Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1995-03-02
1997-08-12
Bell, Bruce F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
205313, 205244, C25D 322
Patent
active
056561482
ABSTRACT:
An electrogalvanizing process and composition are disclosed for reducing high current density dendrite (HCD) formation and edge burn and controlling high current density roughness, grain size and orientation of a zinc coating obtained from a zinc halide aqueous acidic electrogalvanic coating bath. A low molecular weight polyoxyalkylene glycol homopolymer or copolymer based on 3 to about 4 carbon atom alkylene oxides as a grain refining agent in combination with a sulfonated condensation product of naphthalene and formaldehyde which is used as an antidendritic agent. A glycol compound comprising a high molecular weight polyoxyalkylene glycol homopolymer or copolymer, a depolarizer such as an aniline compound, and a carbamate compound comprising a di-lower alkyl dithio carbamyl lower alkyl sulfonic acid may also be used, optionally in combination with an aldehyde and/or a grain refining agent such as a low molecular weight polyoxyalkylene glycol homopolymer or copolymer and/or an antidendritic agent comprising a sulfonated condensation product of naphthalene and formaldehyde. HCD zinc coatings applied according to the process described herein will be smoother when using a sulfonated naphthalene formaldehyde antidendritic agent and a low molecular weight ethylene oxide polymer grain refining agent by increasing the antidendritic agent to an amount greater than the grain refining agent. A boron oxide composition can be used to further reduce HCD burn and a lignin compound to increase brightness.
REFERENCES:
patent: 2849351 (1958-08-01), Gundel et al.
patent: 3957595 (1976-05-01), DuBrow et al.
patent: 3960677 (1976-06-01), Hildering et al.
patent: 4119502 (1978-10-01), Arcilesi
patent: 4137133 (1979-01-01), Arcilesi
patent: 4229268 (1980-10-01), Lowery et al.
patent: 4379738 (1983-04-01), Kohl
patent: 4512856 (1985-04-01), Paneccasio
patent: 4515663 (1985-05-01), Strom et al.
patent: 4581110 (1986-04-01), Tsuchida et al.
patent: 4797183 (1989-01-01), Yamamoto et al.
patent: 4877497 (1989-10-01), Watanabe et al.
patent: 5200057 (1993-04-01), Canaris
Martyak Nicholas M.
McCaskie John E.
Atotech USA, Inc.
Bell Bruce F.
Mayekar Kishor
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