Technology for hot-dip galvanizing of steel tube

Abstract

The invention discloses a technology for hot-dip galvanizing of a steel tube. The technology comprises the steps of (1) degreasing, (2) acid pickling, (3) galvanizing and (4) post-processing. The galvanizing technology disclosed by the invention has the advantages that the steel tube is cleaned and then treated with pre-galvanizing and hot-dip galvanizing successively, so the surface of the steeltube can be activated and adhesion of a zinc layer on the steel tube surface can be enhanced; and the steel tube is cooled by air blowing and water cooling successively, so the galvanized surface is uniform, the galvanizing effect is good and a color difference can be reduced.

Description

technical field

[0001] The invention relates to a process for hot-dip galvanizing of steel pipes, belonging to the technical field of steel pipe processing. 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. In the existing hot-dip galvanizing process, the adhesion of the plating solution on the workpiece is poor, the thickness of the zinc layer is difficult to meet the standard, the pass rate of the workpiece is high, rework or multiple processing is often required, and the efficiency is low. And after the plating solution is attached to the workpiece, the uniformity is not high, the surface of the workpiece is prone to color difference, and it is also very easy to form a dark gray coating.

[0003] At the same time, in order to further improve the anti-corrosion performance of the hot-dip galvanized steel pipe, the surface passivation tre...