Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
  • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
  • C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
  • C23C22/44—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
  • C23C22/76—Applying the liquid by spraying
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/78—Pretreatment of the material to be coated
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/78—Pretreatment of the material to be coated
  • C23C22/80—Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/82—After-treatment
• • 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

Definitions

• the invention relates to a method for pretreating workpieces with a surface made of aluminum or aluminum alloys for non-cutting forming and/or joining by welding or gluing with similarly pretreated or optionally otherwise precoated workpieces or with optionally pretreated parts made of steel and/or galvanized and/or alloy-galvanized steel, as well as for subsequent anti-corrosive treatment by phosphating, by a chromium-free conversion treatment, by applying a primer or by painting.
• the joining of the parts is usually followed by an anti-corrosive treatment, which, depending on the nature of the parts to be joined, can consist of a phosphating treatment, a chromium-free conversion treatment, a primer application or a coating.
• an anti-corrosive treatment which, depending on the nature of the parts to be joined, can consist of a phosphating treatment, a chromium-free conversion treatment, a primer application or a coating.
• EP-B-700 452 proposes to bring surfaces made of aluminium or its alloys into contact with an aqueous solution containing complex fluorides of the elements boron, Silicon, titanium, zirconium or hafnium, individually or in a mixture with one another, in fluoro anion concentrations of 100 to 4000 mg/l in total and with a pH value of 0.3 to 3.5.
• the parts made of aluminum or its alloys are subjected to a non-cutting and/or machining deformation process and/or are bonded to one another or to parts made of steel and/or galvanized and/or alloy-galvanized steel by gluing and/or welding.
• the solution which may contain polymers of a certain nature, can be applied by spraying, dipping or using the no-rinse process, whereby in the case of the no-rinse process the wet film quantity should be between 2 and 10, preferably between 4 and 6 ml/m 2 of metal surface. Regardless of the form of application of the solution, it is advantageous to dry at temperatures between 40 and 85 °C.
• the parts made of aluminum or its alloys are cleaned with acid or alkali before the first conversion treatment; preferably, cleaning steps and intermediate rinsing with water and/or with activating rinsing baths are carried out before the permanent corrosion-protective treatment.
• a treatment of workpieces with a surface made of aluminium or aluminium alloys with compositions based on the fluoro anions of zirconium and/or molybdate is described in each of the publications DE 102012017438 A1 , CN104294258A , EP1200641A1 , WO 2005/021834 A1 , US 2003/213533 A1 and EP2532769A1 disclosed.
• the object of the invention is to provide a method for pretreating workpieces with a surface made of aluminum or aluminum alloys for non-cutting forming and/or joining by welding or gluing, in particular for joining by gluing, with similarly pretreated or otherwise precoated workpieces or with parts made of steel and/or galvanized and/or alloy-galvanized steel, in particular with similarly pretreated workpieces, as well as a subsequent permanent corrosion-protection treatment by phosphating and/or by a chromium-free conversion treatment as well as by applying primer and/or painting, in particular by phosphating and a chromium-free conversion treatment as well as by painting, which regularly leads to workpieces with a sufficiently low volume resistance and at the same time good phosphatability and adhesive adhesion.
• the process according to the invention should also lead to good temporary corrosion protection values and be largely insensitive to bath contamination by aluminum ions.
• the aqueous, acidic solution in step c) in the case of dip or spray application contains Zr and Mo in a weight ratio of 15:1 to 5:1, particularly preferably 13:1 to 7:1 and very particularly preferably 11:1 to 9:1.
• the resulting layer weight after drying is 2 to 12 mg/m 2 , particularly preferably 2 to 10 mg/m 2 and very particularly preferably 2 to 8 mg/m 2 of Zr and Mo.
• the aqueous solution When applied by immersion or spray, the aqueous solution preferably contains 250 to 700 mg/l Zr and 30 to 80 mg/l Mo, particularly preferably 400 to 600 mg/l Zr and 40 to 60 mg/l Mo, and very particularly preferably 475 to 525 mg/l Zr and 45 to 55 mg/l Mo.
• the aqueous solution when applied by immersion or spray, preferably has a pH of 3.1 to 4.3 and particularly preferably 3.6 to 4.0 and preferably a temperature of 20 to 50 °C and particularly preferably 20 to 30 °C.
• the aqueous, acidic solution in step c) when applied by the roller application process contains Zr and Mo in a weight ratio of 1.7:1 to 1:1.7, particularly preferably 1.4:1 to 1:1.4 and very particularly preferably 1.1:1 to 1:1.1.
• the result after drying is preferably a layer weight of 2 to 12 mg/m 2 , particularly preferably 2 to 10 mg/m 2 and very particularly preferably 2 to 8 mg/m 2 of Zr and Mo.
• the aqueous solution preferably contains 1.0 to 6.0 g/l Zr and 1.0 to 6.0 g/l Mo, particularly preferably 2.0 to 4.0 g/l Zr and 2.0 to 4.0 g/l Mo and very particularly preferably 2.8 to 3.2 g/l Zr and 2.8 to 3.2 g/l Mo.
• the aqueous solution when applied by roller application preferably has a pH value of 1.4 to 2.7 and particularly preferably of 1.8 to 2.5 on.
• step c) With regard to the defined coating weight of zirconium and molybdenum (2 to 15 mg/m 2 ) to be set in each case, it is of crucial importance that, depending on the type of application - dip or spray application on the one hand, application using the roller application method on the other hand - aqueous, acidic solutions of different compositions are used in step c) with regard to the concentration and ratio of the fluorozirconate and molybdate anions and the pH value.
• the aqueous, acidic solution in step c) can be provided by previously diluting a corresponding concentrate, preferably by a factor of 1:30 to 1:100, more preferably by a factor of about 1:50, preferably with water and optionally adjusting the pH value.
• the workpieces are pickled with an aqueous, acidic solution containing mineral acid by immersion or spraying.
• Alkaline cleaning results in the formation of zirconium/molybdenum layers with poor volume resistance values.
• the workpieces pretreated according to the invention can be joined to workpieces that have been pretreated in the same way or, if appropriate, precoated in a different way, e.g. phosphated workpieces, with surfaces made of aluminum or its alloys. If a connection to parts made of steel and/or galvanized and/or alloy-galvanized steel is intended, these parts can have bare or precoated surfaces.
• a suitable precoating can be, for example, a phosphate layer with a layer weight of a maximum of 2 g/m 2 or a layer of a conductive primer.
• a cleaning/degreasing step must be carried out before the pickling process or the pickling process must be carried out in such a way that cleaning/degreasing takes place at the same time.
• the latter can be done by adding surfactant to the pickling solution.
• Phosphating treatment processes that use solutions based on zinc phosphate, particularly low-zinc technology, or alkali phosphate are the most popular.
• the solutions can be modified by adding small amounts of other polyvalent cations, such as calcium, magnesium, nickel, copper or manganese.
• These acidic solutions may additionally contain at least one organosilane and/or at least one hydrolysis product thereof and/or at least one condensation product thereof.
• the at least one organosilane preferably has at least one amino group. It is particularly preferably one which can be hydrolyzed to an aminopropylsilanol and/or to 2-aminoethyl-3-aminopropylsilanol and/or a bis(trimethoxysilylpropyl)amine.
• reaction primers or adhesion primers can be applied as primers.
• the pretreatment of the workpieces according to the invention ensures sufficient, temporary corrosion protection for longer storage periods. During this time, there is no negative influence on the weldability, in particular on electrical resistance welding, or on the bondability. With regard to weldability, it is also guaranteed that the volume resistance is practically the same on all surface areas of the workpiece.
• Workpieces within the meaning of the present invention are strip, sheet metal and individual parts such as profiles.
• the solution according to step c) can be applied by spraying or dipping, with or without rinsing with water.
• rinsing When applying without rinsing with water, it is advantageous to remove excess treatment solution by squeezing it.
• applying the treatment solution using the roll coater method is particularly advantageous. It allows a defined setting of the desired wet film thickness in one operation.
• the workpiece is dried or the solution is dried.
• Object temperatures of 30 to 90 °C are particularly advantageous.
• Concentrates are usually used to prepare the treatment liquids, which are diluted with low-salt water, preferably demineralized water, to the concentrations to be set.
• low-salt water preferably demineralized water
• concentrations to be set it is particularly advantageous to introduce the required fluoro anions of the zirconium using the free acid and to adjust the respective pH value if necessary by adding ammonia.
• the molybdate is advantageously introduced as ammonium heptamolybdate and/or sodium heptamolybdate, preferably as ammonium heptamolybdate and particularly preferably as ammonium heptamolybdate x 7 H 2 O.
• molybdate also includes protonated forms such as, in particular, molybdic acid.
• the pickling of the workpieces is carried out with an aqueous, acidic solution containing mineral acid. It can be carried out electrolytically or chemically. In electrolytic pickling, phosphoric acid is a particularly suitable mineral acid. Chemical pickling, which is generally preferred because it requires less equipment, can be carried out with nitric acid or nitric acid/hydrofluoric acid.
• the workpieces are pickled by spraying or dipping with a solution that contains surfactant, sulfuric acid and a compound selected from the group consisting of hydrofluoric acid, phosphoric acid and iron(III) sulfate, preferably hydrogen fluoride, with solutions containing 3 to 8 g/l sulfuric acid, 50 to 150 mg/l non-complexed, free fluoride and 1 to 3 g/l non-ionic surfactant having proven to be particularly suitable.
• Non-ionic surfactants are ethylene oxide adducts. fatty alcohols and, for example, abietic acid.
• the measurement of free fluoride was carried out using a fluoride-sensitive electrode, whereby the electrode was calibrated using solutions whose pH was identical to that of the solution to be tested.
• the pickling process should be carried out in such a way that a metal removal of approximately 0.1 to 0.6 g/m 2 of workpiece surface is achieved.
• the water rinsing following the pickling of the workpieces - according to stage b) - preferably takes place in several rinsing stages, whereby it is particularly advantageous to direct the rinsing water in a cascade-like manner in the opposite direction to the workpiece.
• the last rinsing stage should be carried out with fully demineralized water.
• the treatment following the pickling and rinsing stage according to stage c) prevents the renewed growth of an oxide layer on the workpieces with a surface made of aluminum or aluminum alloy.
• the solution used in step c) additionally contains at least one polymer selected from the group consisting of poly(meth)acrylic acid, (meth)acrylic acid copolymers, polyvinylphosphonic acid, vinylphosphonic acid copolymers and maleic acid copolymers.
• Preferred (meth)acrylic acid-maleic acid copolymers are used as (meth)acrylic acid copolymers and preferred vinylphosphonic acid-acrylic acid copolymers are vinylphosphonic acid-acrylic acid copolymers.
• Polyacrylic acid and acrylic acid copolymers are particularly suitable as polymers, and in the latter case, acrylic acid-maleic acid copolymers are particularly suitable.
• the poly(meth)acrylic acid used preferably has a number-average molecular weight (MW) in the range from 4,000 to 300,000 g/mol, particularly preferably from 50,000 to 250,000 g/mol and very particularly preferably from 100,000 up to 250,000 g/mol.
• MW number-average molecular weight
• the (meth)acrylic acid copolymer used preferably has a number average molecular weight (MW) in the range from 4,000 to 100,000 g/mol and particularly preferably from 60,000 to 80,000 g/mol.
• MW number average molecular weight
• the polyvinylphosphonic acid or vinylphosphonic acid copolymer used preferably has a number-average molecular weight (MW) in the range from 4,000 to 70,000 g/mol and particularly preferably in the range from 10,000 to 30,000 g/mol.
• MW number-average molecular weight
• the concentration of the at least one polymer is between 100 and 600 mg/l, preferably between 100 and 400 mg/l, particularly preferably between 135 and 290 mg/l and very particularly preferably between 170 and 180 mg/l.
• a layer weight of Zr and Mo that is more independent of the spraying time preferably largely independent of it, can be achieved in the target range of 2 to 15 mg/m 2 in each case. This is particularly advantageous because it allows similar layer weights to be achieved even at different belt speeds. However, no negative effects on the volume resistance can be observed due to the polymer content.
• a further advantageous embodiment of the invention provides for a lubricant to be applied to the workpieces.
• a lubricant to be applied to the workpieces.
• the permanent anti-corrosive treatment Before the permanent anti-corrosive treatment, it is usually advisable to carry out cleaning and water rinsing steps. If a primer or paint application is planned, it is advisable to dry it beforehand. If a chrome-free conversion treatment is to follow, the application can be carried out wet-on-wet, i.e. without prior drying, when dipping or spraying. When applying using the roll coater method, Intermediate drying is essential. In the case of a subsequent phosphating treatment, which can also be carried out wet-on-wet, it is advisable to provide an activation treatment, for example with an activating agent containing titanium and phosphate.
• workpieces are regularly obtained with layers that allow perfect forming and/or bonding or, due to the low and uniform electrical resistance across the workpiece surface, perfect and problem-free welding.
• the workpieces are ideally suited for subsequent permanent corrosion protection treatment.
• sheets made of aluminum alloys of quality AA 6111 and AA 5754 were first pickled to remove grease at a temperature of 50 °C by immersion or spraying.
• the pickling solution contained 6 g/l sulfuric acid (100%), 100 mg/l hydrofluoric acid (100%) and 2 g/l non-ionic surfactant consisting of ethoxylated fatty alcohol and ethoxylated abietic acid in a weight ratio of 1:1.
• the pickling process was carried out in such a way that the pickling removal was 0.05 to 0.2 g/m 2 for the AA 5754 alloy and 0.05 to 0.4 g/m 2 for the AA 6111 alloy. This required treatment times of between 5 and 20 seconds.
• the workpieces were then thoroughly rinsed with water, and in the last step with demineralized water.
• the volume resistances measured on the individual sheets were approximately 60 ⁇ -Ohm for the AA 5754 alloy and approximately 13 ⁇ -Ohm for the AA 6111 alloy.
• Column 3 of Table 2 also shows the volume resistances obtained from individual sheet measurements in ⁇ -Ohm.
• the volume resistances were measured immediately after drying/drying (first row "0 d” in each case) and after storage for 30 days (second row "30 d” in each case). They were carried out in accordance with leaflet 2929 (from September 2001) of the German Association for Welding and Related Processes (DSV) using copper electrodes with a diameter of 20 mm.
• DSV German Association for Welding and Related Processes
• a sequence of steps 1 to 3 represents a cycle by definition.
• a cycle was considered to have passed if the adhesive bond between all test plates in the chain held up.
• the test was considered to have passed overall if if at least 45 cycles have been passed.
• a “+” in Table 3 means a closed, fine-crystalline phosphate layer, an "o” a closed, coarsened phosphate layer (crystals with > 20 ⁇ m edge length) and a "-" a non-closed or non-existent phosphate layer.
• Comparative example VB1 shows that due to an excessive Zr coating weight of the layer obtained during treatment according to step c) (37 mg/m 2 for AA 5754 and 26 mg/m 2 for AA 6111), very high volume resistances are obtained - especially after storage for 30 days (100 ⁇ -Ohm for AA 5754 and 38 ⁇ -Ohm for AA 6111).
• the coating weights obtained are in the desired range, but due to the zirconium/molybdenum ratio in the treatment solution for process step c) of 20:1 (see VB4) and 2:1 (see VB5), the volume resistances obtained are not acceptable, especially for AA 6111 (26 and 44 ⁇ -Ohm for VB4 and 19 and 22 ⁇ -Ohm for VB5).
• Examples B1 to B7 show that when the conditions essential to the invention are observed with regard to the type of pickling treatment, the Zr/Mo ratio, the coating weight produced, the respective Concentration and pH ranges of the treatment solutions allow layers with extremely good volume resistances and at the same time good adhesive properties to be obtained.
• Example B7 is not according to the invention (See) Example Filament (mm) VDA-Temperature (mm) AA6111 AA5754 AA6111 AA5754 VB6 0.8 0.1 0.1 0.1 B6 0.8 0.1 0.1 0.1 B7 1.0 0.1 0.1 0.1 0.1
• the corrosion protection for B6 and B7 is comparable to that for VB6 .
• the pretreatment according to the invention therefore has no adverse effect on the protection subsequently achieved by a corrosion-protective treatment.

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• 2016
  • 2016-09-14 CA CA2996465A patent/CA2996465A1/en active Pending
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  • 2016-09-14 DE DE102016217507.6A patent/DE102016217507A1/de not_active Withdrawn
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