Ammonia-free acid zinc plating bath

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 3/22 (2006.01)

Patent

CA 1113420

Applicants: William E. Eckles and Valerie Canaris Title: AMMONIA-FREE ACID ZINC PLATING BATH ABSTRACT OF THE DISCLOSURE The present invention provides an ammonia-free acid zinc plating bath for electrodepositing bright zinc on a substrate in which the zinc deposit produced thereby is ductile and presents a glossy to bright coating on the substrate over a wide cathodic current density range. The ammonia-free acid zinc plating baths of the invention comprise zinc ions, chloride ions, at least one polyoxyalkylated naphthol, at least one aromatic carboxylic acid or bath-soluble salt thereof, and at least one anionic aromatic sulfonic acid or bath-soluble salt thereof. In addition to the above components, the ammonia-free acid zinc plating baths of the invention may contain at least one nonionic polyoxyethylene compound and at least one aromatic aldehyde, ketone, or mixtures thereof. The ammonia-free acid zinc plating baths of the invention are free from significant amounts of complexing agents that would impede the removal of zinc ions from the baths prior to disposal.

291054

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