subject matter of the invention is an aluminum alloy product which has been obtained by the process according to the invention and which does not have the described surface inhomogeneity despite a strong pickling removal.
  • the inventive sequence of these at least three pickling steps is new and surprisingly leads to better properties.
  • the process of the present invention provides aluminum alloy ribbons and sheets having an improved surface appearance, with improved corrosion test results, and allows an increase in the speed of surface treatment of the metal strip because the treatment time in the alkaline degreasing can be shortened without affecting the quality of the strip.
  • aluminum alloy product in the sense of the invention comprises aluminum alloy strips, aluminum alloy sheets and aluminum alloy profiles.
  • Aluminum alloy ribbons can be produced by rolling billets or cast strips.
  • Aluminum alloy profiles are produced by extrusion.
  • the term aluminum alloy ribbon is used to represent all of these aluminum alloy products.
  • the process according to the invention is an optimized pickling and surface cleaning process for aluminum alloy strips. It is particularly advantageous for annealed aluminum alloy products that are to be sharply pickled.
  • the surface layers of the aluminum alloy strip enriched with magnesium / magnesium oxide or other acid-soluble alloying elements are removed in the acid prepurification.
  • the alkaline stain removes the near-surface alumina matrix and also carries aluminum and alkali-soluble alloying elements and intermetallic phases.
  • the following acid sink leads to the removal of near-surface alloying elements and intermetallic phases, which are still present even after alkaline pickling.
  • the inventive method allows the achievement of better surface properties, saves time and resources.
  • the appearance of the tape is improved.
  • the irregular lateral discoloration of the aluminum alloy strip are no longer present after the pickling process according to the invention.
  • a homogeneous appearance is present over the entire surface of the aluminum alloy strip. From this homogeneous optical appearance it can be concluded that the surface at each point of the aluminum alloy strip is prepared in the same way for the subsequent processes. Local differences which indicate different properties of the surface are visibly removed by the method according to the invention and thus a result which is constant over the bandwidth and length is achieved.
  • the pickling result as a chemical reaction basically always depends on the concentration of the reactants, the temperature and the contact time.
  • the surprisingly higher efficiency of the alkaline pickling step now allows economic, ecological or qualitative advantages, since either the treatment temperature is lowered or the concentration in the pickling degreasing reduced or the treatment time is shortened (faster line speed) or generated in the same time a higher pickling and an even cleaner surface can be.
  • the starting material of the process according to the invention is, for example, an aluminum alloy strip. This has been produced by hot rolling an aluminum billet and cold rolling or by strip casting and cold rolling.
  • the aluminum alloy strip may have been annealed.
  • the aluminum alloy used may be of the class AA 5xxx, for example AA 5005, AA 5083, more preferably AA 5182, AA 5754, AA 5454, AA 5251 and AA 5018, or also of the type AA 1xxx, for example AA 1050, AA 1110 and AA 1200, or of type AA 3xxx, for example AA 3003, AA 3004, AA 3005, AA 3103, AA 3104 and AA 3105, or of type AA 6xxx, for example AA 6016, AA 6014, AA 6005C, AA 6060, AA 6070 and AA 6451 or AA 7xxx and AA type 8xxx, for example AA 8006, AA 8011 and AA 8079 according to the International Allo
  • the process according to the invention is furthermore particularly advantageous for any aluminum alloys which, during their production, have undergone annealing, preferably an intermediate annealing, and / or have been annealed or recolored or solution annealed to adjust the state.
  • alloying elements diffuse to the surface and can accumulate there.
  • the diffusion rate of the individual alloying elements can be different.
  • the inventive method is therefore particularly advantageous for annealed in the coil aluminum strips in which, as stated above, inhomogeneities by varying amounts and / or modifications of, for example, magnesium (oxide) or other alloying components such as zinc, silicon, copper occur on the surface of the aluminum strip can.
  • the abovementioned alloy components can migrate to the surface during the thermal treatment in the coil and lead to a laterally different structure of the oxide layer on account of the locally different supply of oxygen between the layers of the wound coil entering through the coil mirror. All that matters is that the aluminum strip has undergone a heat treatment in the coil during its manufacture. Discoloration or shades on the aluminum tape surface As a result of heat treatments in the coil, both in the form of intermediate annealing in the coil and in the form of final annealing in the coil, can be almost completely eliminated by the inventive method.
  • an AlMg4.5 alloy, a typical AA5xxx aluminum alloy for automotive sheet, in the as-annealed state may have a surface concentration of Mg of quite 20% or more.
  • an AlMgSi alloy of nominally 0.5 wt.% Mg, also a typical AA6xxx aluminum alloy for automotive sheets or extruded profiles, throughout the alloy may have a magnesium surface concentration of 5 wt.% Or greater in solution annealed condition T4, for example.
  • the tabulated concentrations of the alloying ingredients give little indication of the composition that is actually chemically processed on the surface of the pickling degreasing medium. All thermally treated alloys containing, for example, Zn, Mg, Si, Cu or other fast-diffusing alloying elements can benefit in a particular way from the process according to the invention.
  • the material removal from the surface of the aluminum alloy strip after annealing by the method according to the invention is less than 100 nm, preferably less than 50 nm. Consequently, it is preferable to remove only the surface layer in which an enrichment of magnesium and magnesium oxide is present.
  • the pre-cleaning of the aluminum alloy strip used according to the invention is carried out with an acidic cleaning solution.
  • This may be an aqueous solution of at least one mineral acid, for example an aqueous sulfuric acid, nitric acid, phosphoric acid and / or hydrofluoric acid-containing solution. These mineral acids can be present in the acid pickling solution in a concentration of 0.2 to 10 wt .-%.
  • the concentration of nitric acid may preferably be 0.2 to 5 wt .-%, particularly preferably 1.5 to 4 wt .-% and that of sulfuric acid preferably 0.5 to 5 wt .-%, particularly preferably 1.5 to 3, 5 wt .-%, each based on the mass of the acidic pickling solution.
  • the acidic solution may contain 50 to 1000 ppm of fluoride, preferably 100 to 500 ppm, more preferably 200 to 400 or 600 to 800 ppm Fluoride.
  • the acidic cleaning solution may be honeydew and contain other ingredients.
  • One or more surfactants in the aqueous pickling solution can aid in the degreasing of the surface of the aluminum alloy strip and increase the uniformity and rate of pickling of the acid pickling solution in the prepurification step.
  • one or more non-ionic or one or more anionic or cationic surfactants or a mixture thereof are used.
  • the cleaning of the tape can be assisted by the use of complexing agents.
  • the acid pre-cleaning may preferably last 0.5 to 15 seconds, more preferably 1 to 8 seconds, or 1 to 5 seconds.
  • a rinsing of the strip takes place.
  • This rinse can be done in one or more stages.
  • the rinsing liquid can be water.
  • the rinsing liquid may contain, in addition to water, a surfactant and optionally further additives which promote the rinsing action.
  • the alkaline pickling liquid contains alkali metal and / or alkaline earth metal hydroxides or carbonates.
  • alkali metal hydroxides are used. Particularly preferred is sodium hydroxide.
  • the concentration of the alkali metal or alkaline earth metal hydroxide is preferably 0.2 to 3 wt .-%, particularly preferably 0.4 to 2.5 wt .-% or 0.5 to 1.5 wt .-%, each based on the mass the alkaline pickling liquid.
  • the alkaline pickling liquid may contain additives. Suitable additives are, for example, surfactants and complexing agents. The surfactants are preferably selected from nonionic and anionic surfactants.
  • Surfactants can be used in a concentration of 0.13 to 2 wt .-%, based on the mass of the alkaline pickling liquid.
  • Suitable complexing agents are, for example, polyphosphates, phosphonates, gluconates, citrates and oxalates. These may also be present in a mixture in the alkaline pickling liquid. They can be used as sodium salts.
  • the residence time of the aluminum alloy strip in the alkaline pickling liquid can generally be 11 to 45 seconds in the two-stage process (alkaline degreasing and subsequent acid treatment - known process). It has now surprisingly been found that because of the positive effects of the acidic pre-cleaning for the result of the entire pickling stage, the residence time in the alkaline pickle in the three-stage pickling process can be reduced. So the residence time can be 1 to 25 seconds. But if a speed increase is desired, the residence time can be shortened to 1.5 to 15 seconds or 1, 5 to 3 seconds or 1.5 to 6 seconds. These residence times allow sufficient cleaning, degreasing and pickling of the surface of the aluminum alloy strip in the method according to the invention.
  • the inventive method allows in a highly automated industrial process, an increase in the production speed of 100 meters / minute up to 150 meters / minute.
  • the residence time of the aluminum alloy strip in the degreasing medium may also be dependent on the lye concentration and the pH.
  • the sharper the pickling is set the faster the material removal. It is known that too strong an alkaline attack can bring surface inhomogeneities even more clearly.
  • the at least three-stage process according to the invention surprisingly increases the degrees of freedom here.
  • the contact times can be extended accordingly depending on the severity of the glow defect.
  • the residence time of the aluminum alloy strip in the degreasing medium can also be influenced by the temperature of the degreasing medium by adjustment to 50 ° C to 85 ° C, preferably 60 ° C to 80 ° C, more preferably 65 ° C to 75 ° C.
  • the elevated temperature leads to a higher reactivity of the degreasing medium and thus to a more intensive pickling attack.
  • rinsing of the strip may be performed.
  • One or more rinsing steps can take place.
  • the rinsing liquid can be water.
  • the rinsing liquid may contain, in addition to water, a surfactant and optionally further additives which promote the rinsing action.
  • the degreased aluminum alloy strip is treated with an acidic pickling liquor containing a strong mineral acid.
  • the composition of the acid pre-cleaning solution and the acid pickling solution can be identical. Suitable strong mineral acids are consequently nitric acid, sulfuric acid and phosphoric acid.
  • the concentration of the strong mineral acid in the acid pickling liquid can be from 0.2 to 10% by weight, based on the mass of the acid pickling liquid.
  • the concentration of nitric acid is preferably 0.2 to 5% by weight, more preferably 1.5 to 4% by weight, and the concentration of sulfuric acid is preferably 0.5 to 5% by weight, more preferably 1.5 to 3.5% by weight.
  • the pickling effect of the acid sink can be adjusted by adding hydrofluoric acid or fluorides.
  • Suitable fluoride concentrations are 50 to 1000 ppm, preferably 100 to 500 ppm, more preferably 200 to 400 or 600 to 800 ppm fluoride.
  • the duration of this second acidic rinse may preferably be 0.5 to 15 seconds, in particular 1 to 8 seconds, particularly preferably 1 to 5 seconds.
  • the aluminum alloy ribbon is preferably rinsed.
  • This rinse is done with water or an aqueous liquid.
  • one, two or more rinses may be taken between and after the pickling treatments.
  • the rinse steps of the final rinse may also be eliminated to achieve a more drastic pH jump.
  • the final rinse is preferably carried out with demineralized water, more preferably at high temperature, for example 60 ° C to 95 ° C. Afterwards the tape can be dried.
  • the three-stage as well as the four-stage pickle of the aluminum alloy product are made by spraying the aluminum alloy product with the respective pickling liquors and treating them by optional rinsing between the pickling treatments and after the last pickling.
  • Aluminum alloy strips can also be passed through pickling baths with the corresponding pickling liquids, it being possible for rinsing baths to be arranged between the pickling baths.
  • the application of the treatment solutions can be carried out in the process according to the invention consequently by dipping, by flooding and squeezing or by a spray treatment.
  • Spray applications generally require shorter contact times than immersion treatments at comparable chemical concentrations and treatment temperatures.
  • an acid pre-cleaning is carried out.
  • a rinse of the aluminum alloy strip can take place.
  • the alkaline pickling / degreasing takes place.
  • the final acidic sink of the aluminum alloy strip takes place. This may be followed by one or more rinses or rinses again.
  • the conclusion is preferably a sink with demineralized water ( ⁇ ⁇ 30 ⁇ S)
  • a four-stage cleaning can also be carried out.
  • the four-stage cleaning is first from the WO 2013/113598 A1 performed two-stage cleaning step with alkaline pickling and subsequent acid rinse and then treated again alkaline and then treated with acid.
  • Advantage of this procedure is that by a shorter alkaline Pickling treatment and subsequent acid rinse the alkaline pickling in the second pass significantly faster.
  • the sum of the duration of the first alkaline stain and the second alkaline may be shorter than the duration of the single stain in the one of WO 2013/113598 A1 known methods.
  • the treatment time or residence time of the aluminum alloy product in the first alkaline stain may be 1 to 12 seconds, preferably 1 to 5 seconds.
  • the treatment time or residence time of the aluminum alloy product in the first acidic sink may be 0.5 to 15 seconds, especially 1 to 8 seconds.
  • the treatment time or residence time of the aluminum alloy product in the second alkaline stain may be 1 to 12 seconds, preferably 1 to 5 seconds.
  • the treatment time or residence time of the aluminum alloy product in the second first acidic sink may be 0.5 to 15 seconds, especially 1 to 8 seconds.
  • the treatment time of the first pickling process is only half the time of the second pickling process.
  • a surface passivation of the aluminum alloy strip for example by a chromating, a chromium-free passivation based on zirconium and / or titanium or a Passivation based on sol-gels or silanes done.
  • Other passivations are also conceivable.
  • a no-rinse method is used to apply the surface passivation.
  • the surface passivation simplifies subsequent process steps, for example, the joining of the components by means of adhesives, or by welding, the phosphating or the surface finish, and ensures In addition, for a sufficient protection against the surface quality of the band affecting influences.
  • the surface passivation is preferably carried out "inline" with the cleaning method or pickling method according to the invention. Accordingly, the "inline" surface passivation can take place immediately after rinsing following the last acid sink of the strip in the same plant, without winding the strip before surface passivation. As a result, the surface condition of the aluminum alloy strip can be optimally preserved.
  • Fig. 1 shown aluminum alloy strip has a high magnesium content and corresponds to a composition according to AA5182. It shows at the edges the defect already described here, which manifests itself in an irregular wavy gray-brown stripe.
  • This tape was first rendered alkaline (0.5% NaOH, 1.5% of a degreaser composition of nonionic and anionic surfactants and complexing agents, contact time 45 sec.) And then pickled (2% HNO 3 + 300ppm F - ; sec.).
  • This in Fig. 2 The tape shown is from the same batch as the tape in Fig. 1 , The band off Fig.
  • H + before denotes the acid prepurification
  • OH stands for the alkaline dressing
  • H + for the subsequent acidic rinse
  • the acidic stain contained 5% by weight of HNO 3 at room temperature alkaline stain contained 2 wt% NaOH and 2 wt% of a degreaser composition at a temperature of 70 ° C.
  • the plate CV-1 provides after pickling the surface appearance of the photograph of Fig. 1 with an inhomogeneous surface staining.
  • Sample CV-2 shows a good result with a matt and homogeneous surface.
  • Sample CV-3 shows the best result with a matt and homogeneous appearance of the surface.
  • the sample CV-4 is better than sample CV-1, but still shows an inhomogeneous appearance.
  • the surface of Sample CV-5 shows a slightly inhomogeneous appearance with slight discoloration.
  • Table 2 shows that the number of corrosive threads after the two-stage standard pickling process with 56.1 threads to 50 mm greater than after the pickling process according to the invention with 51.4 threads to 50 mm.
  • the sheet obtained according to the invention thus shows better resistance to filiform corrosion. Overall, a better filiform factor results for the sheets according to the invention.
  • a graphical representation of the test effects is in Fig. 3 shown.
  • the pickling results of a four-stage pickling process according to the invention are shown below in Table 3.
  • the treatment of an aluminum alloy sheet aluminum alloy sheet AA5182 described in detail in the publication "The Aluminum Association International Alloy Designations" was carried out by immersion in a bath with a first alkaline pickling, rinsing with water, immersion in a bath with a first acidic Sink, rinse with water, dipping in a bath with a second alkaline stain, rinsing with water, immersing in a bath with second acidic sink and rinsing with water.
  • the composition of the two alkaline baths is the same and the composition of the two acidic sinks is the same.
  • the alkaline pickling liquor contains 2% by weight of NaOH and 2% by weight of a degreaser composition and had a temperature of 70 ° C.
  • the acidic sink contains 5% by weight of HNO 3 at room temperature.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • ing And Chemical Polishing (AREA)
EP17206709.2A 2017-12-12 2017-12-12 Procédé de décapage pour profilés, bandes laminées et tôles d'alliages d'aluminium Withdrawn EP3498890A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17206709.2A EP3498890A1 (fr) 2017-12-12 2017-12-12 Procédé de décapage pour profilés, bandes laminées et tôles d'alliages d'aluminium
PCT/EP2018/084591 WO2019115628A1 (fr) 2017-12-12 2018-12-12 Procédé de décapage pour profilés, bandes laminées et tôles en alliages d'aluminium
EP18814645.0A EP3724375A1 (fr) 2017-12-12 2018-12-12 Procédé de décapage pour profilés, bandes laminées et tôles en alliages d'aluminium
CN201880080015.XA CN111448343B (zh) 2017-12-12 2018-12-12 用于由铝合金构成的型材、轧制带和板材的腐蚀方法
JP2020531920A JP7216097B2 (ja) 2017-12-12 2018-12-12 アルミニウム合金からなる形材、圧延されたストリップおよび薄板のためのピックリング方法
US16/900,027 US20200308713A1 (en) 2017-12-12 2020-06-12 Pickling method for profiles, rolled strips, and sheets made of aluminium alloys

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EP17206709.2A EP3498890A1 (fr) 2017-12-12 2017-12-12 Procédé de décapage pour profilés, bandes laminées et tôles d'alliages d'aluminium

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EP3498890A1 true EP3498890A1 (fr) 2019-06-19

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EP18814645.0A Pending EP3724375A1 (fr) 2017-12-12 2018-12-12 Procédé de décapage pour profilés, bandes laminées et tôles en alliages d'aluminium

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US (1) US20200308713A1 (fr)
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JP (1) JP7216097B2 (fr)
CN (1) CN111448343B (fr)
WO (1) WO2019115628A1 (fr)

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CN113083897B (zh) * 2021-04-07 2022-12-27 太原晋西春雷铜业有限公司 一种铜或者铜合金带材高均匀性表面的制备方法

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EP0230903A2 (fr) * 1986-01-21 1987-08-05 HENKEL CORPORATION (a Delaware corp.) Procédé de nettoyage de récipients en aluminium
DE102005050556B3 (de) * 2005-10-17 2007-03-22 Mack Gmbh Verfahren zur Reinigung von metallhaltigen Oberflächen und Verwendung einer Reinigungslösung
EP2623639A1 (fr) * 2012-02-02 2013-08-07 Hydro Aluminium Deutschland GmbH Bande d'alliage en aluminium ayant une surface avec un aspect visuel amélioré et son procédé de fabrication
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