Novel acidic zinc-plating additive

Abstract

The invention discloses a novel acidic zinc-plating additive. The additive comprises the following components of, in percentage by weight, 25%-35% of fatty alcohol-polyoxyethylene ether sulphonate, 8%-12% of octyl phenol polyoxyethylene ether; 3%-8% of fatty alcohol-polyoxyethylene ether block copolymer, 0.2%-0.8% of benzyl fork acetone, 0.2%-0.8% of o-chlorobenzaldehyde, 2%-7% of high-purity diffusant NNO, 2%-7% of sodium benzoate, 0.8%-1.2% of nicotinic acid, 0.8%-1.2% of cinnamic acid and the balance pure water. According to the additive, a zinc-plated layer with good brightness, leveling and ductility can be rapidly obtained in acid zinc-plating; the cloud point is high, the temperature resistance is good, the current efficiency is high, the light emitting speed is fast, throwing is good, the efficiency is high, and the zinc-plated layer is suitable for rolling plating and hanging plating; the zinc-plated layer is compact in crystallization, non-brittle of zinc and free of foaming,various blue-white and colorful passivation treatment can be easily accepted, and the corrosion-resistant performance is excellent; and the consumption of the additive is less in the plating liquid,supplement and maintenance are convenient, and the additive is economical and practical.

Description

technical field [0001] The invention relates to the technical field of galvanized surface treatment, more specifically, it relates to a novel acidic galvanized additive. Background technique [0002] In electroplating production, in order to obtain a mirror-bright coating and reduce the manual labor of heavy mechanical polishing, organic additives have been used for bright electroplating since the 1950s. Up to now, organic brighteners have been used in electroplating solutions that have the ability to level and obtain bright coatings. It can be said that without organic brighteners, there would be no modern bright electroplating. It can be seen that organic additives play an important role in the electroplating process. [0003] The composition of the compound combination brightener is relatively complex, and the functions of each component are not the same. Organic matter is adsorbed on the metal / solution interface, or changes the potential distribution and Ji potential v...

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Problems solved by technology

[0004] The acid potassium salt galvanizing process has been rapidly developed in the field of electro-galvanizing industry in my country since the 1980s. This process has the advantages of fast bath flow rate, simple bath composition, and easy sewage treatment. However, galvanizing in acid bath, There are problems of poor throwing ability, low current efficiency, brittleness and poor ductility of the coating, and the problem that the acidic plating solution is corrosive to the equipment

[0005] 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 problems of low temperature range and low current efficiency in galvanizing in acid plating solution; a zinc and zinc-iron alloy electroplating brightener (application number CN200710065899.5), which is mainly used as an additive for electroplating zinc and zinc-iron alloys on the surface of steel parts. Electroplating brightener is an aqueous solution composed of benzylidene acetone, surfactants (including non-ionic surfactants and ionic surfactants), condensation products of higher fatty alcohols and ethylene oxide, ethanol and water, non-ionic 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 The temperature range of the brightener is narrow, and it has no slowing effect on the acid bath, and the current efficiency is low

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