Columbia Chemical Corporation

R. O. Hull & Company, Inc.

William E Rosenberg

William E Eckles

Robert J Ludwig

An aqueous alkaline non-cyanide zinc electroplating bath containing zinc ions for producing bright electrodeposits of zinc and a brightening agent comprising a polymeric quaternary amine and a reducing sugar, and a compound that forms a reducing sugar upon hydrolysis.

Brightener additive and bath for alkaline cyanide-free zinc electroplating

A tin brightener for an electroplating bath contains various trialkoxybenzaldehydes for producing uniform desposits over a very broad current density range.

Aqueous acid plating bath and brightener composition for producing

A tin brightener composition and plating bath utilizes a disubstituted naphthalene having at least one substituted aldehyde group thereon.

A tin brightener mixture for plating baths comprises chlorinated acetophenones, emulsifying agents, and acrylic or methacrylic acid. Additionally, aromatic aldehydes can be utilized. The tin brightener yields semibright to bright deposits from 0 to over 150 amps per square foot.

Aqueous acid plating bath and brightener mixture for producing

A brightening agent is provided for the electrodeposition of zinc from an aqueous acid plating bath. The brightening agent is composed of an alpha-amino aliphatic carboxylic acid, a nonionic surface active compound and a carbonyl compound. The brightening agent may be added to an electroplating bath containing zinc ions, chloride ions, and boric acid. The use of the brightening agent eliminates the use of ammonium chloride as a bath constituent, and unexpectedly produces bright electrodeposits at extremely high current densities.

Baths and additives for the electroplating of bright zinc

A zinc brightener additive compises a polymeric amine selected from the class consisting of a linear aliphatic amine polymer, an aminated polyepichlorohydrin, a polyethylenimine, and combinations thereof, a propylene oxide-ethylene oxide block copolymer prepared by the sequential addition of propylenene oxide followed by ethylene oxide, or vice versa, to a residue of an organic compound containing active hydrogen atoms such as propylene glycol or an amine base, and an aliphatic ketone. Additionally, an aqueous acid electroplating bath containing the polymeric amine compound in combination with the propylene oxide-ethylene oxide block copolymer and an aliphatic ketone provides bright, lustous electrodepositions of zinc.

Electrodeposition of bright zinc utilizing aliphatic ketones

An aqueous acid tin electroplating bath contains as a brightening agent certain dialkoxy benzaldehydes, an emulsifying agent, as well as alpha, beta unsaturated carboxylic acids, amides, and esters to give extremely bright electrodeposits.

Aqueous acid plating bath and additives for producing bright

An aqueous acid tin electroplating bath contains as a brightening agent compounds having the formula: ##STR1## where O is oxygen and A is selected from the class consisting of hydrogen, hydroxy alkyl, polyalkoxy, and 3-sulfopropyl, certain emulsifying agents and certain synergistically acting carboxylic acids, amides and esters to give extremely bright electrodeposits.

Acidic plating bath and additives for electrodeposition of bright tin

A zinc brightener additive comprises a polymeric amine selected from the class consisting of a linear aliphatic amine polymer, an aminated polyepichlorohydrin, a polyethylenimine, and combinations thereof, and a propylene oxide-ethylene oxide block copolymer prepared by the sequential addition of propylene oxide followed by ethylene oxide, or vice versa, to a residue of an organic compound containing active hydrogen atoms such as propylene glycol or an amine base. Additionally, an aqueous acid electroplating bath containing the polymeric amine compound in combination with the propylene oxide-ethylene oxide and block copolymer provides bright, lustrous electrodepositions of zinc. Moreover, aromatic aldehydes and ketones may be utilized to provide extremely bright electrodepositions of zinc.

Baths and additives for the electrodeposition of bright zinc

It has been found that a linear aliphatic amine polymer obtained from the reaction of a linear aliphatic polyamine and an epihalohydrin results in an acid zinc electroplating bath brightener. Additionally, when dissolved in an aqueous, acid zinc electroplating bath, the linear aliphatic amine polymer reaction product acts synergistically with polyoxyethylene condensates and aromatic aldehydes and ketones to provide extremely bright electrodeposits of zinc.

It has been found that aminated polyepichlorohydrins prepared by reacting polyepichlorohydrin with an amine selected from the group consisting of secondary aliphatic amines and secondary alicyclic amines result in a zinc electroplating bath brightener. Additionally, an aqueous, acid electroplating bath containing the aminated polyepichlorohydrin as well as polyoxyethylene condensates, and aromatic aldehydes and ketones act synergistically to provide bright, lustrous electrodeposits of zinc.

An aqueous acid tin electroplating bath contains as a brightening agent an alkoxy naphthalene carboxaldehyde, certain emulsifying agents and certain synergistically acting carboxylic acids, amides, and esters to give extremely bright electrodeposits.

The invention disclosed herein relates to the electrolytic deposition of bright tin and tin-lead alloy. This invention is embodied in a new plating bath and a plating bath additive. The new plating bath includes tin or tin and lead ions, sulfuric acid or fluoboric acid, and the new additive. The new additive includes an emulsified naphthalene monocarboxaldehyde with or without a substituted olefin, having the general formula: ##EQU1## in which R.sub.1 is carboxy, carboxamido, alkali carboxylate, ammonium carboxylate, amine carboxylate, or alkyl carboxylate, and R.sub.2, R.sub.3, and R.sub.4 are hydrogen, methyl, or lower alkyl.

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Strongsville, OH, United States of America

William E Rosenberg