RU2015123743A

RU2015123743A - CHROMIUM-CHROMIDE OXIDE COATINGS APPLIED TO STEEL SUBSTRATES FOR PACKAGING APPLICATIONS AND METHOD FOR PRODUCING SUCH COATINGS

Info

Publication number: RU2015123743A
Application number: RU2015123743A
Authority: RU
Inventors: Жак Хюберт Ольга Йозеф ВЕЙЕНБЕРГ; Михил Стег; Ян Пауль Пеннинг; ЗВАРТ Илья ПОРТЕГИС
Original assignee: Тата Стил Эймейден Б.В.
Priority date: 2012-11-21
Filing date: 2013-11-21
Publication date: 2017-01-10
Also published as: CA2891605A1; WO2014079910A1; ES2716565T3; BR112015011731A2; CA2891605C; JP6407880B2; EP2922984A1; RS58266B1; RU2015124017A; RS58504B1; CA2892114C; BR112015011465B1; ZA201503508B; US20150337448A1; EP2922984B1; JP2016505708A; US20150329981A1; WO2014079911A2; BR112015011731A8; JP6407879B2

Claims

1. A method of producing a coated steel substrate for packaging applications by depositing a metallic chromium-chromium oxide coating on a substrate for packaging applications, comprising:

1. traditional non-passivated electrolytic, optionally fused, tinplate or

2. cold-rolled and re-annealed electrolytic, optionally fused, tinplate,

comprising electrolytic deposition on said substrate of said coating metal chromium-chromium oxide in a single process step from an electrolyte containing a mixture of a trivalent chromium compound, a chelating agent, an optional salt-increasing conductivity, an optional depolarizer, an optional surfactant, to which an acid or base is optionally added to adjust the pH, the electrolyte does not contain a buffer substance, and at the same time a sufficiently high cathode current density is supplied for REPRESENTATIONS chromium metal.

2. The method according to claim 1, wherein the chelating agent contains an anion of formic acid, the salt increasing the conductivity contains an alkali metal cation, and the depolarizer contains a bromide-containing salt.

3. The method according to any one of paragraphs. 1 or 2, while the cation in the chelating agent, which increases the conductivity of the salt and the depolarizer is potassium.

4. The method according to any one of paragraphs. 1 or 2, wherein the coated substrate is additionally provided on one or both sides with an organic coating consisting of a thermosetting organic coating at the varnishing stage, or with a thermoplastic single-layer or thermoplastic multilayer polymer at the stage of pressing the film or the stage of direct extrusion, preferably with a thermoplastic polymer coating is a polymer coating system comprising one or more layers containing thermoplastics, such as polyesters or polyolefins, acrylic resins, oliamidy, polyvinyl chloride, fluorocarbon polymers, polycarbonates, styrene resins, ABS plastics, chlorinated polyethers, ionomers, functionalized urethane resins and polymers; and / or their copolymers; and or mixtures thereof.

5. The method according to any one of paragraphs. 1 or 2, wherein an anode is selected that reduces or eliminates the oxidation of Cr (III) ions to Cr (VI) ions during the electrodeposition step, such as a gas diffusion anode.

6. The method according to any one of paragraphs. 1 or 2, wherein the tin-coated backing for packaging applications is electrolytically pretreated to minimize the thickness of the tin oxide layer before coating one or both sides of the coating layer with metallic chromium chromium oxide.

7. The method according to claim 6, wherein the electrolytic pretreatment consists in immersing the tin-coated substrate in a sodium carbonate solution and applying a cathode current density.

8. The method according to p. 7, while the sodium carbonate solution consists of 2-5 g / l Na ₂ CO ₃ at a temperature of from 35 to 65 ° C, and wherein the cathode current density is from 0.5 to 2 A / dm ² served over a period of time from 0.5 to 5 seconds.

9. The method according to any one of paragraphs. 1 or 2, while electrolytic deposition of a layer of metal chromium oxide of chromium oxide on non-passivated tinplate with a total chromium content of at least 20 mg / m ² , preferably at least 40 mg / m ² , and more preferably at least 60 mg / m ² .

10. The method according to any one of paragraphs. 1 or 2, while electrolytic deposition of a layer of metallic chromium oxide of chromium oxide on non-passivated tinplate with a total chromium content of not more than 140 mg / m ² , preferably not more than 90 mg / m ² , and more preferably not more than 80 mg / m ² .

11. The method according to any one of paragraphs. 1 or 2, with electrolytic deposition, a layer of metallic chromium oxide of chromium is deposited on a cold-rolled and re-annealed electrolytic, optionally fused, tinplate with a total chromium content of at least 20 mg / m ² , preferably at least 40 mg / m ² , and most preferably at least 60 mg / m ² .

12. The method according to any one of paragraphs. 1 or 2, with electrolytic deposition, a layer of metallic chromium oxide of chromium is deposited on cold-rolled and re-annealed electrolytic, optionally fused, tinplate with a total chromium content of not more than 140 mg / m ² , preferably not more than 90 mg / m ² , and most preferably not more than 80 mg / m ² .

13. The method according to claim 11, wherein, during electrolytic deposition, a layer of metallic chromium chromium oxide is deposited on a cold rolled and re-annealed electrolytic, optionally fused, tinplate with a total chromium content of not more than 140 mg / m ² , preferably not more than 90 mg / m ² , and most preferably not more than 80 mg / m ² .