Potassium chloride acidic galvanizing electroplating solution and application thereof

Abstract

The invention relates to a potassium chloride acidic galvanizing electroplating solution. The potassium chloride acidic galvanizing electroplating solution contains 120 to 150 g/L of KCl, 30 to 40 g/Lof ZnCl2, 25 to 30 g/L of H3BO3, 0.1 to 0.5 mL/L of a brightening agent, 20 to 30 mL/L of a softening agent and 6 to 12 mL/L of an auxiliary agent; in the brightening agent, Guerbet alcohol polyoxyethylene ether halogenated propanesulfonate accounts for 20 wt.%-30 wt.%, and benzalacetone accounts for 10 wt.%-25 wt.%; and the softening agent contains 5 wt.%-10 wt.% of 2,2', 4'-trihydroxy chalcone,10 wt.%-20 wt.% of beta-naphthol polyether sulfonate, 1 wt.%-3 wt.% of nicotinoylurea derivatives, 5 wt.%-10 wt.% of EN 16-80 and 1 wt.%-3 wt.% of sodium benzoate. According to the potassium chlorideacidic galvanizing electroplating solution, the concentrations of main salt and conducting salt in the electroplating solution are greatly reduced, the concentration of chloride ions in wastewater isgreatly reduced, the characteristics of high current efficiency, wide current density range, fine crystallization, excellent dispersion and the like of a traditional potassium salt galvanizing process can still be kept, and excellent leveling and moving performance is shown; and the electroplating solution has the advantages of being low in consumption of the main salt and the conductive salt, saving raw material cost, preventing bath voltage from being increased during electroplating under the same current and avoiding additional increase of the energy expenditure, thereby being suitable forrack plating and barrel plating.

Description

technical field [0001] The invention belongs to the field of metal corrosion protection and surface treatment, and in particular relates to a potassium chloride acidic galvanizing electroplating solution and application thereof. Background technique [0002] With the sharp increase in demand for water resources, water pollution is becoming more and more serious, and people are paying more and more attention to water pollution treatment technology. The removal technology of COD, BOD, nitrogen, phosphorus, heavy metals and other pollutants has been greatly improved. However, in actual production, the content of chloride ions in electroplating wastewater, especially chloride galvanizing wastewater, is the most difficult problem to solve. Since chloride ions in electroplating wastewater are not used by microorganisms, there are relatively few removal technologies , A large amount of chloride enters the environment, which will cause serious harm to the environment and organisms. ...

AI Technical Summary

Problems solved by technology

And if want to reduce the content of chloride ion in the potassium chloride galvanizing waste water, must reduce the total chlorine of the chloride ion content in the electroplating bath namely potassium chloride and zinc chloride, but after reducing the chloride ion concentration, can cause plating bath The dispersing ability is obviously reduced, and it will also cause failures such as low current efficiency, poor conductivity, dark coating, and blackening of the low area, and there will be problems such as voltage increase and energy consumption under the same electroplating current conditions, and the reduction of chloride consumption, but increases the expenditure of electric energy, the loss outweighs the gain

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