Phytate plating resisting agent for heat zinc coating

Abstract

The invention relates to a phytate fluxing agent for hot-dip galvanizing, which contains the following ingredients in weight percent: 8%-12% of zinc phytate, 2%-6% of borax, 13%-17% of sodium fluoride, citric acid 2%-7%. Oxalic acid 35%-25%, hydrazine hydrochloride 40%-33%. When hot-dip galvanizing with phytate flux: pre-coated parts are pickled, washed with water after rust removal; the solid phytate flux with the above components is diluted with water, and the ratio is phytate flux: water = 1: 2.5-4, put it in the pool; soak the pre-coated parts in the pool for 50-60 seconds, the working temperature is 40-50 °C; the temperature of the pre-coated parts is 35 °C-40 °C; place it indoors for 10-20 minutes dry. Its advantages: the production process of the flux is simple, the passivation film formed on the pre-plated parts is thin, it can be dried naturally, saves energy, avoids a large amount of dense smoke, splashing and missing plating, protects the environment, and is beneficial to human health. High quality and low cost.

Description

technical field [0001] The invention belongs to a solvent-based hot-dip galvanizing method, in particular to a phytate fluxing agent for hot-dip galvanizing. Background technique [0002] It is well known that when zinc chloride and ammonium chloride are mostly used as fluxes for hot-dip galvanizing of steel products, some areas on the surface are not covered or are not covered enough and black spots appear. In addition, the fluxes used The plated parts cannot be dried naturally and must be heated and dried (above 200°C). After drying, a dry solvent layer will be formed on the surface of the plated parts. Severe splashing, a large amount of ferrous iron in the flux is brought into the zinc pot to react with the zinc liquid to produce a large amount of zinc slag, which seriously pollutes the environment and increases the cost. Contents of the invention [0003] In order to solve the technical problems existing in the known technology, the present invention provides a plant...

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Problems solved by technology

[0002] It is well known that when zinc chloride and ammonium chloride are mostly used as fluxes for hot-dip galvanizing of steel products, some areas on the surface are not covered or are not covered enough and black spots appear. In addition, the fluxes used The plated parts cannot be dried naturally and must be heated and dried (above 200°C). After drying, a dry solvent layer will be formed on the surface of the plated parts. Severe splashing, a large amount of ferrous iron in the flux is brought into the zinc pot to react with the zinc liquid to produce a large amount of zinc slag, which seriously pollutes the environment and increases the cost

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