摘要:
A method for stabilizing organic metal finishing additives in aqueous metal treating baths by dissolving the organic metal finishing additive with a cyclodextrin and a common solvent therefor, so that an inclusion compound of the organic metal finishing additive in the cyclodextrin is formed, and then dissolving the inclusion compound in an aqueous metal treating bath. Aqueous metal treating baths having dissolved therein inclusion compounds of organic metal finishing additives in cyclodextrins are also described.
摘要:
A method for plating tin onto the surface of steel strip in an acidic electrolyte bath utilizing insoluble anodes is disclosed. Free acid in the bath is extracted from the bath and concentrated. Tin is dissolved in the concentrated extract and the extract is returned to the bath to replenish the tin in the bath.
摘要:
The method for the manufacture of printed circuit boards which have been imaged by means of a polymeric resist which comprises selectively catalyzing those areas not covered by the image by treating the imaged circuit board with a catalyst having a charge higher than the charge on the non-imaged areas and sufficiently lower than the charge on the resist image to cause the catalyst to be repelled therefrom, but sufficiently close to the charge on the non-imaged areas to cause adsorption of the catalysts thereon.
摘要:
The method for the manufacture of printed circuit boards which have been imaged by means of a polymeric resist which comprises selectively catalyzing those areas not covered by the image by treating the imaged circuit board with a catalyst having a charge higher than the charge on the non-imaged areas and sufficiently lower than the charge on the resist image to cause the catalyst to be repelled therefrom, but sufficiently close to the charge on the non-imaged areas to cause adsorption of the catalysts thereon.
摘要:
An electroplating bath and process for electroplating substrates with a tin-lead alloy from an electrolyte containing a soluble tin compound, a soluble lead compound and a complexing agent in an amount sufficient to maintain the metals in solution. Th electrolyte has a pH range of about 1.5 to 5.5 and is free from substantial amounts of free acid or free base components.
摘要:
A simple and highly effective process for preparing the surface and plating a plastic or elastomer material is disclosed by the present invention.A uniform, highly adherent metal layer is deposited by the claimed process. The surface of the materials to be plated is prepared by exposure to a gas etch atmosphere and activation of the etched surface by providing a metal colloid thereon. Another aspect relates to the use of a one-step or two-step conditioner treatment in the process for improved results.After the surface preparation and activation, a desired metal coating can be electroless metal plated in a conventional manner.
摘要:
The invention relates to silver plating utilizing low cyanide or non-cyanide silver plating baths by treating the substrate to be plated with a mercaptan and to low cyanide or non-cyanide baths containing a bath soluble mercaptan in a sufficient amount to eliminate or effectively reduce immersion plating of the silver onto the substrate.
摘要:
The invention relates to silver plating utilizing low cyanide or non-cyanide silver plating baths by treating the substrate to be plated with a mercaptan and to low cyanide or non-cyanide baths containing a bath soluble mercaptan in a sufficient amount to eliminate or effectively reduce immersion plating of the silver onto the substrate.
摘要:
Methods for preparing hypophosphorous acid are disclosed comprising contacting an insoluble anode with an aqueous solution of hypophosphite anions and applying a current through the insoluble anode to a cathode in electrical contact with the aqueous solution to generate H+ ions in the aqueous solution thereby forming a hypophosphorous acid solution.
摘要:
A solution for electroplating gold-copper-silver alloys. The solution comprises gold, copper and silver, each in the form of a cyanide complex. The solution further comprises a divalent sulfur compound capable of brightening and leveling the electroplated deposit of the gold-copper-silver alloy. Optionally, a source of cyanide ions such as a free alkali cyanide, is included in the solution. In addition, additives such as surface active agents, buffers and/or conductivity salts may also be included to impart a particular feature or characteristic to the solution. The invention additionally comprises a process for electroplating up to about 20 microns of a gold-copper-silver alloy upon a substrate utilizing these novel solutions. The alloy is deposited upon a substrate which is immersed in the solution, by electroplating at a current density of between about 1 and 15 ASF, a pH of between about 8-11 at a temperature of between about 100.degree.-170.degree. F. for a time sufficient to obtain the desired thickness. Improved brightness results are obtained with the process of the invention by manipulating the electroplating current.