Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
  • C21D8/0226—Hot rolling
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
  • C21D8/0236—Cold rolling
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
  • C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
  • C21D8/0273—Final recrystallisation annealing
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

• Aluminium is, in this perspective, a material of first choice for high quality packaging due to its excellent formability and the possibility to create a wide range of surface aspects by applying adapted surface treatments such as etching and anodizing. These surface finishes range from bright towards matt and in combination with anodization it opens possibilities for colouring such as for example creating a gold shiny look. Many customers demand matt, and semi-matt or satin surface finish with different shades of“mattness”. This can be obtained by combination of chemical or electro-chemical polishing and etching before anodizing.
• Alkaline (e.g. caustic soda) etching is the most common and important pretreatment stage for anodized aluminium sheet and extrusions, particularly in architectural and decorative applications.
• the aim is to produce a finely etched surface with a satin-matt visual aspect as a result of the high proportion of diffuse light reflectance.
• Various surface aspects may be obtained as a function of metal composition, anodizing pretreatment and anodizing process.
• the patent FR 2,041,635 describes a process for coloring aluminium bright or matt surfaces.
• the patent application CN 108118201 discloses a 3005 aluminum alloy base material for a trimming plate of sedan body pillars.
• the aluminum alloy base material comprises the following chemical ingredient by mass percentage:0.05-0.20% of Si, 0.40-0.60% of Fe, 0.05-0.10% of Cu, 1.00-1.30% of Mn, 0.20-0.50% of Mg, 0.05% of Cr, 0.05% of Zn, 0.004% of Na, 0.05-0.15% of other impurities and the balance of Al.
• An object of the invention was to provide a rolled aluminum-based alloy product for cosmetic packaging comprising, in weight % : Mn 1.0 - 1.5,
• Yet another object of the invention is the use of a rolled product according to the invention for cosmetic packaging, preferably for containers such as bottles, cups, tubes, holders, with a matt surface aspect.
• Figure 1 shows the microstructure of the products of example 1 in the L-LT plane la : example A-l, lb : example A-2, lc : example B-l.
• a minimum Fe content of 0.1 and preferably 0.2 or even 0.30 is needed to obtain a homogenous matt surface aspect after anodizing.
• the Fe content should not exceed 0.7 and preferably 0.65 or even preferably 0.60 to obtain the sought balance of properties in particular homogeneous matt surface aspect after surface treatment, strength and formability.
• the desired fraction of Al(Fe,Mn)Si results from the combination of the product composition, particularly the Fe and Si content, with the manufacturing process.
• the surface fraction of Al(Fe,Mn) is less than 1.5%, preferentially less than 1%, the surface fraction of Al(Fe,Mn), being obtained from the ratio of the surface of Al(Fe,Mn) particles to the total analyzed surface.
• the surface fraction of Al(Fe,Mn) particles For the measurements of particles surface fractions, all particles having an equivalent diameter of larger than 0.61pm are considered.
• the Cu content should not exceed 0.3 and preferably it should not exceed 0.2.
• a minimum Cu content of 0.05, preferably of 0.08, more preferably 0.09 and even more preferably of 0.10 is used to obtain good chemical response to surface treatment.
• Chromium is preferentially avoided and is kept below 0.1, preferentially below about
• a suitable process for producing rolled products according to the present invention comprises: (a) casting an ingot made in an alloy according to the invention, (b) homogenizing the ingot at a temperature of at least 480 °C (c) hot rolling said homogenized ingot to a hot-rolled intermediate product ; (d) cold rolling said hot-rolled intermediate product to a cold-rolled intermediate product; (e) recrystallization annealing of the cold-rolled intermediate product; (f) cold rolling the annealed cold-rolled intermediate product to a cold rolled product at final thickness; (g) recovery annealing the cold-rolled product at final thickness.
• a recrystallization annealing of the cold-rolled intermediate product is then carried out.
• the temperature of the recrystallization annealing should be sufficient to ensure full recrystallization of the cold-rolled intermediate product.
• the temperature of the recrystallization is typically at least 300 °C or at least 320 °C.
• the temperature should usually not be above 380 °C, however conditions may differ if the recrystallization annealing is carried in a batch furnace or in a continuous annealing line.
• the annealed cold-rolled intermediate product is then cold-rolled to its final thickness, which is typically between 0.2 and 1 mm, preferably between 0.4 and 0.8 mm.
• a recovery annealing of the cold-rolled product at final thickness is finally carried out in order to obtain the required balance between strength and formability.
• the temperature of the recovery annealing or partial annealing is selected so that strength is reduced to the desired level.
• the recovery annealing temperature is between 200 °C and 350 °C or preferentially between 240 °C and 300 °C, however conditions may differ if the recrystallization annealing is carried in a batch furnace or in a continuous annealing line. For recrystallization and recovery annealing a batch furnace is usually preferred.
• the rolled product of the invention has a fine grain microstructure with a grain size in the longitudinal (L) and longitudinal transverse (LT) directions of less than 75 pm and preferably less than 65 pm with an aspect ratio less than 2.0 and preferably less than 1.8. Grain size is measured according the intercept method according to standard ASTM El 12.
• the mechanical properties of the product of the invention are favorable for cosmetic packaging having a good balance between formability and strength.
• the tensile yield strength TYS in the LT direction is at least 155 MPa preferentially at least 160 MPa
• the ultimate tensile strength UTS in the LT direction is at least 185 MPa and preferentially at least 190 MPa
• the elongation A50 is at least 5% and preferentially at least 6% and the earing is less than 4.3% and preferentially less than 4.0%.
• the products according to the invention respond to surface treatment such as alkaline etching and anodizing by the formation of a homogenous matt surface aspect.
• surface treatment such as alkaline etching and anodizing by the formation of a homogenous matt surface aspect.
• the products of the invention are free of surface defects such as looper lines or anodizing bands.
• the surface of the products of the invention are rated 0 or 1, preferably 0.
• the rolled product of the invention can be used for cosmetic packaging, typically for containers such as bottles, cups, tubes, holders, particularly with a matt surface aspect.
• the process to transform a rolled product of the invention to a package for cosmetics comprises
• a preferred surface treatment comprises an alkaline etching step at a temperature of at least 50 °C and a sulfuric acid anodizing step at a temperature of at least 15 °C.
• compositions Two ingots were cast, one of a product with a composition according to the invention (A), and one reference example (B).
• the compositions are provided in Table 1 : Table 1 : composition (wt. %) of a cast according to the invention and a reference cast.
• the ingots were then scalped and homogenized at 620 °C for 17 hours.
• the ingots were hot rolled to a thickness of about 7 mm.
• Hot rolling entry temperature was higher than 450 °C and hot rolling exit temperature was higher than 390 °C.
• the hot rolled products were further cold rolled to a thickness of 1 mm.
• An intermediate recrystallization annealing was then carried out at 340 °C.
• the intermediate annealed recrystallized products were cold rolled again to a final thickness of 0.5 mm or 0.6 mm.
• a final recovery annealing was carried out in a batch furnace at 250 °C for alloy A and 285 °C for alloy B.
• the samples were mechanically tested, in LT direction to determine their static mechanical properties. Tensile yield strength, ultimate strength and elongation at fracture are provided in Table 2. Earing was also characterized according to EN 1669.
• microstructure of the finished sheets made were characterized by optical microscopy after anodic oxidation, on surface and (L-LT plane) and cross-section (L-ST section). The results are presented in Figures 1 and 2.
• the fraction of Al(Fe,Mn)Si phase which is defined as the 2D surface of all identified quaternary particles in a sample (Surface of Al(Fe,Mn)Si particles in Table 4), divided by the total 2D surface of all detected particles (Total particle surface in Table 4) was 69.1 % for A-l and 43.9 % for B-l.
• the surface fraction of Al(Fe,Mn), which is obtained from the ratio of the surface of Al(Fe,Mn) particles to the total analyzed surface was 0.85% for A-l and 2.33% for B-l.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Metal Rolling (AREA)

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Citations (5)

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• 2019
  • 2019-05-24 EP EP19176532.0A patent/EP3741875A1/en not_active Withdrawn
• 2020
  • 2020-02-26 US US17/613,432 patent/US20220307112A1/en active Pending
  • 2020-02-26 EP EP20706287.8A patent/EP3976845A1/en active Pending
  • 2020-02-26 WO PCT/EP2020/055039 patent/WO2020239276A1/en unknown
  • 2020-02-26 CN CN202080038362.3A patent/CN113874535B/zh active Active

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