Title: Method for brightening the electrodeposits of zinc from alkaline zinc electroplating baths

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Claims: What is claimed as new and intended to be covered by Letters Patent is:

1. A method for the electrodeposition of bright zinc which comprises electrodepositing zinc from an aqueous alkaline zinc electroplating bath comprising a water soluble compound prepared by reacting an imidazole compound which is imidazole and/or at least one substituted imidazole with at least one organic compound selected from the group consisting of monochloroacetic acid, benzyl chloride, chloroacetamide, 3-aminobenzyl chloride, dichloroglycerine, methyl iodide, allyl chloride, dichloroethane, and monochloropropane, which quaternizes nitrogen in said imidazole compound in the presence of water.

2. The method of claim 1, wherein said substituted imidazole comprises at least one compound selected from the group consisting of 1-methylimidazole, 1-ethylimidazole, 2-methylimidazole, 1,5-dimethylimidazole, 1-ethyl-2-methylimidazole, 1-oxymethylimidazole and 1-vinylimidazole.

3. The method of claim 1, wherein the quaternizing agent is added to the imidazole compound in quantities ranging from 1 to 1.5 moles per mole of the imidazole.

4. The method of claim 1, wherein the imidazole compound is allowed to react with the quaternizing agent at from 40.degree. to 100.degree. C. for from 0.5 to 4 hours in the presence of such water quantities that the reaction products are dissolved.

5. The method of claim 1, wherein the imidazole compound is imidazole and the electroplating bath is a zincate or cyanide bath.

6. The method of claim 1, wherein the imidazole compound is 1-ethylimidazole and the electroplating bath is a zincate bath.
Other info:

Inventors: Oshima, Kathuhide (Tokyo, JP)
Takasaki, Haruyuki (Ichihara, JP)
Takahashi, Akio (Kisarazu, JP)

Application Number: 779560
Filing Date: 1977-03-21
Publication_date: 1978-09-12
Assignee: Dipsol Chemical Company, Ltd. (Tokyo, JP)
Primary Class(es): 205/307 205/310
Other Classes:
US Patent Ref:

3318787	May, 1967	Rindt et al.	204/55.
3411996	Nov, 1968	Rushmere	204/50.
3730855	May, 1973	Poor et al.	204/55.
3787297	Jan, 1974	Beckwith et al.	204/55.
3954575	May, 1976	Yanagida et al.	204/55.
3974045	Aug, 1976	Takahashi et al.	204/55.
4045306	Aug, 1977	Senge et al.	204/55.

Other Refs: 1,496,742

Jul, 1969	DE

Primary Examiner: Kaplan, G. L.
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier