摘要:
For the electrolytic deposition of gold alloys there is required a process with which low carat coatings can be deposited which nevertheless have a high resistance to tarnish. Such coatings are obtained from electrolytes which consist of a salt melt and contain gold salts, alkali thiocyanate and salts of one or more alloyings elements as constituents. Preferably the electrolyte contains per liter of salt melt 0.5 to 20 grams of gold, up to 300 grams of Cu, Zn, Sn, Cd, Ni, Ag, Pd, Ru and/or Pt, up to 200 grams of alkali cyanide and/or water.
摘要:
Disclosed is a bath and process for obtaining deposits of gold or gold alloys of improved uniformity of deposit thickness on an irregularly shaped conductive surface. The aqueous plating bath contains gold as the aurocyanide complex, a mild reducing agent, a complexing agent, arsenic as a water-soluble arsenic compound, and a substituted polyamine.
摘要:
There is provided an electrolytic gold bath for the deposition of thicker, bright gold coatings at high rates of deposition. The bath contains a heterocyclic azohydrocarbon sulfonic acid or salt thereof, e.g. pyridine sulfonic acid.
摘要:
The specification relates to an improved electrolyte. The specification relates also to the use of this electrolyte to deposit gold on a surface. The electrolyte has an alkali gold cyanide, a weak Lewis acid, a weak polyfunctional water-soluble aliphatic acid, a non-depositing metallic compound, a metallic hardener, and water.
摘要:
A bright gold electroplating bath comprising: an aqueous solution of an alkali metal gold cyanide; as an alloying agent, cobalt or nickel, in the form of a complex with at least aminoguanidine and a chelating phosphonic acid; and as conducting and buffering agents, one or more bath soluble phosphates.
摘要:
AN AQUEOUS ELECTROLYTE SOLUTION HAVING A PH FROM 5.5 TO 8 FOR DEPOSITING HARD, DUCTILE AND BRIGHT ARSENIC CONTAINING GOLD HS BEEN PROVIDED, BESIDES THE VARIOUS BUFFERS AND ALKALI GOLD CYANIDE, COMPLEX AA THIO SULFATE IS ADDED TO FACILITATE THE PROPER INCLUSION OF ARSENIC IN THE GOLD DEPOSIT, SALT COMPOSITION SUITABLE FOR OBTAINING AQUEOUS ELECTROLYTES, A MEHTOD FOR DEPOSITING THE ARSENIC GOLD, TE GOLD ALLOY, AND ELECTRICAL DEVICES HAVING THE ARSENIC GOLD DEPOSIT ON A SURFACE OF THESE DEVICES HAVE ALSO BEEN DISCLOSED.
摘要:
Alkaline gold cyanide electrolyte solutions to be employed for depositing gold alloys by an electroplating process, such solutions having incorporated therein a mixture of an alkali metal silver cyanide and ethylenediaminotetraacetic acid and, optionally, alkali metal indium cyanide, processes of electroplating employing such solutions, and electroplated products produced thereby.
摘要:
A PROCESS AND PRODUCT FORMED BY ELECTROLYSIS OF AN AQUEOUS ACID GOLD BATH HAVING SOLUBLE THALLIUM SALT THEREIN FOR UNIFORM, SMOOTH DEPOSITION OF PURE GOLD.