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:
The invention relates to the application of at least one ester of general formula (I) to (V), whereby R , R , R , R are the same or different and each, independent of one another, represent a linear or branched-chain C1 to C4 alkyl group, (-CH2-CH2-O)n-CH3 with n=1 to 3, a C3 to C6 cycloalkyl group, and an aromatic hydrocarbon group which can be substituted. At least one of the groups R , R , R or R represents (-CH2-CH2-O)n-CH3 with n=1 to 3. The inventive ester can be used as a solvent in electrolyte systems for Li ion accumulators.
Abstract:
The invention relates to a composition for treating the surfaces of metals and for depositing metals or metal alloys on plastic surfaces. Said composition contains: a) at least one polymer, as constituent A, containing at least one structural unit of formula (I), wherein said structural unit can be part of a polymer main chain or can be bound to a polymer main chain by means of an anchor group, and M is hydrogen or an ammonium cation or a metal cation; b) water or another solvent, as constituent B, which is suitable for dissolving, dispersing, suspending or emulsifying the polymer (constituent A); c) optionally surface-active compounds, dispersants, suspension agents and/or emulsifying agents as constituent C; and either d) optionally a salt, an acid or a base based on transition metal cations, transition metal oxoanions, fluorometallates or lantanoids as constituent D, and/or e) at least one acid selected from the group consisting of phosphoric acid, sulphuric acid, sulfonic acid, nitric acid, hydrofluoric acid and hydrochloric acid as constituent E, or a base, and/or f) at least one metal oxide and/or metal salt as constituent F. The invention also relates to a method for treating the surfaces of metals, and to a method for depositing metals or metal alloys on a metallic or plastic surface, wherein the metallic or plastic surface is brought into contact with a polymer (constituent A). The invention further relates to the use of polymers (constituent A) for treating the surfaces of metals and for depositing metals or metal alloys on a metallic or plastic surface.
Abstract:
Die Erfindung betrifft ein Verfahren zur Gewinnung goldfarbener Aluminiumoxid-Schichten, in dem das Färben der oxidierten Oberfläche des Aluminiums oder der Aluminium-Legierungen durch ein elektrolytisches Verfahren in einem eine Alkansulfonsäure und ein Alkansulfonat des Silbers enthaltenden Elektrolyten erfolgt, sowie die Verwendung der nach diesem Verfahren hergestellten goldfarben eingefärbten Werkstücke auf Basis von Aluminium oder Aluminium-Legierungen zu dekorativen Zwecken. Des weiteren betrifft die Erfindung eine Elektrolytlösung zur goldfarbenen Einfärbung der oxidierten Oberfläche von Aluminium oder Aluminium-Legierungen durch ein elektrolytisches Verfahren und die Verwendung von einem ein Alkansulfonat des Silbers enthaltenden Elektrolyten zur goldfarbenen Einfärbung von Aluminiumoxid-Schichten auf der Basis von Aluminium oder Aluminium-Legierungen in einem elektrolytischen Verfahren.
Abstract:
Un proceso para la remoción catalítica de gas de H2S de un flujo de gas ácido que comprende: a) R = CH3 (MGDA) ácido oxálico iminodiacetato b) R = H (NTA) (IDA); el proceso consiste en: a) reducir la cantidad de H2S en el flujo de gas ácido haciendo reaccionar el flujo de gas ácido con una solución acuosa que contiene un complejo quelato metálico en el cual se usa un ligando quelato de la fórmula general (I) en la cual: X es hidrógeno, un metal alcalino o NH4+, n es 1, 2 ó 3, y por lo menos uno de los grupos R1 a R6 es alquilo arilo, alquiloxi, ariloxi, carboxilo o hidroxilo; el resto de grupos es hidrógeno y el metal en el complejo quelato metálico es un metal polivalente que puede estar presente en más de un grado de oxidación; por lo menos una parte de metal, después de la reacción del flujo de gas ácido que contiene H2S, está presente en un grado de oxidación menor (forma reducida) que antes de la reacción; b) regenerar la mezcla obtenida en el paso a), que comprende azufre elemental yel complejo quelato metálico en el cual por lo menos una parte del metal está presente en forma reducida, con un agente oxidante, oxidándose la forma reducida del metal hasta el metal en su grado de oxidación original; y c) hacer recircular el complejo quelato de metal polivalente al paso a); el paso a) y b) se pueden efectuar en un único recipiente de reacción.
Abstract:
Procedimiento para la producción continua de disulfuros orgánicos, que comprende las siguientes etapas: (a) reacción de alcanoles con sulfuro de hidrógeno en un catalizador adecuado para dar una ¿corriente de mercaptano bruto¿ que contiene mercaptano, agua, sulfuro de hidrógeno, así como pequeñas cantidades de otros productos secundarios, como sulfuro orgánico y éter, (b) reacción de la ¿corriente de mercaptano bruto¿ con azufre disuelto en un disulfuro orgánico, con catálisis con una amina, que es líquida o sólida y presenta un punto de ebullición superior al punto de ebullición del disulfuro utilizado y una solubilidad en agua inferior a 0, 5 g/l, en una columna de reacción, de modo que los compuestos de bajo punto de ebullición producidos se recirculan a la etapa (a), (c) separación de fases de la mezcla obtenida en fase acuosa, que se esclusa hacia fuera y fase orgánica de azufre, (d) purificación mediante destilación de la fase orgánica de azufre, que contiene opcionalmente compuestosde bajo punto de ebullición, el disulfuro orgánico deseado, polisulfuros, amina y cantidades pequeñas de otros productos secundarios, de modo que se extrae el disulfuro orgánico, opcionalmente se recirculan los compuestos de bajo punto de ebullición producidos a la etapa (a) y se recirculan la amina y los polisulfuros producidos a la etapa (b), con adición de azufre y opcionalmente de amina, de modo que la separación de fases y el esclusado hacia afuera de la fase acuosa puede tener lugar en la etapa (c) a continuación de la etapa (a) o la etapa (b).
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:
A composition for the surface treatment of metals and for the deposition of metals or metal alloys and plastics surfaces comprises a) at least one polymer as component A, comprising at least one structural unit of the formula (I) where this structural unit may be part of a polymer main chain or may be bound to a polymer main chain via an anchor group, and M is hydrogen or an ammonium or metal cation; b) water or another solvent which is suitable for dissolving, dispersing, suspending or emulsifying the polymer (component A), as component B; c) if required, surface-active compounds, dispersants, suspending media and/or emulsifiers as component C; either d) if required, a salt, an acid or a base based on transition metal cations, transition metal oxoanions, fluorometallates or lanthanoids as component D, and/or e) at least one acid selected from the group consisting of phosphoric acid, sulfuric acid, sulfonic acid, nitric acid, hydrofluoric acid and hydrochloric acid as component E, or a base and/or f) at least one metal oxide and/or metal salt as component F. Furthermore, in a process for the surface treatment of metals and in a process for the deposition of metals or metal alloys on a metal surface or plastics surface, the metal surface or plastics surface is brought into contact with a polymer (component A). Moreover, polymers (component A) are used for the surface treatment of metals and for the deposition of metals or metal alloys on a metal surface or plastics surface.
Abstract:
The invention relates to a composition for treating the surfaces of metals a nd for depositing metals or metal alloys on plastic surfaces. Said composition contains: a) at least one polymer, as constituent A, containing at least one structural unit of formula (I), wherein said structural unit can be part of a polymer main chain or can be bound to a polymer main chain by means of an anchor group, and M is hydrogen or an ammonium cation or a metal cation; b) water or another solvent, as constituent B, which is suitable for dissolving , dispersing, suspending or emulsifying the polymer (constituent A); c) optionally surface-active compounds, dispersants, suspension agents and/or emulsifying agents as constituent C; and either d) optionally a salt, an aci d or a base based on transition metal cations, transition metal oxoanions, fluorometallates or lantanoids as constituent D, and/or e) at least one acid selected from the group consisting of phosphoric acid, sulphuric acid, sulfonic acid, nitric acid, hydrofluoric acid and hydrochloric acid as constituent E, or a base, and/or f) at least one metal oxide and/or metal sa lt as constituent F. The invention also relates to a method for treating the surfaces of metals, and to a method for depositing metals or metal alloys on a metallic or plastic surface, wherein the metallic or plastic surface is brought into contact with a polymer (constituent A). The invention further relates to the use of polymers (constituent A) for treating the surfaces of metals and for depositing metals or metal alloys on a metallic or plastic surface.