Hot dip galvanizing process

Abstract

The invention provides a hot-dip galvanizing process, the process steps of which are black parts stacking, pickling, water washing, plating aid, drying, galvanizing, air blowing, cooling, finishing, packaging, passivation, rinsing, and storage. The hydrochloric acid inhibitor is added in the pickling solution, and the hydrochloric acid inhibitor adopts a fog-suppressing corrosion inhibitor, the pickling speed is fast, and the rust removal quality is good, which avoids the phenomenon of over-pickling, can suppress the generation of acid mist, and can improve The labor environment reduces the overall production cost of the enterprise.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a galvanizing process. Background technique [0002] Hot-dip galvanizing is to make the molten metal react with the iron substrate to produce an alloy layer, so that the substrate and the coating are combined. Hot-dip galvanizing is to pickle the steel parts first, in order to remove the surface of the steel parts Iron oxide, after pickling, is soaked in ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride to form a salt-assisted plating film, and then sent to a hot-dip galvanizing pot. Hot-dip galvanizing has Uniform coating, strong adhesion, long service life, etc. However, under the current technical conditions, the composition of the pickling solution is obtained by diluting industrial hydrochloric acid with a concentration of about 32% to about 17% with water, because hydrochloric acid reacts violently with ir...

AI Technical Summary

Problems solved by technology

[0002] Hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the steel parts first, in order to remove the surface of the steel parts Iron oxide, after pickling, is soaked in ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride to form a salt-assisted coating film, and then sent to a hot-dip galvanizing pot. Hot-dip galvanizing has Uniform coating, strong adhesion, long service life, etc. However, under the current technical conditions, the composition of the pickling solution is obtained by diluting industrial hydrochloric acid with a concentration of about 32% to about 17% with water, because hydrochloric acid reacts violently with iron , if the pickling time is not well grasped, it is easy to cause the black parts to be pickled, the loss of black parts is large, and a large amount of hydrochloric acid is also consumed, which increases the production cost