non cyanide dimethylhydantoin silver complex

non cyanide dimethylhydantoin silver complex

  • NON-CYANIDE SILVER PLATING BATH COMPOSITION - Morrissey ...

    The final solution pH was approximately 11.0. A test panel was plated from this solution in a Hull cell at 0.5 ampere for 5 minutes at room temperature, with moving-vane agitation.

  • Cited by: 25
  • US20070151863A1 - Non-cyanide silver plating bath ...

    US20070151863A1 US11/563,332 US56333206A US2007151863A1 US 20070151863 A1 US20070151863 A1 US 20070151863A1 US 56333206 A US56333206 A US 56333206A US 2007151863 A1 US2007151863 A1 US 2007151863A1 Authority US United States Prior art keywords solution salts electroplating solution hydantoin substituted Prior art date 2004-02-24 Legal status (The

  • Cited by: 25
  • Non-cyanide silver plating bath composition - MORRISSEY ...

    2005-08-25  1. An electroplating solution for the deposition of silver; said solution comprising silver in the form of a complex of silver with hydantoin or a substituted hydantoin compound; said solution also comprising an excess of the hydantoin or substituted hydantoin compound, together with an effective quantity of a nonprecipitating electrolyte salt, and also an effective quantity of 2,2 ...

  • Complexing agent study for environmentally friendly silver ...

    * Corresponding authors a State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China E-mail: [email protected] Fax: +86-451-86418616

  • Cited by: 8
  • [PDF] Non-Cyanide Electrolytes for Gold Plating – A Review ...

    Nowadays, the cyanide and ferrous cyanide solutions are used in practice for gold plating. The traditional baths employed for soft gold as well as hard gold plating contain the cyanide complex, [Au(CN)2] , as the source of gold, which release free cyanide ions during the plating. Those compounds are very toxic, and formation and maintenance of cyanide baths is expensive and risky for technical ...

  • Non-cyanide silver plating baths - Finishing

    Non-cyanide silver plating baths? A discussion started in 1996 and continuing through 2014. Add your Q. or A. to restore it to the "Current Topics" discussions.

  • Highly Stable Gold(III) Complex with a Hydantoin Ligand in ...

    2005-08-26  A gold(III) complex with a monodentate 5,5-dimethylhydantoin (Hdmh) ligand, [Au(dmh)4]-, is square planar in geometry, stable in alkaline solutions because of soft acid−base interactions, and electrochemically reduced near −0.3 V vs Ag/AgCl to give a uniform and dense gold(0) film with a high current efficiency.

  • US20100044239A1 - Cyanide-free electrolyte composition ...

    The silver or silver alloy layers deposited from such an electrolyte composition by means of the method according to the invention are dull and ductile. The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing such layers with the help of said cyanide-free electrolyte composition. The ...

  • Complexing agent study via computational chemistry for ...

    * Corresponding authors a State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China E-mail: [email protected] Fax: +86-451-86418616

  • US Patent for Cyanide-free electrolyte composition and ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing silver or silver alloy layers with a cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic ...

  • Silver plating baths and silver plating method using the ...

    What is claimed is: 1. A silver electroplating bath consisting of at least one inorganic acid salt of silver used as a silver compound, at least one hydantoin compound of the following formula used as a complex-forming agent ##STR6## wherein R 1, R 3 and R 5 each independently represent hydrogen, an alkyl group having 1-5 carbon atoms, an aryl group or an alcohol, and

  • Electrodeposition of Gold from Non-cyanide Bath Using 5, 5 ...

    Electrodeposition of Gold from Non-cyanide Bath Using 5, 5 '-Dimethylhydantoin-gold Complex Article in Chinese Journal of Inorganic Chemistry 28(12):2617-2625

  • [PDF] Non-Cyanide Electrolytes for Gold Plating – A Review ...

    Nowadays, the cyanide and ferrous cyanide solutions are used in practice for gold plating. The traditional baths employed for soft gold as well as hard gold plating contain the cyanide complex, [Au(CN)2] , as the source of gold, which release free cyanide ions during the plating. Those compounds are very toxic, and formation and maintenance of cyanide baths is expensive and

  • Highly Stable Gold(III) Complex with a Hydantoin Ligand in ...

    2005-08-26  A novel gold(III) complex with a monodentate 5,5-dimethylhydantoin ligand, [Au(dmh)4]-, is square planar in geometry, inert and highly stable in alkaline solutions because of soft acid−base interactions, and electrochemically reduced near −0.3 V vs Ag/AgCl to give a gold(0) film with a high current efficiency.

  • Electrochemical behavior of gold (III) in cyanide-free ...

    The influence of composite additives, 2,2'-Bipyridine (BPY) and Potassium antimonyl tartrate (PAT), on the electrochemical behaviors of 5,5-dimethylhydantoin (DMH) based cyanide-free silver ...

  • US20100044239A1 - Cyanide-free electrolyte composition ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing such layers with the help of said cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a

  • Complexing agent study via computational chemistry for ...

    In this paper, we introduce a new environmentally friendly silver electroplating bath, employing 5,5-dimethylhydantoin (DMH) and nicotinic acid (NA) as complexing agents, based on the prediction of computational chemistry. An excellent silver electrodeposit with properties suitable for application in electronics packaging was obtained from the newly developed silver

  • US Patent for Cyanide-free electrolyte composition and ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing silver or silver alloy layers with a cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a

  • Complexation Behavior and Co-Electrodeposition Mechanism ...

    Alloy in Highly Stable Non-Cyanide Bath To cite this article: F. F. Huang and M. L. Huang 2018 J. Electrochem. Soc. 165 D152 View the article online for updates and enhancements. This content was downloaded from IP address 207.46.13.75 on 28/05/2020 at 00:09. D152 Journal of The Electrochemical Society, 165 (3) D152-D159 (2018) Complexation Behavior and Co

  • US Patent for Cyanide-free electrolyte composition, and ...

    Here, 1-methylhydantoin, 1,3-dimethylhydantoin, 5,5-dimethylhydantoin, 1-methanol-5,5-dimethylhydantoin or also 5,5-diphenylhydantoin can be employed for instance as complexing reagents. A deposition of mirror-shining silver and silver alloy layers from such electrolyte compositions is however not possible. But this is desired particularly in the field of decorative

  • Highly Stable Gold(III) Complex with a Hydantoin Ligand in ...

    2005-08-26  A novel gold(III) complex with a monodentate 5,5-dimethylhydantoin ligand, [Au(dmh)4]-, is square planar in geometry, inert and highly stable in alkaline solutions because of soft acid−base interactions, and electrochemically reduced near −0.3 V vs Ag/AgCl to give a gold(0) film with a high current efficiency.

  • Non-Cyanide Electrodeposited Ag–PTFE Composite Coating ...

    added to a non-cyanide succinimide silver complex bath. Direct or pulsed current method was used at a constant current density to enable comparison between both methods. A high incorporation rate of PTFE was successfully achieved, with pulsed current being highly useful in increasing the amount of PTFE in the composite coating. The study of coating wear under sliding showed that a large ...

  • A composite additive used for a new cyanide-free silver ...

    The influence of composite additives, 2,2′-bipyridine (BPY) and potassium antimonyl tartrate (PAT), on the electrochemical behavior of a 5,5-dimethylhydantoin (DMH)-based cyanide-free silver plating bath was investigated by experiments and quantum chemical calculations. The cathodic discharge process of the cyanide-free silver plating bath was studied by cyclic voltammetry (CV) and ...

  • Complexation Behavior and Co-Electrodeposition Mechanism ...

    Alloy in Highly Stable Non-Cyanide Bath To cite this article: F. F. Huang and M. L. Huang 2018 J. Electrochem. Soc. 165 D152 View the article online for updates and enhancements. This content was downloaded from IP address 207.46.13.75 on 28/05/2020 at 00:09. D152 Journal of The Electrochemical Society, 165 (3) D152-D159 (2018) Complexation Behavior and Co-Electrodeposition Mechanism of

  • Non-Cyanide Silver Plating - Shubhra Non-Cyanide Silver ...

    The Shubhra ™ non-cyanide silver electroplating process contains absolutely no cyanide in any form. As with the current cyanide-based silver electroplating processes, the SHUBHRA™ process operates at room temperature and the bath is alkaline, but with a milder pH value of 10.0.

  • US Patent for Cyanide-free electrolyte composition, and ...

    Here, 1-methylhydantoin, 1,3-dimethylhydantoin, 5,5-dimethylhydantoin, 1-methanol-5,5-dimethylhydantoin or also 5,5-diphenylhydantoin can be employed for instance as complexing reagents. A deposition of mirror-shining silver and silver alloy layers from such electrolyte compositions is however not possible. But this is desired particularly in the field of decorative surface coating. The WO ...

  • EP2089561A2 - Cyanide free electrolyte composition und ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing such layers with the help of said cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a wetting agent ...

  • US Patent for Cyanide-free electrolyte composition and ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing silver or silver alloy layers with a cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a wetting ...

  • US Patent Application for CYANIDE-FREE ELECTROLYTE ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing such layers with the help of said cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a wetting agent ...

  • Silver Plating of Copper or Copper Alloys - Advanced ...

    2020-05-05  Since most silver strike and silver plating baths are cyanide formulations; tellurium copper must first be underplated with a non-cyanide process such as nickel, acid copper or tin. Once underplated in this manner, the rest of the pretreatment process is the same as the standard method. Due to the need for an acid-based strike prior to silver plating, alternative machinable coppers such

  • Highly Stable Gold(III) Complex with a Hydantoin Ligand in ...

    A novel gold(III) complex with a monodentate 5,5-dimethylhydantoin ligand, [Au(dmh)4]-, is square planar in geometry, inert and highly stable in alkaline solutions because of soft acid−base interactions, and electrochemically reduced near −0.3 V vs Ag/AgCl to give a gold(0) film with a high current efficiency.

  • A composite additive used for a new cyanide-free silver ...

    The influence of composite additives, 2,2′-bipyridine (BPY) and potassium antimonyl tartrate (PAT), on the electrochemical behavior of a 5,5-dimethylhydantoin (DMH)-based cyanide-free silver plating bath was investigated by experiments and quantum chemical calculations. The cathodic discharge process of the cyanide-free silver plating bath was studied by cyclic voltammetry (CV) and ...

  • [PDF] Non-Cyanide Electrodeposited Ag–PTFE Composite ...

    FC-4:PTFE in various ratios were added to a non-cyanide succinimide silver complex bath. Direct or pulsed current method was used at a constant current density to enable comparison between both methods. A high incorporation rate of PTFE was

  • Modification of the SERS spectrum of cyanide traces due to ...

    2018-06-06  Regarding the SERS spectra recording of traces of cyanide in water, it has been found that using silver or gold SERS substrates will result in the creation of silver or gold complexes with cyanide [2, 10, 11]. It is well known that when silver or gold is added to the aqueous solution of an alkaline cyanide (e.g. NaCN or KCN), it reacts with the cyanide to form a soluble complex. This process ...

  • Pulse non-cyanide silver electroplating and anti-tarnish ...

    By Hull cell test, a kind of anion surfactant and nitrogen heterocyclic compound was chosen as a additive for pulse non-cyanide silver electroplating. And the process conditions of the silver plating and the pulse conditions were preliminarily ascertained. The pulse conditions and additive content were optimized by orthogonal test as follows: pulse width of 1 ms, positive duty cycle of 10% ...

  • Nanoscale characterization of thin immersion silver ...

    Non-cyanide complexing agents proposed to replace cyanide in silver plating baths [1]. Name of complexing agent Year of Citation or the related Patents Thiosulfate US Patents: 1978, 1994 Hydantion US Patents: 1997, 2007 Uracil 2009 . 2 Succinimide US Patents: 1978, 1981 Sulfite 2010 Ammonia 1996, 2004 Thiourea 1998, 1999 HEDTA 2007 2-hydroxypyridine 2009 5,5-dimethylhydantoin US Patent:

  • Silver cyanide AgCN - PubChem

    Silver cyanide AgCN or CAgN CID 10475 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. COVID-19 is an emerging, rapidly evolving situation. Get the latest public health information from CDC: https://coronavirus.gov. Get the latest research from NIH ...

  • Silver cyanide - Wikipedia

    Silver cyanide is the chemical compound with the formula AgCN. It is a white solid that precipitated upon treatment of solutions containing Ag + with cyanide, which is used in some schemes to recover silver from solution. Silver cyanide is used in silver-plating. Structure. Its structure consist of -[Ag-CN]- chains in which the linear two-coordinate Ag + ions are bridged by the cyanide ions ...

  • Cyclic Voltammetric Study of High Speed Silver ...

    The weak silver complex formed in cyanide-free silver plating solutions also increased the activity of free Ag ions which facilitates the displacement reactions between substrate and silver ions, releasing more metallic impurities into the plating solutions.

  • US Patent Application for CYANIDE-FREE ELECTROLYTE ...

    The invention relates to a cyanide-free electrolyte composition for depositing a silver or silver alloy layer on a substrate as well as a method for depositing such layers with the help of said cyanide-free electrolyte composition. The electrolyte composition according to the invention comprises at least one silver ion source, a sulfonic acid and/or a sulfonic acid derivative, a wetting agent ...