US20230357946A1 - Method of manufacturing an interference coating - Google Patents

Method of manufacturing an interference coating Download PDF

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Publication number
US20230357946A1
US20230357946A1 US18/018,570 US202118018570A US2023357946A1 US 20230357946 A1 US20230357946 A1 US 20230357946A1 US 202118018570 A US202118018570 A US 202118018570A US 2023357946 A1 US2023357946 A1 US 2023357946A1
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Prior art keywords
dyeing
anodizing
aluminum
conducted
product
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US18/018,570
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Dawid Wodka
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Canpack SA
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Canpack SA
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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
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/20—Electrolytic after-treatment
    • C25D11/22—Electrolytic after-treatment for colouring layers
    • 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
    • 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
    • C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
    • 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
    • C25D11/14—Producing integrally coloured layers
    • 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
    • C25D11/18—After-treatment, e.g. pore-sealing
    • 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
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers

Definitions

  • the object of the present invention is a method of manufacturing an interference coating on the surface of an aluminum alloy or aluminum alloys product comprising anodizing and electrochemical dyeing with use of alternating current.
  • aluminum alloys Due to the favorable strength to specific weight ratio and the ease of forming, aluminum alloys have gained popularity in many manufacturing industries. Currently, aluminum alloys are widely used in the automotive, construction and food packaging industries. Because of the conditions in which the products operate it is necessary to additionally protect the metal surface against adverse external factors. For some industries, the visual effect is a key factor in the customer's decision to purchase a given product. The growing awareness of the need for sustainable development poses new challenges for engineers working on the development of new coatings. Currently, the market requires meeting all three of the above-mentioned aspects, the coating must meet certain technical requirements, be environment friendly and offer unprecedented visual effects.
  • the protection of the aluminum surface can be achieved by anodizing process.
  • the process itself is well known and described in the available literature.
  • Dyeing process without preceding anodizing step is described in the document U.S. Pat. No. 4,115,212.
  • the document discloses electrochemical dyeing process of aluminum alloy objects using an alternating current in an aqueous bath consisting of sulfuric acid and boric acid or only sulfamic acid and salts of metals. The process ends with additional protection of the surface by applying a colorless varnish. The layer, however, has no interference effect.
  • the document WO2019011778 describes a method of manufacturing an iridescent coating on rolled products.
  • Anodized thin, porous aluminum oxide layer with a thickness of 15 to 25 nm is dyed with azo, anthraquinone or indigo dyes. This process is completed with a coating obtained by a sol-gel method.
  • the layer obtained in this way is characterized by a slight iridescent effect.
  • a method of manufacturing an interference coating on the surface of an aluminum alloy or aluminum alloys product comprising anodizing and electrochemical dyeing with use of alternating current according to the present invention is characterized in that, the electrolyte used during electrochemical dyeing comprises copper (II) sulfate (VI) in an amount from 1 to 100 g/L, boric acid in the amount of 1 to 40 g/L and tartaric acid in the amount of 0.1 g to 20 g/L.
  • the electrolyte used during electrochemical dyeing comprises copper (II) sulfate (VI) in an amount from 1 to 100 g/L, boric acid in the amount of 1 to 40 g/L and tartaric acid in the amount of 0.1 g to 20 g/L.
  • Dyeing is conducted under continuous stirring of electrolyte.
  • Time of dyeing is longer than 10 seconds.
  • Dyeing is conducted at a temperature 5-40° C.
  • Dyeing is conducted with use of alternating current having voltage in range 0.5-50 V.
  • Anodizing is conducted in the solution of sulfuric acid (VI) having concentration of 50-500 g/L with the addition of aluminum ions in the amount of 0-100 g/L.
  • Anodizing is conducted at a current density of 0.1-5 A/dm 2 .
  • Anodizing is conducted for 10-3600 seconds.
  • the product is sealed after dyeing.
  • Sealing is conducted by hot or cold hydrothermal or vapor deposition methods.
  • Sealing is conducted by vapor deposition method using atomic layer deposition.
  • the surface of the aluminum product should be degreased and etched before starting anodizing. This process can take place in baths based on organic solvents, acidic and alkaline water baths. After washing and etching the workpiece, rinse it with deionized water. After excess water has drained off, the aluminum product can be subjected to the process of manufacturing an interference coating.
  • the above-described method of preparing the surface of the product can be replaced by another known method. Other alternative methods are available in the state of the art that can ensure adequate surface quality.
  • the product After anodizing, the product should be rinsed, preferably in deionized water, and then transferred to the dyeing bath.
  • the unquestionable advantage of the method of obtaining the interference coating according to the invention is appropriate selection of the electrolyte components.
  • Use of copper (II) sulfate (VI) is much safer in comparison to the previously used electrolytes, e.g. cobalt sulfate (VI) or nickel sulfate (VI), which are suspected of and/or show carcinogenic properties.
  • the composition of the electrolyte allows to obtain wide range of color variants in one bath, thus facilitating the technological process, also shortening the time of creating the coating, which is an important economic aspect and is beneficial for the natural environment as it reduces energy consumption.
  • the method according to the invention may in particular be useful for obtaining a new graphic effect on the surface of beverage cans or their lids.
  • FIG. 1 illustrates a block diagram of the interference coatings manufacturing process
  • FIG. 2 cross-section of the aluminum product showing the structure of the coating with light interference.
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 150 g/L with the addition of aluminum ions at the level of 1.1 g/L at a temperature of 18° C., under direct current conditions with a current density of 1.1 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 200 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 8 V in an electrolyte containing 15 g/L of copper (II) sulfate (VI), 20 g/L of boric acid and 1 g/L of tartaric acid. During the whole process, the electrolyte temperature is 18° C. A stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product. The electrolyte is constantly stirred and the dyeing time is 120 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • FIG. 1 The block diagram of the interference coating manufacturing process is shown in FIG. 1 , where the numbers represent
  • the dashed line indicates the optional sealing path for the coating of the aluminum product.
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 145 g/L with the addition of aluminum ions at the level of 1 g/L at a temperature of 11° C., under direct current conditions with a current density of 1.2 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 250 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 12 V in an electrolyte containing 13 g/L of copper (II) sulfate (VI), 22 g/L of boric acid and 1.6 g/L of tartaric acid. During the whole process, the electrolyte temperature is 22° C. A stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product. The electrolyte is constantly stirred and the dyeing time is 160 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • the block diagram of the interference coating manufacturing process is shown in FIG. 1 .
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 150 g/L with the addition of aluminum ions at the level of 1.1 g/L at a temperature of 18° C., under direct current conditions with a current density of 1.1 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 200 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 8 V in an electrolyte containing 15 g/L of copper (II) sulfate (VI), 22 g/L of boric acid and 1.6 g/L of tartaric acid. During the whole process, the electrolyte temperature is 18° C. A stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product. The electrolyte is constantly stirred and the dyeing time is 120 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • the block diagram of the interference coating manufacturing process is shown in FIG. 1 .
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 120 g/l with the addition of aluminum ions at the level of 1 g/L at a temperature of 18° C., under direct current conditions with a current density of 1.1 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 200 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 8 V in an electrolyte containing 15 g/L of copper (II) sulfate (VI), 20 g/L of boric acid and 1 g/L of tartaric acid.
  • the electrolyte temperature is 18° C.
  • a stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product.
  • the electrolyte is constantly stirred and the dyeing time is 120 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • the block diagram of the interference coating manufacturing process is shown in FIG. 1 .
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 150 g/L with the addition of aluminum ions at the level of 1 g/L at a temperature of 20° C., under direct current conditions with a current density of 1.1 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 200 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 8 V in an electrolyte containing 15 g/L of copper (II) sulfate (VI), 20 g/L of boric acid and 1 g/L of tartaric acid. During the whole process, the electrolyte temperature is 22° C. A stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product. The electrolyte is constantly stirred and the dyeing time is 120 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • the block diagram of the interference coating manufacturing process is shown in FIG. 1 .
  • the aluminum product After degreasing and etching the surface, the aluminum product is anodized in an aqueous solution of sulfuric acid (VI) having concentration of 120 g/l with the addition of aluminum ions at the level of 1 g/L at a temperature of 21° C., under direct current conditions with a current density of 1.1 A/dm 2 .
  • VI sulfuric acid
  • An aluminum sheet with a surface equal to or greater than that of the aluminum product may be used as the cathode.
  • the anodizing time was 250 seconds. After completing the anodizing process, the product should be rinsed in deionized water, and after draining off the excess, next step can be started.
  • Electrochemical dyeing is performed using an alternating current of 8 V in an electrolyte containing 15 g/L of copper (II) sulfate (VI), 20 g/L of boric acid and 1 g/L of tartaric acid. During the whole process, the electrolyte temperature is 25° C. A stainless steel counter electrode has a working surface equal to or greater than that of the aluminum product. The electrolyte is constantly stirred and the dyeing time is 100 seconds. After the end of the process, the aluminum product is rinsed in deionized water and then dried.
  • the block diagram of the interference coating manufacturing process is shown in FIG. 1 .
  • FIG. 2 shows a cross-section of such a product showing the structure of a coating in which light interference occurs, where the individual numbers represent:

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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)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Coloring (AREA)
US18/018,570 2020-07-29 2021-06-25 Method of manufacturing an interference coating Pending US20230357946A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PLP.434839 2020-07-29
PL434839A PL241203B1 (pl) 2020-07-29 2020-07-29 Sposób wytwarzania powłoki interferencyjnej
PCT/IB2021/055654 WO2022023836A1 (fr) 2020-07-29 2021-06-25 Procédé de fabrication d'un revêtement d'interférence

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US (1) US20230357946A1 (fr)
EP (1) EP4189147A1 (fr)
CN (1) CN115803483A (fr)
CA (1) CA3183777A1 (fr)
CO (1) CO2023001764A2 (fr)
PL (1) PL241203B1 (fr)
WO (1) WO2022023836A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406591A (en) * 1973-02-21 1975-09-17 Iongraf Sa Process for colouring by electro-deposition an anodized aluminium or aluminium alloy article
JP2013253317A (ja) * 2012-05-08 2013-12-19 Fujifilm Corp 半導体装置用基板、半導体装置、調光型照明装置、自己発光表示装置、太陽電池および反射型液晶表示装置
CN105386111B (zh) * 2015-11-05 2018-07-13 深圳市鑫鸿达清洗技术有限公司 一种铝合金电解着色中国红的方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4034854C2 (de) * 1989-11-08 2000-08-17 Clariant Finance Bvi Ltd Verfahren zum elektrolytischen Färben von Aluminium und Aluminiumlegierungen
GB2509335A (en) * 2012-12-31 2014-07-02 Univ Tartu Double-structured corrosion resistant coatings and methods of application

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406591A (en) * 1973-02-21 1975-09-17 Iongraf Sa Process for colouring by electro-deposition an anodized aluminium or aluminium alloy article
JP2013253317A (ja) * 2012-05-08 2013-12-19 Fujifilm Corp 半導体装置用基板、半導体装置、調光型照明装置、自己発光表示装置、太陽電池および反射型液晶表示装置
CN105386111B (zh) * 2015-11-05 2018-07-13 深圳市鑫鸿达清洗技术有限公司 一种铝合金电解着色中国红的方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
machine translation of Guo et al. CN 105386111 B (Year: 2018) *
machine translation of Kaito et al. JP 2013253317 A (Year: 2013) *

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CO2023001764A2 (es) 2023-03-07
CA3183777A1 (fr) 2022-02-03
PL241203B1 (pl) 2022-08-22
CN115803483A (zh) 2023-03-14
EP4189147A1 (fr) 2023-06-07
PL434839A1 (pl) 2022-01-31
WO2022023836A1 (fr) 2022-02-03

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