A kind of smokeless plating flux and application method thereof

Abstract

The invention relates to smog-free promotion flux. The smog-free promotion flux comprises the following components in percentage by weight: 20-50% of zinc chloride, 2-10% of alkali chloride, 0-2% of fluoride, 0.1-5% of active element compound, 1-5% of control clad layer structure compound, 0.5-5% of rare earth chloride and the balance of water. An application method of the smog-free promotion flux comprises the following steps: (1) preparing the promotion flux, wherein the temperature of the obtained promotion flux is 60-80 DEG C, the pH value of the promotion flux is 3-6, and the total concentration of the promotion flux is not lower than 20%; (2) removing oil and rust on a steel part, washing with water, and then directly soaking in the promotion flux obtained in the step (1) for 2-10 minutes so as to carry out plating assistance; and (3) drying the steel part subjected to plating assistance in the step (2) till water flow marks do not exist on the surface of the steel part. The smog-free promotion flux is true smog-free promotion flux and can be used for completely eliminating the pollution of hot galvanizing smog to atmospheric environments; and the application method is simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a smoke-free plating flux in the hot-dip galvanizing process of iron and steel parts and an application method thereof. Background technique [0002] Hot-dip galvanizing coating flux is a very critical process. After the steel parts are coated with a layer of fluxing solvent, the surface of the steel base is "activated", allowing the zinc liquid to "wet" the surface of the steel base and react during dipping. Coated with a qualified zinc layer. At present, the hot-dip galvanizing production of steel parts mostly adopts dry hot-dip galvanizing, that is, the auxiliary plating treatment uses aqueous solution auxiliary plating agent, and hot-dip galvanizing is carried out after drying. The plating flux used is generally prepared with ammonium chloride and zinc chloride double salt. Zinc chloride mainly prevents the surface of iron parts from being oxidized twice duri...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a smoke-free plating flux and its application method. The flux is a real smoke-free plating flux, which can completely eliminate the pollution of the hot-dip galvanizing smoke to the atmospheric environment, and the application method is simple and easy to operate. , to overcome the problems of smoke treatment and other problems existing in hot-dip galvanizing of steel parts