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Aqueous, alkaline, cyanide-free bath for the galvanic deposition of zinc alloy coatings

a zinc alloy coating and cyanide-free technology, applied in the field of aqueous alkaline galvanic baths, can solve the problems of strong corrosive effect of electrolyte on the electroplating equipment, uniform layer or uniform brightness is often not achieved across the entire range of current densities, and strong hydrogen evolution

Inactive Publication Date: 2010-06-24
ATOTECH DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in view of demands for higher quality and comprehensive warranties, car manufacturers as well as their suppliers have had to develop new coatings systems.
A disadvantage of such acidic baths is the strong corrosive effect which the electrolyte has on the electroplating equipment.
All baths for metal deposition known in the prior art exhibit the problem that a uniform layer or a uniform brightness is frequently not achieved across the entire range of current densities.
Moreover, commercially available galvanic baths for depositing zinc / nickel alloy layers often show only moderate cathodic current efficiency resulting in strong evolution of hydrogen.

Method used

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  • Aqueous, alkaline, cyanide-free bath for the galvanic deposition of zinc alloy coatings
  • Aqueous, alkaline, cyanide-free bath for the galvanic deposition of zinc alloy coatings
  • Aqueous, alkaline, cyanide-free bath for the galvanic deposition of zinc alloy coatings

Examples

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preparation example 1

Synthesis of 1-(4′-methoxy-benzyl)-3-carbamoyl-pyridinium-chloride

[0063]In a 100 ml round-bottom flask with reflux condenser, 60 ml of water, 9.2 g of nicotinic acid amide (98%) (0.0738 mol), 11.68 g of 4-methoxybenzylchloride (99%) (0.07378 mol) are heated under reflux for 24 hours. After completion of the reaction, the water is removed in vacuo and the residue is taken up in 200 ml of ethanol and heated under reflux for another hour. The reaction mixture is then cooled to 4° C. and the white solid obtained is removed by filtration and dried in vacuo. This yielded 16.92 g of a white solid (82.26% of the theoretical yield).

preparation example 2

Synthesis of 1-(4′-chloro-benzyl)-3-carbamoyl-pyridinium-chloride

[0064]In a 100 ml round-bottom flask with reflux condenser, 60 ml of ethanol, 10 g of nicotinic acid amide (98%) (0.0802 mol), 13.05 g of 4-chloro-benzylchloride (99%) (0.0802 mol) are heated under reflux for 24 hours. After completion of the reaction, the solid residue is heated in an ethanol / methanol mixture for another 15 minutes and then cooled to 4° C. The solid obtained is removed by filtration and dried in vacuo. This yielded 18.82 g of a white solid (82.87% of the theoretical yield).

preparation example 3

Synthesis of 1-(4′-carboxy-benzyl)-3-carbamoyl-pyridinium-chloride

[0065]In a 100 ml round-bottom flask with reflux condenser, 60 ml of ethanol, 7.09 g of nicotinic acid amide (98%) (0.0569 mol), 10.22 g of 4-chloro-benzoic acid (95%) (0.0569 mol) are heated under reflux for 24 hours. After completion of the reaction, the reaction mixture is cooled to 4° C., the resulting solid is removed by filtration and dried in vacuo. This yielded 13.21 g of a white solid (79.21% of the theoretical yield).

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Abstract

An aqueous, alkaline, cyanide-free electrolyte bath for deposition of zinc alloy layers on substrate surfaces is described, which contains cationic pyridinium compounds as brighteners and polyamines as complexing agents. The electrolyte bath is suitable for electroplating bright and even zinc alloy coatings.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an aqueous, alkaline galvanic bath without addition of cyanide ions as complexing agents for the deposition of zinc alloy coatings, in particular, zinc / nickel, zinc / iron and zinc / cobalt coatings which contains, as additives, cationic, heteroaromatic nitrogen compounds, as well as to a process for the deposition of bright and smooth zinc alloy coatings, wherein the bath is used.BACKGROUND OF THE INVENTION[0002]Zinc deposition from cyanide-containing alkaline solutions has been dominating the industrial market for many years. However, increasingly stringent statutory requirements regarding the disposal of used zinc and zinc alloy electrolyte baths and the consequent strict control regarding waste water have resulted in increased interest in cyanide-free zinc and zinc alloy baths. In this connection, zinc alloy electrolytes are of particular interest.[0003]Such metal coatings are used for improving corrosion properties and fo...

Claims

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Application Information

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IPC IPC(8): C25D3/56
CPCC07D213/82C25D3/565C25D3/22
Inventor BRUNNER, HEIKOKOHLMANN, LARSVOGEL, ROLANDTHOM, KONSTANTIN
Owner ATOTECH DEUT GMBH
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