Acid electroplating galvanizing bath additive and its application method

Abstract

The invention discloses an additive for an acidic electro-galvanizing bath and an application method thereof. The components of the additive and their weight percentages are as follows: 10-90% of long-chain alkane benzene sulfonate or / and heterocyclic organic amine; 10 ~90% water or / and ethanol. This additive improves the brightness and flatness of the galvanized layer, and has good dispersion and coverage capabilities. Adding this additive to the acidic plating solution can obtain high temperature in a wide temperature range and a large current density range The surface performance of the electro-galvanized layer improves the throwing ability of the galvanizing process, and also reduces the corrosion of the acid bath to the electro-galvanized equipment; the additive of the present invention has the advantages of less dosage, high efficiency, non-toxic and odorless, and completely water-soluble , wide application range and other advantages; the application method of this additive is simple, directly add 50-1000ppm of this additive to the acidic electro-galvanizing bath for electro-galvanizing, and you can obtain electro-plating with good surface properties, small internal stress of the coating, and high corrosion resistance Zinc layer and short processing time.

Description

technical field [0001] The invention relates to electroplating technology, in particular to an acidic electroplating galvanizing bath additive and an application method thereof. Background technique [0002] The acid sulfate galvanizing process has developed rapidly in the field of electro-galvanizing industry in my country since the 1980s. This process has the advantages of fast bath flow rate, high current efficiency, simple bath composition and easy sewage treatment. Medium galvanizing has poor throwing ability; narrow temperature range, generally within 60°C; and acidic plating solution is corrosive to equipment. [0003] Generally, in electroplating production, the use of additives is very important to obtain a high-brightness, uniform and smooth galvanized layer. However, at present, the research and development and use of acidic electrolytic zinc additives are still in its infancy. In the existing acidic electroplating process, Almost no additives are used in the plat...

AI Technical Summary

Problems solved by technology

[0004] In the report on additives for electroplating galvanizing bath, a zinc and zinc-iron alloy brightener (application number: CN201110290891.5), the brightener is mainly used to prepare iron and steel parts, wire, strip, pipe surface rapid galvanizing and zinc Additives for iron alloys, its main components include: benzylidene acetone, sodium benzoate, fatty alcohol polyoxyethylene ether ammonium sulfate, nicotinic acid and sodium methylenebisturate sulfonate and other substances. The brightener has a narrow temperature range and is suitable for Acid plating solution has no slowing effect; a bright and corrosion-resistant zinc-iron alloy electroplating process (application number CN200910038328.1), this process adds complexing agent and ferrous ions to the zincate plating solution, and the zinc-iron alloy plating solution consists of: Zinc oxide, sodium hydroxide, triethanolamine, ferrous sulfate, the compound of dimethylamine and epichlorohydrin, ethylenediaminetetraacetic acid, vanillin, sodium dodecylsulfonate and zinc powder, this process cannot solve The problem of narrow temperature range and current density range in galvanizing in acid bath; a zinc and zinc-iron alloy electroplating brightener (application number CN200710065899.5), mainly used as an additive for electroplating zinc and zinc-iron alloys on the surface of steel parts, The electroplating brightener is an aqueous solution composed of benzylidene acetone, surfactants (including non-ionic surfactants and ionic surfactants), condensation products of higher aliphatic alcohols and ethylene oxide, ethanol and water. The surfactant is any one of nonylphenol polyoxyethylene ether, polyethylene glycol, and OP emulsifier, and the ionic surfactant is any one of sodium dodecylsulfonate and sodium lauryl sulfate. One, the temperature range of the brightener is narrow, and it has no slowing effect on the acid bath