Compounded main brightener for preparing zinc-plating brightener

Abstract

The invention discloses a compounded main brightener for preparing a zinc-plating brightener, which comprises the following components in percent by weight: 59-61 percent of salicylic aldehyde, 24-26 percent of formaldehyde and 14-16 percent of 2,4-dichlorobenzaldehyde. The method comprises the following steps of: preparing the components according to the proportion; adding the components into a reaction kettle, and mixing and stirring uniformly; adding alkali liquid with the content of 50 percent according to the proportion of 350-400ml / L; regulating a pH value to 6.3-6.7; heating to 75-85 DEG C; keeping the temperature for 3-4 hours; reducing the temperature to the room temperature and filtering by using a piece of filtering cloth; adding the filtered precipitate material into a drying machine for drying; and adding the filtered precipitate material into a dryer for drying to obtain a finished product. The finished product and a high-temperature carrier are prepared into compounded brightener for sylvite zinc plating, and the compounded main brightener has the advantages of quick polishing, no oxidation, good galvanization and high cladding brightness and is stable and durable without color changing.

Description

technical field [0001] The invention relates to metal electroplating and galvanizing, in particular to a brightener for potassium salt galvanizing. Background technique [0002] Since potassium salt galvanizing in the domestic electroplating industry used benzylidene acetone as the main brightener compound brightener in the 1980s, there has always been the problem of easy discoloration of the galvanized layer. Chlorobenzaldehyde is replaced by the compound brightener made of o-chlorobenzaldehyde as the main brightener. Benzaldehyde will be oxidized to o-chlorobenzoic acid during the electroplating process, resulting in no bright effect of the coating. Therefore, it is necessary to continuously add brighteners during the galvanizing process to achieve the bright effect. The oxidation of o-chlorobenzaldehyde, the main brightener in the brightener, affects the galvanizing effect, which has been puzzling people so far and needs to be improved and solved urgently. Contents of ...

AI Technical Summary

Problems solved by technology

[0002] Since potassium salt galvanizing in the domestic electroplating industry used benzylidene acetone as the main brightener compound brightener in the 1980s, there has always been the problem of easy discoloration of the galvanized layer. Chlorobenzaldehyde is replaced by the compound brightener made of o-chlorobenzaldehyde as the main brightener. Benzaldehyde will be oxidized to o-chlorobenzoic acid during the electroplating process, resulting in no bright effect of the coating, so it is necessary to continuously add brighteners during the galvanizing process to achieve a bright effect