Abstract:
The invention relates to a method for electrolytically coating metalswith zinc or a zinc alloy. Matt surfaces are obtained by depositing zinc from an electrolyte solution containing a zinc salt selected from zinc sulphate or an alkane sulphate of zinc or mixtures thereof and optionally other metal salts, an acid selected from sulphuric acid or an alkane sulphonic acid or a mixture of both acids and at least one additive for improving surface roughness and for avoiding dendritic edge growth, selected from surface active compounds containing nitrogen which can be ionic or non-ionic, anionic surface active compounds containing nitrogen, and surface active compounds derived from multi-fuctional alcohols with at least three hydroxy groups. The invention also relates to an electrolytic composition for an electrolytically coating of metals with zinc or zinc alloys, in addition to the use of the above-mentioned additives for improving surface roughness and avoiding dentritic edge growth when metals are electrolytically coated with zinc or a zinc alloy in an electrolyte containing alkane sulphonic acid.
Abstract:
Process for the passivation of metallic surfaces by treatment of the surface with an acidic, aqueous preparation which comprises at least one water-soluble acid group-containing polymer and Zn, Ca, Mg or Al ions, said process being in particular a continuous process for the passivation of strip metals.
Abstract:
processo para a passivação de superfícies metálicas, e, camada de passivação sobre uma superfície metálica. a invenção refere-se a um método para a passivação de superfícies metálicas pelo tratamento da superfície com uma composição aquosa ácida, contendo pelo menos um grupo ácido solúvel em água compreendendo polímero e íons de zn, ca, mg, ou al, o citado método sendo particularmente um método contínuo para a passivação de metais em tira.
Abstract:
Procedimiento para el revestimiento electrolítico de metales con cinc o una aleación de cinc a una densidad de corriente de 10 a 400 A/dm2, obteniéndose superficies lisas, mediante precipitación de cinc a partir de una disolución de electrólito que contiene una sal de cinc, seleccionada a partir de sulfato de cinc o un alcanosulfonato de cinc, o mezclas de los mismos, y en caso dado otras sales metálicas, un ácido seleccionado a partir de ácido sulfúrico o ácido alcanosulfónico, o una mezcla de ambos ácidos y al menos un aditivo para la mejora de la rugosidad superficial, y supresión del crecimiento de cantos dendrítico, seleccionados a partir de polietileniminas, productos de reacción de aminas con epiclorhidrina, sulfatos de alquilo con al menos 5 átomos de carbono, sulfonatos e isetionatos.
Abstract:
La invencion se refiere a un metodo para la pasivacion de superficies metalicas a traves del tratamiento de la superficie con una composicion acuosa acida, que comprende por lo menos un polimero que contiene grupo acido soluble en agua y iones Zn, Ca, Mg o Al, el metodo que es particularmente un metodo continuo para la pasivacion de metales en tira.
Abstract:
The invention relates to a process for the electrolytic coating of metals with zinc or a zinc alloy in which matt surfaces are obtained, by deposition of zinc from an electrolyte solution comprising a zinc salt selected from zinc sulfate or an alkanesulfonate of zinc or mixtures thereof, and, if desired, further metal salts, an acid selected from sulfuric acid or an alkanesulfonic acid or a mixture of the two acids, and at least one additive for improving the surface roughness and preventing dendritic edge growth, selected from nitrogen-containing surface-active compounds, which may be ionic or nonionic, sulfur-containing anionic surface-active compounds, and surface-active compounds based on multifunctional alcohols having at least three hydroxyl groups. The invention furthermore relates to an electrolyte composition for electrolytic coating of metals with zinc or zinc alloys, and to the use of said additives for improving the surface roughness and preventing dendritic edge growth in the electrolytic coating of metals with zinc or a zinc alloy in an alkanesulfonic acid-containing electrolyte.
Abstract:
The invention relates to a process for the electrolytic coating of metals with zinc or a zinc alloy in which matt surfaces are obtained, by deposition of zinc from an electrolyte solution comprising a zinc salt selected from zinc sulfate or an alkanesulfonate of zinc or mixtures thereof, and, if desired, further metal salts, an acid selected from sulfuric acid or an alkanesulfonic acid or a mixture of the two acids, and at least one additive for improving the surface roughness and preventing dendritic edge growth, selected from nitrogen-containing surface-active compounds, which may be ionic or nonionic, sulfur-containing anionic surface-active compounds, and surface-active compounds based on multifunctional alcohols having at least three hydroxyl groups. The invention furthermore relates to an electrolyte composition for electrolytic coating of metals with zinc or zinc alloys, and to the use of said additives for improving the surface roughness and preventing dendritic edge growth in the electrolytic coating of metals with zinc or a zinc alloy in an alkanesulfonic acid-containing electrolyte.
Abstract:
The invention relates to a method for passivation of metal surfaces by treatment of the surface with an acid aqueous composition, containing at least one water-soluble acid-group comprising polymer and Zn, Ca, Mg, or Al ions, said method being particularly a continuous method for the passivation of strip metals.
Abstract:
Process for the passivation of metallic surfaces by treatment of the surface with an acidic, aqueous preparation which comprises at least one water-soluble acid group-containing polymer and Zn, Ca, Mg or Al ions, said process being in particular a continuous process for the passivation of strip metals.
Abstract:
The invention relates to a process for the electrolytic coating of metals with zinc or a zinc alloy in which matt surfaces are obtained, by deposition of zinc from an electrolyte solution comprising a zinc salt selected from zinc sulfate or an alkanesulfonate of zinc or mixtures thereof, and, if desired, further metal salts, an acid selected from sulfuric acid or an alkanesulfonic acid or a mixture of the two acids, and at least one additive for improving the surface roughness and preventing dendritic edge growth, selected from nitrogen-containing surface-active compounds, which may be ionic or nonionic, sulfur-containing anionic surface-active compounds, and surface-active compounds based on multifunctional alcohols having at least three hydroxyl groups. The invention furthermore relates to an electrolyte composition for electrolytic coating of metals with zinc or zinc alloys, and to the use of said additives for improving the surface roughness and preventing dendritic edge growth in the electrolytic coating of metals with zinc or a zinc alloy in an alkanesulfonic acid-containing electrolyte.